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Dejean, Alain ; Petitclerc, Frédéric ; Azémar, Frédéric ; Rossi, Vivien |
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Title |
Nutrient provisioning of its host myrmecophytic tree by a temporary social parasite of a plant-ant |
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2021 |
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Biological Journal of the Linnean Society |
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133 |
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3 |
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744-750 |
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One of the most advanced ant–plant mutualisms is represented by myrmecophytes sheltering colonies of some plant-ant species in hollow structures called domatia. In turn, the myrmecophytes benefit from biotic protection and sometimes nutrient provisioning (myrmecotrophy). Furthermore, over the course of evolution, some ant species have become social parasites of others. In this general context, we studied the relationship between its host trees and Azteca andreae (Dolichoderinae), a temporary social parasite of the plant-ant Azteca ovaticeps, and, as such, obligatorily associated with myrmecophytic Cecropia obtusa trees (Urticaceae). A first experiment showed that the δ15N values of the young leaves of Cecropia sheltering a mature A. andreae colony were very similar to those for trees sheltering Azteca alfari or A. ovaticeps, two typical Cecropia mutualists for which myrmecotrophy is known. In a second experiment, by injecting a 15N-labelled glycine solution into locusts given as prey to A. andreae colonies, we triggered an increase in δ15N in the young leaves of their host Cecropia. Thus, 15N passed from the prey to the host trees, explaining the outcomes of the first experiment. We discuss these results in light of the notion of ‘by-product benefits’. |
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Oxford Academy |
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EcoFoG @ webmaster @ |
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1009 |
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Delabie, J.H.C.; Cereghino, R.; Groc, S.; Dejean, A.; Gibernau, M.; Corbara, B.; Dejean, A. |
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Title |
Ants as biological indicators of Wayana Amerindian land use in French Guiana |
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Journal Article |
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Year |
2009 |
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Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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332 |
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7 |
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673-684 |
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Landscape ecology; Traditional land use; Formicidae; Rapid assessment; Pit-fall traps; Self-Organizing Maps |
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We examined the ecological impact of traditional land use by Wayana Amerindians in French Guiana using ants as bio-indicators. Ants were sampled through a rapid assessment method and the core results analyzed using Kohonen's self-organizing maps (SOM). Our sample sites included: (1) a Wayana village; (2) a cassava plantation; (3) an abandoned cassava plantation; (4) a forest fragment near the village; (5) a riparian forest; and (6) a primary terra firma forest. The ant diversity decreases according to the decree to which the habitat is disturbed. The SOM allowed us to compare the ecological succession between the six habitats. The protocol used is robust since the same conclusions were drawn using partial data. To cite this article: J.H.C Delabie et al., C R. Biologies 332 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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[Groc, Sarah; Dejean, Andrea; Dejean, Alain] CNRS, UMR 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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1631-0691 |
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ISI:000267243700009 |
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EcoFoG @ eric.marcon @ |
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109 |
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Delabie, J.H.C.; Groc, S.; Dejean, A. |
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The tramp ant technomyrmex vitiensis (Hymenoptera: Formicidae: Dolichoderinae) on South America |
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2011 |
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Florida Entomologist |
Abbreviated Journal |
Fla. Entomol. |
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94 |
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3 |
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688-689 |
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Technomyrmex vitiensis is a tramp ant that has spread through many parts of the Old World tropics via human commerce. This species has been previously reported only once in the New World, from San Francisco, California. Here, we report the first records of T. vitiensis in South America, from two sites deep in the forest of French Guiana. It is not clear how these ants were transported to such remote sites, 100 km inland. Copyright © 2011 BioOne All rights reserved. |
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Université de Toulouse, UPS, 118 route de Narbonne, F-31062 Toulouse, France |
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00154040 (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Coden: Fetma; doi: 10.1653/024.094.0335; Language of Original Document: English; Correspondence Address: Delabie, J.H.C.; Universidade Estadual de Santa Cruz, Rodovia Ilhéus-Itabuna, Km 16, 45650-000 Ilhéus, Bahia, Brazil |
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EcoFoG @ webmaster @ |
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364 |
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Delaval, M.; Charles-Dominique, P. |
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Edge effects on frugivorous and nectarivorous bat communities in a neotropical primary forest in French Guiana |
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Journal Article |
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2006 |
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Revue d'Ecologie (La Terre et la Vie) |
Abbreviated Journal |
Rev. Ecol.-Terre Vie |
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61 |
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4 |
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343-352 |
