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Denis, T.; Hérault, B.; Brunaux, O.; Guitet, S.; Richard-Hansen, C. |
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Title |
Weak environmental controls on the composition and diversity of medium and large-sized vertebrate assemblages in neotropical rain forests of the Guiana Shield |
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Journal Article |
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Year |
2018 |
Publication |
Diversity and Distributions |
Abbreviated Journal |
Diversity Distrib. |
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24 |
Issue |
11 |
Pages |
1545-1559 |
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biodiversity; birds; functional traits; mammals; refugia hypothesis; spatial patterns; Aves; Mammalia; Vertebrata |
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Aim: Despite their often high-trophic position and their contribution to many ecosystem functions, little is known about the factors affecting assemblage structure of medium- and large-sized neotropical vertebrates. We examined the relative roles played by the physical and biological environment, and by purely spatial processes, in shaping the composition and diversities of these vertebrate assemblages. Then, based on the theory that the Guianan forest cover shrank to isolated pockets during the late Pleistocene–Holocene, we tested if the past forest refugia may have shaped current vertebrate assemblages. Location: French Guiana, Guiana Shield, South America. Methods: Abundances of 19 medium- and large-sized vertebrates were estimated at 21 locations in undisturbed Guianan rain forests. Using taxonomic, functional and phylogenetic metrics, we partitioned the effects of a range of physical and biological environmental conditions and purely spatial predictors in shaping both assemblage composition and (alpha and beta) diversities. Results: We identified a significant, but weak relationship between taxonomic, functional and phylogenetic assemblage composition and environmental conditions. Assemblage diversity patterns were mainly explained by spatial predictors irrespective of the metrics. Current assemblage diversities are correlated with Pleistocene–Holocene forest history, with the highest alpha diversities outside of putative forest refugia, and the highest beta diversities inside these areas. Main conclusions: Current vertebrate assemblage composition is not strongly marked by common environmental factors. Our main conclusion is that assemblage composition results from individual species responses to the environment. Our findings also suggest that dispersal-related processes or more probably historical processes shape (alpha and beta) diversity patterns. In fact, forest fragmentation during Pleistocene–Holocene climate changes could have led to isolated vertebrate assemblages evolving into unique species assemblages creating the current high beta diversity inside refugia, whereas the lower habitat stability outside of refugia could have led to mixed assemblages in areas recolonized by forest vertebrates (current high alpha diversity outside of refugia). |
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IRD, UMR AMAP (Cirad, CNRS, INRA, Université de Montpellier), Montpellier, France |
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Blackwell Publishing Ltd |
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13669516 (Issn) |
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EcoFoG @ webmaster @ |
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833 |
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Jaouen, G.; Sagne, A.; Buyck, B.; Decock, C.; Louisanna, E.; Manzi, S.; Baraloto, C.; Roy, M.; Schimann, H. |
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Title |
Fungi of French Guiana gathered in a taxonomic, environmental and molecular dataset |
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Journal Article |
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2019 |
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Scientific data |
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6 |
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206 |
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In Amazonia, the knowledge about Fungi remains patchy and biased towards accessible sites. This is particularly the case in French Guiana where the existing collections have been confined to few coastal localities. Here, we aimed at filling the gaps of knowledge in undersampled areas of this region, particularly focusing on the Basidiomycota. From 2011, we comprehensively collected fruiting-bodies with a stratified and reproducible sampling scheme in 126 plots. Sites of sampling reflected the main forest habitats of French Guiana in terms of soil fertility and topography. The dataset of 5219 specimens gathers 245 genera belonging to 75 families, 642 specimens are barcoded. The dataset is not a checklist as only 27% of the specimens are identified at the species level but 96% are identified at the genus level. We found an extraordinary diversity distributed across forest habitats. The dataset is an unprecedented and original collection of Basidiomycota for the region, making specimens available for taxonomists and ecologists. The database is publicly available in the GBIF repository ( https://doi.org/10.15468/ymvlrp ). |
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Department of Biological Science, Florida International University, FL, Miami, 33199, United States |
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Export Date: 28 October 2019 |
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EcoFoG @ webmaster @ |
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891 |
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Salas-Lopez, A.; Violle, C.; Mallia, L.; Orivel, J. |
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Title |
Land-use change effects on the taxonomic and morphological trait composition of ant communities in French Guiana |
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Journal Article |
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Year |
2018 |
