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Groc, S.; Delabie, J.H.C.; Longino, J.T.; Orivel, J.; Majer, J.D.; Vasconcelos, H.L.; Dejean, A. |
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Title  |
A new method based on taxonomic sufficiency to simplify studies on Neotropical ant assemblages |
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Journal Article |
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Year |
2010 |
Publication |
Biological Conservation |
Abbreviated Journal |
Biol. Conserv. |
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Volume |
143 |
Issue |
11 |
Pages |
2832-2839 |
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Keywords |
Higher-taxon surrogacy; “Indicator taxa” surrogacy; Multi-taxonomic assemblages; Mixed-level method; Terrestrial arthropod assemblages; Biodiversity indicators |
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Abstract |
Insects, particularly ants, are good bioindicators of the state of ecosystems. Nevertheless, incorporating them into conservation surveys is expensive due to problems associated with their identification, which is exacerbated by the fact that there are fewer and fewer taxonomists working today. “Taxonomic sufficiency” (TS), which identifies organisms to a level of taxonomic resolution sufficient enough to satisfy the objectives of a study, has never been applied to Neotropical ant communities. We analysed five Neotropical datasets representing ant assemblages collected with different sampling methods in various habitats. We first treated them using two complementary and cumulative TS methods, higher-taxon and “indicator taxa” surrogacies, before testing a new approach called “mixed-level method” that combines the two previous approaches. For the higher-taxon surrogacy, we showed that, above species, genus is the most informative taxonomic level. Then, mixed-level method provided more information on ant assemblages than did the two others, even though the “indicator taxa” surrogacy was based on relevant indicator genera. Although habitat type has no effect on its efficiency, this new method is influenced by the dataset structure and the type of sampling method used to collect data. We have thus developed a new method for analyzing Neotropical ant faunas that enables the taxonomic work linked to the identification of problematic species to be significantly reduced, while conserving most of the information on the ant assemblage. This method should enhance the work of Neotropical entomologists not specialised in taxonomy, particularly those concerned with biological conservation and indication. (C) 2010 Elsevier Ltd. All rights reserved. |
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[Groc, Sarah; Dejean, Alain] CNRS, Ecol Forets Guyane UMR 8172, F-97379 Kourou, France, Email: sarah.groc@laposte.net |
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ELSEVIER SCI LTD |
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0006-3207 |
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ISI:000283412300048 |
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EcoFoG @ eric.marcon @ |
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22 |
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Marti, G.; Eparvier, V.; Litaudon, M.; Grellier, P.; Gueritte, F. |
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Title |
A New Xanthone from the Bark Extract of Rheedia acuminata and Antiplasmodial Activity of Its Major Compounds |
Type |
Journal Article |
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Year |
2010 |
Publication |
Molecules |
Abbreviated Journal |
Molecules |
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Volume |
15 |
Issue |
10 |
Pages |
7106-7114 |
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Keywords |
Rheedia acuminata, Clusiaceae; xanthones; antiplasmodial activity; cytotoxicity |
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Abstract |
Bioassay-guided fractionation of the ethyl acetate bark extract of Rheedia acuminata led to the isolation of the new compound 1,5,6-trihydroxy-3-methoxy-7-geranyl-xanthone (1), together with four known compounds 2-5. These compounds were tested in vitro for their antiplasmodial activity on a chloroquine-resistant strain of Plasmodium falciparum (FcB1) and for their cytotoxicity against the human diploid embryonic lung cell line MRC-5. |
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[Eparvier, Veronique] CNRS, UPS2561, F-97300 Cayenne, France, Email: guillaume.marti@icsn.cnrs-gif.fr |
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MDPI AG |
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1420-3049 |
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ISI:000283587400030 |
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EcoFoG @ webmaster @ |
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282 |
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Roux, O.; Martin, J.M.; Ghomsi, N.T.; Dejean, A. |
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Title |
A Non-lethal Water-based Removal-reapplication Technique for Behavioral Analysis of Cuticular Compounds of Ants |
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Journal Article |
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Year |
2009 |
Publication |
Journal of Chemical Ecology |
Abbreviated Journal |
J. Chem. Ecol. |
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Volume |
35 |
Issue |
8 |
Pages |
904-912 |
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Keywords |
