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Cortesero, A.-M.; Proffit, M.; Duplais, Christophe.; Viard, V. |
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Chemical Ecology: An Integrative and Experimental Science |
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2016 |
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Chemical Ecology: New Advances |
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23-46 |
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Biological invasions; Chemical ecology; Non-indigenous species; Semiochemicals; Trophic network |
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All living organisms, whether plants, animals or microorganisms, interact through chemical compounds. Chemical ecology seeks to identify the compounds that are involved in these interactions, the structures that allow their biosynthesis, emission and perception. It deciphers their implication in the functioning and the evolution of the living organisms whether at a molecular, individual, population or ecosystemic scale. Semiochemicals are involved in the interactions of organisms among themselves and with their environment. Involved in numerous interactions, semiochemicals play an essential role in the structuring of trophic networks and the evolution of the species. Chemical ecology also sheds light on certain large ecological problems like biological invasions and helps envision new methods for managing invasive species. The chemical signals emitted in the environment by local species play a role from the beginning of the introduction process, notably for the detection of habitats favorable to the establishment of non-indigenous species. © ISTE Ltd 2016. |
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UMR 7144 Adaptation et Diversité en Milieu Marin, Station biologique de Roscoff CNRS, UPMC, Roscoff, France |
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Export Date: 22 March 2017 |
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EcoFoG @ webmaster @ |
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279 |
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Maillard, Basile |
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Variations interspécifiques de traits fonctionnels liés à l'acquisition et au stockage des ressources chez les broméliacées |
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2016 |
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24 |
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broméliacées ; endophytes racinaires ; feuilles ; traits fonctionnels ; trichonnes foliaires ; types écophysiologiques |
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Les broméliacées, présentant différentes écologies et adaptations, ont été classées en 5 types écophysiologiques en fonction de la forme de vie (épiphyte, terrestre ou lithophyte), la morphologie de la rosette (avec ou sans réservoir d’eau), le métabolisme photosynthétique (C3 ou CAM) ou encore le caractère absorbant ou non des trichomes et racines. L’objectif du stage était de caractériser si certains traits foliaires et racinaires pouvaient discriminer les types écophysiologiques représentés par 14 espèces. Les résultats montrent que les parties apicales et basales des feuilles se spécialisent différemment en fonction de l’exposition lumière. La taille du disque central des trichomes augmente avec la sécheresse. La densité de trichome de la partie apicale supérieure résulte d’un trade-off entre l’acquisition de l’eau et l’exposition à la lumière. Aussi, le genre A echmea présente un grand nombre de stomates, les T illandsia atmosphériques un plus grand recouvrement de la surface foliaire par les trichomes et les C3 ont un LMA plus
petit. Enfin, les associations fongiques permettent de différencier le genre T illandsia des autres genres. Pour conclure, certains traits permettent de discriminer les types écophysiologiques mais ce sont avant tout la disponibilité en eau et l’exposition à la lumière qui façonnent les traits fonctionnels. |
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EcoFoG @ carole.legrand @ |
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291 |
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Ribaud, Margot |
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Comment améliorer la cartographie de la biodiversité de la forêt amazonienne ? |
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2016 |
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29 |
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cartographie ; biodiversité ; forêt amazonienne |
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EcoFoG @ carole.legrand @ |
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292 |
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Houël, Emeline ; Rodrigues, Alice ; Nicolini, Eric ; Ngwete, Onoefé ; Duplais, Christophe ; Stien, Didier ; Amusant, Nadine |
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Natural durability of Sextonia rubra, an Amazonian tree species: description and origin |
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2017 |
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IRG/WP |
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17 |
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10887 |
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17 |
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EcoFoG @ carole.legrand @ |
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299 |
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Amusant, Nadine ; Flora, Claudiane ; Beauchêne, Jacques ; Houël, Emeline ; Duplais, Christophe. |
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A review on predilection methods of wood natural durability |
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Conference Article |
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2017 |
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IRG/WP |
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17 |
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10892 |
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15 |
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EcoFoG @ carole.legrand @ |
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300 |
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Fu, T. ; Touboul, D. ; Della-Negra, S. ; Houël, E. ; Amusant, N. ; Duplais, C. ; Brunelle, A. |
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Localization od bioactive metabolites in durable ? Tropical tree Sextonia rubra (Lauracaea) with argon and bismuth cluster dual beam depth profiliing and imaging |
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Conference Article |
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2016 |
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Imaging mass spectrometry conference – Ustron – Pologne – Octobre 2016 |
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Many tropical tree species generate natural decay resistance by producing bioactive metabolites. Among them, Sextonia rubra (Lauraceae) is a widely exploited species for construction in French Guiana. Rubrynolide and rubrenolide, which are secondary metabolites isolated from the stem wood of S. rubra, exhibit potent antifungal and termiticidal activities that result in the exceptional durability of the heartwood. Although the structure and total synthesis of these two biologically active compounds have been well described in literature, little is known about their cellular localization or biosynthesis process in living trees. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) has been well known for its high lateral resolution imaging with a typical beam size of 0.4-2 µm, thus sufficient to image the wood surface at subcellular level.
