jeudi 19 juillet 2007

Why should we care if the woodpecker goes?

Un extrait d'entretien que je repique du fantastique TED Blog.

Bill Moyers interview le biologiste E.O. Wilson sur l'importance de la biodiversité :
Wilson: How many species going extinct or becoming very rare do you think it takes before you see something happening? We now know from experiments and theory that the more species you take out of an ecosystem like a pond, a patch of forest, a little bit of marine shallow environments, the more you take out the less stable it becomes. If you have a tsunami or a severe drought or a fire, it is less likely that that ecosystem, that body of species in that particular environment, is going to come back all the way. So it becomes less stable with fewer species. And then we also know it becomes less productive. In other words, it's not able to produce as many kilograms of new matter from photosynthesis and passage through the ecosystem. It's less productive. It sure is less interesting, though, isn't it? And more than that: we lose the services of these species.

Moyers: The services of these species.

Wilson: Yes, services of these species to us. Like pollination and water purification.

Moyers: That we get free from nature.

Wilson: Yeah. Here's an easy way to remember it.

La vidéo se trouve ici.

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