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| Author | Baraloto, C.; Goldberg, D.E. | ||||
| Title | Microhabitat associations and seedling bank dynamics in a neotropical forest | Type | Journal Article | ||
| Year | 2004 | Publication | Oecologia | Abbreviated Journal  |
Oecologia |
| Volume | 141 | Issue | 4 | Pages | 701-712 |
| Keywords | French Guiana; life history traits; light availability; regeneration niche; soil nutrients | ||||
| Abstract | We conducted a rigorous test of tropical tree seedling microhabitat differentiation by examining microhabitat associations, survival and growth of established seedlings of ten tropical tree species representing a four-factor gradient in seed size. Eight microhabitat variables describing soil and light conditions were measured directly adjacent to each of 588 seedlings within twelve 10 x 100 m belt transects at Paracou, French Guiana, and at 264 reference points along the transects. From these measurements, we defined three principal components describing soil richness, soil softness and canopy openness. Six of ten species ( in 9 of 30 total cases) were distributed non-randomly with respect to microhabitat along at least one principal component. However, few species demonstrated clear microhabitat specialization. All shifts in distribution relative to reference points were in the same direction ( richer, softer soil). Furthermore, of 135 pairwise comparisons among the species, only 7 were significantly different. More than three-fourths of all seedlings (75.3%) survived over the 2-year monitoring period, but survival rates varied widely among species. In no case was the probability of survival influenced by any microhabitat parameter. Relative height growth rates for the seedlings over 2 years varied from – 0.031 cm cm(-1) year(-1) (Dicorynia guianensis, Caesalpiniaceae) to 0.088 cm cm(-1) year(-1) (Virola michelii, Myristicaceae). In only 4 of 30 cases was height growth significantly associated with one of the three principal components. Because the conditions in this study were designed to maximize the chance of finding microhabitat differentiation among a group of species differing greatly in life history traits, the lack of microhabitat specialization it uncovered suggests that microhabitat partitioning among tropical tree species at the established seedling stage is unlikely to contribute greatly to coexistence among these species. | ||||
| Address | INRA Kourou, UMR Ecol Forets Guyane, Kourou 97387, French Guiana, Email: baraloto.c@kourou.cirad.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | SPRINGER | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0029-8549 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000224999800015 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 233 | ||
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| Author | Orivel, J.; Lambs, L.; Male, P.J.G.; Leroy, C.; Grangier, J.; Otto, T.; Quilichini, A.; Dejean, A. | ||||
| Title | Dynamics of the association between a long-lived understory myrmecophyte and its specific associated ants | Type | Journal Article | ||
| Year | 2011 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 165 | Issue | 2 | Pages | 369-376 |
| Keywords | Allomerus decemarticulatus; Hirtella physophora; Lifespan; Mutualism; Myrmecophyte | ||||
| Abstract | Myrmecophytic symbioses are widespread in tropical ecosystems and their diversity makes them useful tools for understanding the origin and evolution of mutualisms. Obligate ant-plants, or myrmecophytes, provide a nesting place, and, often, food to a limited number of plant-ant species. In exchange, plant-ants protect their host plants from herbivores, competitors and pathogens, and can provide them with nutrients. Although most studies to date have highlighted a similar global pattern of interactions in these systems, little is known about the temporal structuring and dynamics of most of these associations. In this study we focused on the association between the understory myrmecophyte Hirtella physophora (Chrysobalanaceae) and its obligate ant partner Allomerus decemarticulatus (Myrmicinae). An examination of the life histories and growth rates of both partners demonstrated that this plant species has a much longer lifespan (up to about 350 years) than its associated ant colonies (up to about 21 years). The size of the ant colonies and their reproductive success were strongly limited by the available nesting space provided by the host plants. Moreover, the resident ants positively affected the vegetative growth of their host plant, but had a negative effect on its reproduction by reducing the number of flowers and fruits by more than 50%. Altogether our results are important to understanding the evolutionary dynamics of ant-plant symbioses. The highly specialized interaction between long-lived plants and ants with a shorter lifespan produces an asymmetry in the evolutionary rates of the interaction which, in return, can affect the degree to which the interests of the two partners converge. | ||||
