toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Leroy, C.; Gril, E.; Si Ouali, L.; Coste, S.; Gérard, B.; Maillard, P.; Mercier, H.; Stahl, C. url  doi
openurl 
  Title Water and nutrient uptake capacity of leaf-absorbing trichomes vs. roots in epiphytic tank bromeliads Type Journal Article
  Year 2019 Publication Environmental and Experimental Botany Abbreviated Journal Environ. Exp. Bot.  
  Volume 163 Issue Pages 112-123  
  Keywords 15 N labelling; Carbon metabolism; Nutrient uptake; Plant performance; Tank bromeliad; Water status; Aechmea  
  Abstract The water and nutrient uptake mechanisms used by vascular epiphytes have been the subject of a few studies. While leaf absorbing trichomes (LATs) are the main organ involved in resource uptake by bromeliads, little attention has been paid to the absorbing role of epiphytic bromeliad roots. This study investigates the water and nutrient uptake capacity of LATs vs. roots in two epiphytic tank bromeliads Aechmea aquilega and Lutheria splendens. The tank and/or the roots of bromeliads were watered, or not watered at all, in different treatments. We show that LATs and roots have different functions in resource uptake in the two species, which we mainly attributed to dissimilarities in carbon acquisition and growth traits (e.g., photosynthesis, relative growth rate, non-structural carbohydrates, malate), to water relation traits (e.g., water and osmotic potentials, relative water content, hydrenchyma thickness) and nutrient uptake (e.g., 15 N-labelling). While the roots of A. aquilega did contribute to water and nutrient uptake, the roots of L. splendens were less important than the role played by the LATs in resource uptake. We also provide evidenced for a synergistic effect of combined watering of tank and root in the Bromelioideae species. These results call for a more complex interpretation of LATs vs. roots in resource uptake in bromeliads. © 2019 Elsevier B.V.  
  Address INRA, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00988472 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 871  
Permanent link to this record
 

 
Author Fu, Z.; Gerken, T.; Bromley, G.; Araújo, A.; Bonal, D.; Burban, B.; Ficklin, D.; Fuentes, J.D.; Goulden, M.; Hirano, T.; Kosugi, Y.; Liddell, M.; Nicolini, G.; Niu, S.; Roupsard, O.; Stefani, P.; Mi, C.; Tofte, Z.; Xiao, J.; Valentini, R.; Wolf, S.; Stoy, P.C. url  doi
openurl 
  Title The surface-atmosphere exchange of carbon dioxide in tropical rainforests: Sensitivity to environmental drivers and flux measurement methodology Type Journal Article
  Year 2018 Publication Agricultural and Forest Meteorology Abbreviated Journal Agric. For. Meterol.  
  Volume 263 Issue Pages 292-307  
  Keywords Climate variability; Ecosystem respiration; Eddy covariance; Gross primary productivity; Net ecosystem carbon dioxide exchange; Tropical rainforest; acclimation; air temperature; anthropogenic effect; atmosphere-biosphere interaction; biodiversity; carbon flux; climate change; Cmip; eddy covariance; environmental change; flux measurement; methodology; net ecosystem exchange; net ecosystem production; radiative forcing; rainforest; sensitivity analysis; tropical environment  
  Abstract Tropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP > 3000 g C m−2 y-1) have the lowest net carbon uptake – or even carbon losses – versus other study ecosystems because RE is of a similar magnitude. Sites that provided subcanopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87 μmol CO2 m−2 s-1 hPa-1. Climate projections from 13 general circulation models (CMIP5) under the representative concentration pathway that generates 8.5 W m−2 of radiative forcing suggest that many current tropical rainforest sites on the lower end of the current temperature range are likely to reach a climate space similar to present-day warmer sites by the year 2050, warmer sites will reach a climate not currently experienced, and all forests are likely to experience higher VPD. Results demonstrate the need to quantify if and how mature tropical trees acclimate to heat and water stress, and to further develop flux-partitioning and gap-filling algorithms for defensible estimates of carbon exchange in tropical rainforests. © 2018 Elsevier B.V.  
  Address Department of Environmental Systems Science, ETH Zurich, Zurich, 8092, Switzerland  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 01681923 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 12 November 2018; Coden: Afmee; Correspondence Address: Stoy, P.C.; Department of Land Resources and Environmental Sciences, Montana State UniversityUnited States; email: paul.stoy@montana.edu; Funding details: ANR-10-LABX-25-01; Funding details: U.S. Department of Energy, DOE, SC0011097; Funding details: Agence Nationale de la Recherche, ANR; Funding details: 1702029; Funding details: 1552976; Funding details: Graduate School, Ohio State University; Funding details: National Natural Science Foundation of China, NSFC, 31625006; Funding text 1: PCS and JDF acknowledges funding support from the U.S. Department of Energy as part of the GoAmazon project (Grant SC0011097 ). PCS additionally acknowledges the U.S. National Science Foundation grants 1552976 and 1702029 , and The Graduate School at Montana State University . ZF is supported by the China Scholarship Council and National Natural Science Foundation of China ( 31625006 ). This work used eddy covariance data acquired and shared by the FLUXNET community, including the AmeriFlux, AfriFlux, AsiaFlux, CarboAfrica, LBA, and TERN- OzFlux networks. The FLUXNET eddy covariance data processing and harmonization was carried out by the ICOS Ecosystem Thematic Center, AmeriFlux Management Project and Fluxdata project of FLUXNET, with the support of CDIAC, and the OzFlux, ChinaFlux and AsiaFlux offices. The Guyaflux program belongs to the SOERE F-ORE-T which is supported annually by Ecofor, Allenvi and the French national research infrastructure ANAEE-F. The Guyaflux program also received support from the “Observatoire du Carbone en Guyane” and an “investissement d'avenir” grant from the Agence Nationale de la Recherche (CEBA, ref ANR-10-LABX-25-01). Funding for the site PA-SPn was provided by the North-South Centre of ETH Zurich. We acknowledge the World Climate Research Programme's Working Group on Coupled Modeling for the CMIP and thank the climate modeling groups for