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The impact of a road crossing a continuous Guyana primary forest was studied through the analysis of qualitative and quantitative changes in a frugivorous and nectarivorous bat community at different distances from forest edge. Bats were captured along three 3-km forest transects perpendicular to the edge, and at the Nouragues Station located 150 km in the interior of the primary forest block, in an uninhabited area. Along the 3-km transects, we caught over seven times more individuals than in primary forest, this value decreasing according to the distance from the edge. Moreover, at the very edge, species richness was higher than along transects, probably due to exchanges between primary forest and the open habitats. On the contrary, diversity values at forest edges were lower than in primary forest, with a demographic explosion of a few opportunistic phyllostomid species such as Carollia perspicillata and Artibeus jamaicensis. Species restricted to degraded habitat like Glossophaga soricina and Artibeus cinereus were still present 3 km away from the edge, where the proportion of C perspicillata was seven times higher than in primary forest at Nouragues. These changes in the community of bats have important consequences on seed and pollen dispersal. So edge effects may significantly affect both faunal and floral assemblage. We conclude that changes in bat community occur up to at least 3 km from forest edge, i. e. at a greater distance than that found for all other vertebrates previously studied. By their implications our results should be considered in habitat and species conservation management plans. |
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Dept Ecol & Gest Biodivers, UMR 5176, F-91800 Brunoy, France, Email: marguerite.delaval@wanadoo.fir |
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SOC NATL PROTECTION NATURE ACCLIMATATION FRANCE |
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0249-7395 |
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ISI:000244361200003 |
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EcoFoG @ eric.marcon @ |
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168 |
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Delaval, M.; Henry, M.; Charles-Dominique, P. |
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Interspecific competition and niche partitioning: Example of a neotropical rainforest bat community |
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Journal Article |
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2005 |
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Revue d'Ecologie (La Terre et la Vie) |
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Rev. Ecol.-Terre Vie |
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60 |
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2 |
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149-165 |
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To understand the organization of a bat community and the coexistence of sympatric species, it is essential to understand how species use and share common resources. First, we describe a bat community in a primary rainforest of French Guiana. The presence of particular roosting sites, such as caves, and the absence of disturbances are important local factors in structuring communities. In the course of this study, we focused on the three most common species of three vegetarian bat guilds (understorey frugivores, canopy frugivores and nectarivores). The local coexistence of these species is possible thanks to space, food and/or time partitioning. Space partitioning is consistent with the hypothesis that smaller bats with a more manoeuvrable flight tend to occupy more cluttered space less attractive to their competitors and have smaller home range. We observed a time partitioning that is likely to reduce competition among some frugivorous bat species by reducing direct interference during foraging. Besides an interest for the field community ecology, this study of a community living in a primary forest can be used as a reference for non disturbed habitat for conservation purposes. |
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Dept Ecol & Gestion Biodivers, UMR 5176, F-91800 Brunoy, France, Email: marguerite.delaval@wanadoo.fr |
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SOC NATL PROTECTION NATURE ACCLIMATATION FRANCE |
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0249-7395 |
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ISI:000230973300005 |
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EcoFoG @ eric.marcon @ |
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231 |
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Author |
Delnatte, C.; Meyer, J.-Y. |
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Plant introduction, naturalization, and invasion in French Guiana (South America) |
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Journal Article |
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2012 |
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Biological Invasions |
Abbreviated Journal |
Biol. Invasions |
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14 |
Issue |
5 |
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915-927 |
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Acacia mangium; French Guiana; Invasive plant; Melaleuca quinquenervia; Naturalization; Savanna |
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Continental tropical ecosystems are generally viewed as less vulnerable to biological invasions than island ones. Their apparent resistance to invasive alien species is often attributed to their higher native biota diversity and complexity. However, with the increase of human activities and disturbances and the accelerate rate of introductions of plant species, these apparently resilient continental ecosystems are now experiencing alien plant naturalization and invasion events. In order to illustrate this emergent phenomenon, we compiled a list of all known introduced and naturalized plant species in French Guiana (Guiana Shield, South America). A total of 490 alien plants were recorded, about 34% of which are currently naturalized, mainly species belonging to the Acanthaceae and Fabaceae (Faboideae) in the Eudicotyledons, and Poaceae (grasses) and Arecaceae (palms) in the Monocotyledons. The coastal dry and wet savannas appears to be vulnerable to plant invasion (with 165 naturalized species, about 34% of the alien flora), especially by Acacia mangium (Mimosaceae) and Melaleuca quinquenervia (Myrtaceae) which are forming localized but dense monotypic stands. Both tree species, intentionnally introduced for reforestation, rehabilitation, and as garden ornamentals and have the potential to spread with increasing human disturbances The number and abundance of naturalized alien plants in the relatively undisturbed tropical lowland rainforests and savannas remains still very low. Therefore, surveillance, early detection, and eradication of potential plant invaders are crucial; moreover collaboration with neighbouring countries of the Guiana Shield is essential to prevent the introduction of potentially invasive species which are still not present in French Guiana. © 2011 Springer Science+Business Media B.V. |