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Insect Conservation and Diversity |
Abbreviated Journal |
Insect Conserv Divers |
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11 |
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2 |
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162-173 |
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Community assembly; Formicidae; functional diversity; gradient analysis; habitat filtering; land-use intensification; n-dimensional hypervolume approach |
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Abstract Land-use changes frequently lead to major changes in the composition and diversity of organisms. A reduction in the range of strategies enabling organisms to survive in a given environment and changes in the average trait values of species may potentially be associated with variations in species? number and identity. We investigated the variation in ant taxonomic composition and morphological trait diversity along a land-use gradient in French Guiana. We measured 13 core ant morphological traits on all species sampled. We then selected the set of five traits that best captured changes along the land-use gradient. Potential effects of the variation in morphological trait diversity and average values were evaluated by examining morphological traits individually as well as in combination. We found that variation in taxonomic diversity was unrelated to the plot-level morphospace. Conversely, a significant shift in taxonomic composition was accompanied by changes in the average values of community traits along the studied gradient, examined both individually and in combination. We argue that morphological trait values may be related to the success of different species in surviving in a given environment and, therefore, are indicative of the taxonomic turnover in ants along the land-use gradient. Nevertheless, in contradiction with theoretical expectations, the morphospace is only slightly affected by habitat filtering and loosely impacted by taxonomic changes. Examining the sensitivity of the morphospace to abiotic and biotic factors and how it reflects varying ecological pressures for species is thus of the utmost importance. |
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John Wiley & Sons, Ltd (10.1111) |
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1752-458x |
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doi: 10.1111/icad.12248 |
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EcoFoG @ webmaster @ |
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892 |
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Orivel, J.; Klimes, P.; Novotny, V.; Leponce, M. |
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Resource use and food preferences in understory ant communities along a complete elevational gradient in Papua New Guinea |
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Journal Article |
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Year |
2018 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
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50 |
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4 |
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641-648 |
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altitudinal gradient; food resources; Formicidae; Mt Wilhelm; nutritional ecology |
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Elevational gradients provide an interesting opportunity for studying the effect of climatic drivers over short distances on the various facets of biodiversity. It is globally assumed that the decrease in species richness with increasing elevation follows mainly the decrease in ecosystem productivity, but studies on functional diversity still remain limited. Here, we investigated how resource use and food preferences by both individual ant species and communities foraging in the understory vary with elevation along a complete elevational gradient (200 to 3200 m asl). Five bait types reflecting some of the main ecosystem processes in which ants are involved were tested: mutualism (sucrose and melezitose), predation (live termites), and detritivory (crushed insects and chicken feces). The observed monotonic decrease in both species richness and occurrences with elevation increase was accompanied by changes in some of the tested ecosystem processes. Such variations can be explained by resource availability and/or resource limitation: Predation and bird feces removal decreased with increasing elevation possibly reflecting a decline in species able to use these resources, while insect detritivory and nectarivory were most probably driven by resource limitation (or absence of limitation), as their relative use did not change along the gradient. Consequently, resource attractiveness (i.e., food preferences at the species level) appears as an important factor in driving community structuring in ants together with the abiotic environmental conditions. |
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John Wiley & Sons, Ltd (10.1111) |
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0006-3606 |
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doi: 10.1111/btp.12539 |
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EcoFoG @ webmaster @ |
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893 |
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Sprenger, P.P.; Hartke, J.; Feldmeyer, B.; Orivel, J.; Schmitt, T.; Menzel, F. |
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Influence of Mutualistic Lifestyle, Mutualistic Partner, and Climate on Cuticular Hydrocarbon Profiles in Parabiotic Ants |
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Journal Article |
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2019 |
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Journal of Chemical Ecology |
Abbreviated Journal |
J Chem Ecol |
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45 |
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9 |
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741-754 |
