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Author Lambs, L.; Bompy, F.; Imbert, D.; Corenblit, D.; Dulormne, M. pdf  url
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  Title Seawater and freshwater circulations through coastal forested wetlands on a Caribbean Island Type Journal Article
  Year 2015 Publication Water Abbreviated Journal Water  
  Volume 7 Issue 8 Pages 4108-4128  
  Keywords 18O/2H stable isotope; Hydrology; Mangrove; Salinity; Swamp forest; Water level  
  Abstract Structure and composition of coastal forested wetlands are mainly controlled by local topography and soil salinity. Hydrology plays a major role in relation with tides, seaward, and freshwater inputs, landward. We report here the results of a two-year study undertaken in a coastal plain of the Guadeloupe archipelago (FWI). As elsewhere in the Caribbean islands, the study area is characterized by a micro-tidal regime and a highly seasonal climate. This work aimed at understanding groundwater dynamics and origin (seawater/freshwater) both at ecosystems and stand levels. These hydrological processes were assessed through 18O/16O and 2H/1H isotopic analyses, and from monthly monitoring of water level and soil salinity at five study sites located in mangrove (3) and swamp forest (2). Our results highlight the importance of freshwater budget imbalance during low rainfall periods. Sustained and/or delayed dry seasons cause soil salinity to rise at the mangrove/swamp forest ecotone. As current models on climate change project decreasing rainfall amounts over the inner Caribbean region, one may expect for this area an inland progression of the mangrove forest to the expense of the nearby swamp forest. © 2015 by the authors.  
  Address Geolab, UMR 6042, CNRS-Université Blaise Pascal, 4 rue Ledru, Clermont-Ferrand Cedex, France  
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  Notes Export Date: 8 September 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 621  
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Author Baraloto, C.; Alverga, P.; Quispe, S.B.; Barnes, G.; Chura, N.B.; da Silva, I.B.; Castro, W.; da Souza, H.; de Souza Moll, I.E.; Del Alcazar Chilo, J.; Linares, H.D.; Quispe, J.G.; Kenji, D.; Marsik, M.; Medeiros, H.; Murphy, S.; Rockwell, C.; Selaya, G.; Shenkin, A.; Silveira, M.; Southworth, J.; Vasquez Colomo, G.H.; Perz, S. url  openurl
  Title Effects of road infrastructure on forest value across a tri-national Amazonian frontier Type Journal Article
  Year 2015 Publication Biological Conservation Abbreviated Journal Biological Conservation  
  Volume 191 Issue Pages 674-681  
  Keywords Açai; Biodiversity; Brazil nut; Carbon stocks; Connectivity; Infrastructure; Livelihood; Ntfp; Redd; Road impact; Rubber; Timber; Tropical rainforest  
  Abstract Road construction demonstrably accelerates deforestation rates in tropical forests, but its consequences for forest degradation remain less clear. We estimated a series of forest value metrics including components of biodiversity, carbon stocks, and timber and non-timber forest product resources, along the recently paved Inter-Oceanic Highway (IOH) integrating Brazil and Peru along the Bolivian border. We installed 69 vegetation plots in intact terra firme forests representative of local community holdings near and far from the IOH, and we characterized 15 components of forest value for each plot.We observed strong geographic gradients in forest value components across the region, with increases from west to east in aboveground biomass and in the abundance of timber and non-timber forest product trees and regeneration. Plots in communities in Pando, Bolivia, where the IOH remains in part unpaved, had the highest aboveground biomass, standing timber volumes and Brazil nut tree density. In contrast, communities in Madre de Dios, Peru, where settlements and unpaved portions of the IOH have existed for decades, and in Acre, Brazil, where paving of the IOH has been underway for more than a decade, were more degraded. Seven of the fifteen forest value components we measured increased with increasing distance from the IOH, although the magnitude of these effects was weak. Landscape scale remote sensing analyses showed much stronger effects of road proximity on deforestation. We suggest that remote sensing techniques including canopy spectral signatures might be calibrated to characterize multiple components of forest value, so that we can estimate landscape scale impacts of infrastructure developments on both deforestation and forest degradation in tropical regions. © 2015 Elsevier B.V.  
