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Zinger, L.; Chave, J.; Coissac, E.; Iribar, A.; Louisanna, E.; Manzi, S.; Schilling, V.; Schimann, H.; Sommeria-Klein, G.; Taberlet, P. |
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Extracellular DNA extraction is a fast, cheap and reliable alternative for multi-taxa surveys based on soil DNA |
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2016 |
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Soil Biology and Biochemistry |
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Soil Biology and Biochemistry |
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96 |
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16-19 |
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DNA extraction protocol; DNA metabarcoding; Multi-taxa biodiversity; Tropical forest |
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DNA metabarcoding on soil samples is increasingly used for large-scale and multi-taxa biodiversity studies. However, DNA extraction may be a major bottleneck for such wide uses. It should be cost/time effective and allow dealing with large sample volumes so as to maximise the representativeness of both micro- and macro-organisms diversity. Here, we compared the performances of a fast and cheap extracellular DNA extraction protocol with a total DNA extraction method in retrieving bacterial, eukaryotic and plant diversity from tropical soil samples of ca. 10 g. The total DNA extraction protocol yielded more high-quality DNA. Yet, the extracellular DNA protocol provided similar diversity assessments although it presented some differences in clades relative abundance and undersampling biases. We argue that extracellular DNA is a good compromise between cost, labor, and accuracy for high-throughput DNA metabarcoding studies of soil biodiversity. © 2016 Elsevier Ltd. |
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INRA UMR ECOFOG, Kourou, French Guiana |
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Export Date: 17 February 2016 |
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EcoFoG @ webmaster @ |
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663 |
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Houadria, M.; Blüthgen, N.; Salas-Lopez, A.; Schmitt, M.-I.; Arndt, J.; Schneider, E.; Orivel, J.; Menzel, F. |
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The relation between circadian asynchrony, functional redundancy, and trophic performance in tropical ant communities |
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Journal Article |
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2016 |
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Ecology |
Abbreviated Journal |
Ecology |
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97 |
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1 |
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225-235 |
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Diel turnover; Ecosystem functioning; Functional diversity; Multifunctional redundancy; Sampling effect; Temporal partitioning; Tropical rain forests |
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The diversity-stability relationship has been under intense scrutiny for the past decades, and temporal asynchrony is recognized as an important aspect of ecosystem stability. In contrast to relatively well- studied interannual and seasonal asynchrony, few studies investigate the role of circadian cycles for ecosystem stability. Here, we studied multifunctional redundancy of diurnal and nocturnal ant communities in four tropical rain forest sites. We analyzed how it was influenced by species richness, functional performance, and circadian asynchrony. In two neotropical sites, species richness and functional redundancy were lower at night. In contrast, these parameters did not differ in the two paleotropical sites we studied. Circadian asynchrony between species was pronounced in the neotropical sites, and increased circadian functional redundancy. In general, species richness positively affected functional redundancy, but the effect size depended on the temporal and spatial breadth of the species with highest functional performance. Our analysis shows that high levels of trophic performance were only reached through the presence of such high- performing species, but not by even contributions of multiple, less- efficient species. Thus, these species can increase current functional performance, but reduce overall functional redundancy. Our study highlights that diurnal and nocturnal ecosystem properties of the very same habitat can markedly differ in terms of species richness and functional redundancy. Consequently, like the need to study multiple ecosystem functions, multiple periods of the circadian cycle need to be assessed in order to fully understand the diversity- stability relationship in an ecosystem. © 2016 by the Ecological Society of America. |
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CNRS, UMR Ecologie des Forêts de Guyane, BP 709, Kourou Cedex, France |
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Export Date: 17 February 2016 |
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EcoFoG @ webmaster @ |
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664 |
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Doughty, C.E.; Wolf, A.; Baraloto, C.; Malhi, Y. |
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Interdependency of plants and animals in controlling the sodium balance of ecosystems and the impacts of global defaunation |
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2016 |
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Ecography |
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Ecography |
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39 |
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2 |
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204-212 |
