| Records |
| Author |
Denis, T.; Richard-Hansen, C.; Brunaux, O.; Etienne, M.-P.; Guitet, S.; Herault, B. |
| Title |
Biological traits, rather than environment, shape detection curves of large vertebrates in neotropical rainforests |
Type |
Journal Article |
| Year |
2017 |
Publication |
Ecological Applications |
Abbreviated Journal |
Ecol Appl |
| Volume |
27 |
Issue |
5 |
Pages |
1564-1577 |
| Keywords |
abundance; camouflage; distance sampling; encounter rate; French Guiana; hunting vulnerability; line transect; Neotropical terra firme rainforests; relative abundance |
Abstract  |
Line transect surveys are widely used in Neotropical rainforests to estimate the population abundance of medium- and large-sized vertebrates. The use of indices such as encounter rate has been criticized because the probability of animal detection may fluctuate due to the heterogeneity of environmental conditions among sites. In addition, the morphological and behavioral characteristics (biological traits) of species affect their detectability. In this study, we compared the extent to which environmental conditions and species’ biological traits bias abundance estimates in terra firme rainforests in French Guiana. The selected environmental conditions included both physical conditions and forest structure covariates, while the selected biological traits included the morphological and behavioral characteristics of species. We used the distance sampling method to model the detection probability as an explicit function of environmental conditions and biological traits and implemented a model selection process to determine the relative importance of each group of covariates. Biological traits contributed to the variability of animal detectability more than environmental conditions, which had only a marginal effect. Detectability was best for large animals with uniform or disruptive markings that live in groups in the canopy top. Detectability was worst for small, solitary, terrestrial animals with mottled markings. In the terra firme rainforests that represent ~80% of the Amazonia and Guianas regions, our findings support the use of relative indices such as the encounter rate to compare population abundance between sites in species-specific studies. Even though terra firme rainforests may appear similar between regions of Amazonia and the Guianas, comparability must be ensured, especially in forests disturbed by human activity. The detection probability can be used as an indicator of species’ vulnerability to hunting and, thus, to the risk of local extinction. Only a few biological trait covariates are required to correctly estimate the detectability of the majority of medium- and large-sized vertebrates. Thus, a biological trait model could be useful in predicting the detection probabilities of rare, uncommon, or localized species for which few data are available to fit the detection function. |
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1939-5582 |
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no |
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EcoFoG @ webmaster @ |
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764 |
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De Souza, F.C.; Dexter, K.G.; Phillips, O.L.; Brienen, R.J.W.; Chave, J.; Galbraith, D.R.; Gonzalez, G.L.; Mendoza, A.M.; Toby Pennington, R.; Poorter, L.; Alexiades, M.; Álvarez-Dávila, E.; Andrade, A.; Aragão, L.E.O.C.; Araujo-Murakami, A.; Arets, E.J.M.M.; Aymard C., G.A.; Baraloto, C.; Barroso, J.G.; Bonal, D.; Boot, R.G.A.; Camargo, J.L.C.; Comiskey, J.A.; Valverde, F.C.; De Camargo, P.B.; Di Fiore, A.; Elias, F.; Erwin, T.L.; Feldpausch, T.R.; Ferreira, L.; Fyllas, N.M.; Gloor, E.; Herault, B.; Herrera, R.; Higuchi, N.; Coronado, E.N.H.; Killeen, T.J.; Laurance, W.F.; Laurance, S.; Lloyd, J.; Lovejoy, T.E.; Malhi, Y.; Maracahipes, L.; Marimon, B.S.; Marimon-Junior, B.H.; Mendoza, C.; Morandi, P.; Neill, D.A.; Vargas, P.N.; Oliveira, E.A.; Lenza, E.; Palacios, W.A.; Peñuela-Mora, M.C.; Pipoly, J.J., III; Pitman, N.C.A.; Prieto, A.; Quesada, C.A.; Ramirez-Angulo, H.; Rudas, A.; Ruokolainen, K.; Salomão, R.P.; Silveira, M.; Stropp, J.; Steege, H.T.; Thomas-Caesar, R.; Van Der Hout, P.; Van Der Heijden, G.M.F.; Van Der Meer, P.J.; Vasquez, R.V.; Vieira, S.A.; Vilanova, E.; Vos, V.A.; Wang, O.; Young, K.R.; Zagt, R.J.; Baker, T.R. |
| Title |
Evolutionary heritage influences amazon tree ecology |
Type |
Journal Article |
| Year |
2016 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
Abbreviated Journal |
Proceedings of the Royal Society B: Biological Sciences |
| Volume |
283 |
Issue |
20161587 |
Pages |
|
| Keywords |
Convergent evolution; Divergent selection; Phylogenetic signal; Trait; Tropical tree |
| Abstract |