Wood surfaces of sapwood, transition zone and heartwood from living trees of S. rubra were prepared with ultramicrotome using diamond knife. Each surface was mapped by Bi3+ cluster TOF-SIMS with high lateral resolution (~ 0.4 µm) which was achieved by employing burst alignment primary ion focusing mode with an extraction delay of the secondary ions to improve mass resolution. 3D imaging of a multi-structure wood sample was performed using dual beam depth profiling method, with 25 keV Bi3+ and 10 keV Ar1000+ as analysis and sputter beam, respectively. To examine the effect of life-history traits on the production of bioactive metabolites, the corresponding counterparts from a tree which had suffered stress during growth were investigated as well. |
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EcoFoG @ carole.legrand @ |
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302 |
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Fisher, Gregory L. ; Fu, Tinting ; Touboul, David ; Della-Negra, Serge ; Houël, Emeline ; Amusant, Nadine ; Duplais, Christophe ; Brunelle, Alain |
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Elucidation of natural product biosynthesis in Amazonian Sextonia rubra via 100 nm-scale TOF-SIMS tandem MS imaging |
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2017 |
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21st International Conference on Secondary Ion Mass Spectroscopy (SIMS21), Krakow (Poland), 10-15/09/2017 |
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Husson, Julie |
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Impact de l'exploitation sélective sur les relations biomasse et diversité floristique en forêt guyanaise |
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16 |
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Diversité ; biomasse ; indices de diversité ; exploitation forestière ; théorie de la niche complémentaire |
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Les relations biomasse et diversité en forêt tropicale sont relativement mal connues de la communauté scientifique. Nous avons étudié ces relations sur le site de Paracou en Guyane, une forêt soumise à plusieurs intensités d’exploitation. Nous nous sommes également intéressés à la modulation de la relation à travers 3 mesures de diversité différentes (la richesse générique, l’indice de Shannon et l’indice de Simpson). Nos résultats ne montrent aucune relation forte entre la biomasse et la diversité en zone non perturbée, quelque soit la mesure de diversité utilisée. En zone exploitée, les indices de Shannon et Simpson ne révèlent aucune relation, en revanche la richesse générique met en évidence une relation positive robuste avec la biomasse. La relation biomasse diversité est ainsi modulée par l’impact de l’exploitation forestière et la mesure de diversité utilisée. Cependant, cette relation positive ne peut être expliquée par la théorie de la niche complémentaire. En effet, la diversité au sein des arbres de plus fort diamètre est corrélée négativement avec la biomasse. Par ailleurs, cette étude, en accord avec la littérature, attestent d’une diversité plus importante en parcelles exploitées et suggère un pic de diversité pour un taux de perturbation intermédiaire, bien que ce résultat soit peu robuste. Des analyses complémentaires notamment sur la composition floristique sont nécessaires pour affiner la compréhension de ces résultats. Cette étude met également en évidence le gain certain de l’utilisation de plusieurs mesures de diversité, de part l’apport d’une vision complémentaire de la diversité. |
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Master's thesis |
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EcoFoG @ webmaster @ |
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310 |
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Leroy, Céline ; Orivel, Jérôme ; Dejean, Alain ; Corbara, Bruno |
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Des arbres et des fourmis : échanges de bons procédés |
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2017 |
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Espèces |
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25 |
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14-23 |
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Phylogénétique ; Archéozoologie ; Entomologie ; Ecologie ; Microbiologie ; Exobiologie ; Ophiologie |
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Sous les tropiques, plantes et fourmis sont impliquées dans nombre d’interactions plus ou moins étroites. Au coeur de réseaux d’interactions impliquant bien d’autres espèces, en échange de protection et de quelques nutriments, des “plantes à fourmis” procurent, dans une relation mutualiste, gite et couvert à des “fourmis à plantes”. |
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EcoFoG @ webmaster @ |
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312 |
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Richard-Hansen, Cécile ; Ackermann, Luc ; Berzins, Rachel ; Devillechabrolle, Jennifer ; Foch, Thibaut ; Goguillon, Bertrand ; Korysko, François ; Rinaldo, Raphaëlle |
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The return of white lipped peccaries in two main protected areas of French Guiana: update and insights into an uncommon population dynamics |
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2018 |
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Suiform Soundings |
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17 |
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37-40 |
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