BIO 1306 Lecture Notes - Lecture 20: Habitat Destruction, Local Extinction, Genetic Drift

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10 Mar 2018
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Chapter 56 - conservation biology + global change. Scientists know 1. 8 million species / we think there are 10-100m total and many are face extinction / Degradation is a major threat to biodiversity / dif cult to determine rate of destruction. Ot affects human welfare / bene ts us to maintain biodiversity / loss of species = loss of genes. Genetic how much genetic diversity you have within species between populations / can be reduced by genetic founder effect and bottleneck effect (don"t always lead to extinction) / higher diversity = more resilient to change. Threatened endangered extinction / at alarming rates. Diversity of different ecosystems on earth /local extinction of 1 ecosystem negative impact on others / web of life. Greatest treat / results from fragment and destruct: introducing species. May happen by accident or intentional / disrupt communities: overharvesting. Alteration: climate, atmosphere, ecosystems / ex: acid rain. 56. 2 population conservation (size, genetic diversity, and critical habitat)