Lineages tend to retain ecological characteristics of their ancestors through time. However, for some traits, selection during evolutionary history may have also played a role in determining trait values. To address the relative importance of these processes requires large-scale quantification of traits and evolutionary relationships among species. The Amazonian tree flora comprises a high diversity of angiosperm lineages and species with widely differing life-history characteristics, providing an excellent system to investigate the combined influences of evolutionary heritage and selection in determining trait variation. We used trait data related to the major axes of life-history variation among tropical trees (e.g. growth and mortality rates) from 577 inventory plots in closed-canopy forest, mapped onto a phylogenetic hypothesis spanning more than 300 genera including all major angiosperm clades to test for evolutionary constraints on traits. We found significant phylogenetic signal (PS) for all traits, consistent with evolutionarily related genera having more similar characteristics than expected by chance. Although there is also evidence for repeated evolution of pioneer and shade tolerant lifehistory strategies within independent lineages, the existence of significant PS allows clearer predictions of the links between evolutionary diversity, ecosystem function and the response of tropical forests to global change. © 2016 The Authors. |
| Address |
Department of Geography and the Environment, University of Texas at Austin, Austin, TX, United States |
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Export Date: 17 January 2017 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
706 |
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| Author |
Coq, S.; Weigel, J.; Butenschoen, O.; Bonal, D.; Hattenschwiler, S. |
| Title |
Litter composition rather than plant presence affects decomposition of tropical litter mixtures |
Type |
Journal Article |
| Year |
2011 |
Publication |
Plant and Soil |
Abbreviated Journal |
Plant Soil |
| Volume |
343 |
Issue |
1-2 |
Pages |
273-286 |
| Keywords |
Amazonian lowland rainforest; Belowground/aboveground interactions; Litter decomposition; Non-additive effect; Nitrogen dynamic; Plant-soil feedback |
| Abstract |
Litter decomposition is strongly controlled by litter quality, but the composition of litter mixtures and potential interactions with live plants through root activity may also influence decomposers. In a greenhouse experiment in French Guiana we studied the combined effects of the presence of tropical tree seedlings and of distinct litter composition on mass and nitrogen (N) loss from decomposing litter and on microbial biomass. Different litter mixtures decomposed for 435 days in pots filled with sand and containing an individual seedling from one of four different tree species. We found both additive and negative non-additive effects (NAE) of litter mixing on mass loss, whereas N loss showed negative and positive NAE of litter mixing. If litter from the two tree species, Platonia insignis and Goupia glabra were present, litter mixtures showed more positive and more negative NAE on N loss, respectively. Overall, decomposition, and in particular non-additive effects, were only weakly affected by the presence of tree seedlings. Litter mass loss weakly yet significantly decreased with increasing fine root biomass in presence of Goupia seedlings, but not in the presence of seedlings of any other tree species. Our results showed strong litter composition effects and also clear, mostly negative, non-additive effects on mass loss and N loss. Species identity of tree seedlings can modify litter decomposition, but these live plant effects remain quantitatively inferior to litter composition effects. |
| Address |
[Coq, Sylvain; Haettenschwiler, Stephan] CNRS, CEFE, F-34293 Montpellier 5, France, Email: sylvain.coq@gmail.com |
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Springer |
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0032-079x |
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| Notes |
ISI:000290688000020 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
320 |
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| Author |
Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A. |
| Title |
Low intraspecific aggressiveness in two obligate plant-ant species |
Type |
Journal Article |
| Year |
2008 |
Publication |
Insectes Sociaux |
Abbreviated Journal |
Insect. Soc. |
| Volume |
55 |
Issue |
3 |
Pages |
238-240 |
| Keywords |
aggressiveness; Allomerus; myrmecophytes; plant-ants; recognition ability |
| Abstract |
Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiveness is very low whatever the distance separating the tested nests, while interspecific conflicts are always violent. Similar patterns of aggressiveness have been reported in various ant species, but the strictly arboreal life of Allomerus ants associated with the isolation of their adult colonies highlight different ecological conditions that might explain the lack of aggressiveness between conspecifics. |
| Address |
[Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A.] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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BIRKHAUSER VERLAG AG |
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Edition |
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0020-1812 |
ISBN |
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| Notes |
ISI:000258959300004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
208 |
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| Author |
Dezerald, O.; Leroy, C.; Corbara, B.; Carrias, J.-F.; Pélozuelo, L.; Dejean, A.; Céréghino, R. |
