Contemporary life history characteristics of Lake Superior deepwater ciscoes

Autor:	S. C. Chong, T. C. Pratt
Rok vydání:	2012
Předmět:	Ecology biology Contemporary life Coregonus hoyi Abundance (ecology) Survivorship curve Fauna Fish Management Monitoring Policy and Law Aquatic Science biology.organism_classification Sex ratio
Zdroj:	Aquatic Ecosystem Health & Management. 15:322-332
ISSN:	1539-4077 1463-4988
DOI:	10.1080/14634988.2012.708639
Popis:	The diversity and abundance of ciscoes has declined in the Great Lakes, with only Lake Superior retaining its original Cisco fauna; yet as a group, ciscoes remain poorly studied. We examined age and growth, sex ratios, and estimated survivorship and mortality of deepwater ciscoes (Bloater: Coregonus hoyi, Kiyi: C. kiyi, and Shortjaw Cisco: C. zenithicus) and Cisco C. artedi. All fish were captured in gill nets set >60 m in Canadian waters of Lake Superior from 2007–2009. Survivorship was higher than expected, with total annual survival rates ranging from 0.615 (Kiyi) to 0.785 (Shortjaw Cisco). This result was attributed to using otoliths to estimate ages rather than scales as done in previous investigations. Maximum ages of ciscoes exceeded 20 years with Cisco, the largest, longest-lived species, followed by Shortjaw Cisco, Bloater and Kiyi. Females dominated adult populations in all species; females were larger-at-age and had greater longevity, resulting in sex ratios skewed heavily towards females. With the exception of age and growth data, the life history characteristics that we observed were consistent with historic data from the early part of the 20th century.
Databáze:	OpenAIRE
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