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A vital trait in insects is their cuticular hydrocarbon (CHC) profile, which protects the insect against desiccation and serves in chemical communication. Due to these functions, CHC profiles are shaped by both climatic conditions and biotic interactions. Here, we investigated CHC differentiation in the neotropical parabiotic ant species Crematogaster levior and Camponotus femoratus, which mutualistically share a nest. Both consist of two cryptic species each (Cr. levior A and B and Ca. femoratus PAT and PS) that differ genetically and possess strongly different CHC profiles. We characterized and compared CHC profiles of the four cryptic species in detail. Our results suggest that Cr. levior A, Ca. femoratus PAT and Ca. femoratus PS adapted their CHC profiles to the parabiotic lifestyle by producing longer-chain CHCs. At the same time, they changed their major CHC classes, and produce more alkadienes and methyl-branched alkenes compared to Cr. levior B or non-parabiotic species. The CHC profiles of Cr. levior B were more similar to related, non-parabiotic species of the Orthocrema clade than Cr. levior A, and the chain lengths of B were similar to the reconstructed ancestral state. Signals of both the parabiotic partner (biotic conditions) and climate (abiotic conditions) were found in the CHC profiles of all four cryptic species. Our data suggest that mutualisms shaped the CHC profiles of the studied species, in particular chain length and CHC class composition. Beside this, signals of the parabiotic partners indicate potential impacts of biotic interactions, via chemical mimicry or chemical camouflage. |
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1573-1561 |
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EcoFoG @ webmaster @ Sprenger2019 |
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894 |
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Fu, T.; Houel, E.; Amusant, N.; Touboul, D.; Genta-Jouve, G.; Della-Negra, S.; Fisher, G.L.; Brunelle, A.; Duplais, C. |
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Biosynthetic investigation of γ-lactones in Sextonia rubra wood using in situ TOF-SIMS MS/MS imaging to localize and characterize biosynthetic intermediates |
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Journal Article |
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2019 |
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Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
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9 |
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1928 |
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Molecular analysis by parallel tandem mass spectrometry (MS/MS) imaging contributes to the in situ characterization of biosynthetic intermediates which is crucial for deciphering the metabolic pathways in living organisms. We report the first use of TOF-SIMS MS/MS imaging for the cellular localization and characterization of biosynthetic intermediates of bioactive γ-lactones rubrynolide and rubrenolide in the Amazonian tree Sextonia rubra (Lauraceae). Five γ-lactones, including previously reported rubrynolide and rubrenolide, were isolated using a conventional approach and their structural characterization and localization at a lateral resolution of ~400 nm was later achieved using TOF-SIMS MS/MS imaging analysis. 2D/3D MS imaging at subcellular level reveals that putative biosynthetic γ-lactones intermediates are localized in the same cell types (ray parenchyma cells and oil cells) as rubrynolide and rubrenolide. Consequently, a revised metabolic pathway of rubrynolide was proposed, which involves the reaction between 2-hydroxysuccinic acid and 3-oxotetradecanoic acid, contrary to previous studies suggesting a single polyketide precursor. Our results provide insights into plant metabolite production in wood tissues and, overall, demonstrate that combining high spatial resolution TOF-SIMS imaging and MS/MS structural characterization offers new opportunities for studying molecular and cellular biochemistry in plants. © 2019, The Author(s). |
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Physical Electronics, Chanhassen, MN 55317, United States |
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Nature Publishing Group |
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20452322 (Issn) |
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EcoFoG @ webmaster @ |
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866 |
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Dejean, A.; Compin, A.; Delabie, J.H.C.; Azémar, F.; Corbara, B.; Leponce, M. |
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Biotic and abiotic determinants of the formation of ant mosaics in primary Neotropical rainforests |
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Journal Article |
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2019 |
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Ecological Entomology |
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Ecol Entomol |
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44 |
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4 |
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560-570 |
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Ant mosaics; connections on the ground; host tree attractiveness; indicators of disturbance; primary Neotropical rainforest; territoriality |
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1. Ants are widespread in tropical rainforests, including in the canopy where territorially dominant arboreal species represent the main part of the arthropod biomass.
2. By mapping the territories of dominant arboreal ant species and using a null model analysis and a pairwise approach this study was able to show the presence of an ant mosaic on the upper canopy of a primary Neotropical rainforest (c. 1ha sampled; 157 tall trees from 28 families). Although Neotropical rainforest canopies are frequently irregular, with tree crowns at different heights breaking the continuity of the territories of dominant ants, the latter are preserved via underground galleries or trails laid on the ground.
3. The distribution of the trees influences the structure of the ant mosaic, something related to the attractiveness of tree taxa for certain arboreal ant species rather than others.
