Bio 3115 universit dottawa university of ottawa m77

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Unformatted text preview: Ottawa / University of Ottawa M7.7 BIO 3115 Conservation Biology BIO 3115 Université d’Ottawa / University of Ottawa Global patterns of decline 1952 1964 1958 1980 BIO 3115 Université d’Ottawa / University of Ottawa M7.8 BIO 3115 Conservation Biology Conclusion Almost all top predatory fish species that are subject to commercial exploitation are being overexploited. As of 2003, the world’s oceans had lost an estimated 90% of large predatory fish biomass. What are the ecosystemic effects of “fishing down the food chain”? BIO 3115 Université d’Ottawa / University of Ottawa MB1 Can marine fisheries recover? Population decline and subsequent population size for 90 marine fish stocks. The ordinate refers to the size of a population 5 years after the proportionately largest 15-year decline experienced by that population, relative to its size at the beginning of its 15-year decline. M7.18 BIO 3115 Université d’Ottawa / University of Ottawa 2012 M7.9 Slide 18 MB1 A lot of populations have fishing pressure removed but still keep declining. This means that...
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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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