producing and making available their model output. For CMIP, the U.S. Department of Energy's Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led development of software infrastructure in partnership with the Global Organization for Earth System Science Portals. Angela Tang and Taylor Rodenburg provided valuable comments to earlier drafts of this manuscript. We thank Dr. Tim Hill and two anonymous reviewers for their constructive comments on the manuscript.; References: Acevedo, O.C., Moraes, O.L.L., Degrazia, G.A., Fitzjarrald, D.R., Manzi, A.O., Campos, J.G., Is friction velocity the most appropriate scale for correcting nocturnal carbon dioxide fluxes? (2009) Agric. For. Meteorol., 149, pp. 1-10; Aguilos, M., Hérault, B., Burban, B., Wagner, F., Bonal, D., What drives long-term variations in carbon flux and balance in a tropical rainforest in French Guiana? Agric (2018) For. Meteorol., 253-254, pp. 114-123; Ahlström, A., Raupach, M.R., Schurgers, G., Smith, B., Arneth, A., Jung, M., Reichstein, M., Jain, A.K., The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink (2015) Science, 348 (80), pp. 895-899; Aiba, S.I., Kitayama, K., Structure, composition and species diversity in an altitude-substrate matrix of rain forest tree communities on Mount Kinabalu (1999) Borneo. Plant Ecol., 140, pp. 139-157; Andreae, M.O., Artaxo, P., Brandão, C., Carswell, F.E., Ciccioli, P., da Costa, A.L., Culf, A.D., Waterloo, M.J., Biogeochemical cycling of carbon, water, energy, trace gases, and aerosols in Amazonia: the LBA-EUSTACH experiments (2002) J. Geophys. Res., 107, p. 8066; Andreae, M.O., Acevedo, O.C., Araùjo, A., Artaxo, P., Barbosa, C.G.G., Barbosa, H.M.J., Brito, J., Yáñez-Serrano, A.M., The Amazon Tall Tower Observatory (ATTO): overview of pilot measurements on ecosystem ecology, meteorology, trace gases, and aerosols (2015) Atmos. Chem. Phys., 15, pp. 10723-10776; Araújo, A.C., Nobre, A.D., Kruijt, B., Elbers, J.A., Dallarosa, R., Stefani, P., Von Randow, C., Kabat, P., Comparative measurements of carbon dioxide fluxes from two nearby towers in a central Amazonian rainforest: The Manaus LBA site (2002) J. Geophys. Res., 107, p. 8090; Asner, G.P., Anderson, C.B., Martin, R.E., Tupayachi, R., Knapp, D.E., Sinca, F., Landscape biogeochemistry reflected in shifting distributions of chemical traits in the Amazon forest canopy (2015) Nat. Geosci., 8, pp. 567-573; Asner, G.P., Martin, R.E., Knapp, D.E., Tupayachi, R., Anderson, C.B., Sinca, F., Vaughn, N.R., Llactayo, W., Airborne laser-guided imaging spectroscopy to map forest trait diversity and guide conservation (2017) Science, 355 (80), pp. 385-389; Avissar, R., Werth, D., Global hydroclimatological teleconnections resulting from tropical deforestation (2005) J. Hydrometeorol., 6, pp. 134-145; Baccini, A., Walker, W., Carvalho, L., Farina, M., Sulla-Menashe, D., Houghton, R.A., Tropical forests are a net carbon source based on aboveground measurements of gain and loss (2017) Science, 358 (80), pp. 230-234; Belelli Marchesini, L., Bombelli, A., Chiti, T., Consalvo, C., Forgione, A., Grieco, E., Mazzenga, F., Valentini, R., Ankasa flux tower: a new research facility for the study of the carbon cycle in a primary tropical forest in Africa (2008) Proceedings of the Open Science Conference on Africa and Carbon Cycle: The CarboAfrica Project; Beringer, J., Hutley, L.B., McHugh, I., Arndt, S.K., Campbell, D., Cleugh, H.A., Cleverly, J., Wardlaw, T., An introduction to the Australian and New Zealand flux tower network – OzFlux (2016) Biogeosciences, 13, pp. 5895-5916; Bonal, D., Bosc, A., Ponton, S., Goret, J.-Y.J.Y., Burban, B.T., Gross, P., Bonnefond, J.M.J.-M., Granier, A., Impact of severe dry season on net ecosystem exchange in the Neotropical rainforest of French Guiana (2008) Glob. Chang. Biol., 14, pp. 1917-1933; Borma, L.S., da Rocha, H.R., Cabral, O.M., von Randow, C., Collicchio, E., Kurzatkowski, D., Brugger, P.J., Artaxo, P., Atmosphere and hydrological controls of the evapotranspiration over a floodplain forest in the Bananal Island region, Amazonia (2009) J. Geophys. Res. Biogeosci., 114; Bradford, M.G., Metcalfe, D.J., Ford, A., Liddell, M.J., McKeown, A., Floristics, stand structure and aboveground biomass of a 25-ha rainforest plot in the Wet Tropics of Australia (2014) J. Trop. For. Sci., pp. 543-553; Braga, N., da, S., Vitória, A.P., Souza, G.M., Barros, C.F., Freitas, L., Weak relationships between leaf phenology and isohydric and anisohydric behavior in lowland wet tropical forest trees (2016) Biotropica, 48, pp. 453-464; Carswell, F.E., Costa, A.L., Palheta, M., Malhi, Y., Meir, P., Costa, J.D.P.R., Ruivo, M.D.L., Grace, J., Seasonality in CO2 and H2O flux at an eastern Amazonian rain forest (2002) J. Geophys. Res. D Atmos., p. 107; Chambers, J.Q., Tribuzy, E.S., Toledo, L.C., Crispim, B.F., Higuchi, N., dos Santos, J., Araújo, A.C., Trumbore, S.E., Respiration from a tropical forest ecosystem: partitioning of sources and low carbon use efficiency (2004) Ecol. Appl., 14, pp. 72-88; Chambers, J., Davies, S., Koven, C., Kueppers, L., Leung, R., McDowell, N., Norby, R., Rogers, A., Next Generation Ecosystem Experiment (NGEE) Tropics. US DOE NGEE Trop. white paper. (2014); Chiti, T., Certini, G., Grieco, E., Valentini, R., The role of soil in storing carbon in tropical rainforests: the case of Ankasa Park, Ghana (2010) Plant Soil, 331, pp. 453-461; Cleveland, C.C., Wieder, W.R., Reed, S.C., Townsend, A.R., Experimental drought in a tropical rain forest increases soil carbon dioxide losses to the atmosphere (2010) Ecology, 91, pp. 2313-2323; Cleveland, C.C., Townsend, A.R., Taylor, P., Alvarez-Clare, S., Bustamante, M.M.C., Chuyong, G., Dobrowski, S.Z., Wieder, W.R., Relationships among net primary productivity, nutrients and climate in tropical rain forest: a pan-tropical analysis (2011) Ecol. Lett.; Cusack, D.F., Chou, W.W., Yang, W.H., Harmon, M.E., Silver, W.L., Controls on long-term root and leaf litter decomposition in neotropical forests (2009) Glob. Chang. Biol., 15, pp. 1339-1355; da Rocha, H.R., Manzi, A.O., Cabral, O.M., Miller, S.D., Goulden, M.L., Saleska, S.R., Coupe, N.R., Maia, J.F., Patterns of water and heat flux across a biome gradient from tropical forest to savanna in Brazil (2009) J. Geophys. Res. Biogeosci., 114. , G00B12; Dargie, G.C., Lewis, S.L., Lawson, I.T., Mitchard, E.T.A., Page, S.E., Bocko, Y.E., Ifo, S.A., Age, extent