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Author Leitão, R.P.; Zuanon, J.; Villéger, S.; Williams, S.E.; Baraloto, C.; Fortunel, C.; Mendonça, F.P.; Mouillot, D.
Title Rare species contribute disproportionately to the functional structure of species assemblages 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 1828 Pages
Keywords (up) Conservation; Extinction; Functional diversity; Null models; Rarity index; Tropical biodiversity
Abstract There is broad consensus that the diversity of functional traits within species assemblages drives several ecological processes. It is also widely recognized that rare species are the first to become extinct following human-induced disturbances. Surprisingly, however, the functional importance of rare species is still poorly understood, particularly in tropical species-rich assemblages where the majority of species are rare, and the rate of species extinction can be high. Here, we investigated the consequences of local and regional extinctions on the functional structure of species assemblages. We used three extensive datasets (stream fish from the Brazilian Amazon, rainforest trees from French Guiana, and birds from the Australian Wet Tropics) and built an integrative measure of species rarity versuscommonness, combining local abundance, geographical range, andhabitat breadth. Using different scenarios of species loss, we found a disproportionate impact of rare species extinction for the three groups, with significant reductions in levels of functional richness, specialization, and originality of assemblages, which may severely undermine the integrity of ecological processes. The whole breadth of functional abilities within species assemblages, which is disproportionately supported by rare species, is certainly critical in maintaining ecosystems particularly under the ongoing rapid environmental transitions. © 2016 The Author(s) Published by the Royal Society. All rights reserved.
Address Instituto Federal de Educação, Ciência e Tecnologia, Presidente Figueiredo, Brazil
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Notes Export Date: 7 May 2016 Approved no
Call Number EcoFoG @ webmaster @ Serial 676
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Author Dejean, A.; Revel, M.; Azémar, F.; Roux, O.
Title Altruism during predation in an assassin bug Type Journal Article
Year 2013 Publication Naturwissenschaften Abbreviated Journal Naturwissenschaften
Volume 100 Issue 10 Pages 913-922
Keywords (up) Conspecific tolerance; Predation; Prey sharing; Reduviidae; Zelus annulosus
Abstract Zelus annulosus is an assassin bug species mostly noted on Hirtella physophora, a myrmecophyte specifically associated with the ant Allomerus decemarticulatus known to build traps on host tree twigs to ambush insect preys. The Z. annulosus females lay egg clutches protected by a sticky substance. To avoid being trapped, the first three instars of nymphs remain grouped in a clutch beneath the leaves on which they hatched, yet from time to time, they climb onto the upper side to group ambush preys. Long-distance prey detection permits these bugs to capture flying or jumping insects that alight on their leaves. Like some other Zelus species, the sticky substance of the sundew setae on their forelegs aids in prey capture. Group ambushing permits early instars to capture insects that they then share or not depending on prey size and the hunger of the successful nymphs. Fourth and fifth instars, with greater needs, rather ambush solitarily on different host tree leaves, but attract siblings to share large preys. Communal feeding permits faster prey consumption, enabling small nymphs to return sooner to the shelter of their leaves. By improving the regularity of feeding for each nymph, it likely regulates nymphal development, synchronizing molting and subsequently limiting cannibalism. © 2013 Springer-Verlag Berlin Heidelberg.
Address IRD, Maladies Infectieuses et Vecteurs, Ecologie, Genetique, Evolution et Controle (UMR-IRD 224), IRD 01, BP 171, Bobo-Dioulasso, Burkina Faso
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ISSN 00281042 (Issn) ISBN Medium
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Notes Export Date: 30 October 2013; Source: Scopus; Coden: Natwa; doi: 10.1007/s00114-013-1091-9; Language of Original Document: English; Correspondence Address: Dejean, A.; Écologie des Forêts de Guyane, Campus Agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 508
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Author Leroy, C.; Corbara, B.; Dezerald, O.; Trzcinski, M.K.; Carrias, J.-F.; Dejean, A.; Céréghino, R.