Ants; Behavioral assay; Behavioral ecology; Camponotus blandus; Chemical composition; Chemical ecology; Cuticular hydrocarbons; Gas chromatography-mass spectrometry; Live dummies; Solenopsis saevissima; Methods |
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Abstract |
Interspecific relationships among insects are often mediated by chemical cues, including non-volatile cuticular compounds. Most of these compounds are hydrocarbons that necessitate the use of solvents for their extraction, identification, and manipulation during behavioral assays. The toxicity of these solvents often precludes the removal and reapplication of hydrocarbons from and to live insects. As a consequence, dummies often are used in behavioral assays, but their passivity can bias the behavior of the responding insects. To overcome these limitations, we propose a method where cuticular compounds are extracted from live ants by placing them into glass vials half-filled with tepid water (ca. 34A degrees C) and vigorously shaking the vials to form an emulsion whose supernatant can be analyzed and/or reapplied to other ants. We demonstrate that cuticular compounds can be extracted from workers of the red fire ant, Solenopsis saevissima, and reapplied to the cuticle of workers from a sympatric species, Camponotus blandus (both Hymenoptera: Formicidae), while keeping the ants alive. Gas chromatographic-mass spectrometric analysis and behavioral assays were used to confirm the successful transfer of the behaviorally active compounds. |
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[Roux, Olivier; Martin, Jean-Michel; Dejean, Alain] Ecol Forets Guyane, CNRS, UMR 8172, F-97379 Kourou, France, Email: oroux@cict.fr |
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SPRINGER |
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0098-0331 |
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ISI:000269954400006 |
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EcoFoG @ eric.marcon @ |
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104 |
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Author |
Perrot, T.; Guillaume, S.; Nadine, A.; Jacques, B.; Philippe, G.; Stéphane, D.; Rodnay, S.; Mélanie, M.-R.; Eric, G. |
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Title |
A reverse chemical ecology approach to explore wood natural durability |
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Journal Article |
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Year |
2020 |
Publication |
Microbial Biotechnology |
Abbreviated Journal |
Microb. Biotechnol. |
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Volume |
13 |
Issue |
5 |
Pages |
1673-1677 |
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Keywords |
glutathione transferase; Article; biodegradation; data base; detoxification; ecology; enzyme activity; enzyme metabolism; forest; molecular dynamics; physical parameters; species identification; thermal analysis; Trametes versicolor; wood; wood durability |
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The natural durability of wood species, defined as their inherent resistance to wood-destroying agents, is a complex phenomenon depending on many biotic and abiotic factors. Besides the presence of recalcitrant polymers, the presence of compounds with antimicrobial properties is known to be important to explain wood durability. Based on the advancement in our understanding of fungal detoxification systems, a reverse chemical ecology approach was proposed to explore wood natural durability using fungal glutathione transferases. A set of six glutathione transferases from the white-rot Trametes versicolor were used as targets to test wood extracts from seventeen French Guiana neotropical species. Fluorescent thermal shift assays quantified interactions between fungal glutathione transferases and these extracts. From these data, a model combining this approach and wood density significantly predicts the wood natural durability of the species tested previously using long-term soil bed tests. Overall, our findings confirm that detoxification systems could be used to explore the chemical environment encountered by wood-decaying fungi and also wood natural durability. © 2020 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology. |
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Université de Lorraine, INRAE, LERMAB, Nancy, France |
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John Wiley and Sons Ltd |
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17517907 (Issn) |
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EcoFoG @ webmaster @ |
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955 |
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Author |
Marcon, E.; Traissac, S.; Lang, G. |
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Title |
A Statistical Test for Ripley’s Function Rejection of Poisson Null Hypothesis |
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Journal Article |
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Year |
2013 |
Publication |
ISRN Ecology |
Abbreviated Journal |
ISRN Ecology |
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2013 |
Issue |
Article ID 753475 |
Pages |
9 |
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Abstract |
Ripley’s K function is the classical tool to characterize the spatial structure of point patterns. It is widely used in vegetation studies. Testing its values against a null hypothesis usually relies on Monte-Carlo simulations since little is known about its distribution.