| Title |
Food-Web Structure in Relation to Environmental Gradients and Predator-Prey Ratios in Tank-Bromeliad Ecosystems |
Type |
Journal Article |
| Year |
2013 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
| Volume |
8 |
Issue |
8 |
Pages |
e71735 |
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| Abstract |
Little is known of how linkage patterns between species change along environmental gradients. The small, spatially discrete food webs inhabiting tank-bromeliads provide an excellent opportunity to analyse patterns of community diversity and food-web topology (connectance, linkage density, nestedness) in relation to key environmental variables (habitat size, detrital resource, incident radiation) and predators:prey ratios. We sampled 365 bromeliads in a wide range of understorey environments in French Guiana and used gut contents of invertebrates to draw the corresponding 365 connectance webs. At the bromeliad scale, habitat size (water volume) determined the number of species that constitute food-web nodes, the proportion of predators, and food-web topology. The number of species as well as the proportion of predators within bromeliads declined from open to forested habitats, where the volume of water collected by bromeliads was generally lower because of rainfall interception by the canopy. A core group of microorganisms and generalist detritivores remained relatively constant across environments. This suggests that (i) a highly-connected core ensures food-web stability and key ecosystem functions across environments, and (ii) larger deviations in food-web structures can be expected following disturbance if detritivores share traits that determine responses to environmental changes. While linkage density and nestedness were lower in bromeliads in the forest than in open areas, experiments are needed to confirm a trend for lower food-web stability in the understorey of primary forests. © 2013 Dézerald et al. |
| Address |
EcoLab, Laboratoire Ecologie Fonctionnelle et Environnement, CNRS UMR 5245, Toulouse, France |
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Edition |
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19326203 (Issn) |
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| Notes |
Export Date: 30 August 2013; Source: Scopus; Art. No.: e71735; Coden: Polnc; doi: 10.1371/journal.pone.0071735; Language of Original Document: English; Correspondence Address: Dézerald, O.; EcoFoG, Ecologie des Forêts de Guyane, CNRS UMR 8172, Kourou, France; email: olivier.dezerald@gmail.com |
Approved |
no |
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EcoFoG @ webmaster @ |
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499 |
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| Author |
Vleminckx, J.; Schimann, H.; Decaëns, T.; Fichaux, M.; Vedel, V.; Jaouen, G.; Roy, M.; Lapied, E.; Engel, J.; Dourdain, A.; Petronelli, P.; Orivel, J.; Baraloto, C. |
| Title |
Coordinated community structure among trees, fungi and invertebrate groups in Amazonian rainforests |
Type |
Journal Article |
| Year |
2019 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
| Volume |
9 |
Issue |
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Pages |
11337 |
| Keywords |
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| Abstract |
Little is known regarding how trophic interactions shape community assembly in tropical forests. Here we assess multi-taxonomic community assembly rules using a rare standardized coordinated inventory comprising exhaustive surveys of five highly-diverse taxonomic groups exerting key ecological functions: trees, fungi, earthworms, ants and spiders. We sampled 36 1.9-ha plots from four remote locations in French Guiana including precise soil measurements, and we tested whether species turnover was coordinated among groups across geographic and edaphic gradients. All species group pairs exhibited significant compositional associations that were independent from soil conditions. For some of the pairs, associations were also partly explained by soil properties, especially soil phosphorus availability. Our study provides evidence for coordinated turnover among taxonomic groups beyond simple relationships with environmental factors, thereby refining our understanding regarding the nature of interactions occurring among these ecologically important groups. © 2019, The Author(s). |
| Address |
CIRAD, UMR Ecologie des Forêts de Guyane, Campus agronomique, BP 316, Kourou Cedex, 97379, France |
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| Publisher |
Nature Publishing Group |
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Summary Language |
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Original Title |
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Edition |
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20452322 (Issn) |
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no |
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EcoFoG @ webmaster @ |
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879 |
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Hiltner, Ulrike ; Huth, Andreas ; Hérault, Bruno ; Holtmann, Anne ; Brauning, Achim ; Fischer, Rico |