Title What drives detrital decomposition in neotropical tank bromeliads? Type Journal Article
Year 2017 Publication Hydrobiologia Abbreviated Journal Hydrobiologia
Volume 802 Issue 1 Pages 85-95
Keywords (up) Context dependency; Ecosystem function; Food webs; Leaf litter; Phytotelmata; Rainforest
Abstract Decomposition experiments that control leaf litter species across environments help to disentangle the roles of litter traits and consumer diversity, but once we account for leaf litter effects, they tell us little about the variance in decomposition explained by shifts in environmental conditions versus food-web structure. We evaluated how habitat, food-web structure, leaf litter species, and the interactions between these factors affect litter mass loss in a neotropical ecosystem. We used water-filled bromeliads to conduct a reciprocal transplant experiment of two litter species between an open and a forested habitat in French Guiana, and coarse- and fine-mesh enclosures embedded within bromeliads to exclude invertebrates or allow them to colonize leaf litter disks. Soft Melastomataceae leaves decomposed faster in their home habitat, whereas tough Eperua leaves decomposed equally in both habitats. Bacterial densities did not differ significantly between the two habitats. Significant shifts in the identity and biomass of invertebrate detritivores across habitats did not generate differences in leaf litter decomposition, which was essentially microbial. Despite the obvious effects of habitats on food-web structure, ecosystem processes are not necessarily affected. Our results pose the question of when does environmental determinism matter for ecosystem functions, and when does it not. © 2017, Springer International Publishing Switzerland.
Address IRD – UMR AMAP, Campus agronomique, BP 316, Kourou Cedex, France
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Notes Export Date: 18 December 2017 Approved no
Call Number EcoFoG @ webmaster @ Serial 775
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Author Srivastava, D.S.; Céréghino, R.; Trzcinski, M.K.; MacDonald, A.A.M.; Marino, N.A.C.; Mercado, D.A.; Leroy, C.; Corbara, B.; Romero, G.Q.; Farjalla, V.F.; Barberis, I.M.; Dézerald, O.; Hammill, E.; Atwood, T.B.; Piccoli, G.C.O.; Ospina-Bautista, F.; 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.
Title Ecological response to altered rainfall differs across the Neotropics Type Journal Article
Year 2020 Publication Ecology Abbreviated Journal Ecology
Volume 101 Issue 4 Pages e02984
Keywords (up) contingency; distributed experiment; freshwater; global change biology; macroinvertebrates; phytotelmata; precipitation; aquatic ecosystem; climate change; climate conditions; ecosystem response; extreme event; functional group; invertebrate; Neotropical Region; rainfall; species pool; Bacteria (microorganisms); Invertebrata; rain; animal; climate change; drought; ecosystem; invertebrate; Animals; Climate Change; Droughts; Ecosystem; Invertebrates; Rain
Abstract There is growing recognition that ecosystems may be more impacted by infrequent extreme climatic events than by changes in mean climatic conditions. This has led to calls for experiments that explore the sensitivity of ecosystems over broad ranges of climatic parameter space. However, because such response surface experiments have so far been limited in geographic and biological scope, it is not clear if differences between studies reflect geographic location or the ecosystem component considered. In this study, we manipulated rainfall entering tank bromeliads in seven sites across the Neotropics, and characterized the response of the aquatic ecosystem in terms of invertebrate functional composition, biological stocks (total invertebrate biomass, bacterial density) and ecosystem fluxes (decomposition, carbon, nitrogen). Of these response types, invertebrate functional composition was the most sensitive, even though, in some sites, the species pool had a high proportion of drought-tolerant families. Total invertebrate biomass was universally insensitive to rainfall change because of statistical averaging of divergent responses between functional groups. The response of invertebrate functional composition to rain differed between geographical locations because (1) the effect of rainfall on bromeliad hydrology differed between sites, and invertebrates directly experience hydrology not rainfall and (2) the taxonomic composition of some functional groups differed between sites, and families differed in their response to bromeliad hydrology. These findings suggest that it will be difficult to establish thresholds of “safe ecosystem functioning” when ecosystem components differ in their sensitivity to climatic variables, and such thresholds may not be broadly applicable over geographic space. In particular, ecological forecast horizons for climate change may be spatially restricted in systems where habitat properties mediate climatic impacts, and those, like the tropics, with high spatial turnover in species composition. © 2020 by the Ecological Society of America
Address Departamento de Ciencias Biológicas, Universidad de Caldas, Caldas, 170001, Colombia
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Publisher Ecological Society of America Place of Publication Editor
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ISSN 00129658 (Issn) ISBN Medium
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Call Number EcoFoG @ webmaster @ Serial 979
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Author 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 (up) 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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Notes Export Date: 17 January 2017 Approved no
Call Number EcoFoG @ webmaster @ Serial 706
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Author Szilagyi, A.; Scheuring, I.; Edwards, D.P.; Orivel, J.; Yu, D.W.
