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| Author | Duplais, C.; Papon, N.; Courdavault, V. | ||||
Title  |
Tracking the Origin and Evolution of Plant Metabolites | Type | Journal Article | ||
| Year | 2020 | Publication | Trends in Plant Science | Abbreviated Journal | Trends Plant Sci. |
| Volume | 25 | Issue | 12 | Pages | 1182-1184 |
| Keywords | enzyme evolution; iridoids; Lamiaceae; nepetalactone; plant metabolites | ||||
| Abstract | Iridoids are monoterpenes that are produced by various plants as chemical defense molecules. Lichman et al. recently described the timeline of molecular events that underpin the re-emergence of iridoid biosynthesis in an independent lineage of aromatic plants (catnip). This study represents a benchmark for studying enzyme and metabolite evolution in different clades across the tree of life. © 2020 Elsevier Ltd | ||||
| Address | Biomolécules et Biotechnologies Végétales (BBV) EA 2106, Université de Tours, Tours, France | ||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier Ltd | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 13601385 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 937 | ||
| Permanent link to this record | |||||
| Author | Dutech, C.; Maggia, L.; Tardy, C.; Joly, H.I.; Jarne, P. | ||||
| Title |
Tracking a genetic signal of extinction-recolonization events in a neotropical tree species: Vouacapoua americana aublet in french guiana | Type | Journal Article | ||
| Year | 2003 | Publication | Evolution | Abbreviated Journal | Evolution |
| Volume | 57 | Issue | 12 | Pages | 2753-2764 |
| Keywords | allelic richness; caesalpinioideae; chloroplast DNA; climatic changes; cytonuclear disequilibrium; legummosae; microsatellite loci; tropical rainforest | ||||
| Abstract | Drier periods from the late Pleistocene and early Holocene have been hypothesized to have caused the disappearance of various rainforest species over large geographical areas in South America and restricted the extant populations to mesic sites. Subsequent improvement in climatic conditions has been associated with recolonization. Changes in population size associated with these extinction-recolonization events should have affected genetic diversity within species. However, these historical hypotheses and their genetic consequences have rarely been tested in South America. Here, we examine the diversity of the chloroplast and nuclear genomes in a Neotropical rainforest tree species, Vouacapoua americana (Leguminosae, Caesalpinioideae) in French Guiana. The chloroplast diversity was analyzed using a polymerase chain reaction-restriction fragment length polymorphism method (six pairs of primers) in 29 populations distributed over most of French Guiana, and a subset of 17 populations was also analyzed at nine polymorphic microsatellite loci. To determine whether this species has experienced extinction-recolonization, we sampled populations in areas supposedly not or only slightly affected by climatic changes, where the populations would not have experienced frequent extinction, and in areas that appear to have been recently recolonized. In the putatively recolonized areas, we found patches of several thousands of hectares homogeneous for chloroplast variation that can be interpreted as the effect of recolonization processes from several geographical origins. In addition, we observed that, for both chloroplast and nuclear genomes, the populations in newly recolonized areas exhibited a significantly smaller allelic richness than others. Controlling for geographic distance, we also detected a significant correlation between chloroplast and nuclear population differentiation. This result indicates a cytonuclear disequilibrium that can be interpreted as a historical signal of a genetic divergence between fragmented populations. In conclusion, the spatial genetic structure of contemporary V. americana populations shows evidence that this species has experienced large extinction-recolonization events, which were possibly caused by past climatic change. | ||||
| Address | CIRAD Foret, Silvolab, Ecol Mol, F-97387 Kourou, France, Email: laruent.maggia@cirad.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | SOC STUDY EVOLUTION | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0014-3820 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000188061800007 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 241 | ||
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| Author | Prunier, J.; Maurice, L.; Perez, E.; Gigault, J.; Pierson Wickmann, A.-C.; Davranche, M.; Halle, A.T. | ||||
