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Heuertz, M.; Caron, H.; Scotti-Saintagne, C.; Pétronelli, P.; Engel, J.; Tysklind, N.; Miloudi, S.; Gaiotto, F.A.; Chave, J.; Molino, J.-F.; Sabatier, D.; Loureiro, J.; Budde, K.B. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
The hyperdominant tropical tree Eschweilera coriacea (Lecythidaceae) shows higher genetic heterogeneity than sympatric Eschweilera species in French Guiana |
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Journal Article |
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Year |
2020 |
Publication |
Plant Ecology and Evolution |
Abbreviated Journal |
Plant Ecol. Evol. |
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153 |
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1 |
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67-81 |
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Cryptic species; Eschweilera; Hyperdominant tropical trees; Microsatellites; Species complex; Species delimitation |
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Background and aims – The evolutionary history of Amazonia’s hyperabundant tropical tree species, also known as “hyperdominant” species, remains poorly investigated. We assessed whether the hyperdominant Eschweilera coriacea (DC.) S.A.Mori (Lecythidaceae) represents a single genetically cohesive species, and how its genetic constitution relates to other species from the same clade with which it occurs sympatrically in French Guiana. Methods – We sampled 152 individuals in nine forest sites in French Guiana, representing 11 species of the genus Eschweilera all belonging to the Parvifolia clade, with emphasis on E. coriacea. Samples were genotyped at four simple sequence repeat (SSR) markers. We delimited gene pools, i.e., genetically coherent putative taxa, using STRUCTURE software and principal component analysis. We compared the genetic assignment of individuals with their morphological species determination and estimated genetic diversity and differentiation for gene pools and species. We also estimated genome size using flow cytometry. Key results – SSR profiles commonly displayed up to four alleles per genotype, suggesting that the investigated Eschweilera species bear a paleopolyploid signature. Flow cytometry suggested that the studied species are diploid with haploid genome sizes of 871–1046 Mbp. We detected five gene pools and observed a good correspondence between morphological and genetic delimitation for Eschweilera sagotiana Miers and the undescribed morphospecies E. sp. 3 (which resembles E. grandiflora (Aubl.) Sandwith), and to a lesser extent for E. decolorans Sandwith and E. micrantha (O.Berg) Miers. Eschweilera coriacea was the most genetically diverse species and included individuals assigned to each gene pool. Conclusions – We found no conclusive evidence for cryptic species within E. coriacea in French Guiana. SSRs detected fewer gene pools than expected based on morphology in the Parvifolia clade but discriminated evolutionary relationships better than available plastid markers. A positive trend between demographic abundance of species and allelic richness illustrates that hyperdominants may have a high evolutionary potential. This hypothesis can be tested using more powerful genomic data in combination with tree phenotypic trait variation and characterization of niche breadth, to enhance our understanding of the causes of hyperdominance in Amazonian trees. |
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University of Copenhagen, Forest, Nature and Biomass, Rolighedsvej 23, Frederiksberg C, DK-1958, Denmark |
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Societe Royale de Botanique de Belgique |
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20323913 (Issn) |
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EcoFoG @ webmaster @ |
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928 |
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Ramalho, M.O.; Duplais, C.; Orivel, J.; Dejean, A.; Gibson, J.C.; Suarez, A.V.; Moreau, C.S. |
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Development but not diet alters microbial communities in the Neotropical arboreal trap jaw ant Daceton armigerum: an exploratory study |
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Journal Article |
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2020 |
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Scientific Reports |
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10 |
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1 |
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7350 |
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To better understand the evolutionary significance of symbiotic interactions in nature, microbiome studies can help to identify the ecological factors that may shape host-associated microbial communities. In this study we explored both 16S and 18S rRNA microbial communities of D. armigerum from both wild caught individuals collected in the Amazon and individuals kept in the laboratory and fed on controlled diets. We also investigated the role of colony, sample type, development and caste on structuring microbial communities. Our bacterial results (16S rRNA) reveal that (1) there are colony level differences between bacterial communities; (2) castes do not structure communities; (3) immature stages (brood) have different bacterial communities than adults; and 4) individuals kept in the laboratory with a restricted diet showed no differences in their bacterial communities from their wild caught nest mates, which could indicate the presence of a stable and persistent resident bacterial community in this host species. The same categories were also tested for microbial eukaryote communities (18S rRNA), and (5) developmental stage has an influence on the diversity recovered; (6) the diversity of taxa recovered has shown this can be an important tool to understand additional aspects of host biology and species interactions. |
