Titre :	Biodiversity: what is it ?
Type de document :	texte imprimé
Auteurs :	Thomas E. Lovejoy, Auteur
Editeur :	Joseph Henry Press
Année de publication :	1996
Importance :	p 7-14
Langues :	Anglais (eng)
Catégories :	SCIENCES DE LA VIE
Mots-clés :	BIODIVERSITE
Résumé :	In this chapter, biodiversity is viewed in a different way, one of them is that, one looks at the overall perspective of evolutionary time and at a great radiation from single ancestor and the second one is as a characteristic of natural communities. Somewhere, another way to look at the biodiversity is globally and collectively: current estimates of the total number of species run from 10 to 100 million, so one can break it down and look at certain segments of global totals, such as the diversity of higher plants, number of species or expressed as sheer weight. By the same token, others think about biodiversity as where it is most concentrated. The best known concentration is in tropical forests-those places near the equator where there is enough moisture sufficiently distributed through the year to maintain a tropical forest formation. Biodiversity matters to human beings in a variety of ways, there are important aesthetic and ethical dimensions but part of our existence depends on direct use, whether it is the botanical species that flavor gin or the wild relatives of a major agricultural crop. One of the most interesting aspects of biodiversity is the evolutionary tension between species of insects that exert grazing pressure on species of plants and the chemical and biochemical defenses that these plant species produce to reduce the pressure. Yet another way to think about biodiversity is the way in which it collectively provides us with “free services”.
Numéro du document :	A/BIO
Niveau Bibliographique :	2
Bull1 (Theme principale) :	BIOLOGIE
Bull2 (Theme secondaire) :	BIOLOGIE GENERALE

Biodiversity: what is it ? [texte imprimé] / Thomas E. Lovejoy, Auteur . - Joseph Henry Press, 1996 . - p 7-14.
Langues : Anglais (eng)

Catégories :	SCIENCES DE LA VIE
Mots-clés :	BIODIVERSITE
Résumé :	In this chapter, biodiversity is viewed in a different way, one of them is that, one looks at the overall perspective of evolutionary time and at a great radiation from single ancestor and the second one is as a characteristic of natural communities. Somewhere, another way to look at the biodiversity is globally and collectively: current estimates of the total number of species run from 10 to 100 million, so one can break it down and look at certain segments of global totals, such as the diversity of higher plants, number of species or expressed as sheer weight. By the same token, others think about biodiversity as where it is most concentrated. The best known concentration is in tropical forests-those places near the equator where there is enough moisture sufficiently distributed through the year to maintain a tropical forest formation. Biodiversity matters to human beings in a variety of ways, there are important aesthetic and ethical dimensions but part of our existence depends on direct use, whether it is the botanical species that flavor gin or the wild relatives of a major agricultural crop. One of the most interesting aspects of biodiversity is the evolutionary tension between species of insects that exert grazing pressure on species of plants and the chemical and biochemical defenses that these plant species produce to reduce the pressure. Yet another way to think about biodiversity is the way in which it collectively provides us with “free services”.
Numéro du document :	A/BIO
Niveau Bibliographique :	2
Bull1 (Theme principale) :	BIOLOGIE
Bull2 (Theme secondaire) :	BIOLOGIE GENERALE