Salmonid diet and the size, distribution, and density of benthic invertebrates in an arctic lake
Identifieur interne : 001549 ( Main/Exploration ); précédent : 001548; suivant : 001550Salmonid diet and the size, distribution, and density of benthic invertebrates in an arctic lake
Auteurs : W. Merrick [États-Unis] ; E. Hershey [États-Unis] ; E. Mcdonald [États-Unis]Source :
- Hydrobiologia [ 0018-8158 ] ; 1992-09-01.
English descriptors
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Abstract
Abstract: Size selective predation on molluscs was apparent for lake trout (Salvelinus namaycush) and round whitefish (Prosopium cylindraceum), but not for arctic grayling (Thymallus arcticus), in the Toolik Lake region of arctic Alaska during the summer of 1986. Lake trout consumed significantly larger molluscs of all taxa than did round whitefish, and selected larger molluscs than were available on either rocky or soft-sediment habitats. Round whitefish were not size-selective on the snail Lymnaea, but were size-selective on the snail Valvata and on clams from the soft sediments. Round whitefish consumed fewer and smaller Lymnaea compared to lake trout. Because lake trout ate more Lymnaea and also tended to select larger, reproductive-sized individuals, this fish could potentially have a more detrimental impact on the Lymnaea population. Finally, differences in Lymnaea densities and size distributions between lakes with and without lake trout suggest that these fish may be responsible for the pattern of distribution, size, and density observed for Lymnaea in Toolik Lake and other area lakes.
Url:
DOI: 10.1007/BF00013464
Affiliations:
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Mcdonald</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Chemical Engineering, University of Minnesota/Duluth, 55812, Duluth, MN</wicri:regionArea><placeName><region type="state">Minnesota</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Hydrobiologia</title><title level="j" type="sub">The International Journal of Aquatic Sciences</title><title level="j" type="abbrev">Hydrobiologia</title><idno type="ISSN">0018-8158</idno><idno type="eISSN">1573-5117</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1992-09-01">1992-09-01</date><biblScope unit="volume">240</biblScope><biblScope unit="issue">1-3</biblScope><biblScope unit="page" from="225">225</biblScope><biblScope unit="page" to="233">233</biblScope></imprint><idno type="ISSN">0018-8158</idno></series><idno type="istex">CCFEFB8D2D71838692EB64C4EBD2272AEF9F7652</idno><idno type="DOI">10.1007/BF00013464</idno><idno type="ArticleID">Art19</idno><idno type="ArticleID">BF00013464</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0018-8158</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>arctic</term><term>benthic</term><term>lake trout</term><term>predation</term><term>snails</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Size selective predation on molluscs was apparent for lake trout (Salvelinus namaycush) and round whitefish (Prosopium cylindraceum), but not for arctic grayling (Thymallus arcticus), in the Toolik Lake region of arctic Alaska during the summer of 1986. Lake trout consumed significantly larger molluscs of all taxa than did round whitefish, and selected larger molluscs than were available on either rocky or soft-sediment habitats. Round whitefish were not size-selective on the snail Lymnaea, but were size-selective on the snail Valvata and on clams from the soft sediments. Round whitefish consumed fewer and smaller Lymnaea compared to lake trout. Because lake trout ate more Lymnaea and also tended to select larger, reproductive-sized individuals, this fish could potentially have a more detrimental impact on the Lymnaea population. Finally, differences in Lymnaea densities and size distributions between lakes with and without lake trout suggest that these fish may be responsible for the pattern of distribution, size, and density observed for Lymnaea in Toolik Lake and other area lakes.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Minnesota</li></region></list><tree><country name="États-Unis"><region name="Minnesota"><name sortKey="Merrick, W" sort="Merrick, W" uniqKey="Merrick W" first="W." last="Merrick">W. Merrick</name></region><name sortKey="Hershey, E" sort="Hershey, E" uniqKey="Hershey E" first="E." last="Hershey">E. Hershey</name><name sortKey="Mcdonald, E" sort="Mcdonald, E" uniqKey="Mcdonald E" first="E." last="Mcdonald">E. Mcdonald</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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