| Title |
Climate change alters the ability of neotropical forests to provide timber and sequester carbon |
Type |
Journal Article |
| Year |
2021 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
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| Volume |
492 |
Issue |
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Pages |
119166 |
| Keywords |
Exploitation forestière ; Changement climatique ; séquestration du carbone ; Production du bois ; Atténuation des effets du changement climatique ; gestion forestière durable ; forêt tropicale ; Région néotropicale ; Biomasse ; biomasse aérienne des arbres ; gestion de la santé des forêts ; modèle de croissance forestière ; biodiversité forestière |
| Abstract |
Logging is widespread in tropical regions, with approximately 50% of all humid tropical forests (1.73 × 109 ha) regarded as production forests. To maintain the ecosystem functions of carbon sequestration and timber supply in tropical production forests over a long term, forest management must be sustainable under changing climate conditions. Individual-based forest models are useful tools to enhance our understanding about the long-term effects of harvest and climate change on forest dynamics because they link empirical field data with simulations of ecological processes. The objective of this study is to analyze the combined effects of selective logging and climate change on biomass stocks and timber harvest in a tropical forest in French Guiana. By applying a forest model, we simulated natural forest dynamics under the baseline scenario of current climate conditions and compared the results with scenarios of selective logging under climate change. The analyses revealed how substantially forest dynamics are altered
under different scenarios of climate change. (1) Repeated logging within recovery times decreased biomass and timber harvest, irrespective of the intensity of climate change. (2) With moderate climate change as envisaged by the 5th IPCC Assessment Report (representative concentration pathway 2.6), the average biomass remained the same as in the baseline scenario (−1%), but with intensive climate change (RCP 8.5), the average biomass decreased by 12%. (3) The combination of selective logging and climate change increased the likelihood of changes in forest dynamics, driven mainly by rising temperatures. Under RCP 8.5, the average timber harvest was almost halved, regardless of the logging cycle applied. An application-oriented use of forest models will help to identify opportunities to reduce the effects of unwanted ecosystem changes in a changing environment. To ensure that ecosystem functions in production forests are maintained under climate change conditions, appropriate management strategies will help to maintain biomass and harvest in production forests. |
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Elsevier B.V. |
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no |
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EcoFoG @ webmaster @ |
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1016 |
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| Author |
Tysklind, N.; Blanc-Jolivet, C.; Mader, M.; Meyer-Sand, B.R.V.; Paredes-Villanueva, K.; Honorio Coronado, E.N.; García-Dávila, C.R.; Sebbenn, A.M.; Caron, H.; Troispoux, V.; Guichoux, E.; Degen, B. |
| Title |
Development of nuclear and plastid SNP and INDEL markers for population genetic studies and timber traceability of Carapa species |
Type |
Journal Article |
| Year |
2019 |
Publication |
Conservation Genetics Resources |
Abbreviated Journal |
Conserv. Gen. Res. |
| Volume |
11 |
Issue |
3 |
Pages |
337-339 |
| Keywords |
Carapa guianensis; Carapa surinamensis; DNA-fingerprints; Geographical origin; MassARRAY; MiSeq; RADSeq; Tropical timber |
| Abstract |
Low coverage MiSeq genome sequencing and restriction associated DNA sequencing (RADseq) were used to identify nuclear and plastid SNP and INDEL genetic markers in Carapa guianensis. 261 genetic markers including 237 nuclear SNPs, 22 plastid SNPs, and 2 plastid INDELs are described based on 96 genotyped individuals from French Guiana, Brazil, Peru, and Bolivia. The best 117 SNPs for identifying population structure and performing individual assignment are assembled into four multiplexes for MassARRAY genotyping. |
| Address |
BIOGECO, INRA, University Bordeaux, Cestas, 33610, France |
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Springer Netherlands |
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18777252 (Issn) |
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no |
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EcoFoG @ webmaster @ |
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909 |
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Rodrigues, A.M.S.; Eparvier, V.; Odonne, G.; Amusant, N.; Stien, D.; Houël, E. |
| Title |
The antifungal potential of (Z)-ligustilide and the protective effect of eugenol demonstrated by a chemometric approach |
Type |
Journal Article |
| Year |
2019 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
| Volume |
9 |
Issue |
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Pages |
8729 |
