Biodiversity, 2004 by Christian Leveque, Jean-Claude Mounolou

By Christian Leveque, Jean-Claude Mounolou

The name offers an summary of the present wisdom in regards to the variety of the residing global and some of the difficulties linked to its conservation and sustainable use. masking either the basics of the topic, in addition to the newest examine, Biodiversity offers key conservation concerns inside of a framework of worldwide case studies.Starting with a precis of the idea that of biodiversity, the textual content then explores such topics as species richness, ecological platforms, the implications of human actions, range and human health and wellbeing, genetic assets, biotechnology and conservation. Comprehensive creation to key concerns surrounding the research of biodiversity.Extensive bibliography and references to various correct websites.Introduces present study within the box inside a framework of valuable case reviews.

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A strong argument in support of this hypothesis is that the precursors of RNA, the ribonucleotides, transform into the precursors of DNA, the deoxyribonucleotides, in a complex chemical reaction triggered by advanced enzyme proteins called ribonucleotide-reductases. Thus, to a certain extent, DNA can be seen as a modified form of RNA specialized in preserving information. 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.

As a general rule, maximum species richness lies within the range of 1000–1500 m for pelagic communities and 1000–2000 m for 2 . 5 THE GEOGRAPHIC DISTRIBUTION OF BIOLOGICAL DIVERSITY 33 megabenthos. Such gradients may result from the combined effects of depth and latitude. The ocean basin is formed by the abyssal plain at 4000–6000 m below sea level. It has deeper troughs as well as mid-ocean crests (2000–3000 m). Until quite recently, life in the ocean depths was held to be scarce, but evidence has emerged that deep-sea sediments are home to a large variety of species, the majority of which have not yet been described with any degree of precision.

Accordingly, the aim of taxonomy was to compile an inventory of all the existing forms of life and describe their specific characteristics. Linnaeus formalized this concept by defining each species in terms of a single type (holotype). A species was constituted by the sum of individuals identical to each other and to its ‘type’ specimen. In other words, the sample specimen served to describe and characterise the species in morphological terms. Sample specimens were stored in a museum for future reference or as a sort of standard for later comparisons.

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