| Address | [Orivel, Jerome; Leroy, Celine; Quilichini, Angelique; Dejean, Alain] CNRS, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | Springer | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0029-8549 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000286224900012 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 295 | ||
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| Author | Barantal, S.; Roy, J.; Fromin, N.; Schimann, H.; Hattenschwiler, S. | ||||
| Title | Long-term presence of tree species but not chemical diversity affect litter mixture effects on decomposition in a neotropical rainforest | Type | Journal Article | ||
| Year | 2011 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 167 | Issue | 1 | Pages | 241-252 |
| Keywords | Amazonian rainforest; Chemical diversity; Decomposition; Functional diversity indices; Litter traits | ||||
| Abstract | Plant litter diversity effects on decomposition rates are frequently reported, but with a strong bias towards temperate ecosystems. Altered decomposition and nutrient recycling with changing litter diversity may be particularly important in tree species-rich tropical rainforests on nutrient-poor soils. Using 28 different mixtures of leaf litter from 16 Amazonian rainforest tree species, we tested the hypothesis that litter mixture effects on decomposition increase with increasing functional litter diversity. Litter mixtures and all single litter species were exposed in the field for 9 months using custom-made microcosms with soil fauna access. In order to test the hypothesis that the long-term presence of tree species contributing to the litter mixtures increases mixture effects on decomposition, microcosms were installed in a plantation at sites including the respective tree species composition and in a nearby natural forest where these tree species are absent. We found that mixture decomposition deviated from predictions based on single species, with predominantly synergistic effects. Functional litter diversity, defined as either richness, evenness, or divergence based on a wide range of chemical traits, did not explain the observed litter mixture effects. However, synergistic effects in litter mixtures increased with the long-term presence of tree species contributing to these mixtures as the home field advantage hypothesis assumes. Our data suggest that complementarity effects on mixed litter decomposition may emerge through long-term interactions between aboveground and belowground biota. | ||||
| Address | [Barantal, S; Roy, J; Fromin, N; Hattenschwiler, S] CEFE CNRS, UMR 5175, F-34293 Montpellier 5, France, Email: sandra.barantal@cefe.cnrs.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | Springer | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0029-8549 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | WOS:000293914000024 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 336 | ||
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| Author | Stahl, C.; Herault, B.; Rossi, V.; Burban, B.; Bréchet, C.; Bonal, D. | ||||
| Title | Depth of soil water uptake by tropical rainforest trees during dry periods: Does tree dimension matter? | Type | Journal Article | ||
| Year | 2013 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 173 | Issue | 4 | Pages | 1191-1201 |
| Keywords | Deuterium; Oxygen; Root; Soil water; Tropical rainforest | ||||
