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Maillard, Basile |
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Title |
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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Title |
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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Lopez, Manon |
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Les plantations forestières en Guyane : sont elles une solution durable à l'approvisionnement bois dans les prochaines années ? |
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2016 |
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plantations forestières ; Guyane française ; filière bois ; carbone |
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ONF |
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Cayenne - Guyane française |
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EcoFoG @ carole.legrand @ |
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293 |
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Author |
Dourdain, Aurélie |
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Title |
Valorisation des données spatiales de l'UMR “Ecologie des Forêts de Guyane” |
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2017 |
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Système d’information ; Base de données spatialisée ; Cartographie sur Internet ; Données forestières ; Réseau GuyaFor ; Paracou ; PostgreSQL; PostGIS ; LizMap ; Qgis |
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L’évolution importante du territoire guyanais appelle les décideurs locaux et la communauté scientifique à acquérir de nouveaux outils pour l’aménagement du territoire. Ainsi, l’objectif de l’UMR EcoFoG a été la valorisation et la distribution des données spatiales de Paracou. Afin de bien répondre à ces besoins, un questionnaire et une analyse des besoins ont été réalisés. Maintes solutions ont été étudiées en fonction des besoins recensés. Le choix final pour cette mission a été de développer dans un premier temps une base de données spatiales, puis, dans un second temps, une plateforme en ligne pour la visualisation de ces données. L’outil s’est déployé avec succès, ainsi que le déroulement de cette mission. Ce rapport apporte donc une réflexion sur la conduite de ce projet, mais également un exposé de la partie technique. |
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SILAT |
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Montpellier - France |
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EcoFoG @ carole.legrand @ |
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294 |
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Vigo Cogueto, Caroline |
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S'adapter pour résister : trente ans d'évolution de la stratégie des ONG environnementalistes brésiliennes |
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2017 |
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Cette recherche est consacrée à l’étude des stratégies de gestion des organisations non-gouvernementales environnementalistes (ONGE) en Amazonie brésilienne dans les 30 dernières années. Elle s’inscrit dans un travail plus large, mené dans le cadre de plusieurs projets de recherche (PRIGOUE, GEODD, REKABIOS), et s’intéresse, plus particulièrement, aux ONGE brésiliennes intervenant sur le terrain et à leurs stratégies d’alliances et de développement interne. Les données comprennent plus d’une trentaine d’entretiens, et les résultats montrent, entre autres, i) une tendance à l’extinction des petites ONGE et au renforcement des grandes ; ii) une alternance de pouvoir entre les ONGE et l’État, et une apparente dépendance des premières face au deuxième ; iii) un affaiblissent des alliances entre ONGE lorsque celles avec l’État se renforcent ; iv) l’émergence récente de nouveaux arrangements de partenariats entre les ONGE face à l’échec des réseaux d’auparavant. Nos résultats confirment aussi le socio-environnementalisme comme résultat d’une stratégie convergente des environnementalistes et du mouvement social. Finalement, nous montrons que les projets de « développement durable », devenus hégémoniques parmi les ONGE, s’adaptent bien au socio-environnementalisme tout comme à la « responsabilité sociale et environnementale » des entreprises, mais ces deux concepts peuvent être, dans la pratique, incompatibles. |
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Master's thesis |
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MRM |
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Montpellier - France |
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EcoFoG @ carole.legrand @ |
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295 |
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Richard-Hansen, Cécile ; Berzins, Rachel ; Petit, Matthis ; Goguillon, Bertrand ; Rux, Ondine ; Clément, Luc |
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Use of corridors and fragmented landscapes by white lipped peccaries in French Guina |
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2017 |
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54th annual meeting of the association for tropical biology and conservation – Merida – Yucatan – Mexico – 9-14 july 2017 |
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271 |
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Tayassu pecari ; corridor ; habitat ; conservation |
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ATBC |
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EcoFoG @ carole.legrand @ |
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298 |
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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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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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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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Houël, Emeline ; Rodrigues, A.M.S. ; Amusant, N. ; Odonne, G. ; Courtois, E. ; Beauchêne, J. ; Jahn-Oyac, A. ; Bessière, J.M. ; Gonzales, G. ; Duplais, C. ; Espindola, L. S. ; Eparvier, V. ; Deharo, E. ; Dusfour, I. ; Stien, D. |
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How can plant defences lead to valuable products? Inspiration from plant complexity in phytochemistry |
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2016 |
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Celebration of the 50th anniversary of the CAY Herbarium – “The importance of the herbarium in plant science” International conference – Cayenne – French Guiana – 5-8 October 2015 |
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69 |
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Flora of the Guianas (FOG) Meeting and Seminars |
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EcoFoG @ carole.legrand @ |
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301 |
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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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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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