| Title |
Trace metals in polyethylene debris from the North Atlantic subtropical gyre | Type | Journal Article | ||
| Year | 2019 | Publication | Environmental Pollution | Abbreviated Journal | Environ. Pollut. |
| Volume | 245 | Issue | Pages | 371-379 | |
| Keywords | metals'accumulation; Microplastic; Plastic debris; Polyethylene; Polymer | ||||
| Abstract | Plastic pollution in the marine environment poses threats to wildlife and habitats through varied mechanisms, among which are the transport and transfer to the food web of hazardous substances. Still, very little is known about the metal content of plastic debris and about sorption/desorption processes, especially with respect to weathering. In this study, plastic debris collected from the North Atlantic subtropical gyre was analyzed for trace metals; as a comparison, new packaging materials were also analyzed. Both the new items and plastic debris showed very scattered concentrations. The new items contained significant amounts of trace metals introduced as additives, but globally, metal concentrations were higher in the plastic debris. The results provide evidence that enhanced metal concentrations increase with the plastic state of oxidation for some elements, such as As, Ti, Ni, and Cd. Transmission electron microscopy showed the presence of mineral particles on the surface of the plastic debris. This work demonstrates that marine plastic debris carries complex mixtures of heavy metals. Such materials not only behave as a source of metals resulting from intrinsic plastic additives but also are able to concentrate metals from ocean water as mineral nanoparticles or adsorbed species. Plastic debris collected from the North Atlantic subtropical gyre was analyzed for trace metals. Marine plastic debris carry complex mixtures of heavy metals but it is evidence that plastic oxidation favors their adsorption. | ||||
| Address | Univ Rennes, Geosciences, UMR CNRS 6118, bat 15, Campus de Beaulieu, Rennes Cedex, 35042, France | ||||
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| Publisher | Elsevier Ltd | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| ISSN | 02697491 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 3 December 2018; Coden: Enpoe; Correspondence Address: Halle, A.T.; Laboratoire des IMRCP, Université de Toulouse, CNRS UMR 5623, Université Toulouse III – Paul Sabatier, 118 route de Narbonne, Cedex 09, France; email: ter-halle@chimie.ups-tlse.fr; References: Al-Sid-Cheikh, M., Pedrot, M., Dia, A., Guenet, H., Vantelon, D., Davranche, M., Gruau, G., Delhaye, T., Interactions between natural organic matter, sulfur, arsenic and iron oxides in re-oxidation compounds within riparian wetlands: NanoSIMS and X-ray adsorption spectroscopy evidences (2015) Sci. Total Environ., 515, pp. 118-128; Anderson, A., Andrady, A., Hidalgo-Ruz, V., Kershaw, P.J., Sources, Fate and Effects of Microplastics in the Marine Environment: a Global Assessment; GESAMP Joint Group of Expertts on the Scientific Aspects of Marine Environmental Protection (2015); Ashton, K., Holmes, L., Turner, A., Association of metals with plastic production pellets in the marine environment (2010) Mar. Pollut. Bull., 60, pp. 2050-2055; Bakir, A., Rowland, S.J., Thompson, R.C., Transport of persistent organic pollutants by microplastics in estuarine conditions (2014) Estuar. Coast Shelf Sci., 140, pp. 14-21; Belzile, N., Devitre, R.R., Tessier, A., Insitu collection of diagenetic iron and manganese oxyhydroxides from natural sediments (1989) Nature, 340, pp. 376-377; Brennecke, D., Duarte, B., Paiva, F., Cacador, I., Canning-Clode, J., Microplastics as vector for heavy metal contamination from the marine environment (2016) Estuar. Coast Shelf Sci., 178, pp. 189-195; Bylan, C., (2003) Developments in Colorants for Plastics, 14, p. 85; Carlton, J.T., Chapman, J.W., Geller, J.B., Miller, J.A., Carlton, D.A., McCuller, M.I., Treneman, N.C., Ruiz, G.M., Tsunami-driven rafting: transoceanic species dispersal and implications for marine biogeography (2017) Science, 357, pp. 1402-1405; Cordeiro, F., Baer, I., Robouch, P., Emteborg, H., C.