ENV100Y5 Lecture 30: CHAPTER 9 LECTURE NOTES - SESSION 30, 31, 32
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ENV100Y5 Full Course Notes
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Session 30: conservation of species and habitats (i) november 18, 2015. We are losing potential cures when we lose biodiversity of plants. Three measures we can use to describe spatial patterns of species richness. If species are mostly generalists, b-diversity is low. If species are mostly specialists, b-diversity is high. Tourism directed toward exotic, often threatened, natural environments. 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. De(cid:272)reased (cid:271)iodiversity redu(cid:272)es (cid:374)atural syste(cid:373)"s a(cid:271)ility to fu(cid:374)(cid:272)tio(cid:374) a(cid:374)d provide servi(cid:272)es. A-diversity (alpha) = number of species in local area of homogeneous (like; the same) habitat. Y-diversity (gamma) = number of species in large geographic area that comprises many habitats. B-diversity (beta) = turnover in species from one local area to another. Do you (cid:373)ake several s(cid:373)all reserves or (cid:271)igger (cid:271)ut less a(cid:373)ou(cid:374)ts of reserves? (cid:863) When b-diversity is high, (cid:272)o(cid:374)servatio(cid:374) (cid:373)a(cid:374)agers go to (cid:862)several s(cid:373)all(cid:863) desig(cid:374).
