Effects of Upwelling on Local Abundance and Distribution of Larval Alewife (Alosa pseudoharengus) in Eastern Lake Michigan

Autor:	George R. Heufelder, David J. Jude, Frank J. Tesar
Rok vydání:	1982
Předmět:	Fishery Intrusion Larva biology Abundance (ecology) Alosa pseudoharengus Upwelling Alewife Aquatic Science biology.organism_classification Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Fisheries and Aquatic Sciences. 39:1531-1537
ISSN:	1205-7533 0706-652X
DOI:	10.1139/f82-205
Popis:	Intrusion of cold (usually 3; when no upwelling occurred densities commonly exceeded 5000 larvae/1000 m3. Widespread distribution to depths of at least 15 m was found in the absence of upwelling, while during upwelling larvae were more concentrated in water ≤ 6 m deep. Additionally, at depths > 3 m during upwelling, alewife larvae were most abundant in bottom strata, a trend not observed in the absence of upwelling. Postulated mechanisms for reduced larval alewife abundance in inshore areas during upwelling include mortality of larvae due to thermal shock, and offshore or alongshore movement, either actively by larvae and potential spawning adults, or passively by larvae.Key words: Alosa pseudoharengus larvae, distribution, abundance, Lake Michigan, upwelling
Databáze:	OpenAIRE
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