and carbon storage of the central Congo Basin peatland complex (2017) Nature, 542, pp. 86-89; de Araújo, A.C., Dolman, A.J., Waterloo, M.J., Gash, J.H.C., Kruijt, B., Zanchi, F.B., de Lange, J.M.E., Backer, J., The spatial variability of CO2 storage and the interpretation of eddy covariance fluxes in central Amazonia (2010) Agric. For. Meteorol., 150, pp. 226-237; Dixon, R.K., Solomon, A.M., Brown, S., Houghton, R.A., Trexier, M.C., Wisniewski, J., Carbon pools and flux of global forest ecosystems (1994) Science, 263 (80), pp. 185-190; Fisher, R.A., Williams, M., Do Vale, R.L., Da Costa, A.L., Meir, P., Evidence from Amazonian forests is consistent with isohydric control of leaf water potential (2006) Plant Cell Environ., 29, pp. 151-165; Foley, J.A., DeFries, R., Asner, G.P., Barford, C., Bonan, G., Carpenter, S.R., Chapin, F.S., Snyder, P.K., Global consequences of land use (2005) Science, 309, pp. 570-574; Fu, Z., Dong, J., Zhou, Y., Stoy, P.C., Niu, S., Long term trend and interannual variability of land carbon uptake—the attribution and processes (2017) Environ. Res. Lett., 12, p. 14018; Fuentes, J.D., Chamecki, M., dos Santos, R.M.N., Von Randow, C., Stoy, P.C., Katul, G., Fitzjarrald, D., Yañez-Serrano, A.M., Linking meteorology, turbulence, and air chemistry in the amazon rain forest (2016) Bull. Am. Meteorol. Soc., 97, pp. 2329-2342; Gerken, T., Chamecki, M., Fuentes, J.D., Air-parcel residence times within forest canopies (2017) Boundary-Layer Meteorol., 165, pp. 29-54; Giardina, F., Konings, A.G., Kennedy, D., Alemohammad, S.H., Oliveira, R.S., Uriarte, M., Gentine, P., Tall Amazonian forests are less sensitive to precipitation variability (2018) Nat. Geosci., 11, pp. 405-409; Gibson, L., Lee, T.M., Koh, L.P., Brook, B.W., Gardner, T.A., Barlow, J., Peres, C.A., Sodhi, N.S., Primary forests are irreplaceable for sustaining tropical biodiversity (2011) Nature, 478, pp. 378-381; Goulden, M.L., Miller, S.D., Da Rocha, H.R., Nocturnal cold air drainage and pooling in a tropical forest (2006) J. Geophys. Res. Atmos., p. 111; Grace, J., Lloyd, J., Mcintyre, J., Miranda, A., Meir, P., Miranda, H., Moncrieff, J., Gash, J., Fluxes of carbon dioxide and water vapour over an undisturbed tropical forest in south-west Amazonia (1995) Glob. Chang. Biol., 1, pp. 1-12; Grace, J., Malhi, Y., Lloyd, J., McIntyre, J., Miranda, A.C., Meir, P., Miranda, H.S., The use of eddy covariance to infer the net carbon dioxide uptake of Brazilian rain forest (1996) Glob. Chang. Biol., 2, pp. 209-217; Grace, J., Nagy, L., Forsberg, B.R., Artaxo, P., The Amazon carbon balance: an evaluation of methods and results (2016) Interactions Between Biosphere, Atmosphere and Human Land Use in the Amazon Basin., pp. 79-100. , Springer Berlin Heidelberg; Hall, C.A.S., Tian, H., Qi, Y., Pontius, G., Cornell, J., Modelling spatial and temporal patterns of tropical land use change (1995) J. Biogeogr., 22, pp. 753-757; Hayek, M.N., Wehr, R., Longo, M., Hutyra, L.R., Wiedemann, K., Munger, J.W., Bonal, D., Wofsy, S.C., A novel correction for biases in forest eddy covariance carbon balance (2018) Agric. For. Meteorol., 250-251, pp. 90-101; Hirano, T., Segah, H., Harada, T., Limin, S., June, T., Hirata, R., Osaki, M., Carbon dioxide balance of a tropical peat swamp forest in Kalimantan, Indonesia (2007) Glob. Chang. Biol., 13, pp. 412-425; Hirano, T., Jauhiainen, J., Inoue, T., Takahashi, H., Controls on the carbon balance of tropical peatlands (2008) Ecosystems, 12, pp. 873-887; Hirano, T., Segah, H., Kusin, K., Limin, S., Takahashi, H., Osaki, M., Effects of disturbances on the carbon balance of tropical peat swamp forests (2012) Glob. Change Biol., 18, pp. 3410-3422; Huete, A.R., Didan, K., Shimabukuro, Y.E., Ratana, P., Saleska, S.R., Hutyra, L.R., Yang, W., Myneni, R., Amazon rainforests green‐up with sunlight in dry season (2006) Geophys. Res. Lett., 33. , L06405; Huete, A.R., Restrepo-Coupe, N., Ratana, P., Didan, K., Saleska, S.R., Ichii, K., Panuthai, S., Gamo, M., Multiple site tower flux and remote sensing comparisons of tropical forest dynamics in Monsoon Asia (2008) Agric. For. Meteorol., 148, pp. 748-760; Hutyra, L.R., Munger, J.W., Saleska, S.R., Gottlieb, E., Daube, B.C., Dunn, A.L., Amaral, D.F., Wofsy, S.C., Seasonal controls on the exchange of carbon and water in an Amazonian rain forest (2007) J. Geophys. Res. Biogeosci., 112; Hutyra, L.R., Munger, J.W., Hammond-Pyle, E., Saleska, S.R., Restrepo-Coupe, N., Daube, B.C., de Camargo, P.B., Wofsy, S.C., Resolving systematic errors in estimates of net ecosystem exchange of CO2 and ecosystem respiration in a tropical forest biome (2008) Agric. For. Meteorol., 148, pp. 1266-1279; Inoue, Y., Ichie, T., Kenzo, T., Yoneyama, A., Kumagai, T., Nakashizuka, T., Effects of rainfall exclusion on leaf gas exchange traits and osmotic adjustment in mature canpopy trees of Dryobalanops aromatica (Sipterocarpaceae) in a Malaysian tropical rain forest (2016) J. Trop. Pediatr., pp. 1-11; Jocher, G., Ottosson Löfvenius, M., De Simon, G., Hörnlund, T., Linder, S., Lundmark, T., Marshall, J., Peichl, M., Apparent winter CO2 uptake by a boreal forest due to decoupling (2017) Agric. For. Meteorol., 232, pp. 23-34; Kiew, F., Hirata, R., Hirano, T., Wong, G.X., Aeries, E.B., Musin, K.K., Waili, J.W., Melling, L., CO2 balance of a secondary tropical peat swamp forest in Sarawak, Malaysia (2018) Agric. For. Meteorol., 248, pp. 494-501; Kim, D.-H., Sexton, J.O., Townshend, J.R., Accelerated deforestation in the humid tropics from the 1990s to the 2000s (2015) Geophys. Res. Lett., 42, pp. 3495-3501; Klein, T., The variability of stomatal sensitivity to leaf water potential across tree species indicates a continuum between isohydric and anisohydric behaviours (2014) Funct. Ecol., 28, pp. 1313-1320; Konings, A.G., Gentine, P., Global variations in ecosystem‐scale isohydricity (2016) Glob. Change Biol.; Körner, C., Leaf diffusive conductances in the major vegetation types of the globe (1995) Ecophysiology of Photosynthesis, pp. 463-490. , Springer; Kosugi, Y., Takanashi, S., Ohkubo, S., Matsuo, N., Tani, M., Mitani, T., Tsutsumi, D., Nik, A.R., CO2 exchange of a tropical rainforest at Pasoh in Peninsular Malaysia (2008) Agric. For. Meteorol., 148, pp. 439-452; Kosugi, Y., Takanashi, S., Tani, M., Ohkubo, S., Matsuo, N., Itoh, M., Noguchi, S., Nik, A.R., Effect of inter-annual climate variability on evapotranspiration