"A l'heure ou les forets tropicales sont gravement menacees, il importe d'analyser et comprendre leurs mecanismes de regeneration naturelle. Le processus de dissemination des graines par les animaux frugivores apparait comme la "cle de voute" de cette regeneration. La complexite du processus resulte d'une symbiose entre la faune et la flore."
"Des chercheurs français étudient depuis une quinzaine d'années les mécanismes de régénération forestière en conditions naturelles. Les processus de dissémination des graines par les animaux frugivores apparaissent comme la clé de voûte de cette régénération . Les images souvent réalisées au cœur même de la canopée, sur des plates-formes installées à plus de 40 ou 50 mètres de hauteur nous permettent de découvrir la complexité de la forêt. A l'heure où les forêts tropicales sont gravement menacées, la compréhension des mécanismes de régénération naturelle peut contribuer à une exploitation rationnelle et à la préservation du patrimoine des ressources forestières."
""Une équipe de scientifiques étudie la forêt tropicale de Guyane pour comprendre les mécanismes de cet écosystème, en particulier les modalités de la reconstitution forestière en conditions naturelles, dans une région inhabitée où la faune et la flore sont intactes. Les images ont été réalisées dans la canopée, à partir de plates-formes installées à 40 ou 50 mètres de hauteur. Après l'étude de la diversité des biotopes de la forêt tropicale et de l'abondance des espèces végétales, sont observés les animaux frugivores (oiseaux, singes, chauves-souris, rongeurs, tapirs ...) qui assurent le transport et la dissémination de la majeure partie des graines, soit en les laissant tomber lors de la consommation de la pulpe, soit en avalant le fruit entier et en rejetant les graines après leur passage dans le tube digestif, ces dernières gardant intactes leurs facultés de germination. Le fruit étant rarement consommé sur place, le rejet des graines a lieu pendant le déplacement vers les dortoirs ou les lieux de parade. Les différentes techniques de repérage et de collecte des fruits mûrs sont également étudiées."
Centre national de la recherche scientifique (France)$, prod.
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Écologie des forêts pluviales Guyane Bandes vidéos.
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forêt régénération (biologie) Guyane française (France) [enregistrement vidéo]
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Forêts Conservation des ressources Guyane Bandes vidéos.
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