23 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: rsity of Ottawa The unintentional harvest of organisms as a consequence of human recreational, economic or recreational activities, e.g. migratory songbird mortality from skyscrapers, road kill, manatee mortality from power boats. 2012 Indirect exploitation M7.24 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M7.12 BIO 3115 Conservation Biology Sturgeon M7.25 BIO 3115 Université d’Ottawa / University of Ottawa 2012 Exploitation represents an additional source of mortality. If there is not compensatory increases in fecundity, population growth rates decline, which may lead to reductions in population size. E.g. decline in sturgeon catch per unit effort in the lower Saskatchewan River indicated a dramatic reduction in stock size. Annual sturgeon CPUE (kg/licence) Consequences of exploitation I: reductions in population size 150 The Pas 120 A Cumberland House 90 60 30 0 75 80 85 90 95 Year (1900) M7.26 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M7.13 BIO 3115 Conservation Biology Consequences of exp...
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