-G, J., Korsten, B., d. l. C, B., IMEP-34: Heavy Metals in Toys According to EN 71-3:1994 (2012), JCR Luxembourg p 58pp; Eerkes-Medrano, D., Thompson, R.C., Aldridge, D.C., Microplastics in freshwater systems: a review of the emerging threats, identification of knowledge gaps and prioritisation of research needs (2015) Water Res., 75, pp. 63-82; (2004) Emission Scenario Document on Plastic Additives, , OECD Environmental Health and Safety Publications Paris; Engler, R.E., The complex interaction between marine debris and toxic chemicals in the ocean (2012) Environ. Sci. Technol., 46, pp. 12302-12315; Eriksen, M., Mason, S., Wilson, S., Box, C., Zellers, A., Edwards, W., Farley, H., Amato, S., Microplastic pollution in the surface waters of the laurentian great lakes (2013) Mar. Pollut. Bull., 77, pp. 177-182; Fakih, M., Davranche, M., Dia, A., Nowack, B., Petitjean, P., Chatellier, X., Gruau, G., A new tool for in situ monitoring of Fe-mobilization in soils (2008) Appl. Geochem., 23, pp. 3372-3383; Gall, S.C., Thompson, R.C., The impact of debris on marine life (2015) Mar. Pollut. Bull., 92, pp. 170-179; Goldstein, M.C., Carson, H.S., Eriksen, M., Relationship of diversity and habitat area in North Pacific plastic-associated rafting communities (2014) Mar. Biol., 161, pp. 1441-1453; Hansen, E., Nilsson, N.H., Lithner, D., Lassen, C., Hazardous Substances in Plastic Materials, COWI and the Danish Technological Institute on Behalf of Thr Norwegian Climate and Pollution Agency. In Oslo (2010), p 150 pp; (2013) Hazardous Substances in Plastic Materials, , COWI Danish Technological Institute; Hirai, H., Takada, H., Ogata, Y., Yamashita, R., Mizukawa, K., Saha, M., Kwan, C., Ward, M.W., Organic micropollutants in marine plastics debris from the open ocean and remote and urban beaches (2011) Mar. Pollut. Bull., 62, pp. 1683-1692; Holmes, L.A., Turner, A., Thompson, R.C., Adsorption of trace metals to plastic resin pellets in the marine environment (2012) Environ. Pollut., 160, pp. 42-48; Holmes, L.A., Turner, A., Thompson, R.C., Interactions between trace metals and plastic production pellets under estuarine conditions (2014) Mar. Chem., 167, pp. 25-32; Imhof, H.K., Laforsch, C., Wiesheu, A.C., Schmid, J., Anger, P.M., Niessner, R., Ivleva, N.P., Pigments and plastic in limnetic ecosystems: a qualitative and quantitative study on microparticles of different size classes (2016) Water Res., 98, pp. 64-74; Jiao, W.T., Chen, W.P., Chang, A.C., Page, A.L., Environmental risks of trace elements associated with long-term phosphate fertilizers applications: a review (2012) Environ. Pollut., 168, pp. 44-53; Lavers, J.L., Bond, A.L., Ingested plastic as a route for trace metals in laysan albatross (phoebastria immutabilis) and bonin petrel (pterodroma hypoleuca) from midway atoll (2016) Mar. Pollut. Bull., 110, pp. 493-500; Law, K.L., Moret-Ferguson, S.E., Goodwin, D.S., Zettler, E.R., De Force, E., Kukulka, T., Proskurowski, G., Distribution of surface plastic debris in the eastern pacific ocean from an 11-year data set (2014) Environ. Sci. Technol., 48, pp. 4732-4738; Lazzeria, A., Zebarjadb, S.M., Parcellac, M., Cavalierd, K., Rosam, R., Filler toughening of plastics. Part 1-The effect of surface interactions on physico-mechanical properties and rheological behaviour of ultrafine CaCO3/HDPE nanocomposites (2005) Polymer, 46, pp. 827-844; Lithner, D., Larsson, A., Dave, G., Environmental and health hazard ranking and assessment of plastic polymers based on chemical composition (2011) Sci. Total Environ., 409, pp. 3309-3324; Marier, C., Calafut, C., Polypropylene: the Definitive User's Guide and Databook. Norwich NY (1998); Massos, A., Turner, A., Cadmium, lead and bromine in beached microplastics (2017) Environ. Pollut., 227, pp. 139-145; Moret-Ferguson, S., Law, K.L., Proskurowski, G., Murphy, E.K., Peacock, E.E., Reddy, C.M., The size, mass, and composition of plastic debris in the western North Atlantic Ocean (2010) Mar. Pollut. Bull., 60, pp. 1873-1878; Murphy, J., Additives for Plastic Handbook (2003), Elsevier Advanced Technology Oxford, UK; Nziguheba, G., Smolders, E., Inputs of trace elements in agricultural soils via phosphate fertilizers in European countries (2008) Sci. Total Environ., 390, pp. 53-57; Rizzotto, M., Chapter 5 Metal complexes as antimicrobial agents (2012) A Search for Antibacterial Agents, p. 73. , V. Bobbarala; Rochman, C.M., Browne, M.A., Halpern, B.S., Hentschel, B.T., Hoh, E., Karapanagioti, H.K., Rios-Mendoza, L.M., Thompson, R.C., Classify plastic waste as hazardous (2013) Nature, 494, pp. 169-171; Rochman, C.M., Hoh, E., Hentschel, B.T., Kaye, S., Long-term field measurement of sorption of organic contaminants to five types of plastic pellets: implications for plastic marine debris (2013) Environ. Sci. Technol., 47, pp. 1646-1654; Rochman, C.M., Kurobe, T., Flores, I., Teh, S.J., Early warning signs of endocrine disruption in adult fish from the ingestion of polyethylene with and without sorbed chemical pollutants from the marine