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Life-history variation and managemen...

Swank, David Rollin.

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Life-history variation and management of wild Great Lakes steelhead populations.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Life-history variation and management of wild Great Lakes steelhead populations./
作者:	Swank, David Rollin.
面頁冊數:	192 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0631.
Contained By:	Dissertation Abstracts International66-02B.
標題:	Agriculture, Fisheries and Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3165786
ISBN:	054201047X

Life-history variation and management of wild Great Lakes steelhead populations.
Swank, David Rollin.

Life-history variation and management of wild Great Lakes steelhead populations. - 192 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0631.

Thesis (Ph.D.)--University of Michigan, 2005.

Steelhead (Oncorhynchus mykiss) were introduced to the Laurentian Great Lakes in the late 1880's, are reproducing successfully, and support valuable recreational fisheries, yet little is known about life-history variation among populations. To quantify and predict life-history trait variation among Great Lakes steelhead populations, and its implications for management, I analyzed data on steelhead life-history traits from the literature, and past and present scale samples collected from spawning runs in Great Lakes tributaries.

ISBN: 054201047XSubjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Life-history variation and management of wild Great Lakes steelhead populations.
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245 1 0 $a Life-history variation and management of wild Great Lakes steelhead populations.
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500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0631.
500 $a Chair: Edward S. Rutherford.
502 $a Thesis (Ph.D.)--University of Michigan, 2005.
520 $a Steelhead (Oncorhynchus mykiss) were introduced to the Laurentian Great Lakes in the late 1880's, are reproducing successfully, and support valuable recreational fisheries, yet little is known about life-history variation among populations. To quantify and predict life-history trait variation among Great Lakes steelhead populations, and its implications for management, I analyzed data on steelhead life-history traits from the literature, and past and present scale samples collected from spawning runs in Great Lakes tributaries.
520 $a Significant variation in life-history traits was found among populations both within and among Great Lakes. Hatchery steelhead from a single wild source stocked in different lakes had similar growth rates among lakes, but showed significant differences in age at maturity and adult mortality rate. Significant temporal variation in stream age structure, female age at maturity, and adult mortality was found within most steelhead populations. Female age at maturity was negatively correlated with adult mortality rate, as indexed by percent repeat spawners. The Black River steelhead population had significant changes in life-history traits related to a large decrease in sea lamprey predation since the 1950's.
520 $a I modeled steelhead smolt length as a tradeoff between juvenile growth and mortality in stream and lake habitats, and examined relationships between growth and mortality rates of juvenile steelhead, and stream age of adults. Instantaneous mortality rates of age-0 steelhead parr were significantly related to mean stream age of adults. Stream growth rates were significantly related to mean stream age of adult steelhead. The growth/mortality tradeoff model predicted an optimal smolt length much smaller than observed in Great Lakes populations.
520 $a I configured an age-structured population model on the Little Manistee River steelhead population to evaluate management recommendations for wild steelhead. Model simulations indicated fishing mortality changes in the stream fishery had a larger impact on percent repeat spawners than did equivalent changes in the lake fishery, while fishing mortality changes in the lake fishery had larger impacts on adult population size. Simulations of variable size and creel limits found size limits of 26--30 in., and a creel limit of 1/day produced significant reductions in harvest and increased population size.
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791 $a Ph.D.
792 $a 2005
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