| Abstract: | We used growth and diet data from a fishery-independent survey of Chinook salmon Oncorhynchus tshawytscha, acoustic estimates of prey density and biomass, and statistical catch-at-age modeling to study the influence of the year-class strength of alewife Alosa pseudoharengus on the prey selection and abundance of age-1 Chinook salmon in Lake Michigan during the years 1992-1996 and 2001-2005. Alewives age 2 or younger were a large part of age-1 Chinook salmon diets but were not selectively fed upon by age-1 Chinook salmon in most years. Feeding by age-1 Chinook salmon on alewives age 2 or younger became selective as the biomass of alewives in that young age bracket increased, and age-1 Chinook salmon also fed selectively on young bloaters Coregonus hoyi when bloater density was high. Selection of older alewives decreased at high densities of alewives age 2 or younger and, in some cases, high densities of bloater. The weight and condition of age-1 Chinook salmon were not related to age-1 Chinook salmon abundance or prey abundance, but the abundance of age-1 Chinook salmon in year t was positively related to the density of age-0 alewives in year t - 1. Our results suggest that alewife year-class strength exerts a positive bottom-up influence on age-1 Chinook salmon abundance, prey switching behavior by young Chinook salmon contributing to the stability of the predator-prey relationship between Chinook salmon and alewives. ?? Copyright by the American Fisheries Society 2008. |
| Genre: | Article |
| ProdID: | 70033374 |
| Citation Author: | Warner, D. M.; Kiley, C. S.; Claramunt, R. M.; Clapp, D. F. |
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| Citation End Page: | 1700 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Transactions of the American Fisheries Society |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | The influence of alewife year-class strength on prey selection and abundance of age-1 Chinook salmon in Lake Michigan; 2008; Article; Journal; Transactions of the American Fisheries Society; Warner, D. M.; Kiley, C. S.; Claramunt, R. M.; Clapp, D. F. |
| Citation Start Page: | 1683 |
| Citation Volume: | 137 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | The influence of alewife year-class strength on prey selection and abundance of age-1 Chinook salmon in Lake Michigan; 2008; Article; Journal; Transactions of the American Fisheries Society; Warner, D. M.; Kiley, C. S.; Claramunt, R. M.; Clapp, D. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1577/T07-130.1 |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
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