environment (2014) Sci. Total Environ., 493, pp. 656-661; Rochman, C.M., Hentschel, B.T., Teh, S.J., Long-term sorption of metals is similar among plastic types: implications for plastic debris in aquatic environments (2014) PLoS One, 9; RoHS, Restriction of Hazardous Substances, Eu Directive 2002/95/EC (2006), http://www.rohsguide.com/rohs-substances.htm; Schlining, K., von Thun, S., Kuhnz, L., Schlining, B., Lundsten, L., Stout, N.J., Chaney, L., Connor, J., Debris in the deep: using a 22-year video annotation database to survey marine litter in Monterey Canyon, central California, USA (2013) Deep Sea Res. Part 1 Oceanogr. Res. Pap., 79, pp. 96-105; Tanaka, K., Takada, H., Yamashita, R., Mizukawa, K., Fukuwaka, M., Watanuki, Y., Accumulation of plastic-derived chemicals in tissues of seabirds ingesting marine plastics (2013) Mar. Pollut. Bull., 69, pp. 219-222; ter Halle, A., Ladirat, L., Gendre, X., Goudouneche, D., Pusineri, C., Routaboul, C., Tenailleau, C., Perez, E., Understanding the fragmentation pattern of marine plastic debris (2016) Environ. Sci. Technol., 50, pp. 5668-5675; Ter Halle, A., Ladirat, L., Martignac, M., Mingotaud, A.F., Boyron, O., Perez, E., To what extent are microplastics from the open ocean weathered? (2017) Environ. Pollut., 227, pp. 167-174; Turner, A., Heavy metals, metalloids and other hazardous elements in marine plastic litter (2016) Mar. Pollut. Bull., 111, pp. 136-142; Turner, A., Trace elements in fragments of fishing net and other filamentous plastic litter from two beaches in SW England (2017) Environ. Pollut., 224, pp. 722-728; Turner, A., Concentrations and migratabilities of hazardous elements in second-hand children's plastic toys (2018) Environ. Sci. Technol., 52, pp. 3110-3116; Turner, A., Mobilisation kinetics of hazardous elements in marine plastics subject to an avian physiologically-based extraction test (2018) Environ. Pollut., 236, pp. 1020-1026; Turner, A., Solman, K.R., Analysis of the elemental composition of marine litter by field-portable-XRF (2016) Talanta, 159, pp. 262-271; Wang, J.D., Peng, J.P., Tan, Z., Gao, Y.F., Zhan, Z.W., Chen, Q.Q., Cai, L.Q., Microplastics in the surface sediments from the Beijiang River littoral zone: composition, abundance, surface textures and interaction with heavy metals (2017) Chemosphere, 171, pp. 248-258; Wardrop, P., Shimeta, J., Nugegoda, D., Morrison, P.D., Miranda, A., Tang, M., Clarke, B.O., Chemical pollutants sorbed to ingested microbeads from personal care products accumulate in fish (2016) Environ. Sci. Technol., 50, pp. 4037-4044; Wright, S.L., Thompson, R.C., Galloway, T.S., The physical impacts of microplastics on marine organisms: a review (2013) Environ. Pollut., 178, pp. 483-492; Zettler, E.R., Mincer, T.J., Amaral-Zettler, L.A., Life in the “plastisphere”: microbial communities on plastic marine debris (2013) Environ. Sci. Technol., 47, pp. 7137-7146 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 840 | ||
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| Author | Falkowski, M.; Jahn-Oyac, A.; Odonne, G.; Flora, C.; Estevez, Y.; Touré, S.; Boulogne, I.; Robinson, J.-C.; Béreau, D.; Petit, P.; Azam, D.; Coke, M.; Issaly, J.; Gaborit, P.; Stien, D.; Eparvier, V.; Dusfour, I.; Houël, E. | ||||
| Title |
Towards the optimization of botanical insecticides research: Aedes aegypti larvicidal natural products in French Guiana | Type | Journal Article | ||
| Year | 2020 | Publication | Acta Tropica | Abbreviated Journal | |
| Volume | 201 | Issue | 105179 | Pages | |
| Keywords | Amazonian chemodiversity; Chemical defense; Culicidae; Mosquito larvicides; Quasi-Poisson generalized linear model; Screening optimization | ||||
| Abstract | Natural products have proven to be an immeasurable source of bioactive compounds. The exceptional biodiversity encountered in Amazonia, alongside a rich entomofauna and frequent interactions with various herbivores is the crucible of a promising chemodiversity. This prompted us to search for novel botanical insecticides in French Guiana. As this French overseas department faces severe issues linked to insects, notably the strong incidence of vector-borne infectious diseases, we decided to focus our research on products able to control the mosquito Aedes aegypti. We tested 452 extracts obtained from 85 species originating from 36 botanical families and collected in contrasted environments against an Ae. aegypti laboratory strain susceptible to all insecticides, and a natural population resistant to both pyrethroid and organophosphate insecticides collected in Cayenne