Continuous plankton records stand the test of time: evaluation of flow rates, clogging and the continuity of the CPR time-series |
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| Authors: | John, Eurgain H. Batten, Sonia D. Stevens, Darren Walne, Anthony W. Jonas, Tanya Jonas Hays, Graeme C. |
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| Affiliation: | 2 School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea SA2 8pp and 1 Sir Alisterhardy Foundation for Ocean Science, The Laboratory, Citadel Hill, Plymouth PL1 2PB, UK |
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| Abstract: | The Continuous Plankton Recorder (CPR) survey is one of themost extensive biological time-series in existence and has beenin operation over major regions of the North Atlantic since1932. However, there is little information about the volumeof water filtered through each sample, but rather a generalassumption has persisted that each sample represents 3 m3. Datafrom electromagnetic flowmeters, deployed on CPRs between 1995and 1998, was examined. The mean volume filtered through sampleswas 3.11 m3 and the effect of clogging on filtration efficiencieswas not great. Consequently, even when the likely variationsin flow due to clogging are taken into account, previously identifiedlinks between zooplankton abundance and climatic signals remainstrong. |
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