Download e-book for iPad: Boreal Shield Watersheds: Lake Trout Ecosystems in a by John Gunn, Robert John Steedman, Richard Ryder

By John Gunn, Robert John Steedman, Richard Ryder

ISBN-10: 020349508X

ISBN-13: 9780203495087

ISBN-10: 1566706467

ISBN-13: 9781566706469

Boreal guard Watersheds: Lake Trout Ecosystems in a altering surroundings brings jointly the paintings of a well known foreign team of scientists who specialise in aquatic technological know-how and environmental administration. They discover the functioning of Boreal defend ecosystems, concentrating on the lake trout, the vintage coldwater species of northern glaciated lakes, utilizing it as a hallmark of environmental switch and as a version to degree the effectiveness of administration activities. This publication demonstrates how boreal waters have served as a crucible for many years of environmental study into the affects of nutrient additions, hint contaminants, acid rain, weather swap, activity fishing, invasive species, and watershed disturbances.The textual content builds in this tremendous examine legacy and explores our skill to regulate human interactions with ecosystems around the large Boreal protect ecozone of North the US, and with different very important ecosystems around the world. It additionally presents versions and new equipment of assessing the danger to and the sturdiness of ecosystems in terms of neighborhood, local, and international human actions. Maps and outlines of numerous very important long term tracking websites and an atlas describing greater than 3,000 lake trout lakes within the sector are particular elements of the publication.

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Additional info for Boreal Shield Watersheds: Lake Trout Ecosystems in a Changing Environment

Sample text

3). Populations in Quebec, eastern Ontario, the maritime provinces, and New England were primarily colonized by lake trout from an Atlantic refuge, with some Atlantic fish reaching as far west as Lake Superior and Lake Nipigon. 2 Simplified cladogram showing S. namaycush mitochondrial DNA lineages (A–D) detected by Wilson and Hebert (1996, 1998) and their association with glacial refugia during the most recent glaciation. Branch lengths are not proportional to genetic divergence among lineages.

4). Ironically, the “glacial relict” populations of lake trout identified by Ihssen et al. near Haliburton, Ontario appear to be isolated descendants of Mississippian fish that did not come into contact with lake trout from other refugia (Wilson and Hebert, 1996), probably because of the brief time window for colonization as the glaciers retreated (Mandrak and Crossman, 1992). Genetic structure of modern populations Although historical events played a major role in structuring the genetic and phenotypic diversity of lake trout, populations in southern Shield habitats have been adapting to local conditions for over a thousand generations and now reflect the joint influence of historical and ecological factors.

Colonization of the study area by lake trout with Mississippian and Atlantic origins occurred initially through glacial lakes in the lower Great Lakes basin, roughly 14,000 to 13,500 years ago (Wilson and Hebert, 1996). Although dispersal from the Atlantic refuge may have been hindered by the Champlain Sea, eastern lake trout were probably able to effectively colonize southern Shield lakes by 10,000 years ago (Wilson and Hebert, 1996). 4). Lake trout from these western refugia did not reach the Canadian Shield until 9500 years ago (Wilson and Hebert, 1996).

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Boreal Shield Watersheds: Lake Trout Ecosystems in a Changing Environment by John Gunn, Robert John Steedman, Richard Ryder

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