We introduce a statistical test against complete spatial randomness (CSR). The test returns the p-value to reject the null hypothesis of independence between point locations. It is more rigorous and faster than classical Monte-Carlo simulations. We show how to apply it to a tropical forest plot. The necessary R code is provided. |
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EcoFoG @ webmaster @ 852 |
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479 |
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Hénaut, Y.; Corbara, B.; Pélozuelo, L.; Azémar, F.; Céréghino, R.; Herault, B.; Dejean, A. |
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Title |
A tank bromeliad favors spider presence in a neotropical inundated forest |
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Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
PLoS ONE |
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Volume |
9 |
Issue |
12 |
Pages |
e114592 |
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Abstract |
Tank bromeliads are good models for understanding how climate change may affect biotic associations. We studied the relationships between spiders, the epiphytic tank bromeliad, Aechmea bracteata, and its associated ants in an inundated forest in Quintana Roo, Mexico, during a drought period while, exceptionally, this forest was dry and then during the flooding that followed. We compared spider abundance and diversity between “Aechmea-areas” and “control areas” of the same surface area. We recorded six spider families: the Dipluridae, Ctenidae, Salticidae, Araneidae, Tetragnathidae and Linyphiidae among which the funnel-web tarantula, Ischnothele caudata, the only Dipluridae noted, was the most abundant. During the drought period, the spiders were more numerous in the Aechmea areas than in the control areas, but they were not obligatorily associated with the Aechmea.
During the subsequent flooding, the spiders were concentrated in the A. bracteata patches, particularly those sheltering an ant colony. Also, a kind of specificity existed between certain spider taxa and ant species, but varied between the drought period and subsequent flooding. We conclude that climatic events modulate the relationship between A. bracteata patches and their associated fauna. Tank bromeliads, previously considered only for their ecological importance in supplying food and water during drought, may also be considered refuges for spiders during flooding. More generally, tank bromeliads have an important role in preserving non-specialized fauna in inundated forests. |
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Ecologie des Forêts de Guyane, Campus AgronomiqueKourou, France |
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Export Date: 23 December 2014 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
573 |
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Author |
Dejean, A.; Leroy, C.; Corbara, B.; Cereghino, R.; Roux, O.; Herault, B.; Rossi, V.; Guerrero, R.J.; Delabie, J.H.C.; Orivel, J.; Boulay, R. |
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Title |
A temporary social parasite of tropical plant-ants improves the fitness of a myrmecophyte |
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Journal Article |
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Year |
2010 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
97 |
Issue |
10 |
Pages |
925-934 |
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Keywords |
Ant-plant relationships; Biotic defense; Parasites of mutualisms; Temporary social parasites; Azteca; Cecropia |
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Abstract |
Myrmecophytes offer plant-ants a nesting place in exchange for protection from their enemies, particularly defoliators. These obligate ant-plant mutualisms are common model systems for studying factors that allow horizontally transmitted mutualisms to persist since parasites of ant-myrmecophyte mutualisms exploit the rewards provided by host plants whilst providing no protection in return. In pioneer formations in French Guiana, Azteca alfari and Azteca ovaticeps are known to be mutualists of myrmecophytic Cecropia (Cecropia ants). Here, we show that Azteca andreae, whose colonies build carton nests on myrmecophytic Cecropia, is not a parasite of Azteca-Cecropia mutualisms nor is it a temporary social parasite of A. alfari; it is, however, a temporary social parasite of A. ovaticeps. Contrarily to the two mutualistic Azteca species that are only occasional predators feeding mostly on hemipteran honeydew and food bodies provided by the host trees, A. andreae workers, which also attend hemipterans, do not exploit the food bodies. Rather, they employ an effective hunting technique where the leaf margins are fringed with ambushing workers, waiting for insects to alight. As a result, the host trees' fitness is not affected as A. andreae colonies protect their foliage better than do mutualistic Azteca species resulting in greater fruit production. Yet, contrarily to mutualistic Azteca, when host tree development does not keep pace with colony growth, A. andreae workers forage on surrounding plants; the colonies can even move to a non-Cecropia tree. |
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Address |
[Dejean, Alain; Leroy, Celine; Roux, Olivier; Orivel, Jerome] CNRS, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000282094100006 |
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EcoFoG @ eric.marcon @ |