  Address International Center for Tropical Botany, Department of Earth and Environment, Florida International University, Miami, FL, United States  
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  Notes Export Date: 8 September 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 619  
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Author Rivalland, C.; Madhkour, S.; Salvin, P.; Robert, F. url  openurl
  Title Electrochemical and microbial monitoring of multi-generational electroactive biofilms formed from mangrove sediment Type Journal Article
  Year 2015 Publication Bioelectrochemistry Abbreviated Journal Bioelectrochemistry  
  Volume 106 Issue Pages 125-132  
  Keywords Dissimilarity; High-throughput sequencing; Mes; Microbial diversity; Syntrophism  
  Abstract Electroactive biofilms were formed from French Guiana mangrove sediments for the analysis of bacterial communities' composition. The electrochemical monitoring of three biofilm generations revealed that the bacterial selection occurring at the anode, supposedly leading microbial electrochemical systems (MESs) to be more efficient, was not the only parameter to be taken into account so as to get the best electrical performance (maximum current density). Indeed, first biofilm generations produced a stable current density reaching about 18A/m2 while second and third generations produced current densities of about 10A/m2. MES bacterial consortia were characterized thanks to molecular biology techniques: DGGE and MiSeq® sequencing (Illumina®). High-throughput sequencing data statistical analysis confirmed preliminary DGGE data analysis, showing strong similarities between electroactive biofilms of second and third generations, but also revealing both selection and stabilization of the biofilms. © 2015 Elsevier B.V.  
  Address Laboratoire des Matériaux et Molécules en Milieu Amazonien, UAG-UMR EcoFoG, 2091 route de Baduel, Campus TrouBiran, Cayenne, Guyane Française, France  
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  Notes Export Date: 11 September 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 622  
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Author Dezerald, O.; Céréghino, R.; Corbara, B.; Dejean, A.; Leroy, C. url  openurl
  Title Temperature: Diet Interactions Affect Survival through Foraging Behavior in a Bromeliad-Dwelling Predator Type Journal Article
  Year 2015 Publication Biotropica Abbreviated Journal Biotropica  
  Volume 47 Issue 5 Pages 569-578  
  Keywords Toxorhynchites haemorrhoidalis; Biocontrol agent; Development; French Guiana; Selective feeding behavior; Tank bromeliad  
  Abstract Temperature, food quantity and quality play important roles in insect growth and survival, influencing population dynamics as well as interactions with other community members. However, the interaction between temperature and diet and its ecological consequences have been poorly documented. Toxorhynchites are well-known biocontrol agents for container-inhabiting mosquito larvae. We found that Toxorhynchites haemorrhoidalis larvae (Diptera: Culicidae) inhabiting water-filled rosettes of tank bromeliads catch and eat prey of both aquatic (mosquito larvae) and terrestrial origin (ants), using distinct predatory methods. They carried out frontal attacks on ants, but ambushed mosquito larvae. In choice tests, T. haemorrhoidalis favored terrestrial prey. Temperature had a significant effect on predator development and survival through its interaction with diet, but did not alter the preference for ants. T. haemorrhoidalis larvae emerged quickly when fed only mosquito larvae, whereas all individuals died before pupation when fed only ants. We conclude that behavioral factors (i.e., attraction to ants that disturb the surface of the water) overtake physiological factors (i.e., the adverse outcome of elevated temperature and an ant-based diet) in determining a predator's response to temperature:diet interactions. Finally, because T. haemorrhoidalis larvae preferentially feed on terrestrial insects in tank bromeliads, mosquito larvae may indirectly benefit from predation release. © 2015 Association for Tropical Biology and Conservation Inc.  
  Address UMR AMAP (botAnique et Modelisation de l'Architecture des Plantes et des vegetations), IRD, Boulevard de la Lironde, TA A-51/PS2, Montpellier Cedex 5, France  
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  Notes Export Date: 17 September 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 624  
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Author Dejean, A.; Groc, S.; Herault, B.; Rodriguez-Pérez, H.; Touchard, A.; Céréghino, R.; Delabie, J.H.C.; Corbara, B. url  openurl
  Title Bat aggregation mediates the functional structure of ant assemblages Type Journal Article
  Year 2015 Publication Comptes Rendus – Biologies Abbreviated Journal Comptes Rendus – Biologies  
  Volume 338 Issue 10 Pages 688-695  
  Keywords Ant functional groups; Bat roosts; Biogeochemical hotspots; Bioindicators; Stable isotopes  
  Abstract In the Guianese rainforest, we examined the impact of the presence of guano in and around a bat roosting site (a cave). We used ant communities as an indicator to evaluate this impact because they occupy a central place in the functioning of tropical rainforest ecosystems and they play different roles in the food web as they can be herbivores, generalists, scavengers or predators. The ant species richness around the cave did not differ from a control sample situated 500m away. Yet, the comparison of functional groups resulted in significantly greater numbers of detritivorous fungus-growing and predatory ant colonies around the cave compared to the control, the contrary being true for nectar and honeydew feeders. The role of bats, through their guano, was shown using stable isotope analyses as we noted significantly greater δ15N values for the ant species captured in and around the cave compared to controls. © 2015 Académie des sciences.  
