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Guerrero, R.J.; Delabie, J.H.C.; Dejean, A. |
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Title |
Taxonomic Contribution to the aurita Group of the Ant Genus Azteca (Formicidae: Dolichoderinae) |
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Journal Article |
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2010 |
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Journal of Hymenoptera Research |
Abbreviated Journal |
J. Hymenopt. Res. |
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19 |
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1 |
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51-65 |
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We describe five new species in the aurita group of the genus Azteca: Azteca andreae sp. n. (French Guiana), Azteca diabolica sp. n. (Panama), Azteca laurae sp. n. (Brazil), Azteca linamariae sp. n. (Brazil and Colombia) and Azteca snellingi sp. n. (Panama). Four of these new species are based on gynes, while the last is based only on the worker caste. All of them bear the aurita group characteristics. The second taxon is remarkable, as it differs from all of the other members of the group in the exaggerated, horn-like extensions of the posterolateral vertex margins. Azteca snellingi sp. n. is named in honor of our colleague, Roy Snelling, in tribute to his life-long contribution to knowledge of the world of Hymenoptera. A key to all known species of the aurita group, based on gynes, is provided. We report also for the first time an intercast case for the genus Azteca, based on an Azteca schimperi specimen. |
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[Guerrero, Roberto J.] Univ Magdalena, INTROPIC, Grp Invest Insectos Neotrop, Santa Marta, Magdalena, Colombia, Email: robertojoseguerreroflorez@gmail.com |
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INT SOC HYMENOPTERISTS |
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1070-9428 |
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ISI:000285775800005 |
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EcoFoG @ eric.marcon @ |
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279 |
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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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Title |
Low Phylogenetic Beta Diversity and Geographic Neo-endemism in 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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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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Guitet, S.; Blanc, L.; Trombe, P.J.; Lehallier, B. |
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Title |
Silvicultural Treatments in the Tropical Forests of Guiana: A Review of Ten Years of Trials |
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2009 |
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Bois et Forets des Tropiques |
Abbreviated Journal |
Bois For. Trop. |
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63 |
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301 |
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7-19 |
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cutting cycle; thinning; stand dynamics; logging; French Guiana |
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This article reviews an experimental system set up in French Guiana to test different selective thinning methods that started ten to fifteen years after logging in order to reconstitute commercially viable stands within the shortest time. The thinning methods tested involve a combination of selective intervention within a radius of 10 metres around crop trees and systematic intervention applied uniformly to the entire forest parcel. The resulting thinning intensity produces an 8% to 45% reduction in basal area. While the growth of the residual stand is strongly boosted in all species and for all diameters, there is little change in basal area because of high mortality and lower recruitment of commercial species. Standing commercial capital, however, is strongly affected by the thinning operations as defined. In effect, these thinning methods that benefit crop stems do not meet the objective of shorter rotations in Guiana's tropical logging forests. On the other hand, the measurements made in under-treatment stands agree with those obtained at the Paracou experimental station and confirm the need to adopt long cutting cycles of more than fifty years to ensure that the extraction of valuable species is sustainable in the current logging context in French Guiana. |
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[Guitet, Stephane; Trombe, Pierre-Julien; Lehallier, Benoit] Direct Reg Guyane, Off Natl Forets, F-97307 Cayenne, France |
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CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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0006-579X |
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ISI:000272488700002 |
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EcoFoG @ eric.marcon @ |
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91 |
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Guitet, S.; Herault, B.; Molto, Q.; Brunaux, O.; Couteron, P. |
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Spatial structure of above-ground biomass limits accuracy of carbon mapping in rainforest but large scale forest inventories can help to overcome |
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2015 |
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PLoS ONE |
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PLoS ONE |
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10 |
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9 |
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e0138456 |