for the most active of them. Eight species (Maytenus oblongata Reissek, Celastraceae; Costus erythrothyrsus Loes., Costaceae; Humiria balsamifera Aubl., Humiriaceae; Sextonia rubra (Mez) van der Werff, Lauraceae; Piper hispidum Sw., Piperaceae; Laetia procera (Poepp.) Eichl., Salicaceae; Matayba arborescens (Aubl.) Radlk., Sapindaceae; and Cupania scrobitulata Rich., Sapindaceae) led to extracts exhibiting more than 50% larval mortality after 48 h of exposition at 100 µg/mL against the natural population and were considered active. Selectivity and phytochemistry of these extracts were therefore investigated and discussed, and some active compounds highlighted. Multivariate analysis highlighted that solvents, plant tissues, plant family and location had a significant effect on mortality while light, available resources and vegetation type did not. Through this case study we highlighted that plant defensive chemistry mechanisms are crucial while searching for novel insecticidal products. | ||||
| Address | INRS-Institut Armand Frappier, Groupe recherche en écologie microbienne, 531 boulevard des prairies, Laval, QC H7V 1B7, Canada | ||||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 888 | ||
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| Author | Sist, P.; Fimbel, R.; Sheil, D.; Nasi, R.; Chevallier, M.H. | ||||
| Title |
Towards sustainable management of mixed dipterocarp forests of South-east Asia: moving beyond minimum diameter cutting limits | Type | Journal Article | ||
| Year | 2003 | Publication | Environmental Conservation | Abbreviated Journal | |
| Volume | 30 | Issue | 4 | Pages | 364-374 |
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| Abstract | Selective logging applied in tropical forests is based on one universal criterion: a minimum diameter cutting limit for all commercial timber species. Minimum diameter cutting limits in mixed dipterocarp forests of the Malesia region lead to high felling intensities (10-20+ trees ha(-1)). Such extraction rates create massive stand damage (> 50% of the remaining tree population), which has a negative impact on the regeneration and growth of many harvested dipterocarp, species. As such, the minimum diameter cutting limit approach is seldom compatible with sustainable forest management. Where basic ecological characteristics of the commercial species are considered in timber harvesting prescriptions, mixed dipterocarp, forests appear capable of sustained timber yields, habitat conservation, and providing other goods and services. This paper first presents the main silvicultural systems developed in mixed dipterocarp, forests of Western Malesia and then reviews current knowledge of dipterocarp, biology to finally develop guidelines aimed at improving the ecological sustainability of production forests of Western Malesia. These guidelines, a pragmatic reflection of science and 'best guess' judgement, include: (1) integration of reduced-impact logging practices into normal management operations; (2) cutting of eight trees ha(-1) or less (with a felling cycle of 40-60 years to be determined according to local conditions); (3) defining minimum diameter cutting limits according to the structure, density and diameter at reproduction of target species; (4) avoiding harvesting species with less than one adult tree ha(-1) (diameter at breast height [dbh] greater than or equal to 50 cm over an area of 50-100 ha); (5) minimizing the size and connectivity of gaps (< 600 m(2) whenever possible); (6) refraining from treatments such as understorey clearing; and (7) providing explicit protection for key forest species and the ecological processes they perform. Further refinement is encouraged to allow for local conditions, and for other forest types. | ||||
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| ISSN | 0376-8929 | ISBN | Medium | ||
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| Notes | WOS:000188812100007 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 309 | ||
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| Author | Aubry-Kientz, M.; Herault, B.; Ayotte-Trépanier, C.; Baraloto, C.; Rossi, V. | ||||
| Title |
Toward Trait-Based Mortality Models for Tropical Forests | Type | Journal Article | ||
| Year | 2013 | Publication | PLoS ONE | Abbreviated Journal | PLoS ONE |
| Volume | 8 | Issue | 5 | Pages | e63678 |
