Processus Evolutif
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Home > Art, Film & Photography > Processus Evolutif: Extinction Des Especes, Duplication, Evolution En Reponse Aux Changements Climatiques, Adaptation, Convergence Evolutive
Processus Evolutif: Extinction Des Especes, Duplication, Evolution En Reponse Aux Changements Climatiques, Adaptation, Convergence Evolutive

Processus Evolutif: Extinction Des Especes, Duplication, Evolution En Reponse Aux Changements Climatiques, Adaptation, Convergence Evolutive


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About the Book

Ce contenu est une compilation d'articles de l'encyclopedie libre Wikipedia. Pages: 28. Non illustre. Chapitres: Extinction des especes, Duplication, Evolution en reponse aux changements climatiques, Adaptation, Convergence evolutive, Course aux armements, Speciation, Coevolution, Radiation evolutive, Evolution insulaire, Theorie de la reine rouge, Gigantisme insulaire, Gigantisme abyssal, Evolution parallele, Heterochronie, Reversion, Anagenese, Cladogenese, Etranglement genetique. Extrait: En biologie et ecologie, l'extinction est la disparition totale d'une espece ou groupe de taxons, reduisant ainsi la biodiversite. On compte dans le passe 5 crises ecologiques majeures. Pour chacune, le temps de resilience a ete plus du double de celui de la crise Le dodo, ici illustre, est un exemple d'extinction souvent cite.A travers l'evolution, de nouvelles especes apparaissent par le processus de la speciation - ou de nouvelles varietes d'organismes emergent et se developpent quand elles sont capables de trouver et d'exploiter une niche ecologique - et des especes disparaissent quand elles ne sont plus capables de survivre dans des conditions changeantes ou face a une concurrence qu'elles ne peuvent affronter. Typiquement, une espece s'eteint en 5 a 10 millions d'annees (hors periode de crise biogeologique), bien que certaines especes, appelees fossiles vivants, survivent pratiquement inchangees pendant des centaines de millions d'annees, comme la famille des Ginkgoaceae, qui date d'environ . Seulement 1/1000 des especes ayant existe sont encore vivantes aujourd'hui. Les donnees archeopaleontologiques montrent que les taux d'extinction, avant la propagation de l'homme sur toute la planete, etaient invariablement faibles, et que les extinctions de masse etaient des evenements relativement rares. Demarrant approximativement il y a 100 000 ans et coincidant avec la croissance du nombre et de la repartition des hommes, l'extinction des especes a augmente a un taux sans pre...


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Product Details
  • ISBN-13: 9781159904692
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Weight: 73 gr
  • ISBN-10: 1159904693
  • Publisher Date: 27 Aug 2011
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Sub Title: Extinction Des Especes, Duplication, Evolution En Reponse Aux Changements Climatiques, Adaptation, Convergence Evolutive
  • Width: 189 mm


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