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Sodium, an element which is needed by animals but often toxic in high concentrations to plants, may be deficient and limit animal abundance in inland continental regions, but may be overabundant and limit plant productivity in coastal regions. Here we present data from 50 independent plots (including leaf data from more than 2480 individual trees) showing that leaves in the Amazon basin uptake high amounts of sodium (Na) in a manner more similar to the essential cation potassium (K) than to the toxic cation aluminium (Al). Leaf Na increases linearly with soil Na concentrations, and there is no apparent mechanism for selective exclusion of Na in comparison to K, a key attribute of halophytes. This indicates that the Amazon basin is broadly non-halophytic and increased sodium concentrations in non-halophyte plants often decrease plant productivity. Total Na concentrations are ∼ 10 times higher in coastal regions than inland regions. Such concentration gradients in nutrients may have been reduced in the past because large animals that were abundant in the Pleistocene have been hypothesized to play a large role in reducing nutrient concentration gradients at continental scales. We use a diffusion model and a Na loss rate based on empirical data to estimate that large animals may have moved significant quantities of Na inland away from coastal regions in the Amazon Basin. Therefore, our simple model suggests that large animals may play an important, yet diminishing, role in maintaining the sodium balance of the planet. © 2016 Nordic Society Oikos. |
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INRA UMR Ecologie des Forêts de Guyane, French Guiana, and International Center for Tropical Botany, Dept of Biological Sciences, Florida International Univ., Miami, United States |
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Cited By :2; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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657 |
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Lamarre, G.P.A.; Amoretti, D.S.; Baraloto, C.; Bénéluz, F.; Mesones, I.; Fine, P.V.A. |
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Phylogenetic Overdispersion in Lepidoptera Communities of Amazonian White-sand Forests |
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Journal Article |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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1 |
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101-109 |
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varillales; Amazon basin; Bottom-up; Lepidoptera composition; Moth, Nymphalidae; Phylogenetic structure |
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In the Amazon basin and the Guiana Shield, white-sand (WS) forests are recognized as a low-resource habitat often composed by a distinct flora with many edaphic endemic plants. Small patches of nutrient-poor white-sand forests can pose a series of challenges to plants and animals. For plants, these challenges have been shown to function as strong filters that in turn drive taxonomic, functional and phylogenetic plant composition. However, very little is known about animal communities in WS forest and the effect that low-resource availability may have on higher trophic levels. Here, we investigate the diversity of both taxonomic and phylogenetic diversity of three Lepidoptera families' (Nymphalidae, Saturniidae, and Sphingidae) assemblages between low-resource (White-Sand Forest) and two adjacent high-resource habitats, terra firme clay and seasonally flooded forests. We found no clear effect of habitat type on taxonomic composition although butterfly and moth species abundance differed among the three contrasted habitats. The WS forest Lepidoptera community is significantly more phylogenetically overdispersed than expected by chance. We suggest that these low-resource habitats filter the number of plant lineages which, in turn, creates a bottom-up control structuring Lepidoptera phylogenetic structure. We recommend long-term sampling on Lepidoptera community both at larval and adult stages that may complement this study and test hypotheses linking herbivore phylogenetic structure to plant resource availability and trophic cascade theory. © 2016 The Association for Tropical Biology and Conservation. |
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Department of Biological Sciences, International Center for Tropical Botany, Florida International University, Miami, FL, United States |
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Cited By :1; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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661 |
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Fine, P.V.A.; Baraloto, C. |
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Habitat Endemism in White-sand Forests: Insights into the Mechanisms of Lineage Diversification and Community Assembly of the Neotropical Flora |
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Journal Article |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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1 |
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24-33 |
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Amazon; Endemic; Functional traits; Habitat specialization; Niche conservatism; Speciation |
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White-sand forests represent natural laboratories of evolution over their long history throughout Amazonia and the Guiana Shield and pose significant physiological challenges to the plants and animals they host. The study of diversification in plant lineages comprising species endemic to white-sand forest can therefore give insights into processes of evolution and community assembly in tropical forests. In this article, we synthesize recent studies of white-sand forests to integrate patterns of plant species distribution with processes of lineage diversification and community assembly in the white-sand flora. We contrast lineages that have radiated uniquely in these habitats (e.g., Pagamea, Rubiaceae), with cosmopolitan lineages comprising specialists to white-sand forests and other habitats that may have arisen via ecological speciation across habitat gradients (e.g., Protium, Burseraceae). In both cases, similar suites of functional traits have evolved, including investment in dense, long-lived tissues that are well-defended structurally and chemically. White-sand endemics, therefore, play an important role in biodiversity conservation because they represent unique combinations of functional and phylogenetic diversity. Furthermore, white-sand endemics may respond differently than other tropical forest plant species to contemporary global changes because they comprise resilient functional types that may better withstand increased drought, temperature, and invasions of exotic pests in these regions. © 2016 The Association for Tropical Biology and Conservation. |