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| Abstract | Tree mortality in tropical forests is a complex ecological process for which modelling approaches need to be improved to better understand, and then predict, the evolution of tree mortality in response to global change. The mortality model introduced here computes an individual probability of dying for each tree in a community. The mortality model uses the ontogenetic stage of the tree because youngest and oldest trees are more likely to die. Functional traits are integrated as proxies of the ecological strategies of the trees to permit generalization among all species in the community. Data used to parametrize the model were collected at Paracou study site, a tropical rain forest in French Guiana, where 20,408 trees have been censused for 18 years. A Bayesian framework was used to select useful covariates and to estimate the model parameters. This framework was developed to deal with sources of uncertainty, including the complexity of the mortality process itself and the field data, especially historical data for which taxonomic determinations were uncertain. Uncertainty about the functional traits was also considered, to maximize the information they contain. Four functional traits were strong predictors of tree mortality: wood density, maximum height, laminar toughness and stem and branch orientation, which together distinguished the light-demanding, fast-growing trees from slow-growing trees with lower mortality rates. Our modelling approach formalizes a complex ecological problem and offers a relevant mathematical framework for tropical ecologists to process similar uncertain data at the community level. © 2013 Aubry-Kientz et al. | ||||
| Address | INRA, UMR 'Ecologie des Forêts de Guyane', Kourou, France | ||||
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| ISSN | 19326203 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 23 May 2013; Source: Scopus; Art. No.: e63678; :doi 10.1371/journal.pone.0063678; Language of Original Document: English; Correspondence Address: Aubry-Kientz, M.; Université des Antilles et de la Guyane, UMR 'Ecologie des Forêts de Guyane', Kourou, France; email: melaine.aubry-kientz@ecofog.gf | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 486 | ||
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| Author | Ploton, P.; Barbier, N.; Couteron, P.; Antin, C.M.; Ayyappan, N.; Balachandran, N.; Barathan, N.; Bastin, J.-F.; Chuyong, G.; Dauby, G.; Droissart, V.; Gastellu-Etchegorry, J.-P.; Kamdem, N.G.; Kenfack, D.; Libalah, M.; Mofack, G., II; Momo, S.T.; Pargal, S.; Petronelli, P.; Proisy, C.; Réjou-Méchain, M.; Sonké, B.; Texier, N.; Thomas, D.; Verley, P.; Zebaze Dongmo, D.; Berger, U.; Pélissier, R. | ||||
| Title |
Toward a general tropical forest biomass prediction model from very high resolution optical satellite images | Type | Journal Article | ||
| Year | 2017 | Publication | Remote Sensing of Environment | Abbreviated Journal | |
| Volume | 200 | Issue | Pages | 140-153 | |
| Keywords | Canopy structure; Forest carbon; Fourier transform; Lacunarity; Passive optical imagery; Redd; Texture; Tropical forests | ||||
| Abstract | Very high spatial resolution (VHSR) optical satellite imagery has shown good potential to provide non-saturating proxies of tropical forest aboveground biomass (AGB) from the analysis of canopy texture, for instance through the Fourier Transform Textural Ordination method. Empirical case studies however showed that the relationship between Fourier texture features and forest AGB varies across forest types and regions of the world, limiting model transferability. A better understanding of the biophysical mechanisms on which canopy texture – forest AGB relation relies is a prerequisite to move toward broad scale applications. Here we simulated VHSR optical canopy scenes in identical sun-sensor geometry for 279 1-ha tropical forest inventory plots distributed across the tropics. Our aim was to assess the respective merits and complementarity of two types of texture analysis techniques (i.e. Fourier and lacunarity) on a set of forests with contrasted structure and geographical origin, and develop a general texture-based approach for tropical forest AGB mapping. Across forests, Fourier texture captured a gradient of stands mean crown size reflecting well the progressive changes in stand structure throughout forest aggradation phase (e.g. Pearson's r = − 0.42 with basal area) while lacunarity texture captured a gradient of canopy openness (, i.e. Pearson's r = − 0.57 with stand gap fraction). Both types of texture indices were highly complementary for predicting forest AGB at the global level (so-called FL-model). The residual error of the FL-model was structured across sites and could be