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| Abstract |
Mankind is on the verge of a postantibiotic era. New concepts are needed in our battle to attenuate infectious diseases around the world and broad spectrum plant-inspired synergistic pharmaceutical preparations should find their place in the global fight against pathogenic microorganisms. To progress towards the discovery of potent antifungal agents against human pathologies, we embarked upon developing chemometric approach coupled with statistical design to unravel the origin of the anticandidal potential of a set of 66 essential oils (EOs). EOs were analyzed by GC-MS and tested against Candida albicans and C. parapsilosis (Minimal Inhibitory Concentration, MIC). An Orthogonal Partial Least Square (OPLS) analysis allowed us to identify six molecules presumably responsible for the anticandidal activity of the oils: (Z)-ligustilide, eugenol, eugenyl acetate, citral, thymol, and β-citronellol. These compounds were combined following a full factorial experimental design approach in order to optimize the anticandidal activity and selectivity index (SI = IC50(MRC5 cells)/MIC) through reconstituted mixtures. (Z)-Ligustilide and citral were the most active compounds, while (Z)-ligustilide and eugenol were the two main factors that most contributed to the increase of the SI. These two terpenes can, therefore, be used to construct bioinspired synergistic anticandidal mixtures. © 2019, The Author(s). |
| Address |
CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, Cayenne, 97300, France |
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Nature Publishing Group |
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20452322 (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
876 |
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| Author |
Pavoine, S.; Marcon, E.; Ricotta, C. |
| Title |
‘Equivalent numbers’ for species, phylogenetic or functional diversity in a nested hierarchy of multiple scales |
Type |
Journal Article |
| Year |
2016 |
Publication |
Methods in Ecology and Evolution |
Abbreviated Journal |
Methods in Ecology and Evolution |
| Volume |
7 |
Issue |
10 |
Pages |
1152-1163 |
| Keywords |
alpha diversity; beta diversity; biodiversity; community ecology; community phylogenetics; diversity apportionment; gamma diversity; quadratic entropy |
| Abstract |
Many recent studies have searched to integrate species’ functions and phylogenies in the measurement of biodiversity. To obtain easily interpretable measures, some researchers recommended diversity indices expressed in terms of equivalent numbers of species: the number of equally likely and maximally dissimilar species needed to produce the given value of diversity. Then, biodiversity is often calculated at three scales: within communities (α diversity), among communities (β diversity) and in a region (γ diversity). These three scales are, however, insufficient to tackle the organization of biodiversity in space because, for most organisms, there is a nested hierarchy of multiple scales characterized by different patterns and processes, from the small neighbourhood to the biosphere. We developed methodologies for analysing species, functional, taxonomic or phylogenetic diversity in a hierarchy of multiple scales using equivalent numbers of species. As an example, we analysed the taxonomic and functional diversity of macroinvertebrate assemblages in the Loire River, France, at four levels: within sites (α diversity), among sites within geological regions (β1 diversity), among geological regions (β2 diversity) and at the river scale (γ diversity). The new hierarchical approaches of biodiversity revealed very low differences among sites within regions and among regions in terms of taxonomy and functional traits (size and diet), despite moderate, significant species turnover among geological regions. We compare our framework with those other authors have developed. We argue that different definitions of α, β, γ diversities are used in the literature reflecting different points of view on biodiversity. We make recommendations on how to normalize functional (or phylogenetic) dissimilarities among species to render sites and regions comparable, and discuss the pros and cons of our approach. The hierarchical approaches of biodiversity in terms of ‘equivalent numbers’ respond to current demands to obtain intuitive, easily interpretable components of biodiversity. The approaches we propose go beyond current developments by considering a hierarchy of spatial scales and unbalanced sampling design. They will provide powerful tools to detect the ecological and evolutionary processes that act differently at different scales. © 2016 The Authors. Methods in Ecology and Evolution © 2016 British Ecological Society |
| Address |
Department of Environmental Biology, University of Rome ‘La Sapienza’, Piazzale Aldo Moro 5, Rome, Italy |
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| Notes |
Export Date: 20 October 2016 |
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no |
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EcoFoG @ webmaster @ |
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697 |
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