Biodiversity and ConservationBiodiversity1.diversity of ecosystems2.diversity/variety of species - species richness- relative abundance3. genetic variation within each speciesBiodiversity•Diversity of organisms in a given area•Two elements:– Interspecific variation or species diversity (studied by ecologists)– Intraspecific variation or gene diversity (studied by geneticists)Biodiversity•Biologically diverse ecosystems are in general more stable than simple ones –Species richness characterizes an ecosystem’s biodiversity•Two factors are important in promoting biodiversity–Ecosystem size– Latitude •Larger ecosystems…•A reduction in an ecosystem size, will reduce the number of species it can support–extinction may occurEcosystem Size•The number of species in the tropics is far more than that in the arctic regionLatitude•Two principal reasons:– 1. Length of growing season– 2. Climatic stability
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