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Precise mapping of above-ground biomass (AGB) is a major challenge for the success of REDD+ processes in tropical rainforest. The usual mapping methods are based on two hypotheses: a large and long-ranged spatial autocorrelation and a strong environment influence at the regional scale. However, there are no studies of the spatial structure of AGB at the landscapes scale to support these assumptions.We studied spatial variation in AGB at various scales using two large forest inventories conducted in French Guiana. The dataset comprised 2507 plots (0.4 to 0.5 ha) of undisturbed rainforest distributed over the whole region. After checking the uncertainties of estimates obtained from these data, we used half of the dataset to develop explicit predictive models including spatial and environmental effects and tested the accuracy of the resulting maps according to their resolution using the rest of the data. Forest inventories provided accurate AGB estimates at the plot scale, for a mean of 325 Mg.ha-1. They revealed high local variability combined with a weak autocorrelation up to distances of no more than10 km. Environmental variables accounted for a minor part of spatial variation. Accuracy of the best model including spatial effects was 90 Mg.ha-1 at plot scale but coarse graining up to 2-km resolution allowed mapping AGB with accuracy lower than 50 Mg.ha-1. Whatever the resolution, no agreement was found with available pan-tropical reference maps at all resolutions.We concluded that the combined weak autocorrelation and weak environmental effect limit AGB maps accuracy in rainforest, and that a trade-off has to be found between spatial resolution and effective accuracy until adequate “wall-to-wall” remote sensing signals provide reliable AGB predictions. Waiting for this, using large forest inventories with low sampling rate (<0.5%) may be an efficient way to increase the global coverage of AGB maps with acceptable accuracy at kilometric resolution. Copyright: © 2015 Guitet et al. |
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Institut de Recherche Pour le Développement (IRD), UMR Amap, Montpellier, France |
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Export Date: 25 November 2015 |
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EcoFoG @ webmaster @ |
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639 |
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Guitet, S.; Pélissier, R.; Brunaux, O.; Jaouen, G.; Sabatier, D. |
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Geomorphological landscape features explain floristic patterns in French Guiana rainforest |
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Journal Article |
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2015 |
Publication |
Biodiversity and Conservation |
Abbreviated Journal |
Biodiversity and Conservation |
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24 |
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5 |
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1215-1237 |
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Geodiversity; Geomorphology; Landscapes; Species distribution; Tree community |
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Geomorphic landscape features have been suggested as indicators of forest diversity. However, their explanatory power has not yet been explicitly tested at a regional scale in tropical rainforest. We used forest inventories conducted according to a stratified sampling design (3,132 plots in 111 transects at 33 sites) and holistic multi-scale geomorphological mapping derived from a Shuttle Radar Topography Mission digital elevation model to describe and explain spatial patterns in floristic composition across French Guiana (80,000 km2). We measured and identified 123,906 trees with DBH ≥20 cm and used constrained and unconstrained ordinations to analyze variations in the abundance of 221 taxa and 51 families. Variance partitioning and variograms were used to detect spatial patterns in species composition, compare the explanatory power of spatial and environmental factors, and select the variables that best explain forest composition. Strong floristic patterns corresponded to a major latitudinal gradient and significant sub-regional floristic structure. Geomorphological landscapes shaped by historic climate fluctuations and major geological events successfully captured these patterns and explained the variation in abundance of 80 taxa, corresponding to 65 % of the inventoried trees. Our findings suggest that long-term forest dynamics are under substantial “geomorphographic control”. A geomorphological perspective on landscapes that incorporates current and past environmental filters and historical biogeographical processes could thus be used more systematically in tropical regions for regional planning and forest conservation. © 2014, Springer Science+Business Media Dordrecht. |
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UMR EcoFoG, AgroParisTech, Campus agronomique, Guyane Française, BP 316, Kourou, France |
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Export Date: 8 September 2015 |
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EcoFoG @ webmaster @ |
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620 |
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Guitet, S.; Sabatier, D.; Brunaux, O.; Couteron, P.; Denis, T.; Freycon, V.; Gonzalez, S.; Hérault, B.; Jaouen, G.; Molino, J.-F.; Pélissier, R.; Richard-Hansen, C.; Vincent, G. |
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Title |
Disturbance Regimes Drive the Diversity of Regional Floristic Pools Across Guianan Rainforest Landscapes |
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Journal Article |
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2018 |
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Scientific Reports |
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Sci. Rep. |
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8 |
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3872 |
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Disturbances control rainforest dynamics, and, according to the intermediate disturbance hypothesis (IDH), disturbance regime is a key driver of local diversity. Variations in disturbance regimes and their consequences on regional diversity at broad spatiotemporal scales are still poorly understood. Using multidisciplinary large-scale inventories and LiDAR acquisitions, we developed a robust indicator of disturbance regimes based on the frequency of a few early successional and widely distributed pioneer species. We demonstrate at the landscape scale that tree-species diversity and disturbance regimes vary with climate and relief. Significant relationships between the disturbance indicator, tree-species diversity and soil phosphorus content agree with the hypothesis that rainforest diversity is controlled both by disturbance regimes and long-term ecosystem stability. These effects explain the broad-scale patterns of floristic diversity observed between landscapes. In fact, species-rich forests in highlands, which have benefited from long-term stability combined with a moderate and regular regime of local disturbances, contrast with less diversified forests on recently shaped lowlands, which have undergone more recent changes and irregular dynamics. These results suggest that taking the current disturbance regime into account and including geomorphological stratifications in climate-vegetation models may be an effective way to improve the prediction of changes in species diversity under climate change. © 2018 The Author(s). |
