Seasonal bottlenecks in diet shifts and growth of smelt in a large eutrophic lake
Identifieur interne : 000993 ( Main/Exploration ); précédent : 000992; suivant : 000994Seasonal bottlenecks in diet shifts and growth of smelt in a large eutrophic lake
Auteurs : M. Vinni [Finlande] ; J. Lappalainen [Finlande] ; T. Malinen [Finlande] ; H. Peltonen [Finlande]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2004-02.
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Abstract
Seasonal growth of smelt Osmerus eperlanus was studied in the Kiihkelyksenselkä basin in the eutrophic Lake Hiidenvesi, southern Finland. The growth of age 1+ and 2+ year smelts was very low probably due to the discontinuous supply of large invertebrates Chaoborus flavicans and Mysis relicta. Diet shift back to zooplankton in autumn, suggested the existence of a bottleneck in the growth of these age groups. Slow growth rate was further intensified by the onset of maturity at age 2 years, combined with the high diet and habitat overlaps between similar‐sized 1+ and 2+ year smelts. Older 3+ and 4+ year smelts shifted to piscivory, i.e. cannibalism, during the growing season, which was seen as rapid increases in their growth rates.
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DOI: 10.1111/j.0022-1112.2004.00323.x
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The growth of age 1+ and 2+ year smelts was very low probably due to the discontinuous supply of large invertebrates Chaoborus flavicans and Mysis relicta. Diet shift back to zooplankton in autumn, suggested the existence of a bottleneck in the growth of these age groups. Slow growth rate was further intensified by the onset of maturity at age 2 years, combined with the high diet and habitat overlaps between similar‐sized 1+ and 2+ year smelts. Older 3+ and 4+ year smelts shifted to piscivory, i.e. cannibalism, during the growing season, which was seen as rapid increases in their growth rates.</div></front></TEI><affiliations><list><country><li>Finlande</li></country><region><li>Uusimaa</li></region><settlement><li>Helsinki</li></settlement><orgName><li>Université d'Helsinki</li></orgName></list><tree><country name="Finlande"><region name="Uusimaa"><name sortKey="Vinni, M" sort="Vinni, M" uniqKey="Vinni M" first="M." last="Vinni">M. 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