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EcoFoG @ webmaster @ Ramalho2020 |
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929 |
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Gargallo-Garriga, A.; Sardans, J.; Granda, V.; Llusià, J.; Peguero, G.; Asensio, D.; Ogaya, R.; Urbina, I.; Van Langenhove, L.; Verryckt, L.T.; Chave, J.; Courtois, E.A.; Stahl, C.; Grau, O.; Klem, K.; Urban, O.; Janssens, I.A.; Peñuelas, J. |
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Different “metabolomic niches” of the highly diverse tree species of the French Guiana rainforests |
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Journal Article |
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2020 |
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Scientific Reports |
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Sci. Rep. |
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10 |
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6937 |
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article; ecological niche; French Guiana; metabolome; plant leaf; rainy season; reproduction; stress; tropical rain forest |
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Tropical rainforests harbor a particularly high plant diversity. We hypothesize that potential causes underlying this high diversity should be linked to distinct overall functionality (defense and growth allocation, anti-stress mechanisms, reproduction) among the different sympatric taxa. In this study we tested the hypothesis of the existence of a metabolomic niche related to a species-specific differential use and allocation of metabolites. We tested this hypothesis by comparing leaf metabolomic profiles of 54 species in two rainforests of French Guiana. Species identity explained most of the variation in the metabolome, with a species-specific metabolomic profile across dry and wet seasons. In addition to this “homeostatic” species-specific metabolomic profile significantly linked to phylogenetic distances, also part of the variance (flexibility) of the metabolomic profile was explained by season within a single species. Our results support the hypothesis of the high diversity in tropical forest being related to a species-specific metabolomic niche and highlight ecometabolomics as a tool to identify this species functional diversity related and consistent with the ecological niche theory. © 2020, The Author(s). |
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INRA, UMR EcoFoG, CNRS, Cirad, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France |
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Nature Research |
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EcoFoG @ webmaster @ |
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930 |
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Levionnois, S.; Tysklind, N.; Nicolini, E.; Ferry, B.; Troispoux, V.; Le Moguedec, G.; Morel, H.; Stahl, C.; Coste, S.; Caron, H.; Heuret, P. |
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Soil variation response is mediated by growth trajectories rather than functional traits in a widespread pioneer Neotropical tree |
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Journal Article |
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2020 |
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bioRxiv, peer-reviewed by Peer Community in Ecology |
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351197 |
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v4 |
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Trait-environment relationships have been described at the community level across tree species. However, whether interspecific trait-environment relationships are consistent at the intraspecific level is yet unknown. Moreover, we do not know how consistent is the response between organ vs. whole-tree level.We examined phenotypic variability for 16 functional leaf (dimensions, nutrient, chlorophyll) and wood traits (density) across two soil types, Ferralitic Soil (FS) vs. White Sands (WS), on two sites for 70 adult trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a widespread pioneer Neotropical genus that generally dominates early successional forest stages. To understand how soil types impact resource-use through the processes of growth and branching, we examined the architectural development with a retrospective analysis of growth trajectories. We expect soil types to affect both, functional traits in relation to resource acquisition strategy as already described at the interspecific level, and growth strategies due to resource limitations with reduced growth on poor soils.Functional traits were not involved in the soil response, as only two traits-leaf residual water content and K content-showed significant differences across soil types. Soil effects were stronger on growth