| Abstract | Though the root biomass of tropical rainforest trees is concentrated in the upper soil layers, soil water uptake by deep roots has been shown to contribute to tree transpiration. A precise evaluation of the relationship between tree dimensions and depth of water uptake would be useful in tree-based modelling approaches designed to anticipate the response of tropical rainforest ecosystems to future changes in environmental conditions. We used an innovative dual-isotope labelling approach (deuterium in surface soil and oxygen at 120-cm depth) coupled with a modelling approach to investigate the role of tree dimensions in soil water uptake in a tropical rainforest exposed to seasonal drought. We studied 65 trees of varying diameter and height and with a wide range of predawn leaf water potential (Ψpd) values. We confirmed that about half of the studied trees relied on soil water below 100-cm depth during dry periods. Ψpd was negatively correlated with depth of water extraction and can be taken as a rough proxy of this depth. Some trees showed considerable plasticity in their depth of water uptake, exhibiting an efficient adaptive strategy for water and nutrient resource acquisition. We did not find a strong relationship between tree dimensions and depth of water uptake. While tall trees preferentially extract water from layers below 100-cm depth, shorter trees show broad variations in mean depth of water uptake. This precludes the use of tree dimensions to parameterize functional models. © 2013 Springer-Verlag Berlin Heidelberg. | ||||
| Address | INRA, UMR EEF 1137, 54280 Champenoux, France | ||||
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| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 00298549 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 6 December 2013; Source: Scopus; Coden: Oecob; doi: 10.1007/s00442-013-2724-6; Language of Original Document: English; Correspondence Address: Bonal, D.; INRA, UMR EEF 1137, 54280 Champenoux, France; email: bonal@nancy.inra.fr; References: Améglio, T., Archer, P., Cohen, M., Valancogne, C., Daudet, F.A., Dayau, S., Cruiziat, P., Significance and limits in the use of predawn leaf water potential for tree irrigation (1999) Plant Soil, 207, pp. 155-167; Baraloto, C., Morneau, F., Bonal, D., Blanc, L., Ferry, B., Seasonal water stress tolerance and habitat associations within four Neotropical tree genera (2007) Ecology, 88, pp. 478-489; Bonal, D., Barigah, T.S., Granier, A., Guehl, J.-M., Late-stage canopy tree species with extremely low delta C-13 and high stomatal sensitivity to seasonal soil drought in the tropical rainforest of French Guiana (2000) Plant Cell Environ, 23, pp. 445-459; Bonal, D., Atger, C., Barigah, T.S., Ferhi, A., Guehl, J.-M., Ferry, B., Water acquisition patterns of two wet tropical canopy tree species of French Guiana as inferred from H218O extraction profiles (2000) Ann For Sci, 57, pp. 717-724; Bonal, D., Bosc, A., Ponton, S., Goret, J.-Y., Burban, B., Gross, P., Bonnefond, 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; Cao, K.F., Water relations and gas exchange of tropical saplings during a prolonged drought in a Bornean heath forest, with reference to root architecture (2000) J Trop Ecol, 16, pp. 101-116; Carvalheiro, K.O., Nepstad, D.C., Deep soil heterogeneity and fine root distribution in forests and pastures of eastern Amazonia (1996) Plant Soil, 182, pp. 279-285; Chmura, D.J., Anderson, P.D., Howe, G.T., Harrington, C.A., Halofsky, J.E., Peterson, D.L., Shaw, D.C., Brad St Claire, J., Forest responses to climate change in the northwestern United States: ecophysiological foundations for adaptive management (2011) For Ecol Manage, 261, pp. 1121-1142; da Rocha, H.R., Goulden, M.L., Miller, S.D., Menton, M.C., Pinto, L.D.V.O., de Freitas, H.C., e Silva Figueira, A.M., Seasonality of water and heat fluxes over a tropical forest in eastern Amazonia (2004) Ecol Appl, 14, pp. 22-32; Davidson, E., Lefebvre, P.A., Brando, P.M., Ray, D.M., Trumbore, S.E., Solorzano, L.A., Ferreira, J.N., Nepstad, D.C., Carbon inputs and water uptake in deep soils of an eastern Amazon forest (2011) For Sci, 57, pp. 51-58; Engelbrecht, B.M.J., Kursar, T.A., Comparative drought-resistance of seedlings of 28 species of co-occurring tropical woody plants (2003) Oecologia, 136, pp. 383-393; Engelbrecht, B.M.J., Wright, S.J., De Steven, D., Survival and ecophysiology of tree seedlings during El Nino drought in a tropical moist forest in Panama (2002) J Trop Ecol, 18, pp. 569-579; 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; Goulden, M.L., Miller, S.D., da Rocha, H.R., Menton, M.C., De Freitas, H.C., Silva Figueira, A.M.E., De Sousa, C.A.D., Diel and seasonal patterns of tropical forest CO2 exchange (2004) Ecol Appl, 14, pp. 42-54; Gourlet-Fleury, S., Ferry, B., Molino, J.F., Petronelli, P., Schmitt, L., Experimental plots: key features (2004) Ecology and management of a Neotropical Rainforest, pp. 3-60. , In: Gourlet-Fleury S, Guehl JM, Laroussinie O (eds) Lessons drawn from Paracou, a long-term experimental research site in French Guiana. Elsevier, Paris; Huc, R., Ferhi, A., Guehl, J.M., Pioneer and late stage tropical rainforest tree species (French Guyana) growing under