partially captured with a bioclimatic proxy, further improving the performance of the global model (so-called FLE-model) and reducing site-level biases. The FLE model was tested on a set of real Pleiades images covering a mosaic of high-biomass forests in the Congo basin (mean AGB over 49 field plots: 359 ± 98 Mg ha− 1), leading to a significant relationship (R2 = 0.47 on validation data) with reasonable error levels (< 25% rRMSE). The increasing availability of VHSR optical sensors (such as from constellations of small satellite platforms) raises the possibility of routine repeated imaging of the world's tropical forests and suggests that texture-based analyses could become an essential tool in international efforts to monitor carbon emissions from deforestation and forest degradations (REDD +). © 2017 Elsevier Inc. | ||||
| Address | Technische Universität Dresden, Faculty of Environmental Sciences, Institute of Forest Growth and Forest Computer Sciences, Tharandt, Germany | ||||
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| Notes | Export Date: 25 September 2017 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 766 | ||
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| Author | Schmitt, Sylvain ; Derroire, Géraldine ; Tysklind, Niklas ; Heuertz, Myriam ; Hérault, Bruno | ||||
| Title |
Topography shapes the local coexistence of tree species within species complexes of Neotropical forests | Type | Journal Article | ||
| Year | 2021 | Publication | Oecologia | Abbreviated Journal | |
| Volume | 196 | Issue | Pages | 389-398 | |
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| Abstract | Forest inventories in Amazonia include around 5000 described tree species belonging to more than 800 genera. Numerous species-rich genera share genetic variation among species because of recent speciation and/or recurrent hybridisation, forming species complexes. Despite the key role that tree species complexes play in understanding Neotropical diversification, and their need to exploit a diversity of niches, little is known about the mechanisms that allow local coexistence of tree species complexes and their species in sympatry. In this study, we explored the fine-scale distribution of five tree species complexes and 22 species within these complexes. Combining forest inventories, botanical determination, and LiDAR-derived topographic data over 120 ha of permanent plots in French Guiana, we used a Bayesian modelling framework to test the role of fine-scale topographic wetness and tree neighbourhood on the occurrence of species complexes and the relative distribution of species within complexes. Species complexes of Neotropical trees were widely spread across the topographic wetness gradient at the local scale. Species within complexes showed pervasive niche differentiation along with topographic wetness and competition gradients. Similar patterns of species-specific habitat preferences were observed within several species complexes: species more tolerant to competition for resources grow in drier and less fertile plateaus and slopes. If supported by partial reproductive isolation of species and adaptive introgression at the species complex level, our results suggest that both species-specific habitat specialisation within species complexes and the broad ecological distribution of species complexes might explain the success of these species complexes at the regional scale. | ||||
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| Publisher | Springer Link | Place of Publication | Editor | ||
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| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 1018 | ||
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| Author | Schmitt, Sylvain ; Tysklind, Niklas ; Hérault, Bruno ; Heuertz, Myriam | ||||
| Title |
Topography drives microgeographic adaptations of closely related species in two tropical tree species complexes | Type | Journal Article | ||
| Year | 2021 | Publication | Molecular Ecology | Abbreviated Journal | |
| Volume | 30 | Issue | 20 | Pages | 5080-5093 |
