ENV100Y5 Lecture Notes - Lecture 30: Species Evenness, Deep Ecology, Ecotourism
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ENV100Y5 Full Course Notes
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Session 30: conservation of species & habitats (i) (18-11-15) Plants: in response to herbivory, they produce: cyanide, caffeine, cocaine, mescaline, nicotine, atropine, strychnine, morphine, quinine, codeine, digitalis, and many, many, more. Tourism directed toward exotic, often threatened, natural environments, especially to support conservation efforts and observe wildlife . Incentive to preserve natural areas and reduce impacts on the landscape and on native species. Biodiversity increases the stability and resilience of communities and ecosystems. Decreased biodiversity reduces natural system"s ability to function and provide services. Evenness = distribution of abundance over species. Three measures we can use to describe spatial patterns of species richness: Diversity (alpha diversity) = number of species in local area of homogeneous habitat. Diversity (gamma diversity) = number of species in large geographic area that comprises many habitats. Diversity (beta diversity) = turnover in species from one local area to another.
