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Widespread changes in growth, diet a...

Fera, Shannon A.

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Widespread changes in growth, diet and depth distribution of lake whitefish (coregonus clupeaformis) in the great lakes are linked to invasive dreissenid mussels.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Widespread changes in growth, diet and depth distribution of lake whitefish (coregonus clupeaformis) in the great lakes are linked to invasive dreissenid mussels./
作者:	Fera, Shannon A.
面頁冊數:	134 p.
附註:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MR87321
ISBN:	9780494873212

Widespread changes in growth, diet and depth distribution of lake whitefish (coregonus clupeaformis) in the great lakes are linked to invasive dreissenid mussels.
Fera, Shannon A.

Widespread changes in growth, diet and depth distribution of lake whitefish (coregonus clupeaformis) in the great lakes are linked to invasive dreissenid mussels. - 134 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--Trent University (Canada), 2014.

This item must not be sold to any third party vendors.

Recent declines in growth and condition of Great Lakes' lake whitefish (Coregonus clupeaformis) have been linked to ecosystem-wide changes stemming from the invasion of dreissenid mussels. To test the influence of invasive mussels on this commercially important coregonid species, we collected archived scale samples from ten Great Lake locations and analyzed long-term changes in growth rates, delta 13C and delta 15N stable isotope ratios before and after mussel establishment. There was a decrease in pre-maturation growth after establishment in all four locations where we examined back-calculated growths. In six of the seven locations with dreissenid populations, a significant increase in delta 13C and a significant decrease in delta 15N was found. In dreissenid-absent locations of Lake Superior, we did not see changes in growth or isotope ratios indicative of a major regime shift. Observed shifts in isotopic signatures provide evidence for an increased reliance on nearshore food sources and shallower depth distribution as a result of dreissenids, which likely contributed to lowered growth of lake whitefish.

ISBN: 9780494873212Subjects--Topical Terms:

516476
Ecology.

Widespread changes in growth, diet and depth distribution of lake whitefish (coregonus clupeaformis) in the great lakes are linked to invasive dreissenid mussels.
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500 $a Source: Masters Abstracts International, Volume: 52-03.
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520 $a Recent declines in growth and condition of Great Lakes' lake whitefish (Coregonus clupeaformis) have been linked to ecosystem-wide changes stemming from the invasion of dreissenid mussels. To test the influence of invasive mussels on this commercially important coregonid species, we collected archived scale samples from ten Great Lake locations and analyzed long-term changes in growth rates, delta 13C and delta 15N stable isotope ratios before and after mussel establishment. There was a decrease in pre-maturation growth after establishment in all four locations where we examined back-calculated growths. In six of the seven locations with dreissenid populations, a significant increase in delta 13C and a significant decrease in delta 15N was found. In dreissenid-absent locations of Lake Superior, we did not see changes in growth or isotope ratios indicative of a major regime shift. Observed shifts in isotopic signatures provide evidence for an increased reliance on nearshore food sources and shallower depth distribution as a result of dreissenids, which likely contributed to lowered growth of lake whitefish.
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