and canopy CO2 exchange of a tropical rainforest in Peninsular Malaysia (2012) J. For. Res., 17, pp. 227-240; Kruijt, B., Elbers, J.A., Von Randow, C., Araujo, A.C., Oliveira, P.J., Culf, A., Manzi, A.O., Moors, E.J., The robustness of eddy correlation fluxes for Amazon rain forest conditions (2004) Ecol. Appl., 14, pp. 101-113; Kumagai, T., Porporato, A., Strategies of a Bornean tropical rainforest water use as a function of rainfall regime: isohydric or anisohydric? (2012) Plant Cell Environ., 35, pp. 61-71; Kutsch, W.L., Herbst, M., Vanselow, R., Hummelshøj, P., Jensen, N.O., Kappen, L., Stomatal acclimation influences water and carbon fluxes of a beech canopy in northern Germany (2001) Basic Appl. Ecol., 2, pp. 265-281; Lasslop, G., Reichstein, M., Papale, D., Richardson, A.D., Arneth, A., Barr, A.G., Stoy, P.C., Wohlfahrt, G., Separation of net ecosystem exchange into assimilation and respiration using a light response curve approach: critical issues and global evaluation (2010) Glob. Chang. Biol., 16, pp. 187-208; Levine, N.M., Zhang, K., Longo, M., Baccini, A., Phillips, O.L., Lewis, S.L., Alvarez-Dávila, E., Moorcroft, P.R., Ecosystem heterogeneity determines the ecological resilience of the Amazon to climate change (2016) Proc. Natl. Acad. Sci., 113, pp. 793-797; Lewis, S.L., Brando, P.M., Phillips, O.L., van der Heijden, G.M.F., Nepstad, D., The 2010 amazon drought (2011) Science, 331 (80), p. 554; Loescher, H.W., Oberbauer, S.F., Gholz, H.L., Clark, D.B., Environmental controls on net ecosystem-level carbon exchange and productivity in a Central American tropical wet forest (2003) Glob. Chang. Biol., 9, p. 396; Lopes, A.P., Nelson, B.W., Wu, J., Graça, P.M.L., de, A., Tavares, J.V., Prohaska, N., Saleska, S.R., Leaf flush drives dry season green-up of the Central Amazon (2016) Remote Sens. Environ., 182, pp. 90-98; Malhi, Y., Nobre, A.D., Grace, J., Kruijt, B., Pereira, M.G.P., Culf, A., Scott, S., Carbon dioxide transfer over a Central Amazonian rain forest (1998) J. Geophys. Res., 103, pp. 31593-31612; Marchin, R.M., Broadhead, A.A., Bostic, L.E., Dunn, R.R., Hoffmann, W.A., Stomatal acclimation to vapour pressure deficit doubles transpiration of small tree seedlings with warming (2016) Plant Cell Environ., 39, pp. 2221-2234; Martens, C.S., Shay, T.J., Mendlovitz, H.P., Matross, D.M., Saleska, S.R., Wofsy, S.C., Stephen Woodward, W., Crill, P.M., Radon fluxes in tropical forest ecosystems of Brazilian Amazonia: night‐time CO2 net ecosystem exchange derived from radon and eddy covariance methods (2004) Glob. Chang. Biol., 10, pp. 618-629; Martinez-Vilalta, J., Poyatos, R., Aguade, D., Retana, J., Mencuccini, M., A new look at water transport regulation in plants (2014) New Phytol., 204, pp. 105-115; Matheny, A.M., Mirfenderesgi, G., Bohrer, G., Trait-based representation of hydrological functional properties of plants in weather and ecosystem models (2017) Plant Divers., 39, pp. 1-12; Meir, P., Grace, J., Miranda, A.C., Leaf respiration in two tropical rainforests: constraints on physiology by phosphorus, nitrogen and temperature (2001) Funct. Ecol., 15, pp. 378-387; Miller, S.D., Goulden, M.L., Menton, M.C., da Rocha, H.R., de Freitas, H.C., Silva, E., Figueira, A.M., de Sousa, C.A.D., Biometric and micrometeorological measurements of tropical forest carbon balance (2004) Ecol. Appl., 14, pp. 114-126; Mitchard, E.T.A., The tropical forest carbon cycle and climate change (2018) Nature, 559, pp. 527-534; Navarro, M.N.V., Jourdan, C., Sileye, T., Braconnier, S., Mialet-Serra, I., Saint-Andre, L., Dauzat, J., Roupsard, O., Fruit development, not GPP, drives seasonal variation in NPP in a tropical palm plantation (2008) Tree Physiol., 28, pp. 1661-1674; Nepstad, D.C., Moutinho, P., Dias‐Filho, M.B., Davidson, E., Cardinot, G., Markewitz, D., Figueiredo, R., Schwalbe, K., The effects of partial throughfall exclusion on canopy processes, aboveground production, and biogeochemistry of an Amazon forest (2002) J. Geophys. Res., 107. , 8085; Norby, R.J., De Kauwe, M.G., Domingues, T.F., Duursma, R.A., Ellsworth, D.S., Goll, D.S., Lapola, D.M., Zaehle, S., Model – data synthesis for the next generation of forest free-air CO2 enrichment (FACE) experiments (2015) New Phytol., pp. 17-28; Novick, K., Oren, R., Stoy, P.C., Juang, J.Y., Siqueira, M., Katul, G., The relationship between reference canopy conductance and simplified hydraulic architecture (2009) Adv. Water Resour., 32, pp. 809-819; Novick, K.A., Ficklin, D.L., Stoy, P.C., Williams, C.A., Bohrer, G., Oishi, A.C., Papuga, S.A., Phillips, R.P., The increasing importance of atmospheric demand for ecosystem water and carbon fluxes (2016) Nat. Clim. Change, 6, pp. 1023-1027; Oberbauer, S.F., Loescher, H.W., Clark, D.B., Effects of climate factors on daytime carbon exchange from an old growth forest in Costa rica (2000) Selbyana, pp. 66-73; Oren, R., Sperry, J.S., Katul, G.G., Pataki, D.E., Ewers, B.E., Phillips, N., Schäfer, K.V.R., Survey and synthesis of intra- and interspecific variation in stomatal sensitivity to vapour pressure deficit (1999) Plant Cell Environ., 22, pp. 1515-1526; Pan, Y., Birdsey, R.A., Fang, J., Houghton, R., Kauppi, P.E., Kurz, W.A., Phillips, O.L., Hayes, D., A large and persistent carbon sink in the world's forests (2011) Science, 333 (80). , 988 LP-993; Paoli, G.D., Curran, L.M., Slik, J.W.F., Soil nutrients affect spatial patterns of aboveground biomass and emergent tree density in southwestern Borneo (2008) Oecologia, 155, pp. 287-299; Papale, D., Reichstein, M., Aubinet, M., Canfora, E., Bernhofer, C., Kutsch, W., Longdoz, B., Yakir, D., Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation (2006) Biogeosciences, 3, pp. 571-583; Pau, S., Detto, M., Kim, Y., Still, C.J., Tropical forest temperature thresholds for gross primary productivity (2018) Ecosphere, 9; Pavlick, R., Drewry, D.T., Bohn, K., Reu, B., Kleidon, A., The Jena Diversity-Dynamic Global Vegetation Model (JeDi-DGVM): a diverse approach to representing terrestrial biogeography and biogeochemistry based on plant functional trade-offs (2013) Biogeosciences, 10, pp. 4137-4177; Phillips, O.L., Malhi, Y., Higuchi, N., Laurance, W.F., Núñez, P.V., Vásquez, R.M., Laurance, S.G., Grace, J., Changes in the carbon balance of tropical forests: Evidence from long-term plots (1998) Science, 282 (80). , 439 