103 extinction

103 extinction - OUTLINE EXTINCTION 1 EXTINCTION RATES 2...

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OUTLINE: EXTINCTION 1. EXTINCTION RATES. 2. DIFFICULT TO STUDY. 3. GENERAL CAUSES OF EXTINCTION. 4. EXAMPLE. Suggested reading: Primack, R. 2008. Primer of conservation biology. Sinauer Associates. Parejko, K. 2003. Pliny the Elder & first recorded extinction. Conservation Biology 17:925-927.
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DEFINITIONS GLOBAL EXTINCTION – PERMANENT LOSS THROUGHOUT RANGE. LOCAL EXTINCTION - LOSS FROM A REGION, BUT NOT EVERYWHERE Gray wolves are not globally endangered.
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EXTINCTION RATES HISTORICAL RATES (FROM FOSSIL RECORD): ______________________________. CURRENT RATES (FROM HABITAT AREA LOSS): ______________________________.
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EXTINCTION RATES THIS SUGGESTS: CURRENT EXTINCTION RATES ARE ABOUT ________ HIGHER THAN HISTORIC RATES. BIG NUMBER PROBLEM: ___________ _________________________________ _
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WHY IS EXTINCTION HARD TO STUDY? EXAMPLE: PASSENGER PIGEON
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SECOND EXAMPLE: GREAT AUK Coastal species related to puffins Flightless Used by fishermen for fresh food.
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ESTIMATING EXTINCTION NUMBER E.O. WILSON (ECOLOGIST WHO FIRST COINED TERM “BIODIVERSITY”) CALCULATED FROM OBSERVED RATE OF HABITAT LOSS & ECOLOGICAL THEORY OF ISLAND BIOGEOGRAPHY: _____________________ IN TROPICAL RAIN FOREST ALONE.
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GENERAL CAUSES 1. LOSS OF GENETIC VARIATION 2. DEMOGRAPHIC STOCHASTICITY
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