trajectories, with WS trees having the slowest growth trajectories and less numerous branches across their lifespan.The analysis of growth trajectories based on architectural analysis improved our ability to characterise the response of trees with soil types. The intraspecific variability is higher for growth trajectories than functional traits for C. obtusa, revealing the complementarity of the architectural approach with the functional approach to gain insights on the way trees manage their resources over their lifetime. Soil-related responses of Cecropia functional traits are not the same as those at the interspecific level, suggesting that the effects of the acting ecological processes are different between the two levels. Apart from soil differences, much variation was found across sites, which calls for further investigation of the factors shaping growth trajectories in tropical forests. |
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EcoFoG @ webmaster @ |
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931 |
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Sullivan, M.J.P.; Lewis, S.L.; Affum-Baffoe, K.; Castilho, C.; Costa, F.; Sanchez, A.C.; Ewango, C.E.N.; Hubau, W.; Marimon, B.; Monteagudo-Mendoza, A.; Qie, L.; Sonké, B.; Martinez, R.V.; Baker, T.R.; Brienen, R.J.W.; Feldpausch, T.R.; Galbraith, D.; Gloor, M.; Malhi, Y.; Aiba, S.-I.; Alexiades, M.N.; Almeida, E.C.; de Oliveira, E.A.; Dávila, E.Á.; Loayza, P.A.; Andrade, A.; Vieira, S.A.; Aragão, L.E.O.C.; Araujo-Murakami, A.; Arets, E.J.M.M.; Arroyo, L.; Ashton, P.; Aymard C., G.; Baccaro, F.B.; Banin, L.F.; Baraloto, C.; Camargo, P.B.; Barlow, J.; Barroso, J.; Bastin, J.-F.; Batterman, S.A.; Beeckman, H.; Begne, S.K.; Bennett, A.C.; Berenguer, E.; Berry, N.; Blanc, L.; Boeckx, P.; Bogaert, J.; Bonal, D.; Bongers, F.; Bradford, M.; Brearley, F.Q.; Brncic, T.; Brown, F.; Burban, B.; Camargo, J.L.; Castro, W.; Céron, C.; Ribeiro, S.C.; Moscoso, V.C.; Chave, J.; Chezeaux, E.; Clark, C.J.; de Souza, F.C.; Collins, M.; Comiskey, J.A.; Valverde, F.C.; Medina, M.C.; da Costa, L.; Dančák, M.; Dargie, G.C.; Davies, S.; Cardozo, N.D.; de Haulleville, T.; de Medeiros, M.B.; del Aguila Pasquel, J.; Derroire, G.; Di Fiore, A.; Doucet, J.-L.; Dourdain, A.; Droissant, V.; Duque, L.F.; Ekoungoulou, R.; Elias, F.; Erwin, T.; Esquivel-Muelbert, A.; Fauset, S.; Ferreira, J.; Llampazo, G.F.; Foli, E.; Ford, A.; Gilpin, M.; Hall, J.S.; Hamer, K.C.; Hamilton, A.C.; Harris, D.J.; Hart, T.B.; Hédl, R.; Herault, B.; Herrera, R.; Higuchi, N.; Hladik, A.; Coronado, E.H.; Huamantupa-Chuquimaco, I.; Huasco, W.H.; Jeffery, K.J.; Jimenez-Rojas, E.; Kalamandeen, M.; Djuikouo, M.N.K.; Kearsley, E.; Umetsu, R.K.; Kho, L.K.; Killeen, T.; Kitayama, K.; Klitgaard, B.; Koch, A.; Labrière, N.; Laurance, W.; Laurance, S.; Leal, M.E.; Levesley, A.; Lima, A.J.N.; Lisingo, J.; Lopes, A.P.; Lopez-Gonzalez, G.; Lovejoy, T.; Lovett, J.C.; Lowe, R.; Magnusson, W.E.; Malumbres-Olarte, J.; Manzatto, Â.G.; Marimon, B.H.; Marshall, A.R.; Marthews, T.; de Almeida Reis, S.M.; Maycock, C.; Melgaço, K.; Mendoza, C.; Metali, F.; Mihindou, V.; Milliken, W.; Mitchard, E.T.A.; Morandi, P.S.; Mossman, H.L.; Nagy, L.; Nascimento, H.; Neill, D.; Nilus, R.; Vargas, P.N.; Palacios, W.; Camacho, N.P.; Peacock, J.; Pendry, C.; Peñuela Mora, M.C.; Pickavance, G.C.; Pipoly, J.; Pitman, N.; Playfair, M.; Poorter, L.; Poulsen, J.R.; Poulsen, A.D.; Preziosi, R.; Prieto, A.; Primack, R.B.; Ramírez-Angulo, H.; Reitsma, J.; Réjou-Méchain, M.; Correa, Z.R.; de Sousa, T.R.; Bayona, L.R.; Roopsind, A.; Rudas, A.; Rutishauser, E.; Abu Salim, K.; Salomão, R.P.; Schietti, J.; Sheil, D.; Silva, R.C.; Espejo, J.S.; Valeria, C.S.; Silveira, M.; Simo-Droissart, M.; Simon, M.F.; Singh, J.; Soto Shareva, Y.C.; Stahl, C.; Stropp, J.; Sukri, R.; Sunderland, T.; Svátek, M.; Swaine, M.D.; Swamy, V.; Taedoumg, H.; Talbot, J.; Taplin, J.; Taylor, D.; ter Steege, H.; Terborgh, J.; Thomas, R.; Thomas, S.C.; Torres-Lezama, A.; Umunay, P.; Gamarra, L.V.; van der Heijden, G.; van der Hout, P.; van der Meer, P.; van Nieuwstadt, M.; Verbeeck, H.; Vernimmen, R.; Vicentini, A.; Vieira, I.C.G.; Torre, E.V.; Vleminckx, J.; Vos, V.; Wang, O.; White, L.J.T.; Willcock, S.; Woods, J.T.; Wortel, V.; Young, K.; Zagt, R.; Zemagho, L.; Zuidema, P.A.; Zwerts, J.A.; Phillips, O.L. |
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Title |
Long-term thermal sensitivity of Earth’s tropical forests |
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Journal Article |
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2020 |
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Science |
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368 |
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6493 |
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869-874 |
