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Effects of physical factors on the vertical distribution of larval walleye pollock Theragra chalcogramma under controlled laboratory conditions

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dc.creator Olla, Bori L.
dc.creator Davis, Michael W.
dc.date.accessioned 2011-12-20T17:59:54Z
dc.date.available 2011-12-20T17:59:54Z
dc.date.issued 1990-05-29
dc.identifier.citation Olla, B. L., & Davis, M. W. (1990, May 29). Effects of physical factors on the vertical distribution of larval walleye pollock Theragra chalcogramma under controlled laboratory conditions. Marine Ecology Progress Series, 63, 105-112. en_US
dc.identifier.uri http://hdl.handle.net/1957/26243
dc.description The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/ en_US
dc.description.abstract This study examined, under controlled laboratory conditions, behavioral responses of larval walleye pollock (4 to 8 mm) to various physical factors that may potentially play a role in vertical movements and distribution. Diel periodicity in vertical distribution was evident and appeared to be under exogenous control. During the day, with light intensity at 70 μE/m⁻²s⁻¹, larvae moved downward from the surface. As light intensity decreased during simulated evening twilight, larvae moved upward. At night, with no available light, larvae continued to swim upward, apparently the result of negative geotaxis. They remained near the surface until morning when they then began moving downward. Changes in vertical distribution occurred concomitantly with changes in activity, orientation and behavior. Formation of a vertical thermal gradient caused larvae to move upward and away from cold water. Turbulence at the surface, induced by an airstream, elicited an avoidance response and resulted in larvae moving downward. en_US
dc.language.iso en_US en_US
dc.publisher Inter-Research en_US
dc.relation.ispartofseries Marine Ecology Progress Series en_US
dc.relation.ispartofseries Vol. 63 (1990) en_US
dc.subject Theragra chalcogramma en_US
dc.subject vertical migrations en_US
dc.subject light intensity en_US
dc.subject diel periodicity en_US
dc.title Effects of physical factors on the vertical distribution of larval walleye pollock Theragra chalcogramma under controlled laboratory conditions en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.3354/meps063105


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