LP-442; Phillips, O.L., Aragão, L.E.O.C., Lewis, S.L., Fisher, J.B., Lloyd, J., López-González, G., Malhi, Y., Torres-Lezama, A., Drought sensitivity of the Amazon Rainforest (2009) Science, 323 (80), pp. 1344-1347; Powell, T.L., Wheeler, J.K., de Oliveira, A.A.R., da Costa, A.C.L., Saleska, S.R., Meir, P., Moorcroft, P.R., Differences in xylem and leaf hydraulic traits explain differences in drought tolerance among mature Amazon rainforest trees (2017) Glob. Change Biol.; Raich, J.W., Russell, A.E., Vitousek, P.M., Primary productivity and ecosystem development along an elevational gradient on Mauna Loa, Hawai'i (1997) Ecology, 78, pp. 707-721; Reichstein, M., Falge, E., Baldocchi, D., Papale, D., Aubinet, M., Berbigier, P., Bernhofer, C., Valentini, R., On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm (2005) Glob. Change Biol., 11, pp. 1424-1439; Restrepo-Coupe, N., da Rocha, H.R., Hutyra, L.R., da Araujo, A.C., Borma, L.S., Christoffersen, B., Cabral, O.M.R., Saleska, S.R., What drives the seasonality of photosynthesis across the Amazon basin? A cross-site analysis of eddy flux tower measurements from the Brasil flux network (2013) Agric. For. Meteorol.; Rice, W.R., Analyzing tables of statistical tests (1989) Evolution (N. Y.), 43, pp. 223-225; Richardson, A.D., Braswell, B.H., Hollinger, D.Y., Jenkins, J.P., Ollinger, S.V., Near-surface remote sensing of spatial and temporal variation in canopy phenology (2009) Ecol. Appl., 19, pp. 1417-1428; Roderick, M.L., Farquhar, G.D., The cause of decreased Pan evaporation over the past 50 years (2002) Science, 298 (80), pp. 1410-1411; Roupsard, O., Bonnefond, J.-M., Irvine, M., Berbigier, P., Nouvellon, Y., Dauzat, J., Taga, S., Bouillet, J.-P., Partitioning energy and evapo-transpiration above and below a tropical palm canopy (2006) Agric. For. Meteorol., 139, pp. 252-268; Saleska, S.R., Miller, S.D., Matross, D.M., Goulden, M., Wofsy, S., da Rocha, H.R., de Camargo, P.B., Silva, H., Carbon in Amazon forests: unexpected seasonal fluxes and disturbance-induced losses (2003) Science, 302 (80), pp. 1554-1557; Saleska, S.R., Didan, K., Huete, A.R., Da Rocha, H.R., Amazon forests green-up during 2005 drought (2007) Science, 318 (80), p. 612; Saleska, S., Da Rocha, H., Kruijt, B., Nobre, A., Ecosystem carbon fluxes and Amazonian forest metabolism (2009) Amazonia Glob. Change, pp. 389-407; Saleska, S.R., Wu, J., Guan, K., Araujo, A.C., Huete, A., Nobre, A.D., Restrepo-Coupe, N., Dry-season greening of Amazon forests (2016) Nature, 531, pp. E4-E5; Salinas, N., Malhi, Y., Meir, P., Silman, M., Roman Cuesta, R., Huaman, J., Salinas, D., Farfan, F., The sensitivity of tropical leaf litter decomposition to temperature: results from a large-scale leaf translocation experiment along an elevation gradient in Peruvian forests (2011) New Phytol., 189, pp. 967-977; Santana, R.A., Dias-Júnior, C.Q., da Silva, J.T., Fuentes, J.D., do Vale, R.S., Alves, E.G., dos Santos, R.M.N., Manzi, A.O., Air turbulence characteristics at multiple sites in and above the Amazon rainforest canopy (2018) Agric. For. Meteorol., 260-261, pp. 41-54; Santos, D.M., Acevedo, O.C., Chamecki, M., Fuentes, J.D., Gerken, T., Stoy, P.C., Temporal scales of the nocturnal flow within and above a forest canopy in Amazonia (2016) Boundary-Layer Meteorol., pp. 1-26; Siddiq, Z., Chen, Y.-J., Zhang, Y.-J., Zhang, J.-L., Cao, K.-F., More sensitive response of crown conductance to VPD and larger water consumption in tropical evergreen than in deciduous broadleaf timber trees (2017) Agric. For. Meteorol., 247, pp. 399-407; Sulman, B.N., Roman, D.T., Yi, K., Wang, L., Phillips, R.P., Novick, K.A., High atmospheric demand for water can limit forest carbon uptake and transpiration as severely as dry soil (2016) Geophys. Res. Lett., 43, pp. 9686-9695; Swann, A.L.S., Hoffman, F.M., Koven, C.D., Randerson, J.T., Plant responses to increasing CO2 reduce estimates of climate impacts on drought severity (2016) Proc. Natl. Acad. Sci. U. S. A., 113, pp. 10019-10024; Taylor, K.E., Stouffer, R.J., Meehl, G.A., An overview of CMIP5 and the experiment design (2012) Bull. Am. Meteorol. Soc.; Taylor, P.G., Cleveland, C.C., Wieder, W.R., Sullivan, B.W., Doughty, C.E., Dobrowski, S.Z., Townsend, A.R., Temperature and rainfall interact to control carbon cycling in tropical forests (2017) Ecol. Lett., 20, pp. 779-788; Thomas, C.K., Martin, J.G., Law, B.E., Davis, K., Toward biologically meaningful net carbon exchange estimates for tall, dense canopies: multi-level eddy covariance observations and canopy coupling regimes in a mature Douglas-fir forest in Oregon (2013) Agric. For. Meteorol., 173, pp. 14-27; Tóta, J., Fitzjarrald, D.R., da Silva Dias, M.A.F., Amazon rainforest exchange of carbon and subcanopy air flow: manaus LBA Site—a complex terrain condition (2012) Transfus. Apher. Sci., , 165067; Tyukavina, A., Baccini, A., Hansen, M.C., Potapov, P.V., Stehman, S.V., Houghton, R.A., Krylov, A.M., Goetz, S.J., Aboveground carbon loss in natural and managed tropical forests from 2000 to 2012 (2015) Environ. Res. Lett., 10, p. 74002; van Marle, M.J.E., Field, R.D., van der Werf, G.R., Estrada de Wagt, I.A., Houghton, R.A., Rizzo, L.V., Artaxo, P., Tsigaridis, K., Fire and deforestation dynamics in Amazonia (1973-2014) (2017) Glob. Biogeochem. Cycles, 31, pp. 24-38; Wieder, W.R., Cleveland, C.C., Townsend, A.R., Controls over leaf litter decomposition in wet tropical forests (2009) Ecology, 90, pp. 3333-3341; Wolf, S., Eugster, W., Majorek, S., Buchmann, N., Afforestation of tropical pasture only marginally affects ecosystem-scale evapotranspiration (2011) Ecosystems, 14, pp. 1264-1275; Wolf, S., Eugster, W., Potvin, C., Buchmann, N., Strong seasonal variations in net ecosystem CO2 exchange of a tropical pasture and afforestation in Panama (2011) Agric. For. Meteorol., 151, pp. 1139-1151; Wolf, S., Eugster, W., Potvin, C., Turner, B.L., Buchmann, N., Carbon sequestration potential of tropical pasture compared with afforestation in Panama (2011) Glob. Change Biol., 17, pp. 2763-2780; Wood, A.W., Leung, L.R., Sridhar, V., Lettenmaier, D.P., Hydrologic implications of dynamical and statistical approaches to downscaling climate model outputs (2004) Clim. Change, 62, pp. 189-216; Wu, J., Guan, K., Hayek, M., Restrepo-Coupe, N., Wiedemann, K.T., Xu, X., Wehr, R., Saleska, S.R., Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales (2017) Glob. Change Biol., 23, pp. 1240-1257; Xiao, J., Liu, S., Stoy, P.C., Preface: impacts of extreme climate events and disturbances on carbon dynamics (2016) Biogeosciences, 13, pp. 3665-3675 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 831  
