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    Increasing Thiamine Concentrations in Lake Trout Eggs from Lakes Huron and Michigan Coincide with Low Alewife Abundance

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    Author
    Riley, Stephen C.
    Rinchard, Jacques
    Honeyfield, Dale C.
    Evans, Allison N.
    Begnoche, Linda
    Keyword
    Thiamine Concentration
    Alewife
    Lake Trout
    Great Lakes
    Journal title
    North American Journal of Fisheries Management
    Date Published
    2011-12-14
    Publication Volume
    31
    Publication Issue
    6
    
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    URI
    http://hdl.handle.net/20.500.12648/2286
    Abstract
    Lake trout Salvelinus namaycush in the Laurentian Great Lakes suffer from thiamine deficiency as a result of adult lake trout consuming prey containing thiaminase, a thiamine-degrading enzyme. Sufficiently low egg thiamine concentrations result in direct mortality of or sublethal effects on newly hatched lake trout fry. To determine the prevalence and severity of low thiamine in lake trout eggs, we monitored thiamine concentrations in lake trout eggs from 15 sites in Lakes Huron and Michigan from 2001 to 2009. Lake trout egg thiamine concentrations at most sites in both lakes were initially low and increased over time at 11 of 15 sites, and the proportion of females with egg thiamine concentrations lower than the recommended management objective of 4 nmol/g decreased over time at eight sites. Egg thiamine concentrations at five of six sites in Lakes Huron and Michigan were significantly inversely related to site-specific estimates of mean abundance of alewives Alosa pseudoharengus, and successful natural reproduction of lake trout has been observed in Lake Huron since the alewife population crashed. These results support the hypothesis that low egg thiamine in Great Lakes lake trout is associated with increased alewife abundance and that low alewife abundance may currently be a prerequisite for successful reproduction by lake trout in the Great Lakes.
    Citation
    Riley, C.S., Rinchard, J., Honeyfield, D.C., Evans, A.N. and Begnoche, L., 2011. Increasing thiamine levels in lake trout eggs from lakes Huron and Michigan coincide with low alewife abundance. North American Journal of Fisheries Management , 31, 1052-1064
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