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A key uncertainty in climate change models is the thermal sensitivity of tropical forests and how this value might influence carbon fluxes. Sullivan et al. measured carbon stocks and fluxes in permanent forest plots distributed globally. This synthesis of plot networks across climatic and biogeographic gradients shows that forest thermal sensitivity is dominated by high daytime temperatures. This extreme condition depresses growth rates and shortens the time that carbon resides in the ecosystem by killing trees under hot, dry conditions. The effect of temperature is worse above 32°C, and a greater magnitude of climate change thus risks greater loss of tropical forest carbon stocks. Nevertheless, forest carbon stocks are likely to remain higher under moderate climate change if they are protected from direct impacts such as clearance, logging, or fires.Science, this issue p. 869The sensitivity of tropical forest carbon to climate is a key uncertainty in predicting global climate change. Although short-term drying and warming are known to affect forests, it is unknown if such effects translate into long-term responses. Here, we analyze 590 permanent plots measured across the tropics to derive the equilibrium climate controls on forest carbon. Maximum temperature is the most important predictor of aboveground biomass (−9.1 megagrams of carbon per hectare per degree Celsius), primarily by reducing woody productivity, and has a greater impact per °C in the hottest forests (>32.2°C). Our results nevertheless reveal greater thermal resilience than observations of short-term variation imply. To realize the long-term climate adaptation potential of tropical forests requires both protecting them and stabilizing Earth’s climate. |
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EcoFoG @ webmaster @ |
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932 |
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Duplais, C.; Papon, N.; Courdavault, V. |
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Tracking the Origin and Evolution of Plant Metabolites |
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Journal Article |
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2020 |
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Trends in Plant Science |
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Trends Plant Sci. |
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25 |
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12 |
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1182-1184 |
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enzyme evolution; iridoids; Lamiaceae; nepetalactone; plant metabolites |
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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 |
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Biomolécules et Biotechnologies Végétales (BBV) EA 2106, Université de Tours, Tours, France |
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Elsevier Ltd |
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13601385 (Issn) |
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Mahoui,Sihem ; Moulay, Mohamed Said ; Omrane, Abdennebi |
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Finite element approach to linear parabolic pointwise control problems of incomplete data |
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2020 |
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International Journal of Systems Science |
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51 |
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14 |
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2597-2609 |
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Optimal control problem ; low-regret control ; pointwise control ; finite element method ; a priori error estimates |
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In this paper we give a priori error estimates for finite element approximations of linear parabolicproblems with pointwise control and incomplete data. We discretise the optimal control problemby using piecewise linear and continuous finite elements for the space discretisation of the state,and we use the backward Euler scheme for time discretisation. We prove a priori error estimates forthe state, the adjoint-state as well as for the low-regret pointwise optimal control. |
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TAYLOR & FRANCIS LTD |
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Legeay, J.; Husson, C.; Boudier, B.; Louisanna, E.; Baraloto, C.; Schimann, H.; Marcais, B.; Buée, M. |
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Surprising low diversity of the plant pathogen Phytophthora in Amazonian forests |
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Journal Article |
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2020 |
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Environmental Microbiology |
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Environ. Microbiol. |
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22 |
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12 |
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5019-5032 |
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The genus Phytophthora represents a group of plant pathogens with broad global distribution. The majority of them cause the collar and root-rot of diverse plant species. Little is known about Phytophthora communities in forest ecosystems, especially in the Neotropical forests where natural enemies could maintain the huge plant diversity via negative density dependence. We characterized the diversity of soil-borne Phytophthora communities in the North French Guiana rainforest and investigated how they are structured by host identity and environmental factors. In this little-explored habitat, 250 soil cores were sampled from 10 plots hosting 10 different plant families across three forest environments (Terra Firme, Seasonally Flooded and White Sand). Phytophthora diversity was studied using a baiting approach and metabarcoding (High-Throughput Sequencing) on environmental DNA extracted from both soil samples and baiting-leaves. These three approaches revealed very similar communities, characterized by an unexpected low diversity of Phytophthora species, with the dominance of two cryptic species close to Phytophthora heveae. As expected, the Phytophthora community composition of the French Guiana rainforest was significantly impacted by the host plant family and environment. However, these plant pathogen communities are very small and are dominated by generalist species, questioning their potential roles as drivers of plant diversity in these Amazonian forests. © 2020 Society for Applied Microbiology and John Wiley & Sons Ltd. |