  Address Laboratoire Microorganismes, Génome et Environnement, Université Clermont-Auvergne, Université Blaise-Pascal, BP 10448, Clermont-Ferrand, France  
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  Notes Export Date: 2 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 625  
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Author Talaga, S.; Dezerald, O.; Carteron, A.; Petitclerc, F.; Leroy, C.; Céréghino, R.; Dejean, A. url  openurl
  Title Tank bromeliads as natural microcosms: A facultative association with ants influences the aquatic invertebrate community structure Type Journal Article
  Year 2015 Publication Comptes Rendus – Biologies Abbreviated Journal Comptes Rendus – Biologies  
  Volume 338 Issue 10 Pages 696-700  
  Keywords Aechmea; Ant-bromeliad associations; Aquatic communities; Odontomachus; Phytotelm  
  Abstract Many tank bromeliads have facultative relationships with ants as is the case in French Guiana between Aechmea aquilega (Salib.) Griseb. and the trap-jaw ant, Odontomachus haematodus Linnaeus. Using a redundancy analysis, we determined that the presence of O. haematodus colonies is accompanied by a greater quantity of fine particulate organic matter in the water likely due to their wastes. This increase in nutrient availability is significantly correlated with an increase in the abundance of some detritivorous taxa, suggesting a positive bottom-up influence on the aquatic macroinvertebrate communities living in the A. aquilega wells. On the other hand, the abundance of top predators is negatively affected by a lower number of available wells due to ant constructions for nesting, releasing a top-down pressure that could also favor lower trophic levels. © 2015 Académie des sciences.  
  Address CNRS, Ecolab (UMR-CNRS 5245), 118, route de Narbonne, Toulouse, France  
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  Notes Export Date: 2 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 627  
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Author Rutishauser, E.; Herault, B.; Baraloto, C.; Blanc, L.; Descroix, L.; Sotta, E.D.; Ferreira, J.; Kanashiro, M.; Mazzei, L.; D'Oliveira, M.V.N.; De Oliveira, L.C.; Peña-Claros, M.; Putz, F.E.; Ruschel, A.R.; Rodney, K.; Roopsind, A.; Shenkin, A.; Da Silva, K.E.; De Souza, C.R.; Toledo, M.; Vidal, E.; West, T.A.P.; Wortel, V.; Sist, P. url  openurl
  Title Rapid tree carbon stock recovery in managed Amazonian forests Type Journal Article
  Year 2015 Publication Current Biology Abbreviated Journal Current Biology  
  Volume 25 Issue 18 Pages R787-R788  
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  Abstract Summary While around 20% of the Amazonian forest has been cleared for pastures and agriculture, one fourth of the remaining forest is dedicated to wood production [1]. Most of these production forests have been or will be selectively harvested for commercial timber, but recent studies show that even soon after logging, harvested stands retain much of their tree-biomass carbon and biodiversity [2,3]. Comparing species richness of various animal taxa among logged and unlogged forests across the tropics, Burivalova et al.[4] found that despite some variability among taxa, biodiversity loss was generally explained by logging intensity (the number of trees extracted). Here, we use a network of 79 permanent sample plots (376 ha total) located at 10 sites across the Amazon Basin [5] to assess the main drivers of time-to-recovery of post-logging tree carbon (Table S1). Recovery time is of direct relevance to policies governing management practices (i.e., allowable volumes cut and cutting cycle lengths), and indirectly to forest-based climate change mitigation interventions. © 2015 Elsevier Ltd.  
  Address Biodiversity Department, CELOS, Paramaribo, Paramaribo, Suriname  
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  Notes Export Date: 2 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 626  
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Author Nirma, C.; Eparvier, V.; Stien, D. url  openurl
  Title Reactivation of antibiosis in the entomogenous fungus Chrysoporthe sp. SNB-CN74 Type Journal Article
  Year 2015 Publication Journal of Antibiotics Abbreviated Journal Journal of Antibiotics  
  Volume 68 Issue 9 Pages 586-590  
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  Abstract Chrysoporthe sp. SNB-CN74 was isolated from a Nasutitermes corniger nest, and its ethyl acetate extract was found to exhibit very strong antibacterial activity. Two antibacterial metabolites were isolated, (-)-R-skyrin (2) and (+)-rugulosin A (3). Eventually, the fungus lost its antibiotic potential when subcultured, and the use of yeast extract induced the re-expression of these two antibiotics. Yeast extract possibly activated a cryptic pathway by mimicking the presence of an ecological competitor. © 2015 Japan Antibiotics Research Association All rights reserved.  