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13873547 (Issn) |
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Export Date: 2 May 2012; Source: Scopus; Coden: Blinf; doi: 10.1007/s10530-011-0129-1; Language of Original Document: English; Correspondence Address: Delnatte, C.; Herbier de Guyane, Institut de Recherche pour le Développement, B.P. 165, Cayenne, French Guiana; email: cesar_delnatte@yahoo.fr |
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EcoFoG @ webmaster @ |
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399 |
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Delph, L.F.; Arntz, A.M.; Scotti-Saintagne, C.; Scotti, I. |
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The Genomic Architecture of Sexual Dimorphism in the Dioecious Plant Silene Latifolia |
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Journal Article |
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2010 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
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64 |
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10 |
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2873-2886 |
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Artificial selection; genetic correlations; linkage map; sex-specific expression; sexual conflict |
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Evaluating the genetic architecture of sexual dimorphism can aid our understanding of the extent to which shared genetic control of trait variation versus sex-specific control impacts the evolutionary dynamics of phenotypic change within each sex. We performed a QTL analysis on Silene latifolia to evaluate the contribution of sex-specific QTL to phenotypic variation in 46 traits, whether traits involved in trade-offs had colocalized QTL, and whether the distribution of sex-specific loci can explain differences between the sexes in their variance/covariance matrices. We used a backcross generation derived from two artificial-selection lines. We found that sex-specific QTL explained a significantly greater percent of the variation in sexually dimorphic traits than loci expressed in both sexes. Genetically correlated traits often had colocalized QTL, whose signs were in the expected direction. Lastly, traits with different genetic correlations within the sexes displayed a disproportionately high number of sex-specific QTL, and more QTL co-occurred in males than females, suggesting greater trait integration. These results show that sex differences in QTL patterns are congruent with theory on the resolution of sexual conflict and differences based on G-matrix results. They also suggest that trade-offs and trait integration are likely to affect males more than females. |
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[Delph, Lynda F.; Arntz, A. Michele; Scotti, Ivan] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: ldelph@indiana.edu |
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WILEY-BLACKWELL PUBLISHING, INC |
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0014-3820 |
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ISI:000282573800006 |
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EcoFoG @ eric.marcon @ |
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31 |
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Denis, T.; Hérault, B.; Brunaux, O.; Guitet, S.; Richard-Hansen, C. |
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Weak environmental controls on the composition and diversity of medium and large-sized vertebrate assemblages in neotropical rain forests of the Guiana Shield |
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Journal Article |
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2018 |
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Diversity and Distributions |
Abbreviated Journal |
Diversity Distrib. |
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24 |
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11 |
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1545-1559 |
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biodiversity; birds; functional traits; mammals; refugia hypothesis; spatial patterns; Aves; Mammalia; Vertebrata |
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Aim: Despite their often high-trophic position and their contribution to many ecosystem functions, little is known about the factors affecting assemblage structure of medium- and large-sized neotropical vertebrates. We examined the relative roles played by the physical and biological environment, and by purely spatial processes, in shaping the composition and diversities of these vertebrate assemblages. Then, based on the theory that the Guianan forest cover shrank to isolated pockets during the late Pleistocene–Holocene, we tested if the past forest refugia may have shaped current vertebrate assemblages. Location: French Guiana, Guiana Shield, South America. Methods: Abundances of 19 medium- and large-sized vertebrates were estimated at 21 locations in undisturbed Guianan rain forests. Using taxonomic, functional and phylogenetic metrics, we partitioned the effects of a range of physical and biological environmental conditions and purely spatial predictors in shaping both assemblage composition and (alpha and beta) diversities. Results: We identified a significant, but weak relationship between taxonomic, functional and phylogenetic assemblage composition and environmental conditions. Assemblage diversity patterns were mainly explained by spatial predictors irrespective of the metrics. Current assemblage diversities are correlated with Pleistocene–Holocene forest history, with the highest alpha diversities outside of putative forest refugia, and the highest beta diversities inside these areas. Main conclusions: Current vertebrate assemblage composition is not strongly marked by common environmental factors. Our main conclusion is that assemblage composition results from individual species responses to the environment. Our findings also suggest that dispersal-related processes or more probably historical processes shape (alpha and beta) diversity patterns. In fact, forest fragmentation during Pleistocene–Holocene climate changes could have led to isolated vertebrate assemblages evolving into unique species assemblages creating the current high beta diversity inside refugia, whereas the lower habitat stability outside of refugia could have led to mixed assemblages in areas recolonized by forest vertebrates (current high alpha diversity outside of refugia). |
