Distribution of Alewives in Southeastern Lake Ontario in Autumn and Winter: A Clue to Winter Mortalities
作者:
RogerA. Bergstedt,
Robert O'Gorman,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1989)
卷期:
Volume 118,
issue 6
页码: 687-692
ISSN:0002-8487
年代: 1989
DOI:10.1577/1548-8659(1989)118<0687:DOAISL>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
AlewivesAlosa pseudoharengusin the Great Lakes are thought to avoid extreme cold in winter by moving to deep water where the temperature is usually highest because of inverse thermal stratification. Information collected in Lake Ontario during autumn and winter 1981–1984 with an echo sounder and bottom and midwater trawls indicated that many alewives remained at depths above 110 m, regardless of water temperature. Alewives in the Great Lakes that did not descend to greater depths would be exposed to potentially lethal temperatures during cold winters.
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