evolution et modification de la biodiversité


  • Quelle est l'évolution de la biodiversité ?

    La biodiversité a changé depuis l'apparition des premières formes de vie sur Terre. Elle évolue et continue de changer actuellement. On observe une modification de la répartition des esp?s ainsi que des modifications génétiques au cours du temps. La biodiversité passée s'étudie gr? aux fossiles.
  • Comment la biodiversité a évolué au cours du temps ?

    Les variations de la biodiversité au cours du temps
    La biodiversité a connu ses premières variations sans l'humain, provoquée par de nombreux phénomènes naturels, comme la chute d'astéro?s, la modification naturelle du climat et des courants océaniques, des éruptions volcaniques massives
  • Quels sont les processus évolutifs à l'origine des modifications de la biodiversité ?

    Un mécanisme évolutif : la sélection naturelle
    Ainsi les mutations, la dérive génétique et la sélection naturelle, en modifiant les populations, sont les mécanismes responsables de l'évolution de la biodiversité. Ces mécanismes peuvent entraîner la formation d'une nouvelle esp?, différente de l'esp? initiale.
  • La biodiversité évolue en permanence. Cette évolution est observable sur de courtes échelles de temps, tant au niveau génétique que spécifique. L'étude de la biodiversité du passé par l'examen des fossiles montre que l'état actuel de la biodiversité correspond à une étape de l'histoire du vivant.
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