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77 |
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Ollivier, M.; Baraloto, C.; Marcon, E. |
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Title |
A trait database for Guianan rain forest trees permits intra- and inter-specific contrasts |
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Journal Article |
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Year |
2007 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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64 |
Issue |
7 |
Pages |
781-786 |
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Keywords |
plant traits; tropical forest; French Guiana; functional groups; plasticity; ontogeny |
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We present a plant trait database covering autecology for rain forest trees of French Guiana. The database comprises more than thirty traits including autecology (e. g., habitat associations and reproductive phenology), wood structure (e. g., density and tension characteristics) and physiology at the whole plant (e. g., carbon and nitrogen isotopes) and leaf level (e. g., specific leaf area, photosynthetic capacity). The current database describes traits for about nine hundred species from three hundred genera in one hundred families. For more than sixty species, data on twelve morphological and ecophysiological traits are provided for individual plants under different environmental conditions and at different ontogenetic stages. The database is thus unique in permitting intraspecific analyses, such as the effects of ontogenetic stages or environmental conditions on trait values and their relationships. |
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INRA, Unit Mixte Rech Ecol Forets Guyane, Kourou, France, Email: baraloto.c@kourou.cirad.fr |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000250097700011 |
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EcoFoG @ eric.marcon @ |
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158 |
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Martin, J.M.; Roux, O.; Groc, S.; Dejean, A. |
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A type of unicoloniality within the native range of the fire ant Solenopsis saevissima |
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Journal Article |
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2011 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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334 |
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4 |
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307-310 |
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Ants; Solenopsis saevissima; Native range; Unicoloniality |
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To determine if a type of unicoloniality exists in the fire ant Solenopsis saevissima in its native range, we conducted intraspecific aggressiveness tests in French Guiana between workers originating from 15 human-disturbed sites. We identified two “colonial groups” spread over 54 km and 12.5 km, respectively. Workers from the same group never attacked each other, but inter-group confrontations resulted in a high level of aggressiveness. These large “colonial groups” enhances the threat occasioned by S. saevissima for both agriculture and the environment. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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[Martin, Jean-Michel; Roux, Olivier; Groc, Sarah; Dejean, Alain] Ecol Forets de Guyane UMR CNRS 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:000290364200007 |
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EcoFoG @ webmaster @ |
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314 |
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Author |
Marcon, E.; Puech, F. |
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Title |
A typology of distance-based measures of spatial concentration |
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Journal Article |
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Year |
2017 |
Publication |
Regional Science and Urban Economics |
Abbreviated Journal |
Regional Science and Urban Economics |
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62 |
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56-67 |
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Agglomeration; Aggregation; Economic geography; Point patterns; Spatial concentration |
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Over the last decade, distance-based methods have been introduced and then improved in the field of spatial economics to gauge the geographic concentration of activities. There is a growing literature on this theme including new tools, discussions on their specific properties and various applications. However, there is currently no typology of distance-based methods. This paper fills that gap. The proposed classification helps understand all the properties of distance-based methods and proves that they are variations on the same framework. © 2016 Elsevier B.V. |
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RITM, Univ. Paris-Sud, CREST, Université Paris-Saclay, Sceaux, France |
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Export Date: 17 January 2017 |
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EcoFoG @ webmaster @ |
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704 |
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