Title The evolution of intermediate castration virulence and ant coexistence in a spatially structured environment Type Journal Article
Year 2009 Publication Ecology Letters Abbreviated Journal Ecol. Lett.
Volume 12 Issue 12 Pages 1306-1316
Keywords (up) Cooperation; evolution of virulence; host-pathogen; mutualism; myrmecophyte; parasite; rock-paper-scissors; spatial games; tolerance; trade-off
Abstract Theory suggests that spatial structuring should select for intermediate levels of virulence in parasites, but empirical tests are rare and have never been conducted with castration (sterilizing) parasites. To test this theory in a natural landscape, we construct a spatially explicit model of the symbiosis between the ant-plant Cordia nodosa and its two, protecting ant symbionts, Allomerus and Azteca. Allomerus is also a castration parasite, preventing fruiting to increase colony fecundity. Limiting the dispersal of Allomerus and host plant selects for intermediate castration virulence. Increasing the frequency of the mutualist, Azteca, selects for higher castration virulence in Allomerus, because seeds from Azteca-inhabited plants are a public good that Allomerus exploits. These results are consistent with field observations and, to our knowledge, provide the first empirical evidence supporting the hypothesis that spatial structure can reduce castration virulence and the first such evidence in a natural landscape for either mortality or castration virulence.
Address [Edwards, David P.; Yu, Douglas W.] Univ E Anglia, Sch Biol Sci, Norwich NR4 7TJ, Norfolk, England, Email: dougwyu@gmail.com
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Publisher WILEY-BLACKWELL PUBLISHING, INC Place of Publication Editor
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ISSN 1461-023X ISBN Medium
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Notes ISI:000271631500006 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 192
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Author Baudrimont, M.; Arini, A.; Guégan, C.; Venel, Z.; Gigault, J.; Pedrono, B.; Prunier, J.; Maurice, L.; Ter Halle, A.; Feurtet-Mazel, A.
Title Ecotoxicity of polyethylene nanoplastics from the North Atlantic oceanic gyre on freshwater and marine organisms (microalgae and filter-feeding bivalves) Type Journal Article
Year 2020 Publication Environmental Science and Pollution Research Abbreviated Journal Environ. Sci. Pollut. Res.
Volume 27 Issue 4 Pages 3746-3755
Keywords (up) Cordicula fluminea; Ecotoxicity; Nanoplastics; Polyethylene; Scenedesmus subspicatus; Thalassiosira weissiflogii; bivalve; concentration (composition); ecotoxicology; filter feeder; gyre; microalga; nanoparticle; plastic waste; pollution exposure; polymer; Atlantic Ocean; Atlantic Ocean (North); Bivalvia; Chlorophyta; Corbicula fluminea; Desmodesmus subspicatus; Nitzschia alba; Thalassiosira
Abstract Each year, 5 to 10 million tons of plastic waste is dumped in the oceans via freshwaters and accumulated in huge oceanic gyres. Under the effect of several abiotic factors, macro plastic wastes (or plastic wastes with macro sizes) are fractionated into microplastics (MP) and finally reach the nanometric size (nanoplastic NP). To reveal potential toxic impacts of these NPs, two microalgae, Scenedemus subspicatus (freshwater green algae), and Thalassiosira weissiflogii (marine diatom) were exposed for up to 48 h at 1, 10, 100, 1000, and 10,000 μg/L to reference polyethylene NPs (PER) or NPs made from polyethylene collected in the North Atlantic gyre (PEN, 7th continent expedition in 2015). Freshwater filter-feeding bivalves, Corbicula fluminea, were exposed to 1000 μg/L of PER and PEN for 48 h to study a possible modification of their filtration or digestion capacity. The results show that PER and PEN do not influence the cell growth of T. weissiflogii, but the PEN exposure causes growth inhibition of S. subspicatus for all exposure concentrations tested. This growth inhibition is enhanced for a higher concentration of PER or PEN (10,000 μg/L) in S. subspicatus. The marine diatom T. weissiflogii appears to be less impacted by plastic pollution than the green algae S. subspicatus for the exposure time. Exposure to NPs does not lead to any alteration of bivalve filtration; however, fecal and pseudo-fecal production increased after PEN exposure, suggesting the implementation of rejection mechanisms for inedible particles. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Address UMR IMRCP 5623, Université Paul Sabatier, CNRS, 118, route de Narbonne, Toulouse, 31062, France
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Publisher Springer Place of Publication Editor
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ISSN 09441344 (Issn) ISBN Medium
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Notes Cited By :1; Export Date: 23 March 2020; Coden: Esple; Correspondence Address: Baudrimont, M.; UMR EPOC 5805, Université de Bordeaux—CNRS, Place du Dr Peyneau, France; email: magalie.baudrimont@u-bordeaux.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 925
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Author Suedile, F.; Robert, F.; Roos, C.; Lebrini, M.