common conditions differ in leaf gas exchange regulation, carbon isotope discrimination and leaf water potential (1994) Oecologia, 99, pp. 297-305; Hutyra, L.R., Munger, J.W., Saleska, S., 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, 112, pp. G03008. , doi:10.1029/2006JG000365; Jackson, R.B., Canadell, J., Ehleringer, J.R., Mooney, H.A., Sala, O.E., Schulze, E.D., A global analysis of root distributions for terrestrial biomes (1996) Oecologia, 108, pp. 389-411; Jobbagy, E.G., Jackson, R.B., The distribution of soil nutrients with depth: global patterns and the imprint of plants (2001) Biogeochemistry, 53, pp. 51-77; Kozlowski, T.T., Pallardy, S.G., Acclimation and adaptive responses of woody plants to environmental stresses (2002) Bot Rev, 68, pp. 270-334; Malhi, Y., Wright, J., Spatial patterns and recent trends in the climate of tropical rainforest regions (2004) Phil Trans R Soc Lond B, 359, pp. 311-329; Markewitz, D., Devine, S., Davidson, E.A., Brando, P., Nepstad, D.C., Soil moisture depletion under simulated drought in the Amazon: impacts on deep root uptake (2010) New Phytol, 187, pp. 592-607; Meinzer, F.C., Andrade, J.L., Goldstein, G., Holbrook, N.M., Cavelier, J., Wright, S.J., Partitioning of soil water among trees in a seasonally dry tropical forest (1999) Oecologia, 121, pp. 293-301; Merbold, L., Ardo, J., Arneth, A., Scholes, R.J., Nouvellon, Y., de Grandcourt, A., Archibald, S., Kutsch, W.L., Precipitation as driver of carbon fluxes in 11 African ecosystems (2009) Biogeosciences, 6, pp. 1027-1041; Moreira, M., Sternberg, L., Nepstad, D., Vertical patterns of soil water uptake by plants in a primary forest and an abandoned pasture in the eastern Amazon: an isotopic approach (2000) Plant Soil, 222, pp. 95-107; Nepstad, D.C., De Carvalho, C.R., Davidson, E.A., Jipp, P.H., Lefebvre, P.A., Negreiros, G.H., Da Silva, E.D., Vieira, S., The role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures (1994) Nature, 372, pp. 666-669; Oliveira, R., Dawson, T., Burgess, S., Nepstad, D., Hydraulic redistribution in three Amazonian trees (2005) Oecologia, 145, pp. 354-363; Poorter, L., Markesteijn, L., Seedling traits determine drought tolerance of tropical tree species (2008) Biotropica, 40, pp. 321-331; (2010) R: A Language and Environment for Statistical Computing, , R Development Core Team, Vienna: R Foundation for Statistical Computing; Romero-Saltos, H., LdSL, S., Moreira, M.Z., Nepstad, D.C., Rainfall exclusion in an eastern Amazonian forest alters soil water movement and depth of water uptake (2005) Am J Bot, 92, pp. 443-455; Sobrado, M.A., Embolism vulnerability in drought-deciduous and evergreen species of a tropical dry forest (1997) Acta Oecol, 18, pp. 383-391; Stahl, C., Burban, B., Bompy, F., Jolin, Z.B., Sermage, J., Bonal, D., Seasonal variation in atmospheric relative humidity contributes to explaining seasonal variation in trunk circumference of tropical rain-forest trees in French Guiana (2010) J Trop Ecol, 26, pp. 393-405; Stahl, C., Burban, B., Goret, J.-Y., Bonal, D., Seasonal variations in stem CO2 efflux in the Neotropical rainforest of French Guiana (2011) Ann For Sci, 68, pp. 771-782; Stahl, C., Burban, B., Wagner, F., Goret, J.-Y., Bompy, F., Bonal, D., Influence of seasonal variations in soil water availability on gas exchange of tropical canopy trees (2013) Biotropia, 45, pp. 155-164; Sternberg, L., Green, L., Moreira, M.Z., Nepstad, D.C., Martinelli, L.A., Victoria, R., Root distribution in an Amazonian seasonal forest (1998) Plant Soil, 205, pp. 45-50; Sternberg, L., Moreira, M., Nepstad, D.C., Uptake of water by lateral roots of small trees in an Amazonian tropical forest (2002) Plant Soil, 238, pp. 151-158; Wagner, F., Hérault, B., Stahl, C., Bonal, D., Rossi, V., Modeling water availability for trees in tropical forests (2011) Agric For Meteorol, 151, pp. 1202-1213; Wagner, F., Rossi, V., Stahl, C., Bonal, D., Hérault, B., Water availability is the main climate driver of Neotropical tree growth (2012) PLoS ONE, 7, pp. e34074; Wang, G., Alo, C., Mei, R., Sun, S., Droughts, hydraulic redistribution, and their impact on vegetation composition in the Amazon forest (2011) Plant Ecol, 212, pp. 663-673; Williams, M., Malhi, Y., Nobre, A.D., Rastetter, E.B., Grace, J., Pereira, M.G.P., Seasonal variation in net carbon exchange and evapotranspiration in a Brazilian rainforest: a modelling analysis (1998) Plant Cell Environ, 21, pp. 953-968; Yavitt, J.B., Wright, S.J., Drought and irrigation effects on fine root dynamics in a tropical moist forest, Panama (2001) Biotropica, 33, pp. 421-434; Zapater, M., Hossann, C., Bréda, N., Bréchet, C., Bonal, D., Granier, A., Evidence of hydraulic lift in a young beech and oak mixed forest using 18O soil water labelling (2011) Trees Struct Funct, 25, pp. 885-894; Zhang, Y., Tan, Z., Song, Q., Yu, G., Sun, X., Respiration controls the unexpected seasonal pattern of carbon flux in an Asian tropical rain forest (2010) Atmos Environ, 44, pp. 3886-3893 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 514 | ||
