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Download Biodiversity: variety of life on EARTH
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Transcript
BIODIVERSITY: VARIETY OF LIFE ON EARTH IS A MEASURE OF BOTH THE NUMBER OF SPECIES IN AN AREA AND THEIR RELATIVE ABUNDANCE BD: MEASURED IN 3-different ways Species diversity Habitat diversity Genetic diversity So Biodiversity refers to amount of biological or living diversity per unit area. It includes the concepts of species, habitat and genetic diversities. Species Diversity This refers to the variety of species per unit area It includes both the number of species present and their relative abundance Higher the species diversity of an ecosystem, the greater the complexity Habitat diversity This means the range of different habitat in an ecosystem It is associated with the variety of ecological niches A woodland may contain many different habitat and hence a high habitat diversity (compared to a desert) Genetic diversity This means the range of genetic material present in a gene pool or population of a species Genes are sections of DNA found in the nucleus of all cells A large gene pool leads to a high genetic diversity