Title Corrosion inhibition of zinc by Mansoa alliacea plant extract in sodium chloride media: Extraction, Characterization and Electrochemical Studies Type Journal Article
Year 2014 Publication Electrochimica Acta Abbreviated Journal Electrochim Acta
Volume 133 Issue Pages 631-638
Keywords (up) Corrosion; Inhibition; Mansoa alliacea; sodium chloride; zinc
Abstract Ethanol extract of Mansoa alliacea was tested as corrosion inhibitor for zinc in NaCl 3% media using polarization and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization curves indicated that the plant extract behaves as mixed-type inhibitor. Impedance measurements showed that there are two phenomena in the process of inhibition. The results obtained show that this plant extract could serve as an effective inhibitor for the corrosion of zinc in NaCl 3% media. The extract obtained give inhibition around 90%. The experimental data obtained from EIS method show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPEα,Q) has been used. Graphical methods are illustrated by synthetic data to determine the parameter of CPE (α, Q). Polarization curves show that Mansoa alliacea extract affects the anodic and cathodic reactions and the corrosion potential values were shifted to the positive potentials in the presence of the crude extract. Studies on the phytochemical constituents of the total extract were also established. Electrochemical studies, on the chemical families present in the crude extract, were also carried out to find the main constituents responsible for corrosion inhibition properties of the plant extract. © 2014 Elsevier Ltd.
Address Laboratoire Matériaux et Molécules en Milieux Amazonien, UAG – UMR ECOFOG Campus Troubiran, Route de Baduel, 97337 Cayenne, French Guiana
Corporate Author Thesis
Publisher Elsevier Ltd Place of Publication Editor
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ISSN 00134686 (Issn) ISBN Medium
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Notes Export Date: 18 June 2014; Coden: Elcaa; Correspondence Address: Lebrini, M.; Laboratoire Matériaux et Molécules en Milieux Amazonien, UAG – UMR ECOFOG Campus Troubiran, Route de Baduel, 97337 Cayenne, French Guiana; email: mounim.lebrini@guyane.univ-ag.fr Approved no
Call Number EcoFoG @ webmaster @ Serial 548
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Author Baraloto, C.; Forget, P.M.
Title Seed size, seedling morphology, and response to deep shade and damage in neotropical rain forest trees Type Journal Article
Year 2007 Publication American Journal of Botany Abbreviated Journal Am. J. Bot.
Volume 94 Issue 6 Pages 901-911
Keywords (up) cotyledons; French Guiana; functional morphology; herbivory; life history; phylogeny; regeneration strategy; shade tolerance
Abstract To investigate the existence of coordinated sets of seedling traits adapted to contrasting establishment conditions, we examined evolutionary convergence in seedling traits for 299 French Guianan woody plant species and the stress response in a shadehouse of species representing seed size gradients within five major cotyledon morphology types. The French Guianan woody plant community has larger seeds than other tropical forest communities and the largest proportion of hypogeal cotyledon type (59.2%) reported for tropical forests. Yet the community includes many species with intermediate size seeds that produce seedlings with different cotyledonal morphologies. A split-plot factorial design with two light levels (0.8% and 16.1% PAR) and four damage treatments (control, seed damage, leaf damage, stem damage) was used in the shadehouse experiment. Although larger-seeded species had higher survival and slower growth, these patterns were better explained by cotyledon type than by seed mass. Even larger-seeded species with foliar cotyledons grew faster than species with reserve-type cotyledons, and survival after stem grazing was five times higher in seedlings with hypogeal cotyledons than with epigeal cotyledons. Thus, to predict seedling performance using seed size, seedling morphology must also be considered.