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| Author | Salas-Lopez, A.; Mickal, H.; Menzel, F.; Orivel, J. | ||||
| Title | Ant-mediated ecosystem processes are driven by trophic community structure but mainly by the environment | Type | Journal Article | ||
| Year | 2017 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 183 | Issue | 1 | Pages | 249-261 |
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| Abstract | The diversity and functional identity of organisms are known to be relevant to the maintenance of ecosystem processes but can be variable in different environments. Particularly, it is uncertain whether ecosystem processes are driven by complementary effects or by dominant groups of species. We investigated how community structure (i.e., the diversity and relative abundance of biological entities) explains the community-level contribution of Neotropical ant communities to different ecosystem processes in different environments. Ants were attracted with food resources representing six ant-mediated ecosystem processes in four environments: ground and vegetation strata in cropland and forest habitats. The exploitation frequencies of the baits were used to calculate the taxonomic and trophic structures of ant communities and their contribution to ecosystem processes considered individually or in combination (i.e., multifunctionality). We then investigated whether community structure variables could predict ecosystem processes and whether such relationships were affected by the environment. We found that forests presented a greater biodiversity and trophic complementarity and lower dominance than croplands, but this did not affect ecosystem processes. In contrast, trophic complementarity was greater on the ground than on vegetation and was followed by greater resource exploitation levels. Although ant participation in ecosystem processes can be predicted by means of trophic-based indices, we found that variations in community structure and performance in ecosystem processes were best explained by environment. We conclude that determining the extent to which the dominance and complementarity of communities affect ecosystem processes in different environments requires a better understanding of resource availability to different species. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1432-1939 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ Salas-Lopez2017 | Serial | 715 | ||
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| Author | Fichaux, M.; Béchade, B.; Donald, J.; Weyna, A.; Delabie, J.H.C.; Murienne, J.; Baraloto, C.; Orivel, J. | ||||
| Title | Habitats shape taxonomic and functional composition of Neotropical ant assemblages | Type | Journal Article | ||
| Year | 2019 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 189 | Issue | 2 | Pages | 501-513 |
| Keywords | Formicidae; Functional diversity; Habitat filtering; Rainforest; Traits; Formicidae | ||||
| Abstract | Determining assembly rules of co-occurring species persists as a fundamental goal in community ecology. At local scales, the relative importance of environmental filtering vs. competitive exclusion remains a subject of debate. In this study, we assessed the relative importance of habitat filtering and competition in structuring understory ant communities in tropical forests of French Guiana. Leaf-litter ants were collected using pitfall and Winkler traps across swamp, slope and plateau forests near Saül, French Guiana. We used a combination of univariate and multivariate analyses to evaluate trait response of ants to habitat characteristics. Null model analyses were used to investigate the effects of habitat filtering and competitive interactions on community assembly at the scale of assemblages and sampling points, respectively. Swamp forests presented a much lower taxonomic and functional richness compared to slope and plateau forests. Furthermore, marked differences in taxonomic and functional composition were observed between swamp forests and slope or plateau forests. We found weak evidence for competitive exclusion based on null models. Nevertheless, the contrasting trait composition observed between habitats revealed differences in the ecological attributes of the species in the different forest habitats. Our analyses suggest that competitive interactions may not play an important role in structuring leaf-litter ant assemblages locally. Rather, habitats are responsible for driving both taxonomic and functional composition of ant communities. | ||||
