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Periodic changes in the zooplankton of the North Sea during the twentieth century linked to oceanic inflow Reid, Ph.C.; Edwards, M.; Beaugrand, G.; Skogen, M.D.; Stevens, D. (2003). Periodic changes in the zooplankton of the North Sea during the twentieth century linked to oceanic inflow. Fish. Oceanogr. 12(4-5): 260-269. https://dx.doi.org/10.1046/j.1365-2419.2003.00252.x In: Fisheries Oceanography. Blackwell Science: Oxford. ISSN 1054-6006; e-ISSN 1365-2419, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 101433 [ download pdf ]

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Trefwoorden

Aquatic communities > Plankton > Zooplankton Atmospheric forcing Fisheries Calanus finmarchicus (Gunnerus, 1770) [WoRMS]; Calanus helgolandicus (Claus, 1863) [WoRMS] ANE, Noordzee [Marine Regions] Marien/Kust

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Reid, Ph.C., meer Edwards, M., meer Beaugrand, G., meer	Skogen, M.D. Stevens, D., meer

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Abstract

Oceanic inflow is estimated to contribute more than 90% of the nutrient input into the North Sea. Variability in the volume, chemical properties, biological content and source of the inflowing water is thus likely to have a considerable effect on North Sea ecosystems. Changes seen in the plankton, and in particular Calanus finmarchicus and Calanus helgolandicus, over the last 40 years as measured by the Continuous Plankton Recorder survey, allow clear periods to be identified that appear to be associated with variability in inflow. Monthly estimates of inflow and outflow across a section between Orkney and Utsira in Norway as well as netflow (sum of Baltic outflow, runoff and Channel inflow), have been derived from runs of the NORWECOM model for two integrated depth intervals: surface to 150 m and >150 m. A comparison is made between the physical model output and plankton results for the period 1958-99. Distinct plankton periods that appear to reflect changing inflow events are discussed in relation to hydrometeorological and earlier plankton studies over approximately the last 100 years.

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