4. Small-scale natural disturbances, most likely strong winds in the area studied (presence of canopy gaps), play a role by favouring the presence of two ant species typical of secondary formations: Camponotus femoratus and Crematogaster levior, which live in parabiosis (i.e. share territories and nests but lodge in different cavities) and build conspicuous ant gardens. In addition, pioneer Cecropia myrmecophytic trees were recorded. |
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John Wiley & Sons, Ltd (10.1111) |
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0307-6946 |
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doi: 10.1111/een.12735 |
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EcoFoG @ webmaster @ |
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882 |
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Leponce, M.;Delabie, J.H.C.;Orivel, J.;Jacquemin, J.;Calvo Martin, M.;Dejean, A. |
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Tree-dwelling ant survey (Hymenoptera, Formicidae) in Mitaraka, French Guiana |
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Journal Article |
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2019 |
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Zoosystema |
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40 |
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sp1 |
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163-179 |
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Ants constitute a substantial part of the arthropod biomass in rainforests. Most studies have focused on ground-dwelling ants, which constitute almost half of the diversity of the ant assemblage. We report here the results of the first survey of tree-dwelling ants in French Guiana on a plateau and in a swamp palm forest (Euterpe oleracea Mart.) in the Mitaraka Mountains. We were interested in seeing the effect of topography and geographic distance on species richness and composition and to gather information on the species distribution on tree trunks. The fauna of Mitaraka was compared with one from a site 350 km distant (Petit Saut). In total 105 trees were sampled (30, 30, 45 in the plateau and the swamp forests of Mitaraka, and in Petit Saut plateau forest, respectively). Arboreal ants were attracted using tuna and honey baits spread along a rope reaching an upper branch, except for the palm swamp forest where the baits were only placed at 2 m high. A total of 34, 13 and 22 species were observed in these three respective sites. Six of these species are new records for French Guiana. In Mitaraka Camponotus femoratus (Fabricius, 1804) and Crematogaster leviorLongino, 2003 co-occurred on trees (parabiotic association) and were among the most common species, along with Crematogaster tenuiculaForel, 1904 which was found on other trees (species exclusion). The Mitaraka Mountains appeared more species rich and had a species composition distinct from Petit Saut. Topography also influenced ant species composition. Almost half of the species collected by the baitline method were exclusively foraging in the canopy. |
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EcoFoG @ webmaster @ |
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883 |
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Peguero, G.; Sardans, J.; Asensio, D.; Fernández-Martínez, M.; Gargallo-Garriga, A.; Grau, O.; Llusià, J.; Margalef, O.; Márquez, L.; Ogaya, R.; Urbina, I.; Courtois, E.A.; Stahl, C.; Van Langenhove, L.; Verryckt, L.T.; Richter, A.; Janssens, I.A.; Peñuelas, J. |
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Nutrient scarcity strengthens soil fauna control over leaf litter decomposition in tropical rainforests |
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Journal Article |
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2019 |
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Proceedings. Biological sciences |
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Proc. Biol. Sci. |
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286 |
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1910 |
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20191300 |
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biogeochemistry; extracellular enzyme activity; litter decomposition; nutrients; soil fauna |
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Soil fauna is a key control of the decomposition rate of leaf litter, yet its interactions with litter quality and the soil environment remain elusive. We conducted a litter decomposition experiment across different topographic levels within the landscape replicated in two rainforest sites providing natural gradients in soil fertility to test the hypothesis that low nutrient availability in litter and soil increases the strength of fauna control over litter decomposition. We crossed these data with a large dataset of 44 variables characterizing the biotic and abiotic microenvironment of each sampling point and found that microbe-driven carbon (C) and nitrogen (N) losses from leaf litter were 10.1 and 17.9% lower, respectively, in the nutrient-poorest site, but this among-site difference was equalized when meso- and macrofauna had access to the litterbags. Further, on average, soil fauna enhanced the rate of litter decomposition by 22.6%, and this contribution consistently increased as nutrient availability in the microenvironment declined. Our results indicate that nutrient scarcity increases the importance of soil fauna on C and N cycling in tropical rainforests. Further, soil fauna is able to equalize differences in microbial decomposition potential, thus buffering to a remarkable extent nutrient shortages at an ecosystem level. |
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Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, 1090, Austria |
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NLM (Medline) |
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14712954 (Issn) |
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EcoFoG @ webmaster @ |
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884 |
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Talaga, S.; Dejean, A.; Mouza, C.; Dumont, Y.; Leroy, C. |
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Larval interference competition between the native Neotropical mosquito Limatus durhamii and the invasive Aedes aegypti improves the fitness of both species |
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Journal Article |
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2018 |
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Insect Science |
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Insect Science |
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25 |
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1102-1107 |
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Aedes aegypti; increased fitness; interference competition; Limatus durhamii; phenotypic plasticity; resistance to invasion |
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Abstract Interspecific competition with native species during biological invasions can sometimes limit alien expansion. We aimed to determine the potential ecological effects of Limatus durhamii Theobald 1901, a native Neotropical mosquito (Diptera: Culicidae) species, on the invasive species Aedes (Stegomyia) aegypti (Linnaeus 1762) that breeds in the same artificial water containers. Development time and adult dry mass were measured in 3 rearing conditions: control (a single larva), intraspecific competition (2 conspecific larvae), and interspecific competition (2 heterospecific larvae). Food was provided ad libitum to eliminate exploitative competition. For Ae. aegypti, development time was not affected by interspecific interference competition (nonsignificant differences with the control) and the adult dry mass was significantly higher, meaning that individual fitness likely increased. Yet, because previous studies showed longer development time and lighter adults during competition with other invasive mosquitoes, it is likely that Ae. aegypti can express a different phenotype depending on the competing species. The similar pattern found for Li. durhamii females and the nonsignificant difference with the control for males explain in part why this species can compete with Ae. aegypti. |
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John Wiley & Sons, Ltd (10.1111) |
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Conference |
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|
Notes |
|
Approved |
no |
|
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Call Number |
EcoFoG @ webmaster @ |
Serial |
836 |
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Permanent link to this record |