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Department of Biological Sciences and International Center for Tropical Botany, Florida International University, Miami, FL, United States |
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Cited By :3; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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659 |
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Roy, M.; Schimann, H.; Braga-Neto, R.; Da Silva, R.A.E.; Duque, J.; Frame, D.; Wartchow, F.; Neves, M.A. |
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Diversity and Distribution of Ectomycorrhizal Fungi from Amazonian Lowland White-sand Forests in Brazil and French Guiana |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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1 |
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90-100 |
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campina; campinarana; Amanitaceae; Amanitaceae; Boletaceae; Boletaceae; Campina; Campinarana; Herbarium; Herbário; Russulaceae; Russulaceae |
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White-sand forests are thought to host many ectomycorrhizal fungi, as demonstrated by the numerous fruiting body collections made by Rolf Singer in the lower Rio Negro in the late 1970s. Despite recognition of the importance of ectomycorrhizal fungi in white-sand forests, there has not yet been a systematic examination of diversity and taxonomic composition across white-sand forests, or more widely across lowland Amazonian forests. In an effort to broaden our view of ectomycorrhizal fungal diversity and distribution on white-sand forests, we collected ectomycorrhizal fruiting bodies in 10 plots of white-sand forests in Brazil and French Guiana between 2012 and 2014. We collected 221 specimens and 62 morphospecies, from the 10 plots, confirming that all studied white-sand forests host ectomycorrhizal fungi. Additionally, we searched for taxa associated with white sands among specimens deposited in Brazilian herbaria. We report 1006 unique ectomycorrhizal specimen records in 18 Brazilian herbaria, of which 137 specimens and 64 species are reported from white-sand forests, mainly in the state of Amazonas, Brazil. Russulaceae and Amanitaceae were frequent in all habitats, and Cortinarius were more frequent on white sands. Our results highlight the high diversity and heterogeneity of ectomycorrhizal communities on white-sand forests, and the wide distribution of ectomycorrhizal fungi throughout Brazil, irrespective of soil type. © 2016 The Association for Tropical Biology and Conservation. |
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Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, João Pessoa, PB, Brazil |
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Cited By :2; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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658 |
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Guevara, J.E.; Damasco, G.; Baraloto, C.; Fine, P.V.A.; Peñuela, M.C.; Castilho, C.; Vincentini, A.; Cárdenas, D.; Wittmann, F.; Targhetta, N.; Phillips, O.; Stropp, J.; Amaral, I.; Maas, P.; Monteagudo, A.; Jimenez, E.M.; Thomas, R.; Brienen, R.; Duque, A.; Magnusson, W.; Ferreira, C.; Honorio, E.; de Almeida Matos, F.; Arevalo, F.R.; Engel, J.; Petronelli, P.; Vasquez, R.; ter Steege, H. |
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Low Phylogenetic Beta Diversity and Geographic Neo-endemism in Amazonian White-sand Forests |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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1 |
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34-46 |
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Amazon; Neo-endemism; Phylogenetic beta diversity; Recent diversification; White sands |
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Over the past three decades, many small-scale floristic studies of white-sand forests across the Amazon basin have been published. Nonetheless, a basin-wide description of both taxonomic and phylogenetic alpha and beta diversity at regional scales has never been achieved. We present a complete floristic analysis of white-sand forests across the Amazon basin including both taxonomic and phylogenetic diversity. We found strong regional differences in the signal of phylogenetic community structure with both overall and regional Net Relatedness Index and Nearest Taxon Index values found to be significantly positive leading to a pattern of phylogenetic clustering. Additionally, we found high taxonomic dissimilarity but low phylogenetic dissimilarity in pairwise community comparisons. These results suggest that recent diversification has played an important role in the assembly of white-sand forests causing geographic neo-endemism patterns at the regional scale. © 2016 The Association for Tropical Biology and Conservation. |
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Ecology and Biodiversity Group, Utrecht University, Utrecht, Netherlands |
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Cited By :3; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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660 |
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Rodríguez-Pérez, H.; Hilaire, S.; Mesléard, F. |
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Temporary pond ecosystem functioning shifts mediated by the exotic red swamp crayfish (Procambarus clarkii): a mesocosm study |
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2016 |
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Hydrobiologia |
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Hydrobiologia |
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767 |
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1 |
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333-345 |
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Ecosystem functioning; Exotic crayfish; Procambarus clarkii; Temporary pond |