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IRD, UMR AMAP (Cirad, CNRS, INRA, Université de Montpellier), Montpellier, France |
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Blackwell Publishing Ltd |
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13669516 (Issn) |
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EcoFoG @ webmaster @ |
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833 |
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Denis, T.; Herault, B.; Jaouen, G.; Brunaux, O.; Guitet, S.; Richard-Hansen, C. |
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Black Curassow habitat relationships in terra firme forests of the Guiana Shield: A multiscale approach |
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2016 |
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The Condor |
Abbreviated Journal |
The Condor |
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118 |
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2 |
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253-273 |
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ABSTRACT The Black Curassow (Crax alector) is a large game bird with Vulnerable conservation status found in north-central South America. We examined its distributional pattern across French Guiana using a large number of environmental descriptors at 3 scales of analysis: landscape, forest type, and microhabitat. We used a hierarchical model with temporary emigration and imperfect detection for data collected by standard distance sampling methods at 35 study sites. At the landscape scale, Black Curassow density decreased with hunting pressure and increased with steeper slopes in both hunted and unhunted areas. Topography appeared to be a good proxy for Black Curassow ecological requirements and probably reflected habitat quality. At the forest scale, population density was negatively correlated with the abundance of palms and Mimosoideae and positively correlated with the abundance of Lauraceae. Botanical families did not directly influence Black Curassow distribution, but rather determined spatial patterns by being markers of a particular forest type. At the microhabitat scale, Black Curassows used hilltops more frequently than other parts of the local topographical gradient. Our multiscale analysis shows that this species' distribution can be explained by biotic or abiotic conditions, regardless of the scale. For conservation, we recommend maintaining connectivity between Black Curassow populations separated by hunted areas. Our predicted densities could be used to adapt hunting quotas across French Guiana's forests. We show that combining field and remote sensing data helps to understand the ecological processes responsible for Black Curassow habitat relationships. |
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American Ornithological Society |
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0010-5422 |
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doi: 10.1650/CONDOR-15-28.1 |
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EcoFoG @ webmaster @ |
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714 |
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Denis, T.; Richard-Hansen, C.; Brunaux, O.; Etienne, M.-P.; Guitet, S.; Herault, B. |
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Biological traits, rather than environment, shape detection curves of large vertebrates in neotropical rainforests |
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Journal Article |
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2017 |
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Ecological Applications |
Abbreviated Journal |
Ecol Appl |
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27 |
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5 |
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1564-1577 |
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abundance; camouflage; distance sampling; encounter rate; French Guiana; hunting vulnerability; line transect; Neotropical terra firme rainforests; relative abundance |
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Line transect surveys are widely used in Neotropical rainforests to estimate the population abundance of medium- and large-sized vertebrates. The use of indices such as encounter rate has been criticized because the probability of animal detection may fluctuate due to the heterogeneity of environmental conditions among sites. In addition, the morphological and behavioral characteristics (biological traits) of species affect their detectability. In this study, we compared the extent to which environmental conditions and species’ biological traits bias abundance estimates in terra firme rainforests in French Guiana. The selected environmental conditions included both physical conditions and forest structure covariates, while the selected biological traits included the morphological and behavioral characteristics of species. We used the distance sampling method to model the detection probability as an explicit function of environmental conditions and biological traits and implemented a model selection process to determine the relative importance of each group of covariates. Biological traits contributed to the variability of animal detectability more than environmental conditions, which had only a marginal effect. Detectability was best for large animals with uniform or disruptive markings that live in groups in the canopy top. Detectability was worst for small, solitary, terrestrial animals with mottled markings. In the terra firme rainforests that represent ~80% of the Amazonia and Guianas regions, our findings support the use of relative indices such as the encounter rate to compare population abundance between sites in species-specific studies. Even though terra firme rainforests may appear similar between regions of Amazonia and the Guianas, comparability must be ensured, especially in forests disturbed by human activity. The detection probability can be used as an indicator of species’ vulnerability to hunting and, thus, to the risk of local extinction. Only a few biological trait covariates are required to correctly estimate the detectability of the majority of medium- and large-sized vertebrates. Thus, a biological trait model could be useful in predicting the detection probabilities of rare, uncommon, or localized species for which few data are available to fit the detection function. |
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1939-5582 |
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EcoFoG @ webmaster @ |
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764 |
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