  Address Sorbonne Universités, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls-sur-mer, France  
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  Notes Export Date: 12 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 628  
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Author Paine, C.E.T.; Baraloto, C.; Díaz, S. url  openurl
  Title Optimal strategies for sampling functional traits in species-rich forests Type Journal Article
  Year 2015 Publication Functional Ecology Abbreviated Journal Functional Ecology  
  Volume 29 Issue 10 Pages 1325-1331  
  Keywords French Guiana; Functional traits; Plant traits; Sampling design; Specific leaf area; Tropical forest; Wood density  
  Abstract Functional traits provide insight into a variety of ecological questions, yet the optimal sampling method to estimate the community-level distribution of plant functional trait values remains a subject of debate, especially in species-rich forests. We present a simulation analysis of the trait distribution of a set of nine completely sampled permanent plots in the lowland rain forests of French Guiana. Increased sampling intensity consistently improved accuracy in estimating community-weighted means and variances of functional trait values, whereas there was substantial variation among functional traits and minor differences among sampling strategies. Thus, investment in intensified sampling yields a greater improvement in the accuracy of estimation than does an equivalent investment in sampling design complication. Notably, 'taxon-free' strategies frequently had greater accuracy than did abundance-based strategies, which had the additional cost of requiring botanical surveys. We conclude that there is no substitute for extensive field sampling to accurately characterize the distribution of functional trait values in species-rich forests. © 2015 British Ecological Society.  
  Address Instituto Multidisciplinario de Biología Vegetal (IMBIV-CONICET), Departamento de Diversidad Biológica y Ecología, FCEFyN, Universidad Nacional de Córdoba, CC 495, Córdoba, Argentina  
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  Notes Export Date: 12 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 630  
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Author Maréchaux, I.; Bartlett, M.K.; Sack, L.; Baraloto, C.; Engel, J.; Joetzjer, E.; Chave, J. url  openurl
  Title Drought tolerance as predicted by leaf water potential at turgor loss point varies strongly across species within an Amazonian forest Type Journal Article
  Year 2015 Publication Functional Ecology Abbreviated Journal Functional Ecology  
  Volume 29 Issue 10 Pages 1268-1277  
  Keywords Climate change; French Guiana; Functional traits; Plant-water relations; Tropical trees; Wilting  
  Abstract Amazonian droughts are predicted to become increasingly frequent and intense, and the vulnerability of Amazonian trees has become increasingly documented. However, little is known about the physiological mechanisms and the diversity of drought tolerance of tropical trees due to the lack of quantitative measurements. Leaf water potential at wilting or turgor loss point (π<inf>tlp</inf>) is a determinant of the tolerance of leaves to drought stress and contributes to plant-level physiological drought tolerance. Recently, it has been demonstrated that leaf osmotic water potential at full hydration (π<inf>o</inf>) is tightly correlated with π<inf>tlp</inf>. Estimating π<inf>tlp</inf> from osmometer measurements of π<inf>o</inf> is much faster than the standard pressure-volume curve approach of π<inf>tlp</inf> determination. We used this technique to estimate π<inf>tlp</inf> for 165 trees of 71 species, at three sites within forests in French Guiana. Our data set represents a significant increase in available data for this trait for tropical tree species. Tropical trees showed a wider range of drought tolerance than previously found in the literature, π<inf>tlp</inf> ranging from -1·4 to -3·2 MPa. This range likely corresponds in part to adaptation and acclimation to occasionally extreme droughts during the dry season. Leaf-level drought tolerance varied across species, in agreement with the available published observations of species variation in drought-induced mortality. On average, species with a more negative π<inf>tlp</inf> (i.e. with greater leaf-level drought tolerance) occurred less frequently across the region than drought-sensitive species. Across individuals, π<inf>tlp</inf> correlated positively but weakly with leaf toughness (R2 = 0·22, P = 0·04) and leaf thickness (R2 = 0·03, P = 0·03). No correlation was detected with other functional traits (leaf mass per area, leaf area, nitrogen or carbon concentrations, carbon isotope ratio, sapwood density or bark thickness). The variability in π<inf>tlp</inf> among species indicates a potential for highly diverse species responses to drought within given forest communities. Given the weak correlations between π<inf>tlp</inf> and traditionally measured plant functional traits, vegetation models seeking to predict forest response to drought should integrate improved quantification of comparative drought tolerance among tree species. © 2015 British Ecological Society.  
  Address CNRM-GAME – URA1357, 42 avenue G. Coriolis, Toulouse, France  
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  Notes Cited By :1; Export Date: 12 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 629  
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