Permanent link to this record
 

 
Author N'Guessan, A.E.; N'dja, J.K.; Yao, O.N.; Amani, B.H.K.; Gouli, R.G.Z.; Piponiot, C.; Zo-Bi, I.C.; Herault, B. doi  openurl
  Title Drivers of biomass recovery in a secondary forested landscape of West Africa Type Journal Article
  Year 2019 Publication Forest Ecology and Management Abbreviated Journal  
  Volume 433 Issue Pages 325-331  
  Keywords Biomass; Cultivation; Ecology; Recovery; Secondary recovery; Agricultural land; Bayesian frameworks; Diameter-at-breast heights; Forested landscapes; Neotropical forests; Old-growth forest; Physical environments; Secondary forests; Forestry; Dioscorea alata  
  Abstract The rapidly growing human population in West Africa has generated increasing demand for agricultural land and forest products. Consequently 90% of the original rainforest cover has now disappeared and the remainder is heavily fragmented and highly degraded. Although many studies have focused on carbon stocks and fluxes in intact African forests, little information exists on biomass recovery rates in secondary forests. We studied a chronosequence of 96 secondary and old-growth forest fragments (0.2 ha each) where 32.103 trees with Diameter at Breast Height > 2.5 cm have been censused. We modelled the biomass recovery trajectories in a time-explicit Bayesian framework and tested the effect on recovery rates of a large set of covariates related to the physical environment, plot history, and forest connectivity. Recovery rate trajectory is highly non-linear: recovery rates accelerated from 1 to 37 years, when biomass recovery reached 4.23 Mg /ha /yr, and decelerated afterwards. We predict that, on average, 10%, 25% and 50% of the old-growth forest biomass is respectively recovered 17, 30, and 51 years after abandonment. Recovery rates are strongly shaped by both the number of remnant trees (residuals of the former old-growth forest) and the previous crop cultivated before abandonment. The latter induced large differences in the time needed to recover 50% of an old-growth forest biomass: from 38 years for former Yam fields up to 86 years for former rice fields. Our results emphasize (i) the very slow recovery rates of West African forests, as compared to Neotropical forests (ii) the long-lasting impacts of past human activities and management choices on ecosystem biomass recovery in West African degraded forests.  
  Address  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 03781127 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 838  
Permanent link to this record
 

 
Author Maurice, L.; López, F.; Becerra, S.; Jamhoury, H.; Le Menach, K.; Dévier, M.-H.; Budzinski, H.; Prunier, J.; Juteau-Martineau, G.; Ochoa-Herrera, V.; Quiroga, D.; Schreck, E. doi  openurl
  Title Drinking water quality in areas impacted by oil activities in Ecuador: Associated health risks and social perception of human exposure Type Journal Article
  Year 2019 Publication Science of the Total Environment Abbreviated Journal Sci. Total Environ.  
  Volume 690 Issue Pages 1203-1217  
  Keywords Demineralized waters; Domestic waters; Hydrocarbons; Metal(loid)s; Oil activities; Social risk perception; Benzene refining; Health; Health risks; Hydrocarbons; Petroleum refineries; Petroleum refining; Polycyclic aromatic hydrocarbons; Potable water; Risk assessment; Risk perception; Toluene; Trace elements; Water quality; Water wells; Zinc; Arsenic concentration; Demineralized water; Domestic water; Information sources; Living conditions; Microbiological analysis; Natural backgrounds; Oil activities; Water distribution systems  
  Abstract The unregulated oil exploitation in the Northern Ecuadorian Amazon Region (NEAR), mainly from 1964 to the 90's, led to toxic compounds largely released into the environment. A large majority of people living in the Amazon region have no access to drinking water distribution systems and collects water from rain, wells or small streams. The concentrations of major ions, trace elements, PAHs (polycyclic aromatic hydrocarbons) and BTEX (benzene, toluene, ethylbenzene, xylenes) were analyzed in different water sources to evaluate the impacts of oil extraction and refining. Samples were taken from the NEAR and around the main refinery of the country (Esmeraldas Oil Refinery/State Oil Company of Ecuador) and were compared with domestic waters from the Southern region, not affected by petroleum activities. In most of the samples, microbiological analysis revealed a high level of coliforms representing significant health risks. All measured chemical compounds in waters were in line with national and international guidelines, except for manganese, zinc and aluminum. In several deep-water wells, close to oil camps, toluene concentrations were higher than the natural background while PAHs concentrations never exceeded individually 2 ng·L−1. Water ingestion represented 99% of the total exposure pathways for carcinogenic and non-carcinogenic elements (mainly zinc) in adults and children, while 20% to 49% of the Total Cancer Risk was caused by arsenic concentrations. The health index (HI) indicates acceptable chronic effects for domestic use according the US-EPA thresholds. Nevertheless, these limits do not consider the cocktail effects of metallic and organic compounds. Furthermore, they do not include the social determinants of human exposure, such as socio-economic living conditions or vulnerability. Most (72%) of interviewed families knew sanitary risks but a discrepancy was observed between knowledge and action: religious beliefs, cultural patterns, information sources, experience and emotions play an important role front to exposure. © 2019  
  Address Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel HillNC 2759, United States  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00489697 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 877  
Permanent link to this record
 

 
Author Dessert, C.; Clergue, C.; Rousteau, A.; Crispi, O.; Benedetti, M.F. url  doi
openurl 
  Title Atmospheric contribution to cations cycling in highly weathered catchment, Guadeloupe (Lesser Antilles) Type Journal Article
  Year 2020 Publication Chemical Geology Abbreviated Journal Chem. Geol.  