Address Inst Natl Rech Agronom, UMR, Ecol Forets Guyane, Kourou, France, Email: baraloto.c@kourou.cirad.fr
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Publisher BOTANICAL SOC AMER INC Place of Publication Editor
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ISSN 0002-9122 ISBN Medium
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Notes ISI:000249830600001 Approved no
Call Number EcoFoG @ eric.marcon @ Serial 159
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Author Hmimina, G.; Dufrêne, E.; Pontailler, J.-Y.; Delpierre, N.; Aubinet, M.; Caquet, B.; de Grandcourt, A.; Burban, B.; Flechard, C.; Granier, A.; Gross, P.; Heinesch, B.; Longdoz, B.; Moureaux, C.; Ourcival, J.-M.; Rambal, S.; Saint André, L.; Soudani, K.
Title Evaluation of the potential of MODIS satellite data to predict vegetation phenology in different biomes: An investigation using ground-based NDVI measurements Type Journal Article
Year 2013 Publication Remote Sensing of Environment Abbreviated Journal
Volume 132 Issue Pages 145-158
Keywords (up) Crops; Deciduous forests; Evergreen forests; Ground-based NDVI; Modis; Phenology
Abstract Vegetation phenology is the study of the timing of seasonal events that are considered to be the result of adaptive responses to climate variations on short and long time scales. In the field of remote sensing of vegetation phenology, phenological metrics are derived from time series of optical data. For that purpose, considerable effort has been specifically focused on developing noise reduction and cloud-contaminated data removal techniques to improve the quality of remotely-sensed time series. Comparative studies between time series composed of satellite data acquired under clear and cloudy conditions and from radiometric data obtained with high accuracy from ground-based measurements constitute a direct and effective way to assess the operational use and limitations of remote sensing for predicting the main plant phenological events. In the present paper, we sought to explicitly evaluate the potential use of MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing data for monitoring the seasonal dynamics of different types of vegetation cover that are representative of the major terrestrial biomes, including temperate deciduous forests, evergreen forests, African savannah, and crops. After cloud screening and filtering, we compared the temporal patterns and phenological metrics derived from in situ NDVI time series and from MODIS daily and 16-composite products. We also evaluated the effects of residual noise and the influence of data gaps in MODIS NDVI time series on the identification of the most relevant metrics for vegetation phenology monitoring. The results show that the inflexion points of a model fitted to a MODIS NDVI time series allow accurate estimates of the onset of greenness in the spring and the onset of yellowing in the autumn in deciduous forests (RMSE ≤ one week). Phenological metrics identical to those provided with the MODIS Global Vegetation Phenology product (MDC12Q2) are less robust to data gaps, and they can be subject to large biases of approximately two weeks or more during the autumn phenological transitions. In the evergreen forests, in situ NDVI time series describe the phenology with high fidelity despite small temporal changes in the canopy foliage. However, MODIS is unable to provide consistent phenological patterns. In crops and savannah, MODIS NDVI time series reproduce the general temporal patterns of phenology, but significant discrepancies appear between MODIS and ground-based NDVI time series during very localized periods of time depending on the weather conditions and spatial heterogeneity within the MODIS pixel. In the rainforest, the temporal pattern exhibited by a MODIS 16-day composite NDVI time series is more likely due to a pattern of noise in the NDVI data structure according to both rainy and dry seasons rather than to phenological changes. More investigations are needed, but in all cases, this result leads us to conclude that MODIS time series in tropical rainforests should be interpreted with great caution. © 2013 Elsevier Inc.
Address INRA, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, France
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Notes Export Date: 21 February 2013; Source: Scopus Approved no
Call Number EcoFoG @ webmaster @ Serial 467
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