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International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL 33199, United States |
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Blackwell Publishing Ltd |
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Céréghino, R.; Françoise, L.; Bonhomme, C.; Carrias, J.-F.; Compin, A.; Corbara, B.; Jassey, V.; Leflaive, J.; Rota, T.; Farjalla, V.; Leroy, C. |
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Title |
Desiccation resistance traits predict freshwater invertebrate survival and community response to drought scenarios in a Neotropical ecosystem |
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Journal Article |
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Year |
2020 |
Publication |
Ecological Indicators |
Abbreviated Journal |
Ecol. Indic. |
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119 |
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106839 |
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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 |
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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 |
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ECOFOG, AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles, Campus Agronomique, Kourou, 97379, France |
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Elsevier B.V. |
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1470160x (Issn) |
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EcoFoG @ webmaster @ |
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941 |
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Romero, G.Q.; Marino, N.A.C.; MacDonald, A.A.M.; Céréghino, R.; Trzcinski, M.K.; Mercado, D.A.; Leroy, C.; Corbara, B.; Farjalla, V.F.; Barberis, I.M.; Dézerald, O.; Hammill, E.; Atwood, T.B.; Piccoli, G.C.O.; Bautista, F.O.; Carrias, J.-F.; Leal, J.S.; Montero, G.; Antiqueira, P.A.P.; Freire, R.; Realpe, E.; Amundrud, S.L.; de Omena, P.M.; Campos, A.B.A.; Kratina, P.; O’Gorman, E.J.; Srivastava, D.S. |
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Title |
Extreme rainfall events alter the trophic structure in bromeliad tanks across the Neotropics |
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Journal Article |
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Year |
2020 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Commun. |
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11 |
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3215 |
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fresh water; rain; fresh water; agricultural intensification; angiosperm; biomass; climate change; ecosystem function; extreme event; food web; freshwater ecosystem; Neotropic Ecozone; precipitation intensity; rainfall; trophic structure; Article; biomass; Central America; controlled study; detritivore; drought; flooding; food web; hydrology; microcosm; Neotropics; nonhuman; precipitation; predator; South America; trophic level; animal; biodiversity; Bromelia; climate change; ecosystem; flooding; food chain; Central America; South America; Animals; Biodiversity; Biomass; Bromelia; Climate Change; Droughts; Ecosystem; Floods; Food Chain; Fresh Water; Hydrology; South America |
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Changes in global and regional precipitation regimes are among the most pervasive components of climate change. Intensification of rainfall cycles, ranging from frequent downpours to severe droughts, could cause widespread, but largely unknown, alterations to trophic structure and ecosystem function. We conducted multi-site coordinated experiments to show how variation in the quantity and evenness of rainfall modulates trophic structure in 210 natural freshwater microcosms (tank bromeliads) across Central and South America (18°N to 29°S). The biomass of smaller organisms (detritivores) was higher under more stable hydrological conditions. Conversely, the biomass of predators was highest when rainfall was uneven, resulting in top-heavy biomass pyramids. These results illustrate how extremes of precipitation, resulting in localized droughts or flooding, can erode the base of freshwater food webs, with negative implications for the stability of trophic dynamics. © 2020, The Author(s). |
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Institute of Biological Sciences, Universidade Federal do Pará, Belém, PA, Brazil |
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Nature Research |
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20411723 (Issn) |
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EcoFoG @ webmaster @ |
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