Biodiversity, 2004 by Christian Leveque, Jean-Claude Mounolou

By Christian Leveque, Jean-Claude Mounolou

The identify offers an outline of the present wisdom in regards to the range of the residing global and a few of the difficulties linked to its conservation and sustainable use. masking either the basics of the topic, in addition to the most recent learn, Biodiversity provides key conservation concerns inside a framework of world case studies.Starting with a precis of the concept that of biodiversity, the textual content then explores such matters as species richness, ecological platforms, the implications of human actions, range and human health and wellbeing, genetic assets, biotechnology and conservation. Comprehensive advent to key matters surrounding the learn of biodiversity.Extensive bibliography and references to varied suitable websites.Introduces present examine within the box inside of a framework of valuable case reports.

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34 2 BIOLOGICAL DIVERSITY log specific richness 3 2 African rivers European rivers log surface of basin (km2) 1 2 3 4 5 6 7 Figure 2 . 4 Biomes as ecological units The distribution of species over the surface of the Earth is not random. It results from a combination of ecological factors, interacting with the preferences and abilities of organisms. On the basis of the combined factors of precipitation and temperature, the Earth can be divided into large morphoclimatic domains. On an extremely macroscopic scale, four ecoclimatic zones can be identified: tropical, hot and humid; temperate humid; polar; and arid.

The DNA molecule is chemically more stable than the RNA molecule, so the genetic message is more faithfully preserved. 1 Genetic diversity and the universality of life The present diversity of forms and structures among living things is the expression of a genetic and molecular diversity that is specific to each individual, each population and each species. Understanding the mechanisms that create genetic diversity and the historic processes that enable its perpetuation or, conversely, contribute to its extinction, is important not only to biologists seeking to understand and depict the development of living things, but also for professionals working to maintain and improve the adaptive and productive potential of ‘useful’ species for their own benefit (conservation and valuation of genetic resources).

Generally speaking, biological diversity is greater in benthic surroundings than in pelagic surroundings, and greater in coastal regions (where there is a greater diversity of habitats) than in the high seas. It is organized around several major domains. The continental plateau is the coastal zone extending out to an average depth of 200 m. Called the neritic zone, it is home to the bulk of benthic organisms. In tropical regions, this zone also comprises coral reefs, which, to draw an analogy, are to marine biodiversity what tropical forest systems are on land.

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