Disc6 bio 2b - Ecological and evolutionary consequences of...

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Ecological and evolutionary consequences of human activities Humans as the ultimate top predators
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Trophy fishing (1950-2009)
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Reverse evolution In a review of 34 studies that tracked 29 species across 40 different geographic systems, harvested and hunted populations are on average 20 percent smaller in body size than previous generations, and the age at which they first reproduce is on average 25 percent earlier. Harvested organisms are the fastest-changing organisms of their kind in the wild, likely because we take such high proportions of a population and target the largest Taking a K-selected species and making in more r-selected
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Decline of global fisheries over the past 50 years # of collapsed fisheries = # at < 10% of historical maximum
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Atlantic Cod: A case study of “the fish that changed the world”
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Atlantic Cod: portrait of overexploitation: Why doesn’t the stock recover, even when fishing is stopped altogether? Small-scale inshore fisheries Seasonal fleets Offshore bottom trawlers Interntl. quotas; Canada EEZ Moratorium declared Fishery closed indefinitely Canadian landings of Cod (1850-present) Moratorium declared 1992
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This note was uploaded on 11/29/2010 for the course BIOLOGY 1211 taught by Professor Patricelli during the Spring '10 term at UC Davis.

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Disc6 bio 2b - Ecological and evolutionary consequences of...

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