By John C. Avise (auth.), John C. Avise, James L. Hamrick (eds.)
This quantity explores the relevance of genetics for the conservation of species, groups, and ecosystems, emphasizing real case histories.
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Extra info for Conservation Genetics: Case Histories from Nature
Sample text
However, whaling never actually stopped. IWC member nations have continued to hunt some species of whales for scientific research or for aboriginal and subsistence use. , 1991) can legally be sold to consumers, thereby sustaining a commercial market for meat, skin, blubber, and other whale products. When some species are protected by an international prohibition against hunting but similar species are not, it is crucial to identify the origin of products that are actually sold in retail markets.
5). S. Atlantic coast included at least 750 dolphins-about 500/0 of the known coastal population (Harwood and Hall, 1990)! The proximate cause of these deaths remains controversial, but has been attributed to dinoflagellate toxins (Hansen, 1992). S. 4). Genetic studies of bottlenose dolphins are now providing this required evidence of population structure. Clear differentiation of mtDNA haplotypes exists between populations in the Gulf of Mexico and the Atlantic coast (Dowling and ~rown, 1993), and perhaps between even localized groups separated by less than 20 km (Duffield and Wells, 1991).
Regardless of the specific processes underlying the observed pattern of non-random mortality, these results point to a surprising degree of fme-scale genetic differentiation among whale populations. migrate to discrete wintering grounds along continental and insular coastlines or over shallow submerged banks in tropical latitudes. Unlike Northern Hemisphere stocks that may represent congregations of seasonally distinct subpopulation units, Southern Hemisphere stocks are thought to remain segregated year-round, migrating between wintering and summering grounds as individual units.