caa a22 4500 47711587X CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00005221 doi (NATIONALLICENCE)springer-10.1007/BF00005221 Why do juvenile fourhorn sculpin, Triglopsis quadricornis , appear in the pelagic habitat at night? [Elektronische Daten] [Johan Hammar, Eva Bergstrand, Olof Enderlein] 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. Kluwer Academic Publishers, 1996 Myoxocephalus quadricornis nationallicence Glacial relicts nationallicence Migratory behavior nationallicence Feeding nationallicence Benthos nationallicence Temperature nationallicence Thermotaxis nationallicence Lake Vättern nationallicence Sweden nationallicence Hammar Johan Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut Bergstrand Eva Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut Enderlein Olof Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 185-195 0378-1909 46:2<185 1996 46 10641 https://doi.org/10.1007/BF00005221 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005221 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hammar Johan Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut NATIONALLICENCE 700 1- Bergstrand Eva Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut NATIONALLICENCE 700 1- Enderlein Olof Institute of Freshwater Research, S-178 93, Drottningholm, Sweden aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 185-195 0378-1909 46:2<185 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer