ENV100Y5 Lecture 27: ENV100 - 27 - Biodiversity
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ENV100Y5 Full Course Notes
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Biodiversity helps maintain ecosystem functions: biodiversity increases the stability and resilience of communities and ecosystems, decreased biodiversity reduces natural system"s ability to function and provide services. To keep every cog and wheel is the first precaution of intelligent tinkering . How do we measure species diversity: abundance = number of individuals (regardless of the species, richness = number of different species, evenness = distribution of abundance over species. If the same species are found in different habitats over a wide area, then: If different species are found in different habitats over a wide area, then: Tailed frog: only in cold, clear mountain streams sensitive to siltation, warming: if species are mostly generalists, -diversity is low, if species are mostly specialists, -diversity is high leopard frog: found in lakes, rivers, ponds, streams, wetlands. Amazon basin: 300 tree species per hectare, tree species composition changes little over >1,400 km is low.