| Address | International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL 33199, United States | ||||
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| Publisher | Springer Verlag | Place of Publication | Editor | ||
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| ISSN | 00298549 (Issn) | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 863 | ||
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| Author | Grossiord, C.; Christoffersen, B.; Alonso-Rodríguez, A.M.; Anderson-Teixeira, K.; Asbjornsen, H.; Aparecido, L.M.T.; Carter Berry, Z.; Baraloto, C.; Bonal, D.; Borrego, I.; Burban, B.; Chambers, J.Q.; Christianson, D.S.; Detto, M.; Faybishenko, B.; Fontes, C.G.; Fortunel, C.; Gimenez, B.O.; Jardine, K.J.; Kueppers, L.; Miller, G.R.; Moore, G.W.; Negron-Juarez, R.; Stahl, C.; Swenson, N.G.; Trotsiuk, V.; Varadharajan, C.; Warren, J.M.; Wolfe, B.T.; Wei, L.; Wood, T.E.; Xu, C.; McDowell, N.G. | ||||
| Title | Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics | Type | Journal Article | ||
| Year | 2019 | Publication | Oecologia | Abbreviated Journal |
Oecologia |
| Volume | 191 | Issue | 3 | Pages | 519-530 |
| Keywords | Evapotranspiration; Plant functional traits; Transpiration; Vapor pressure deficit; drought; evapotranspiration; flux measurement; hydrological cycle; Neotropical Region; precipitation (chemistry); precipitation (climatology); tree; tropical forest; tropical region; vapor pressure; water; drought; evapotranspiration; forest; tree; vapor pressure; Droughts; Forests; Plant Transpiration; Trees; Vapor Pressure; Water | ||||
| Abstract | Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime [mean annual precipitation (MAP); seasonal drought intensity (PDRY)] and two functional traits related to foliar and wood economics spectra [leaf mass per area (LMA); wood specific gravity (WSG)]. We show that, even though vmax is highly variable within sites, it follows a negative trend in response to increasing MAP and PDRY across sites. LMA and WSG exerted little effect on vmax and VPDmax, suggesting that these widely used functional traits provide limited explanatory power of dynamic plant responses to environmental variation within hyper-diverse forests. This study demonstrates that long-term precipitation plays an important role in the sap flux response of humid tropical forests to VPD. Our findings suggest that under higher evaporative demand, trees growing in wetter environments in humid tropical regions may be subjected to reduced water exchange with the atmosphere relative to trees growing in drier climates. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. | ||||
| Address | Earth Systems Science Division, Pacific Northwest National Laboratory, Richland, WA, United States | ||||
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| Publisher | Springer Verlag | Place of Publication | Editor | ||
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| ISSN | 00298549 (Issn) | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 904 | ||
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| Author | Chang, S.-S.; Quignard, F.; Alméras, T.; Clair, B. | ||||
| Title | Mesoporosity changes from cambium to mature tension wood: A new step toward the understanding of maturation stress generation in trees | Type | Journal Article | ||
| Year | 2015 | Publication | New Phytologist | Abbreviated Journal |
New Phytologist |
| Volume | 205 | Issue | 3 | Pages | 1277-1287 |
| Keywords | Cell wall maturation; Maturation stress; Mesoporosity; Poplar (Populus deltoides × P. nigra); Tension wood | ||||
