The vertical distribution of zooplankton in the western Irish Sea |
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| Authors: | Sherard Scrope-Howe David A. Jones |
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| Affiliation: | 1. Aquatic Ecology Group, Ludwig Maximilian University of Munich (LMU), Grosshadernerstr. 2, 82152 Planegg-Martinsried, Germany;2. Faculty of Biosciences and Aquaculture, University of Nordland, N-8049 Bodø, Norway;1. Tvärminne Zoological Station, University of Helsinki, 10900 Hanko, Finland;2. Natural Environment Centre, Finnish Environment Institute (SYKE), 90570 Oulu, Finland;3. International Council for the Exploration of the Sea (ICES), 1553 Copenhagen, Denmark;4. Marine Research Centre, Finnish Environment Institute (SYKE), 00251 Helsinki, Finland |
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| Abstract: | Zooplankton diel vertical migration is evident on the mixed isothermal side of the western Irish Sea frontal system but is often influenced by large tides and persistent geostrophic currents. On the stratified side of the front, temperature acts as a controlling factor with most of the zooplankton occurring above the thermocline and carrying out pronounced vertical migration when chlorophyll a levels are low and diffuse. At higher chlorophyll levels, when discrete chlorophyll a maxima form, zooplankton vertical movement may be greatly modified with a large number of species and stages concentrating within these maxima at all times of the diel light cycle. |
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| Keywords: | Zooplankton vertical migration chlorophyll distribution western Irish Sea |
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