Why do juvenile fourhorn sculpin, Triglopsis quadricornis , appear in the pelagic habitat at night?
Identifieur interne : 001085 ( Main/Exploration ); précédent : 001084; suivant : 001086Why do juvenile fourhorn sculpin, Triglopsis quadricornis , appear in the pelagic habitat at night?
Auteurs : Johan Hammar [Suède] ; Eva Bergstrand [Suède] ; Olof Enderlein [Suède]Source :
- Environmental Biology of Fishes [ 0378-1909 ] ; 1996-06-01.
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- geographic : Suède.
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Abstract
Synopsis: Challenging the generally accepted view of the fourhorn sculpin Triglopsis quadricornis as a cold-stenothermal and true benthic species, novel findings of juveniles in the pelagic habitat of Lake Vättern, Sweden, have been examined and critically evaluated. Young-of-the-year and small-sized, sexually mature individuals, ranging 27–45 and 82–110 mm in total length, were recorded in nocturnal trawl catches from pelagic midwater in August. The sculpin had fed extensively on both benthic and semi-pelagic crustaceans, including large cyclopoid copepods, Mysis relicta, Pallasea quadrispinosa, Monoporeia affinis, Gammaracanthus lacustris, and Saduria entomon. Based on an extensive literature review a series of ecological and evolutionary reasons for a pelagic behavior of this profundal coldwater fish is suggested. Nocturnal, semi-pelagic feeding, and consecutive, thermotactic, vertical migrations up in midwater as shown by Wurtsbaugh & Neverman (1988) in order to maximize energy intake after feeding, are possible adaptations of these juvenile sculpin for minimizing size-dependent mortality due to intra- and interspecific predation and competition from other deepwater fishes.
Url:
DOI: 10.1007/BF00005221
Affiliations:
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Young-of-the-year and small-sized, sexually mature individuals, ranging 27–45 and 82–110 mm in total length, were recorded in nocturnal trawl catches from pelagic midwater in August. The sculpin had fed extensively on both benthic and semi-pelagic crustaceans, including large cyclopoid copepods, Mysis relicta, Pallasea quadrispinosa, Monoporeia affinis, Gammaracanthus lacustris, and Saduria entomon. Based on an extensive literature review a series of ecological and evolutionary reasons for a pelagic behavior of this profundal coldwater fish is suggested. Nocturnal, semi-pelagic feeding, and consecutive, thermotactic, vertical migrations up in midwater as shown by Wurtsbaugh & Neverman (1988) in order to maximize energy intake after feeding, are possible adaptations of these juvenile sculpin for minimizing size-dependent mortality due to intra- and interspecific predation and competition from other deepwater fishes.</div></front></TEI><affiliations><list><country><li>Suède</li></country><region><li>Svealand</li></region><settlement><li>Stockholm</li></settlement></list><tree><country name="Suède"><noRegion><name sortKey="Hammar, Johan" sort="Hammar, Johan" uniqKey="Hammar J" first="Johan" last="Hammar">Johan Hammar</name></noRegion><name sortKey="Bergstrand, Eva" sort="Bergstrand, Eva" uniqKey="Bergstrand E" first="Eva" last="Bergstrand">Eva Bergstrand</name><name sortKey="Enderlein, Olof" sort="Enderlein, Olof" uniqKey="Enderlein O" first="Olof" last="Enderlein">Olof Enderlein</name><name sortKey="Enderlein, Olof" sort="Enderlein, Olof" uniqKey="Enderlein O" first="Olof" last="Enderlein">Olof Enderlein</name><name sortKey="Hammar, Johan" sort="Hammar, Johan" uniqKey="Hammar J" first="Johan" last="Hammar">Johan Hammar</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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