| Abstract | In order to progress in the understanding of mechanical stress generation, the mesoporosity of the cell wall and its changes during maturation of poplar (Populus deltoides × P. nigra) tension wood (TW) and opposite wood (OW) were measured by nitrogen adsorption-desorption. Variations in the thickness of the gelatinous layer (G-layer) were also measured to clarify whether the mesoporosity change simultaneously with the deposition of the G-layer in TW. Results show that mesoporous structures of TW and OW were very similar in early development stages before the deposition of G-layers. With the formation of the S2 layer in OW and the G-layer in TW, the mesopore volume decreased steeply before lignification. However, in TW only, the decrease in mesopore volume occurred together with the pore shape change and a progressive increase in pore size. The different patterns observed in TW revealed that pores from G-layers appear with a different shape compared to those of the compound middle lamella, and their size increases during the maturation process until stabilising in mature wood. This observation strongly supports the hypothesis of the swelling of the G-layer matrix during maturation as the origin of maturation stress in poplar tension wood. | ||||
| Address | CNRS, UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 701Kourou, France | ||||
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| Notes | Export Date: 28 January 2015 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 581 | ||
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| Author | Martos, F.; Dulormne, M.; Pailler, T.; Bonfante, P.; Faccio, A.; Fournel, J.; Dubois, M.-P.; Selosse, M.-A. | ||||
| Title | Independent recruitment of saprotrophic fungi as mycorrhizal partners by tropical achlorophyllous orchids | Type | Journal Article | ||
| Year | 2009 | Publication | New Phytologist | Abbreviated Journal |
New Phytologist |
| Volume | 184 | Issue | 3 | Pages | 668-681 |
| Keywords | Mycoheterotrophy; Mycorrhizas; Orchids; Rainforests; Saprotrophic fungi; Stable isotopes | ||||
| Abstract | Mycoheterotrophic orchids have adapted to shaded forest understory by shifting to achlorophylly and receiving carbon from their mycorrhizal fungi. In temperate forests, they associate in a highly specific way with fungi forming ectomycorrhizas on nearby trees, and exploiting tree photosynthates. However, many rainforests lack ectomycorrhizal fungi, and there is evidence that some tropical Asiatic species associate with saprotrophic fungi. To investigate this in different geographic and phylogenetic contexts, we identified the mycorrhizal fungi supporting two tropical mycoheterotrophic orchids from Mascarene (Indian Ocean) and Caribbean islands. We tested their possible carbon sources by measuring natural nitrogen (15N) and carbon (13C) abundances. Saprotrophic basidiomycetes were found: Gastrodia similis associates with a wood-decaying Resinicium (Hymenochaetales); Wullschlaegelia aphylla associates with both litter-decaying Gymnopus and Mycena species, whose rhizomorphs link orchid roots to leaf litter. The 15N and 13C abundances make plausible food chains from dead wood to G. similis and from dead leaves to W. aphylla. We propose that temperature and moisture in rainforests, but not in most temperate forests, may favour sufficient saprotrophic activity to support development of mycoheterotrophs. By enlarging the spectrum of mycorrhizal fungi and the level of specificity in mycoheterotrophic orchids, this study provides new insights on orchid and mycorrhizal biology in the tropics. © 2009 New Phytologist. | ||||
| Address | Dipartimento di Biologia Vegetale dell'Università, Istituto per la Protezione Delle Piante – CNR, Viale Mattioli 25, I-10125 Torino, Italy | ||||
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| Notes | Cited By :65; Export Date: 7 February 2017 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 728 | ||
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| Author | Roy, M.; Vasco-Palacios, A.; Geml, J.; Buyck, B.; Delgat, L.; Giachini, A.; Grebenc, T.; Harrower, E.; Kuhar, F.; Magnago, A.; Rinaldi, A.C.; Schimann, H.; Selosse, M.-A.; Sulzbacher, M.A.; Wartchow, F.; Neves, M.-A. | ||||
| Title | The (re)discovery of ectomycorrhizal symbioses in Neotropical ecosystems sketched in Florianópolis | Type | Journal Article | ||
| Year | 2017 | Publication | New Phytologist | Abbreviated Journal |
New Phytologist |
| Volume | 214 | Issue | 3 | Pages | 920-923 |
| Keywords | barcoding; biodiversity; ectomycorrhizal fungi; ectomycorrhizal roots; ectomycorrhizal symbioses; fruitbodies; Neotropical ecosystems | ||||
| Abstract | |||||
| Address | Departamento de Sistemática e Ecologia/CCEN, Laboratório de Morfo-Taxonomia Fúngica, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil | ||||
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| Notes | Cited By :1; Export Date: 23 April 2017 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 749 | ||
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