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AgroParisTech, EcoFoG, Kourou, French Guiana |
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Export Date: 21 March 2018 |
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EcoFoG @ webmaster @ |
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798 |
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Guitet, S.; Sabatier, D.; Brunaux, O.; Herault, B.; Aubry-Kientz, M.; Molino, J.-F.; Baraloto, C. |
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Estimating tropical tree diversity indices from forestry surveys: A method to integrate taxonomic uncertainty |
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Journal Article |
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Year |
2014 |
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Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
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328 |
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270-281 |
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Diversity; French guiana; Landscape scale; Monte-Carlo process; Rainforest; Tree community; Reliability; Surveys; Timber; Uncertainty analysis; Diversity; French Guiana; Landscape scale; Rainforest; Tree community; Forestry; estimation method; forest inventory; herbarium; landscape; numerical model; species diversity; taxonomy; uncertainty analysis; Forestry; Forests; Reliability; Surveys; French Guiana |
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Analyses of tree diversity and community composition in tropical rain forests are usually based either on general herbarium data or on a restricted number of botanical plots. Despite their high taxonomic accuracy, both types of data are difficult to extrapolate to landscape scales. Meanwhile, forestry surveys provide quantitative occurrence data on large areas, and are thus increasingly used for landscape-scale analyses of tree diversity. However, the reliability of these approaches has been challenged because of the ambiguity of the common (vernacular) names used by foresters and the complexity of tree taxonomy in those hyper-diverse communities.We developed and tested a novel approach to evaluate taxonomic reliability of forestry surveys and to propagate the resulting uncertainty in the estimates of several diversity indicators (alpha and beta entropy, Fisher-alpha and Sørensen similarity). Our approach is based on Monte-Carlo processes that simulate communities by taking into account the expected accuracy and reliability of common names. We tested this method in French Guiana, on 9 one-hectare plots (4279 trees – DBH. ≥. 10. cm) for which both common names and standardized taxonomic determinations were available. We then applied our method of community simulation on large forestry inventories (560. ha) at the landscape scale and compared the diversity indices obtained for 10 sites with those computed from precise botanical determination situated at the same localities.We found that taxonomic reliability of forestry inventories varied from 22% (species level) to 83% (family level) in this Amazonian region. Indices computed directly with raw forestry data resulted in incorrect values, except for Gini-Simpson beta-diversity. On the contrary, our correction method provides more accurate diversity estimates, highly correlated with botanical measurements, for almost all diversity indices at both regional and local scales. We obtained a robust ranking of sites consistent with those shown by botanical inventories.These results show that (i) forestry inventories represent a significant part of taxonomic information, (ii) the relative diversity of regional sites can be successfully ranked using forestry inventory data using our method and (iii) forestry inventories can valuably contribute to the detection of large-scale diversity patterns when biases are well-controlled and corrected.The tools we developed as R-functions are available in supplementary material and can be adapted with local parameters to be used for forest management and conservation issues in other regional contexts. © 2014 Elsevier B.V. |
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INRA, UMR EcoFoG, 97387 Kourou Cedex, French Guiana |
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Elsevier |
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03781127 (Issn) |
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Export Date: 30 July 2014; Coden: Fecmd; Correspondence Address: Guitet, S.; INRA, UMR Amap, TA A51/PS2, 34398 Montpellier Cedex 5, France; email: stephane.guitet@cirad.fr |
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EcoFoG @ webmaster @ |
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552 |
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Guzman, Laura Melissa ; Trzcinski, M. Kurtis ; Barberis, Ignacio M. ; Cereghino, Régis ; Srivastava, Diane S. ; Gilbert Benjamin ; Pillar, Valerio D. ; de Omena, Paula M. ; MacDonald, A. Andrew M. ; Corbara, Bruno ; Leroy, Celine ; Bautista, Fabiola Ospina ; Romero, Gustavo Q. ; Kratina, Pavel ; Debastiani, Vanderlei J. ; Gonialves, Ana Z. ; Marino, Nicholas A.C. ; Farjalla, Vinicius F. ; Richardson, Barbara A. ; Richardson, Michael J. ; Dézerald, Olivier ; Piccoli, Gustavo, C. O. ; Jocqué, Merlijn ; Montero, Guillermo |
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Title |
Climate influences the response of community functional traits to local conditions in bromeliad invertebrate communities |
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2021 |
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Ecography |
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44 |
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3 |
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440-452 |
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Functional traits determine an organism's performance in a given environment and as such determine which organisms will be found where. Species respond to local conditions, but also to larger scale gradients, such as climate. Trait ecology links these responses of species to community composition and species distributions. Yet, we often do not know which environmental gradients are most important in determining community trait composition at either local or biogeographical scales, or their interaction. Here we quantify the relative contribution of local and climatic conditions to the structure and composition of functional traits found within bromeliad invertebrate communities. We conclude that climate explains more variation in invertebrate trait composition within bromeliads than does local conditions. Importantly, climate mediated the response of traits to local conditions; for example, invertebrates with benthic life-history traits increased with bromeliad water volume only under certain precipitation regimes. Our ability to detect this and other patterns hinged on the compilation of multiple fine-grained datasets, allowing us to contrast the effect of climate versus local conditions. We suggest that, in addition to sampling communities at local scales, we need to aggregate studies that span large ranges in climate variation in order to fully understand trait filtering at local, regional and global scales. |
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Nordic Society OIKOS |
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EcoFoG @ webmaster @ |
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1013 |
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Haettenschwiler, S.; Coq, S.; Barantal, S.; Handa, I.T. |
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Leaf traits and decomposition in tropical rainforests: revisiting some commonly held views and towards a new hypothesis |
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2011 |
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New Phytologist |
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New Phytol. |
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189 |
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4 |
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950-965 |
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energy starvation; French Guiana; litter quality; mycorrhizas; nutrient cycling; nutrient limitation; phosphorus; soil fauna |
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Proper estimates of decomposition are essential for tropical forests, given their key role in the global carbon (C) cycle. However, the current paradigm for litter decomposition is insufficient to account for recent observations and may limit model predictions for highly diverse tropical ecosystems. In light of recent findings from a nutrient-poor Amazonian rainforest, we revisit the commonly held views that: litter traits are a mere legacy of live leaf traits; nitrogen (N) and lignin are the key litter traits controlling decomposition; and favourable climatic conditions result in rapid decomposition in tropical forests. Substantial interspecific variation in litter phosphorus (P) was found to be unrelated to variation in green leaves. Litter nutrients explained no variation in decomposition, which instead was controlled primarily by nonlignin litter C compounds at low concentrations with important soil fauna effects. Despite near-optimal climatic conditions, tropical litter decomposition proceeded more slowly than in a climatically less favourable temperate forest. We suggest that slow decomposition in the studied rainforest results from a syndrome of poor litter C quality beyond a simple lignin control, enforcing energy starvation of decomposers. We hypothesize that the litter trait syndrome in nutrient-poor tropical rainforests may have evolved to increase plant access to limiting nutrients via mycorrhizal associations. |
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[Haettenschwiler, Stephan; Coq, Sylvain; Barantal, Sandra; Handa, Ira Tanya] CNRS, CEFE, F-34293 Montpellier 5, France, Email: stephan.hattenschwiler@cefe.cnrs.fr |
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Wiley-Blackwell |
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0028-646x |
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ISI:000286940500009 |
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EcoFoG @ webmaster @ |
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296 |
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Hamadi, A.; Borderies, P.; Albinet, C.; Koleck, T.; Villard, L.; Ho Tong Minh, D.; Le Toan, T.; Burban, B. |
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Temporal coherence of tropical forests at P-band: Dry and rainy seasons |
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Journal Article |
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2015 |
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IEEE Geoscience and Remote Sensing Letters |
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IEEE Geosci. Remote Sens. Lett. |
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12 |
Issue |
3 |
Pages |
557-561 |
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Keywords |
Biomass mission; forest scattering; ground-based experiment; P-band; range impulse response; temporal coherence |
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Abstract |
In this letter, the temporal coherence of tropical forest scattering at P-band is addressed by means of a ground-based experiment. The study is based on the TropiScat campaign in French Guiana, designed to support the Biomass mission, which will be the ESA 7th Earth Explorer mission. For Biomass, temporal coherence is a crucial parameter for coherent processing of polarimetric synthetic aperture radar (SAR) interferometry and SAR tomography in repeat-pass acquisitions. During the experiment, data were continuously collected for six months during both the rainy and dry seasons. For the rain-free days in both seasons, the coherence exhibits a daily cycle showing a high decorrelation during daytime, which is likely due to motion in the canopy. Up to a 20-day baseline, the coherence is much higher in the dry season than in the rainy season (> 0.8). From 20 to 40 days, it presents the same order of magnitude in both seasons [0.6, 0.7]. For larger temporal baselines, it becomes lower in the dry season. The results can be used to assess the long-term coherence of repeat-pass observations over a tropical forest. However, an extension of this study to several years and over other forest spots would be necessary to draw more general conclusions. |
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EcoFogKourou, France |
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Institute of Electrical and Electronics Engineers Inc. |
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1545598x (Issn) |
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Notes |
Export Date: 21 October 2014; Correspondence Address: Hamadi, A.; Centre d'Etudes Spatiales de la BiosphèreFrance; Funding Details: ESA, European Space Agency |
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no |
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EcoFoG @ webmaster @ |
Serial |
563 |
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