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| Abstract | Closely related tree species that grow in sympatry are abundant in rainforests. However, little is known of the ecoevolutionary processes that govern their niches and local coexistence. We assessed genetic species delimitation in closely related sympatric species belonging to two Neotropical tree species complexes and investigated their genomic adaptation to a fine-scale topographic gradient with associated edaphic and hydrologic features. Combining LiDAR-derived topography, tree inventories, and single nucleotide polymorphisms (SNPs) from gene capture experiments, we explored genome-wide population genetic structure, covariation of environmental variables, and genotype-environment association to assess microgeographic adaptations to topography within the species complexes Symphonia (Clusiaceae), and Eschweilera (Lecythidaceae) with three species per complex and 385 and 257 individuals genotyped, respectively. Within species complexes, closely related tree species had different realized optima for topographic niches defined through the topographic wetness index or the relative elevation, and species displayed genetic signatures of adaptations to these niches. Symphonia species were genetically differentiated along water and nutrient distribution particularly in genes responding to water deprivation, whereas Eschweilera species were genetically differentiated according to soil chemistry. Our results suggest that varied topography represents a powerful driver of processes modulating tropical forest biodiversity with differential adaptations that stabilize local coexistence of closely related tree species. | ||||
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| Publisher | Wiley | Place of Publication | Editor | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 1045 | ||
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| Author | Schmitt, S.; Hérault, B.; Ducouret, É.; Baranger, A.; Tysklind, N.; Heuertz, M.; Marcon, É.; Cazal, S.O.; Derroire, G. | ||||
| Title |
Topography consistently drives intra- and inter-specific leaf trait variation within tree species complexes in a Neotropical forest | Type | Journal Article | ||
| Year | 2020 | Publication | Oikos | Abbreviated Journal | Oikos |
| Volume | 129 | Issue | 10 | Pages | 1521-1530 |
| Keywords | intraspecific variability; leaf traits; Paracou; species complex; syngameon; tropical forests; Bayesian analysis; coexistence; divergence; genetic variation; hierarchical system; leaf area; local adaptation; niche overlap; species diversity; topography; tropical forest; Guyana Shield | ||||
| Abstract | Tropical forests shelter the highest species diversity worldwide, although genus diversity is lower than expected. In the species-rich genera, species complexes are composed of closely-related species that share large amounts of genetic variation. Despite the key role of species complexes in diversification, evolution and functioning of ecological communities, little is known on why species complexes arise and how they are maintained in Neotropical forests. Examining how individual phenotypes vary along environmental gradients, within and among closely-related species within species complexes, can reveal processes allowing species coexistence within species complexes. We examined leaf functional trait variation with topography in a hyperdiverse tropical forest of the Guiana Shield. We collected leaf functional traits from 766 trees belonging to five species in two species complexes in permanent plots encompassing a diversity of topographic positions. We tested the role of topography on leaf functional trait variation with a hierarchical Bayesian model, controlling for individual tree diameter effect. We show that, mirroring what has been previously observed among species and communities, individual leaf traits covary from acquisitive to conservative strategy within species. Moreover, decreasing wetness from bottomlands to plateaus was associated with a shift of leaf traits from an acquisitive to a conservative strategy both across and within closely-related species. Our results suggest that intraspecific trait variability widens species’ niches and converges at species’ margins where niches overlap, potentially implying local neutral processes. Intraspecific trait variability favors local adaptation and divergence of closely-related species within species complexes. It is potentially maintained through interspecific sharing of genetic variation through hybridization. © 2020 Nordic Society Oikos. Published by John Wiley & Sons Ltd | ||||
| Address | INRAE, UMR EcoFoG (Agroparistech, CNRS, Cirad, Université des Antilles, Univ. de la Guyane), Kourou, French Guiana | ||||
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| Publisher | Blackwell Publishing Ltd | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 00301299 (Issn) | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | EcoFoG @ webmaster @ | Serial | 950 | ||
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