modification de la biodiversité


Comment préserver la biodiversité ?

L’Homme prend aujourd’hui conscience de l’importance de préserver la biodiversité dont sa propre survie dépend. Les politiques doivent donc prendre des décisions permettant d ’exploiter à long terme les ressources naturelles de la planète tout en les préservant (principe du Développement Durable ).

Quels sont les actions de l’homme conduisant à la modification de la biodiversité ?

Au travers d’exemples précis, il s’agira d’ identifie r les différentes actions de l’Homme conduisant aujourd’hui à la modification de la biodiversité. Les scientifiques dénombrent aujourd’hui 1,76 millions d’espèces connues. Parmi ces espèces 36% sont aujourd’hui menacées d’extinction.

Comment l'homme peut-il faire évoluer la biodiversité?

Par la construction de routes et d'habitations, l'Homme morcelle le paysage et fragmente ainsi les habitats naturels . Il perturbe donc le fonctionnement général des espèces et donc des écosystèmes. Les espèces qui vivaient alors en équilibre subissent une forte perturbation.

Quels sont les effets des temps géologiques sur la biodiversité ?

Au cours des temps géologiques, il est arrivé que la biodiversité subisse des modifications brutales: ce sont des crises biologiques. Ces crises correspondent à des extinctions massivesde nombreuses espèces sur toute la surface du globe. Elles sont dues à des évènements exeptionnels (hute d’une météorite, ativité volanique intense…).

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