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Temporary ponds, acknowledged for their conservation value, are colonized by the invasive crayfish Procambarus clarkii. We have tested the consequences of this colonization for the ecosystem under two contrasted scenarios: one single individual arrival or three individuals arrival. We recreated the temporary pond ecosystem in 1 m2 tanks to investigate the impact of the two crayfish densities. We studied the macrophyte community composition and abundance, chlorophyll a and total suspended solids concentrations, and the diversity and functional composition of micro-crustacean and macro-invertebrate communities. We observed a reduction of macrophyte biomass in experimental crayfish mesocosms in comparison with control tanks, nearly 80 and 40% less in 3 and 1 crayfish/m2 tanks, respectively. The macrophyte community shifted, followed by a filamentous algae development, an increase of bare sediment and turbidity in crayfish tanks. The macro-invertebrate community suffered a richness loss of 28 and 22%, in 3 and 1 crayfish/m2 tanks, respectively. Functionally, macro-invertebrate diversity reduction most strongly affected the grazer, detritivore and predator trophic groups. Microcrustaceans seemed not to be affected by the introduction of the crayfish. The introduction of the crayfish greatly altered the ecosystem structure and subsequently the ecosystem functioning. © 2015, Springer International Publishing Switzerland. |
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EcoFoG, Ecologie des Forêts de Guyane, CNRS UMR 8172, Campus Agronomique, BP 316, Kourou Cedex, France |
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Export Date: 8 February 2016 |
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EcoFoG @ webmaster @ |
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655 |
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Touchard, A.; Aili, S.R.; Fox, E.G.P.; Escoubas, P.; Orivel, J.; Nicholson, G.M.; Dejean, A. |
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The biochemical toxin arsenal from ant venoms |
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2016 |
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Toxins |
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Toxins |
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8 |
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30 |
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Alkaloids; Ant venom; Enzymes; Formic acid; Peptides; Toxins; Venom biochemistry |
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Ants (Formicidae) represent a taxonomically diverse group of hymenopterans with over 13,000 extant species, the majority of which inject or spray secretions from a venom gland. The evolutionary success of ants is mostly due to their unique eusociality that has permitted them to develop complex collaborative strategies, partly involving their venom secretions, to defend their nest against predators, microbial pathogens, ant competitors, and to hunt prey. Activities of ant venom include paralytic, cytolytic, haemolytic, allergenic, pro-inflammatory, insecticidal, antimicrobial, and pain-producing pharmacologic activities, while non-toxic functions include roles in chemical communication involving trail and sex pheromones, deterrents, and aggregators. While these diverse activities in ant venoms have until now been largely understudied due to the small venom yield from ants, modern analytical and venomic techniques are beginning to reveal the diversity of toxin structure and function. As such, ant venoms are distinct from other venomous animals, not only rich in linear, dimeric and disulfide-bonded peptides and bioactive proteins, but also other volatile and non-volatile compounds such as alkaloids and hydrocarbons. The present review details the unique structures and pharmacologies of known ant venom proteinaceous and alkaloidal toxins and their potential as a source of novel bioinsecticides and therapeutic agents. © 2016 by the authors; licensee MDPI, Basel, Switzerland. |
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Laboratoire Écologie Fonctionnelle et Environnement, 118 Route de Narbonne, Toulouse, France |
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Export Date: 8 February 2016 |
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EcoFoG @ webmaster @ |
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656 |
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Verheyen, K.; Vanhellemont, M.; Auge, H.; Baeten, L.; Baraloto, C.; Barsoum, N.; Bilodeau-Gauthier, S.; Bruelheide, H.; Castagneyrol, B.; Godbold, D.; Haase, J.; Hector, A.; Jactel, H.; Koricheva, J.; Loreau, M.; Mereu, S.; Messier, C.; Muys, B.; Nolet, P.; Paquette, A.; Parker, J.; Perring, M.; Ponette, Q.; Potvin, C.; Reich, P.; Smith, A.; Weih, M.; Scherer-Lorenzen, M. |
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Contributions of a global network of tree diversity experiments to sustainable forest plantations |
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2016 |
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Ambio |
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Ambio |
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45 |
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29-41 |
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Biodiversity experiments; Ecological restoration; Functional biodiversity research; Plantation forest; Sustainable forest management |
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The area of forest plantations is increasing worldwide helping to meet timber demand and protect natural forests. However, with global change, monospecific plantations are increasingly vulnerable to abiotic and biotic disturbances. As an adaption measure we need to move to plantations that are more diverse in genotypes, species, and structure, with a design underpinned by science. TreeDivNet, a global network of tree diversity experiments, responds to this need by assessing the advantages and disadvantages of mixed species plantations. The network currently consists of 18 experiments, distributed over 36 sites and five ecoregions. With plantations 1–15 years old, TreeDivNet can already provide relevant data for forest policy and management. In this paper, we highlight some early results on the carbon sequestration and pest resistance potential of more diverse plantations. Finally, suggestions are made for new, innovative experiments in understudied regions to complement the existing network. © 2015, Royal Swedish Academy of Sciences. |
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Department of Crop Production Ecology, Swedish University of Agricultural Sciences, PO Box 7043, Uppsala, Sweden |
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Export Date: 29 January 2016 |
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EcoFoG @ webmaster @ |
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652 |
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