  Volume 531 Issue 119354 Pages  
  Keywords Atmospheric deposit; Cation-nutrient recycling; Critical Zone; Saharan dust; Sr and Nd isotopes; Atmospheric chemistry; Biogeochemistry; Catchments; Deposits; Dust; Ecosystems; Forestry; Isotopes; Lakes; Positive ions; Rain; Recycling; Runoff; Soil moisture; Soil surveys; Tropics; Vegetation; Volcanoes; Weathering; Atmospheric deposits; Critical zones; Nutrient recycling; Saharan dust; Sr and Nd isotopes; Nutrients; catchment; cation; dust; isotopic composition; neodymium isotope; regolith; strontium isotope; trace element; water chemistry; water quality; Guadeloupe; Leeward Islands [Lesser Antilles]; Sahara  
  Abstract The important fertilizing role of atmospheric dust, and particularly African dust, in tropical rainforests is increasingly recognized but still poorly quantified. To better evaluate dust input into the Caribbean basin, we sampled critical zone compartments of a small forested volcanic catchment in Guadeloupe (soils, parent rock, atmospheric dust, plants, soil solutions, stream and rain waters). The aims of this study are to track sources of cation nutrients (Ca, Mg, K, Sr) developed on highly weathered soil in the rainforest of Guadeloupe, to quantify plant recycling of these nutrients, and to identify constraints on regolith development and its associated nutrient pool. In the Quiock Creek catchment, a large isotopic range of 87Sr/86Sr and eNd values was observed despite the small scale of observation. Sr isotopic composition of the dissolved load varied from 0.7084 in rainfall to 0.7110 in soil solution, whereas it ranges between 0.7068 and 0.7153 for soil samples and between 0.7096 and 0.7102 for plants. The Nd isotopic composition varied between -8.39 in near-surface soil samples to 2.71 in deeper soil. All samples had an intermediate signature between that of the bedrock endmember (87Sr/86Sr = 0.7038; eNd = 4.8) and the atmospheric endmember (sea salt: 87Sr/86Sr = 0.7092 and Saharan dust: 87Sr/86Sr = 0.7187, eNd=-11.5). The regolith was built on pyroclastic deposits, but, because of extreme leaching, the regolith has lost its original bedrock signature and inherited an exogenous atmospheric signature. Our results show that only the chemical weathering of the fresh near-surface minerals can provide nutrients to the ecosystem (first 30 cm). However, this dust weathering is too low to sustain the tropical forest ecosystem on its own. The cationic mass balance at the catchment scale, as well as the Sr isotopic signature, show that cation and Sr fluxes are of atmospheric origin only and that original bedrock no longer participates in nutrient cycles. The vegetation reflects the 87Sr/86Sr of the dissolved pool of atmospheric Sr. At the soil-plant scale, the cation-nutrient fluxes provided by vegetation (litter fall + leaf excretion) are major compared to input and output fluxes. The annual Ca, K, Sr and Mg fluxes within the vegetation are, respectively, 31, 28, 20 and 3 times greater than the exported fluxes at the outlet of the basin. The residence time of nutrients in the vegetation is 16 years for K and close to 45 years for Sr, Ca and Mg. These results emphasize the highly efficient vegetative turnover that dominates the nutrient cycle in the Quiock Creek catchment. This first characterization of biogeochemical cycles in the Guadeloupean rainforest suggests that the forest community of Quiock Creek is sustained by a small near-surface nutrient pool disconnected from the deep volcanic bedrock. We also demonstrated that, even with efficient nutrient recycling, Saharan dust plays a significant role in maintaining ecosystem productivity in Guadeloupe over long-time scales.  
  Address Laboratoire de biologie et de physiologie végétales, UMR EcoFoG, CNRS, Cirad, INRA, Université des Antilles, Université de Guyane, Pointe-à-Pitre, 97159, France  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00092541 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 18 November 2019; Correspondence Address: Dessert, C.; Université de Paris, Institut de physique du globe de Paris, CNRSFrance; email: dessert@ipgp.fr Approved no  
  Call Number EcoFoG @ webmaster @ Serial 895  
Permanent link to this record
 

 
Author Céréghino, R.; Françoise, L.; Bonhomme, C.; Carrias, J.-F.; Compin, A.; Corbara, B.; Jassey, V.; Leflaive, J.; Rota, T.; Farjalla, V.; Leroy, C. doi  openurl
  Title Desiccation resistance traits predict freshwater invertebrate survival and community response to drought scenarios in a Neotropical ecosystem Type Journal Article
  Year 2020 Publication Ecological Indicators Abbreviated Journal Ecol. Indic.  
  Volume 119 Issue 106839 Pages  
  Keywords Climate change; Functional traits; Lt50; Macroinvertebrates; Rainforests; Biodiversity; Climate change; Driers (materials); Drought; Environmental management; Population statistics; Tanks (containers); Water; Aquatic invertebrates; Climate change adaptation; Controlled conditions; Environmental managers; Freshwater biodiversity; Freshwater invertebrates; Future climate scenarios; Laboratory conditions; Aquatic organisms; aquatic community; biodiversity; climate change; cuticle; desiccation; drought stress; invertebrate; Neotropical Region; population size; survival; French Guiana; Invertebrata  
  Abstract The intensification of dry seasons is a major threat to freshwater biodiversity in Neotropical regions. Little is known about resistance to drying stress and the underpinning traits in Neotropical freshwater species, so we don't know whether desiccation resistance allows to anticipate shifts in biological diversity under future climate scenarios. Here, we used the aquatic invertebrates that live in the rainwater-filled leaves of tank bromeliads, to examine the extent to which desiccation resistance of species measured in the laboratory predicts community response to drought intensification in nature. We measured desiccation resistance in 17 invertebrate species (>90% of the biomass usually found in bromeliads of French Guiana) by recording the median lethal time (LT50) of experimental populations exposed to controlled conditions of residual moisture. In the field, we placed rainshelters above tank bromeliads to emulate drought scenarios ranging from the ambient norm to IPCC scenarios and extreme events, and we recorded the response of functional community structure. LT50 ranged from 4.18 to 19.06 days, and was related to cuticle content and dry body mass. Among other functional indicators that represent strategies to optimize resource use under stressful conditions (e.g., habitat use, trophic specialization), LT50 was the best predictor of community structure responses along a gradient of emulated drought intensities. Therefore, species’ LT50s measured under laboratory conditions can be used to forecast aquatic community response to drying stress in nature. Anticipating how species will cope with drought has never been more important for environmental managers to support climate change adaptation. We show that desiccation resistance in freshwater invertebrates is a key indicator of potential population size and local–global range shifts, and this could be especially true in the Neotropics where species have narrow physiological tolerances for climatic variation. © 2020 Elsevier Ltd  
  Address ECOFOG, AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles, Campus Agronomique, Kourou, 97379, France  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1470160x (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 941  
Permanent link to this record
 

 
Author Sardans, J.; Urbina, I.; Grau, O.; Asensio, D.; Ogaya, R.; Peñuelas, J. doi  openurl
  Title Long-term drought decreases ecosystem C and nutrient storage in a Mediterranean holm oak forest Type Journal Article
  Year 2020 Publication Environmental and Experimental Botany Abbreviated Journal Environ. Exp. Bot.  
  Volume 177 Issue 104135 Pages  
  Keywords Aridity; Carbon stocks; Climate change; Nitrogen; Phosphorus; Potassium; Stoichiometry; carbon sequestration; deciduous forest; drought; experimental study; forest soil; long-term change; Mediterranean environment; net ecosystem exchange; nutrient cycling; shrub; stoichiometry; Mediterranean Sea; Phillyrea latifolia  
  Abstract Aridity has increased in recent decades in the Mediterranean Basin and is projected to continue to increase in the coming decades. We studied the consequences of drought on the concentrations, stoichiometries and stocks of carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in leaves, foliar litter of a three dominant woody species and soil of a Mediterranean montane holm oak forest where soil-water content was experimentally reduced (15 % lower than the control plots) for 15 years. Nitrogen stocks were lower in the drought plots than in the control plots (8.81 ± 1.01 kg ha−1 in the forest canopy and 856 ± 120 kg ha−1 in the 0−15 cm soil layer), thus representing 7 and 18 % lower N stocks in the canopy and soil respectively. δ15N was consistently higher under drought conditions in all samples, indicating a general loss of N. Foliar C and K stocks were also lower but to a lesser extent than N. Decreases in biomass and C and N stocks due to drought were smallest for the most dominant tall shrub, Phillyrea latifolia, so our results suggest a lower capacity of this forest to store C and nutrients but also substantial resulting changes in forest structure with increasing drought. © 2020 Elsevier B.V.  
