38 bio 3115 universit dottawa university of ottawa

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Unformatted text preview: Annual sturgeon CPUE (kg/licence) Sturgeon stock decline in the lower Saskatchewan River 150 The Pas 120 A Cumberland House 90 60 30 0 75 80 85 90 95 Year (1900) M7.39 BIO 3115 Université d’Ottawa / University of Ottawa Tobin lake 3.5 3.4 10 Log stage Effects of dams on sturgeon habitat 2012 Dam construction resulted in significant loss of spawning habitat. Dam operations have reduced quality of spawning habitat through large diurnal changes in water level. 3.3 3.2 5.4120 5.4115 The Pas 5.4110 5.4105 5.4100 0 50 100 150 200 250 300 Hrs from 12:00 Am June 1, 1994 M7.40 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M7.20 BIO 3115 Conservation Biology Overexploitation resulted in modified age/size structure before dam construction Dam construction resulted in abrupt loss of large sturgeon and reduction in habitat quality/quantity and reduced carrying capacity. Exploitation continued at previous levels. Cumulative effects of habitat loss and exploitation resulted in stock collapse. Habitat loss Annual sturgeon CPUE (kg/licence) Cumulative effects on sturgeon Exploitation 150 A The Pas Cumberland House 120 90 60 30 0 75 80 85 90 95 Year (1900) M7.41 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M7.21...
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This document was uploaded on 03/11/2014 for the course BIO 3115 at University of Ottawa.

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