Lecture37_ConservationBio

Lecture37_ConservationBio - • • • 2 Genetic and...

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Conservation Biology I. Why are species going extinct? From 1600-1950, most extinctions occurred on Current data (species native to Canada) A. Habitat loss due to deforestation Tropical forests: less than % of Earth's land area, but > FAO data 11/05: Globally, in 1990s: Net loss of ~ M ha/yr (WA state has M ha), or loss of %/yr Tropics, in 1990s: Net loss of M ha/yr, or loss of %/yr Globally, 2000-2005: Net loss of ~ M ha/yr (area the size of km 2 /day) Primary forest loss = M ha/yr Conclude:
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B. Habitat loss: using species area curves to quantify the impact on biodiversity log-log plot; S = # of c = a constant that scales the data A = z = Islands: z is Continents: z is C. Habitat fragmentation Example 1: Example 2: What happens to habitats when they are (permanently) fragmented? 1. Habitat quality (especially along edges)
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Unformatted text preview: • • • 2. Genetic and demographic effects on populations that occupy fragments II. Evolutionary & ecological issues in conservation Genetic issues: 1) 2) Case history #1: Bighorn sheep in Montana: λ declined in a small, isolated population: Case history #2: Glanville fritillaries Recall: many small, isolated populations in meadows with host plant 1. Quantify degree of homozygosity in several populations 2. Quantify likelihood that inbred populations go extinct. Predict: Result: B. Demographic issues in small populations Why are small populations likely to go extinct, in addition to genetic problems? 1) Susceptibility to catastrophes or bad years 2) Sex ratio or mating problems Issues from this course that affect your life and the future: • • • • • • •...
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Lecture37_ConservationBio - • • • 2 Genetic and...

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