ENV100Y5 Chapter : ch9.pdf
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ENV100Y5 Full Course Notes
Verified Note
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Document Summary
Plants: in response to herbivory, they produce: cyanide, caffeine, cocaine, mescaline, nicotine, atropine, strychnine, morphine, quinine, codeine, digitalis, and many more. Incentive to preserve natural areas and reduce impacts on the landscape and on native species. Deep ecology- concepts that nature has intrinsic rights and value. Biodiversity increases the stability and resilience of communities and ecosystems. Decreased biodiversity reduces natural system"s ability to function and provide services. If the same species are found in different habitats over a wide area, then: If different species are found in different habitats over wide area, then beta > 1 (high beta diversity) If species are mostly generalist, beta diversity is low. If species are mostly specialists, beta diversity is high. Leopard frog: found in lakes, rivers, ponds, streams, wetlands. Tailed frog: only in cold, clear mountain streams, sensitive to siltation warming. Tree species composition changes little over > 1,400 km beta is low. Completely different tree assemblages 50 km apart beta is high.