  Address Cirad, UMR EcoFoG (AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane), Campus Agronomique, Kourou, 97310, French Guiana  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 00988472 (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 954  
Permanent link to this record
 

 
Author Donald, J.; Maxfield, P.; Leroy, C.; Ellwood, M.D.F. doi  openurl
  Title Epiphytic suspended soils from Borneo and Amazonia differ in their microbial community composition Type Journal Article
  Year 2020 Publication Acta Oecologica Abbreviated Journal Acta Oecol.  
  Volume 106 Issue Pages  
  Keywords Asplenium; Bacteria; Borneo; Bromeliaceae; Canopy; French Guiana; Fungi; Plfa; Rainforest; bacterium; community composition; epiphyte; fungus; microbial community; niche; relative abundance; soil microorganism; species diversity; tropical forest; Amazonia; Borneo; Danum Valley; East Malaysia; French Guiana; Malaysia; Nouragues; Sabah; Asplenium; Asplenium nidus; Aves; Bacteria (microorganisms); Bromeliaceae; Fungi  
  Abstract Microbial organisms support the high species diversity associated with tropical forests, and likely drive functional processes, but microorganisms found in rainforest canopies are not well understood. We quantified the microbial diversity of suspended soils from two classical epiphytic model systems (bromeliads & bird's nest ferns) across two localities: the Nouragues Reserve in French Guiana and Danum Valley in Malaysian Borneo. Non-epiphytic suspended soils were also collected as controls at the Nouragues Reserve. Effects of epiphyte type and sample location on microbial community composition were determined using Phospholipid Fatty Acid (PLFA) analysis. Total microbial biomass remained constant across the suspended soil types, but PLFA peaks denoting the relative abundance of different microbes varied between bromeliads, bird's nest ferns and non-epiphytic control soils. Suspended soils associated with bird's nest ferns from Borneo contained a microbial community significantly different in composition from those of congeneric bird's nest ferns from Amazonia, due to shifts in the relative abundance of fungi and bacteria. Our findings reveal that epiphytes create convergent niches for microorganisms in tropical canopies, while highlighting the sensitive nature of suspended soil microbial communities. © 2020 Elsevier Masson SAS  
  Address 20 Baily Place, Cheswick, Bristol, BS16 1BG, United Kingdom  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1146609x (Issn) ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 959  
Permanent link to this record
 

 
Author Hiltner, Ulrike ; Huth, Andreas ; Hérault, Bruno ; Holtmann, Anne ; Brauning, Achim ; Fischer, Rico doi  openurl
  Title Climate change alters the ability of neotropical forests to provide timber and sequester carbon Type Journal Article
  Year 2021 Publication Forest Ecology and Management Abbreviated Journal  
  Volume 492 Issue Pages 119166  
  Keywords Exploitation forestière ; Changement climatique ; séquestration du carbone ; Production du bois ; Atténuation des effets du changement climatique ; gestion forestière durable ; forêt tropicale ; Région néotropicale ; Biomasse ; biomasse aérienne des arbres ; gestion de la santé des forêts ; modèle de croissance forestière ; biodiversité forestière  
  Abstract Logging is widespread in tropical regions, with approximately 50% of all humid tropical forests (1.73 × 109 ha) regarded as production forests. To maintain the ecosystem functions of carbon sequestration and timber supply in tropical production forests over a long term, forest management must be sustainable under changing climate conditions. Individual-based forest models are useful tools to enhance our understanding about the long-term effects of harvest and climate change on forest dynamics because they link empirical field data with simulations of ecological processes. The objective of this study is to analyze the combined effects of selective logging and climate change on biomass stocks and timber harvest in a tropical forest in French Guiana. By applying a forest model, we simulated natural forest dynamics under the baseline scenario of current climate conditions and compared the results with scenarios of selective logging under climate change. The analyses revealed how substantially forest dynamics are altered
under different scenarios of climate change. (1) Repeated logging within recovery times decreased biomass and timber harvest, irrespective of the intensity of climate change. (2) With moderate climate change as envisaged by the 5th IPCC Assessment Report (representative concentration pathway 2.6), the average biomass remained the same as in the baseline scenario (−1%), but with intensive climate change (RCP 8.5), the average biomass decreased by 12%. (3) The combination of selective logging and climate change increased the likelihood of changes in forest dynamics, driven mainly by rising temperatures. Under RCP 8.5, the average timber harvest was almost halved, regardless of the logging cycle applied. An application-oriented use of forest models will help to identify opportunities to reduce the effects of unwanted ecosystem changes in a changing environment. To ensure that ecosystem functions in production forests are maintained under climate change conditions, appropriate management strategies will help to maintain biomass and harvest in production forests.
 
  Address  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 1016  
Permanent link to this record
 

 
Author Amani, Bienvenu H.K. ; N'Guessan, Anny E. ; Derroire, Géraldine ; N'dja, Justin K. ; Elogne, Aka G. M. ; Traoré, Karidia ; Zo-Bi, Irie C. ; Hérault, Bruno doi  openurl
  Title The potential of secondary forests to restore biodiversity of the lost forests in semi-deciduous West Africa Type Journal Article
  Year 2021 Publication Biological Conservation Abbreviated Journal  
  Volume 259 Issue Pages  
  Keywords  
  Abstract In West Africa, more than 80% of the original forest cover has disappeared due to the exponential growth of human populations in a recurrent search for new agricultural land. Once the fertility of the land is exhausted, these areas are abandoned and left to be reforested through natural succession. Despite the widespread presence of secondary forests of various ages in West African landscapes, little is known about the trajectories of recovery and the environmental factors that influence recovery rates. We set up 96 0.2 ha forest plots, along a chronosequence of 1 to 40 years and including 7 controls, on which all trees larger than 2.5 cm in diameter at breast height were inventoried. We modelled the recovery trajectories of four complementary dimensions of biodiversity (richness, diversity, composition, indicators of old-growth forest) in a Bayesian framework. Our results show that the four dimensions of biodiversity recover at different rates, with composition recovering much faster than floristic diversity. Among the local, landscape, and historical factors studied, the number of remnants and proximity to old-growth forests have a positive impact on recovery rates, with, under good environmental conditions, the composition, richness, and diversity being almost completely recovered in less than 25 years. Our results demonstrate the very high resilience of the composition of the semi-deciduous forests of West Africa, but also suggest that the management of these post-forest areas must be differentiated according to the landscape context and the presence of isolated trees, which are the last vestiges of the former forest. In unfavourable conditions, natural dynamics should be assisted by agroforestry practices and local tree planting to allow for a rapid restoration of forest goods and services to local populations.  
  Address  
  Corporate Author Thesis  
  Publisher (down) Elsevier B.V. Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number EcoFoG @ webmaster @ Serial 1010  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: