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Ezanno, P.; Aubry-Kientz, M.; Arnoux, S.; Cailly, P.; L'Ambert, G.; Toty, C.; Balenghien, T.; Tran, A. |
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A generic weather-driven model to predict mosquito population dynamics applied to species of Anopheles, Culex and Aedes genera of southern France |
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Journal Article |
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Year |
2015 |
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Preventive Veterinary Medicine |
Abbreviated Journal |
Preventive Veterinary Medicine |
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120 |
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1 |
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39-50 |
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Mathematical modelling; Mosquito; Population dynamics; Seasonality; Sensitivity analysis; Surveillance |
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An accurate understanding and prediction of mosquito population dynamics are needed to identify areas where there is a high risk of mosquito-borne disease spread and persistence. Simulation tools are relevant for supporting decision-makers in the surveillance of vector populations, as models of vector population dynamics provide predictions of the greatest risk periods for vector abundance, which can be particularly helpful in areas with a highly variable environment. We present a generic weather-driven model of mosquito population dynamics, which was applied to one species of each of the genera Anopheles, Culex, and Aedes, located in the same area and thus affected by similar weather conditions. The predicted population dynamics of Anopheles hyrcanus, Culex pipiens, and Aedes caspius were not similar. An. hyrcanus was abundant in late summer. Cx. pipiens was less abundant but throughout the summer. The abundance of both species showed a single large peak with few variations between years. The population dynamics of Ae. caspius showed large intra- and inter-annual variations due to pulsed egg hatching. Predictions of the model were compared to longitudinal data on host-seeking adult females. Data were previously obtained using CDC-light traps baited with carbon dioxide dry ice in 2005 at two sites (. Marais du Viguerat and Tour Carbonnière) in a favourable temperate wetland of southern France (Camargue). The observed and predicted periods of maximal abundance for An. hyrcanus and Cx. pipiens tallied very well. Pearson's coefficients for these two species were over 75% for both species. The model also reproduced the major trends in the intra-annual fluctuations of Ae. caspius population dynamics, with peaks occurring in early summer and following the autumn rainfall events. Few individuals of this species were trapped so the comparison of predicted and observed dynamics was not relevant. A global sensitivity analysis of the species-specific models enabled us to identify the parameters most influencing the maximal abundance of mosquitoes. These key parameters were almost similar between species, but not with the same contributions. The emergence of adult mosquitoes was identified as a key process in the population dynamics of all of the three species considered here. Parameters associated with adult emergence therefore need to be precisely known to achieve accurate predictions. Our model is a flexible and efficient tool that predicts mosquito abundance based on local environmental factors. It is useful to and already used by a mosquito surveillance manager in France. © 2015 Elsevier B.V. |
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Université des Antilles et de la Guyane, UMR 'Ecologie des Forêts de Guyane'Kourou, France |
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Cited By :1; Export Date: 18 May 2015 |
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EcoFoG @ webmaster @ |
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603 |
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Esquivel-Muelbert, A.; Baker, T.R.; Dexter, K.G.; Lewis, S.L.; Brienen, R.J.W.; Feldpausch, T.R.; Lloyd, J.; Monteagudo-Mendoza, A.; Arroyo, L.; Álvarez-Dávila, E.; Higuchi, N.; Marimon, B.S.; Marimon-Junior, B.H.; Silveira, M.; Vilanova, E.; Gloor, E.; Malhi, Y.; Chave, J.; Barlow, J.; Bonal, D.; Davila Cardozo, N.; Erwin, T.; Fauset, S.; Hérault, B.; Laurance, S.; Poorter, L.; Qie, L.; Stahl, C.; Sullivan, M.J.P.; ter Steege, H.; Vos, V.A.; Zuidema, P.A.; Almeida, E.; Almeida de Oliveira, E.; Andrade, A.; Vieira, S.A.; Aragão, L.; Araujo-Murakami, A.; Arets, E.; Aymard C, G.A.; Baraloto, C.; Camargo, P.B.; Barroso, J.G.; Bongers, F.; Boot, R.; Camargo, J.L.; Castro, W.; Chama Moscoso, V.; Comiskey, J.; Cornejo Valverde, F.; Lola da Costa, A.C.; del Aguila Pasquel, J.; Di Fiore, A.; Fernanda Duque, L.; Elias, F.; Engel, J.; Flores Llampazo, G.; Galbraith, D.; Herrera Fernández, R.; Honorio Coronado, E.; Hubau, W.; Jimenez-Rojas, E.; Lima, A.J.N.; Umetsu, R.K.; Laurance, W.; Lopez-Gonzalez, G.; Lovejoy, T.; Aurelio Melo Cruz, O.; Morandi, P.S.; Neill, D.; Núñez Vargas, P.; Pallqui Camacho, N.C.; Parada Gutierrez, A.; Pardo, G.; Peacock, J.; Peña-Claros, M.; Peñuela-Mora, M.C.; Petronelli, P.; Pickavance, G.C.; Pitman, N.; Prieto, A.; Quesada, C.; Ramírez-Angulo, H.; Réjou-Méchain, M.; Restrepo Correa, Z.; Roopsind, A.; Rudas, A.; Salomão, R.; Silva, N.; Silva Espejo, J.; Singh, J.; Stropp, J.; Terborgh, J.; Thomas, R.; Toledo, M.; Torres-Lezama, A.; Valenzuela Gamarra, L.; van de Meer, P.J.; van der Heijden, G.; van der Hout, P.; Vasquez Martinez, R.; Vela, C.; Vieira, I.C.G.; Phillips, O.L. |
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Title |
Compositional response of Amazon forests to climate change |
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Journal Article |
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Year |
2019 |
Publication |
Global Change Biology |
Abbreviated Journal |
Global Change Biol. |
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Volume |
25 |
Issue |
1 |
Pages |
39-56 |
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bioclimatic niches; climate change; compositional shifts; functional traits; temporal trends; tropical forests; bioclimatology; climate change; floristics; lowland environment; niche; temporal variation; tropical forest; Amazonia; carbon dioxide; water; biodiversity; Brazil; classification; climate change; ecosystem; forest; physiology; season; tree; tropic climate; Biodiversity; Brazil; Carbon Dioxide; Climate Change; Ecosystem; Forests; Seasons; Trees; Tropical Climate; Water |
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Most of the planet's diversity is concentrated in the tropics, which includes many regions undergoing rapid climate change. Yet, while climate-induced biodiversity changes are widely documented elsewhere, few studies have addressed this issue for lowland tropical ecosystems. Here we investigate whether the floristic and functional composition of intact lowland Amazonian forests have been changing by evaluating records from 106 long-term inventory plots spanning 30 years. We analyse three traits that have been hypothesized to respond to different environmental drivers (increase in moisture stress and atmospheric CO 2 concentrations): maximum tree size, biogeographic water-deficit affiliation and wood density. Tree communities have become increasingly dominated by large-statured taxa, but to date there has been no detectable change in mean wood density or water deficit affiliation at the community level, despite most forest plots having experienced an intensification of the dry season. However, among newly recruited trees, dry-affiliated genera have become more abundant, while the mortality of wet-affiliated genera has increased in those plots where the dry season has intensified most. Thus, a slow shift to a more dry-affiliated Amazonia is underway, with changes in compositional dynamics (recruits and mortality) consistent with climate-change drivers, but yet to significantly impact whole-community composition. The Amazon observational record suggests that the increase in atmospheric CO 2 is driving a shift within tree communities to large-statured species and that climate changes to date will impact forest composition, but long generation times of tropical trees mean that biodiversity change is lagging behind climate change. |
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Museu Paraense Emílio Goeldi, Pará, Brazil |
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Blackwell Publishing Ltd |
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13541013 (Issn) |
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Cited By :21; Export Date: 6 January 2020; Correspondence Address: Esquivel-Muelbert, A.; School of Geography, University of LeedsUnited Kingdom; email: adriane.esquivel@gmail.com |
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EcoFoG @ webmaster @ |
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905 |
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Bertani, S.; Houel, E.; Bourdy, G.; Stien, D.; Jullian, V.; Landau, I.; Deharo, E. |
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Quassia amara L. (Simaroubaceae) leaf tea: Effect of the growing stage and desiccation status on the antimalarial activity of a traditional preparation |
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Journal Article |
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Year |
2007 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
J. Ethnopharmacol. |
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111 |
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1 |
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40-42 |
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antimalarial; Quassia amara; quassinoids; simalikalactone D; traditional medicine |
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In French Guiana, Quassia amara L. (Simaroubaceae) leaf tea is a well-known widely used traditional antimalarial remedy. Impact of the vegetal sampling condition on in vivo and in vitro antimalarial activity was assessed. Traditional infusions were prepared with juvenile or mature leaves, both either fresh or dried. Results showed that growing stage and freshness of vegetal material exert a striking effect on antimalarial activity, both in vitro and in vivo. By far, leaf tea made from fresh juvenile (FJ) Quassia amara leaves was the most active. In vitro, active component (simalikalactone D) concentration correlates biological activities, although unexplained subtle variations were observed. In vivo, tea made with dried juvenile (DJ) leaves displays a peculiar behavior, meaning that some components may help simalikalactone D delivery or may be active in vivo only, therefore enhancing the expected curative effect of the traditional preparation. (c) 2006 Elsevier Ireland Ltd. All rights reserved. |
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Univ Toulouse 3, Ctr IRD, UMR 152, IRD, F-97323 Cayenne Cx, Guyana, Email: eric.deharo@ird.fr |
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ELSEVIER IRELAND LTD |
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0378-8741 |
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ISI:000246059600007 |
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EcoFoG @ eric.marcon @ |
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164 |
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Barabe, D.; Lacroix, C.; Gibernau, M. |
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Title |
Floral development of Urospatha: merosity and phylogeny in the Lasioideae (Araceae) |
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Journal Article |
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2011 |
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Plant Systematics and Evolution |
Abbreviated Journal |
Plant Syst. Evol. |
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296 |
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1-2 |
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41-50 |
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Inflorescence; Homeosis; Angiosperms; Systematic; Morphogenetic constraints |
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In this paper we study merosity in the genus Urospatha within the framework of a resolved phylogeny of the Araceae. We analyse how a transition from dimerous or tetramerous merosity to pentamerous or hexamerous merosity can occur developmentally in the Lasioideae. In Urospatha, initiation of floral primordia along the inflorescence is acropetal, while development of flowers is basipetal. This indicates the presence of two distinct phases in the development of the Urospatha inflorescence. The first phase corresponds to initiation of flowers and establishment of the phyllotactic pattern, and the second phase to differentiation of floral organs. Urospatha is characterized by the presence of trimerous, tetramerous, pentamerous and rarely hexamerous flowers. In all types of flowers, the stamens are closely associated and opposite to the tepals. Pentamerous flowers are formed by addition of a sector comprising a stamen and tepal. Likewise, in the case of hexamerous flowers, two sectors are added. In the Lasioideae, the increase in the number of tepals and stamens is linked with two developmental processes that have appeared independently in the subfamily: (1) addition of one or two stamen-petal sectors (Anaphyllopsis and Urospatha), and (2) independent increase in the number of tepals and stamens on whorls, more or less organized and inserted in alternate position (Dracontium). Tetramerous whorls as they occur in basal Lasioideae would be homologous to two dimerous whorls from an evolutionary point of view. |
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[Barabe, D; Gibernau, M] CNRS UMR Ecol Forets Guyane 8172, F-97387 Kourou, France, Email: denis.barabe@umontreal.ca |
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Springer Wien |
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0378-2697 |
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WOS:000294201300004 |
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EcoFoG @ webmaster @ |
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338 |
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Sist, P.; Blanc, L.; Mazzei, L.; Baraloto, C.; Aussenac, R. |
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Current knowledge on overall post-logging biomass dynamics in Northern Amazonian forests |
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Journal Article |
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2012 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois Forets Tropiques |
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66 |
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314 |
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41-49 |
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Above ground-biomass; Amazonian rainforests; Logging impact; Silviculture |
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This article presents the effects of logging on the dynamics of above-ground biomass from the results of the post-logging study within two forests: Cikel in Eastern Pará, Brazil and Paracou in French Guiana. The main objective is to compare the impact of commercial logging on the regeneration of the aboveground biomass in these forests whose characteristics differ in terms of structure and growth. In both sites, the intensity of exploitation is a key factor in determining the loss of biomass and the time required for its regeneration. In Paracou, the regeneration of biomass lost during conventional logging of 10 trees per hectare takes 45 years and more than 100 years when operating with higher intensity (21 trees/ha ). In Cikel the forest biomass regenerates after 49 years harvesting 6 trees/ha and that takes 87 years after removal of 8 trees/ha. This regeneration needs similar time on both sites but with lower logging intensity at Cikel, in which felled trees are larger with a greater biomass than those of Paracou. This post-logging study has established a direct correlation of the dynamics of the biomass with the initial structure of the forest, as well as with the parameters of forest dynamics: mortality, growth and recruitment. The accumulation of biomass by the tree growth of the two remaining stands is a key parameter for the net carbon storage, while the contribution of recruitment in Paracou becomes significant only after 10 years after felling. Therefore in view to improve the growth of residual trees, it is compulsory to apply adequate silvicultural treatments such as selective thinning or removal of vines. While the two forests are geographically close enough, their regenerative abilities differ and because of the significant difference in size of the trees, the forest could tolerate more intensive harvesting in French Guiana. |
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Université Antilles-Guyane Cayenne, Guyane, France |
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0006579x (Issn) |
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Export Date: 5 June 2013; Source: Scopus; Language of Original Document: English; Correspondence Address: Cirad UR B and SEF, Campus international de Baillarguet, 34398 Montpellier Cedex 5, France |
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EcoFoG @ webmaster @ |
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489 |
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Schmidt, M.; Dejean, A. |
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A dolichoderine ant that constructs traps to ambush prey collectively: convergent evolution with a myrmicine genus |
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Journal Article |
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2018 |
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Biological Journal of the Linnean Society |
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124 |
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1 |
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41-46 |
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Azteca brevis Forel, a dolichoderine ant species, builds along the branches of its host plant galleries that bear numerous holes slightly wider than a worker’s head. We noted that the workers hide, mandibles open, beneath different holes, waiting for arthropod prey to walk by or alight. They seize the extremities of these arthropods and pull backwards, immobilizing the prey, which is then spreadeagled and later carved up or pulled into a gallery before being carved up. The total duration of the capture ranges from a few minutes to several hours. This ambush group hunting permits the capture of insects of a wide range of sizes, with the largest being 48.71 times heavier than the workers, something that we compared with other cases of group hunting by ants and trap use by other arthropods. A convergence with myrmicine ants of the genus Allomerus is shown. Thus, this study also shows that the genus Azteca presents the largest panel of group hunting strategies by ants and that there is polyethism related to polymorphism, as hunting workers are larger than their nestmates. We concluded that these gallery-shaped traps correspond to the notion of ‘extended phenotype’. |
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0024-4066 |
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10.1093/biolinnean/bly028 |
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EcoFoG @ webmaster @ |
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822 |
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Vincent, G.; Weissenbacher, E.; Sabatier, D.; Blanc, L.; Proisy, C.; Couteron, P. |
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Detection des variations de structure de peuplements en foret dense tropicale humide par lidar aeroporte |
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Journal Article |
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2010 |
Publication |
Revue Francaise de Photogrammetrie et de Teledetection |
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Rev. Fr. Photogramm. Teledetect. |
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191 |
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42-51 |
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Above-ground biomass estimation; Canopy height model; Stem diameter distribution; Tropical moist forest; Above ground biomass; Above ground level; Airborne LiDAR; Basal area; Canopy Height Models; Carbon stocks; Characterisation; Classical fields; Coefficient of variation; Diameter distributions; Digital terrain model; Flooded areas; Forest ecology; Forest structure; Forest type; High spatial resolution; Individual tree; LIDAR data; Light detection and ranging; Local statistics; Long term; Management issues; Natural forests; Natural variation; Pearson correlation coefficients; Quadratic mean diameter; Soil characteristics; Soil cover; Spatial changes; Spatial resolution; Stem density; Stem diameter; Stem height; Strong correlation; Tree height; Tropical moist forest; Tropical rain forest; Vegetation structure; Vertical accuracy; Water regime; Discriminant analysis; Ecology; Optical radar; Remote sensing; Soils; Statistics; Stem cells; Temperature control; Tropics; Vegetation; Forestry; Biomass; Discriminant Analysis; Ecology; Forest Canopy; Forestry; Radar; Remote Sensing; Stems; Temperature Control; Tropical Atmospheres |
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Characterisation of forest structure is a major stake for forestry, species conservation, carbon stock estimates and many forest ecology and management issues. At large scale natural forest structure tends to vary according to climate and geomorphomology (Paget, 1999; Steege et al., 2006) while soil characteristics (and notably water regime) and syMgenetic stage add some finer scale variation (Oldeman, 1989; Sabatier et al., 1997). Forest structure characterisation traditionally relies on field-based collection of individual tree dimensions such as stem diameter and stem height sampled across tracks of forest (Hall et al., 1998). However, such field intensive methods are costly, and of low accuracy regarding measures of tree heights. Airborne light detection and ranging (LiDAR) technology provides horizontal and vertical Information at high spatial resolutions and vertical accuracies (Lim et al., 2003; Hyyppä et al., 2004). It has the potential for gathering vegetation structure data over large areas rapidly at moderate cost and hence is of particular relevance for poorly sampled, difficult to access and largely unexplored tropical rainforests. In this study we examined the ability of airborne LiDAR to detect spatial changes in the structure of dense tropical rain forest and we probed this remote sensing approach against local statistics derived from stem diameters (i.e. classical field data information) mapped across a large track of forest at a long term experimental site in French Guyana. The large variability in forest structure occurring at the experimental site is du to natural variation of the soil cover (and notably drainage properties) combined with various logging intensities applied 15 years before the LiDAR data were acquired. On this basis ten different forest types were identified at the site (figure 1 and 3). Various stem based statistics were computed for a series of meshes with cells ranging from 30 by 30 m plots to 250 by 250 m plots. These statistics included basal area, stem density, quadratic mean diameter, and diameter distribution percentiles. Similarly local statistics were extracted either from the Canopy Height Model (e.g. median height, mean height, standard height deviation, height coefficient of variation, height percentiles, frequency of hits below 5 m above ground level). Additionally a wetness index (Böhner et al., 2002) was computed at each node of a 5 by 5 m grid from the Digital Terrain Model also extracted from the LiDAR data set. We used both types of cell statistics to discriminate the various forest types. Comparison between the two approaches for a range of spatial resolution is available from in table 1. Results indicate that LiDAR based statistics are essentially as powerful as field based statistics to discriminate forest types at coarse scale. This reflects the very strong correlation between the CHM and the field based stem diameter data. For example (figure 5) the Pearson correlation coefficient between median height and quadratic mean diameter for cells of 125 by 125 m is 0.945 (n=0.72). When a finer resolution is required however as for the detection of seasonally flooded bottomland forest along thalwegs, then LiDAR technology proves more efficient than field based inventories as it combines information from the DTM and the CHM. The wetness index alone correctly retrieves about 2 thirds of the seasonally flooded areas. All in all, discriminant analysis performance of the LiDAR derived information approaches 80% when classifying forests cover at the finest scale of 5 by 5m into 10 different types and reaches 87% when a coarser classification Into 6 forest types is considered (figure 4). |
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IRD, UMR AMAP, Montpellier, France |
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17689791 (Issn) |
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Cited By (since 1996): 1; Export Date: 21 October 2011; Source: Scopus; Language of Original Document: French; Correspondence Address: Vincent, G.; IRD, UMR AMAP, Kourou – BP 701 (CIRAD) 97387 Kourou cedex -Guyane, France |
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EcoFoG @ webmaster @ |
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351 |
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Chave, J.; Navarrete, D.; Almeida, S.; Alvarez, E.; Aragao, L.E.O.C.; Bonal, D.; Chatelet, P.; Silva-Espejo, J.E.; Goret, J.Y.; von Hildebrand, P.; Jimenez, E.; Patino, S.; Penuela, M.C.; Phillips, O.L.; Stevenson, P.; Malhi, Y. |
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Title |
Regional and seasonal patterns of litterfall in tropical South America |
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Journal Article |
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2010 |
Publication |
Biogeosciences |
Abbreviated Journal |
Biogeosciences |
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7 |
Issue |
1 |
Pages |
43-55 |
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The production of aboveground soft tissue represents an important share of total net primary production in tropical rain forests. Here we draw from a large number of published and unpublished datasets (n=81 sites) to assess the determinants of litterfall variation across South American tropical forests. We show that across old-growth tropical rainforests, litterfall averages 8.61 +/- 1.91 Mg ha(-1) yr(-1) (mean +/- standard deviation, in dry mass units). Secondary forests have a lower annual litterfall than old-growth tropical forests with a mean of 8.01 +/- 3.41 Mg ha(-1) yr(-1). Annual litterfall shows no significant variation with total annual rainfall, either globally or within forest types. It does not vary consistently with soil type, except in the poorest soils (white sand soils), where litterfall is significantly lower than in other soil types (5.42 +/- 1.91 Mg ha(-1) yr(-1)). We also study the determinants of litterfall seasonality, and find that it does not depend on annual rainfall or on soil type. However, litterfall seasonality is significantly positively correlated with rainfall seasonality. Finally, we assess how much carbon is stored in reproductive organs relative to photosynthetic organs. Mean leaf fall is 5.74 +/- 1.83 Mg ha(-1) yr(-1) (71% of total litterfall). Mean allocation into reproductive organs is 0.69 +/- 0.40 Mg ha(-1) yr(-1) (9% of total litterfall). The investment into reproductive organs divided by leaf litterfall increases with soil fertility, suggesting that on poor soils, the allocation to photosynthetic organs is prioritized over that to reproduction. Finally, we discuss the ecological and biogeochemical implications of these results. |
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[Chave, J.] CNRS UPS, Lab Evolut & Divers Biol, UMR 5174, Toulouse, France, Email: chave@cict.fr |
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COPERNICUS GESELLSCHAFT MBH |
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ISI:000274058100004 |
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EcoFoG @ eric.marcon @ |
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70 |
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Lamarre, G.P.A.; Molto, Q.; Fine, P.V.A.; Baraloto, C. |
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A comparison of two common flight interception traps to survey tropical arthropods |
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2012 |
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ZooKeys |
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ZooKeys |
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216 |
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43-55 |
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Flight interception trap; French Guiana; Malaise trap; Performance; Sampling strategies; Tropical forest; Windowpane trap |
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Tropical forests are predicted to harbor most of the insect diversity on earth, but few studies have been conducted to characterize insect communities in tropical forests. One major limitation is the lack of consensus on methods for insect collection. Deciding which insect trap to use is an important consideration for ecologists and entomologists, yet to date few study has presented a quantitative comparison of the results generated by standardized methods in tropical insect communities. Here, we investigate the relative performance of two flight interception traps, the windowpane trap, and the more widely used malaise trap, across a broad gradient of lowland forest types in French Guiana. The windowpane trap consistently collected significantly more Coleoptera and Blattaria than the malaise trap, which proved most effective for Diptera, Hymenoptera, and Hemiptera. Orthoptera and Lepidoptera were not well represented using either trap, suggesting the need for additional methods such as bait traps and light traps. Our results of contrasting trap performance among insect orders underscore the need for complementary trapping strategies using multiple methods for community surveys in tropical forests. |
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Department of Biology, University of Florida, Gainesville, FL 32611, United States |
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Export Date: 4 October 2012; Source: Scopus; doi: 10.3897/zookeys.216.3332; Language of Original Document: English; Correspondence Address: Lamarre, G. P. A.; UniversitéAntilles-Guyane, UMR Ecologie des Forèts de Guyane, Campus agronomique de Kourou. Avenue de France, 97310 Kourou, French Guiana; email: Greg.Lamarre@ecofog.gf |
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438 |
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Groc, S.; Delabie, J.H.C.; Fernández, F.; Leponce, M.; Orivel, J.; Silvestre, R.; Vasconcelos, H.L.; Dejean, A. |
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Leaf-litter ant communities in a pristine Guianese rainforest: stable functional structure versus high species turnover |
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2013 |
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Myrmecological News |
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Myrmecol. News |
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19 |
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43-51 |
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EcoFoG @ webmaster @ |
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523 |
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