Helgoland Roads, North Sea: 45 Years of Change

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From: Estuaries and Coasts(Vol. 33, Issue 2)
Publisher: Springer
Document Type: Report
Length: 335 words

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Byline: Karen Helen Wiltshire (1,2), Alexandra Kraberg (1), Inka Bartsch (3), Maarten Boersma (1), Heinz-Dieter Franke (1), Jan Freund (4), Christina Gebuhr (1), Gunnar Gerdts (1), Karina Stockmann (5), Antje Wichels (1) Keywords: Plankton; Macrobenthos; Bacteria; Nutrients; North Sea; Climate change Abstract: The Helgoland Roads time series is one of the richest temporal marine data sets available. Running since 1962, it documents changes for phytoplankton, salinity, Secchi disc depths and macronutrients. Uniquely, the data have been carefully quality controlled and linked to relevant meta-data, and the pelagic time series is further augmented by zooplankton, intertidal macroalgae, macro-zoobenthos and bacterioplankton data. Data analyses have shown changes in hydrography and biota around Helgoland. In the late 1970s, water inflows from the south-west to the German Bight increased with a corresponding increase in flushing rates. Salinity and annual mean temperature have also increased since 1962 and the latter by an average of 1.67degC. This has influenced seasonal phytoplankton growth causing significant shifts in diatom densities and the numbers of large diatoms (e. g. Coscinodiscus wailesii). Changes in zooplankton diversity have included the appearance of the ctenophore Mnemiopsis leidyi. The macroalgal community also showed an increase in green algal and a decrease in brown algal species after 1959. Over 30 benthic macrofaunal species have been newly recorded at Helgoland over the last 20 years, with a distinct shift towards southern species. These detailed data provide the basis for long-term analyses of changes on many trophic levels at Helgoland Roads. Author Affiliation: (1) Biologische Anstalt Helgoland, Alfred Wegener Institute for Polar and Marine Research, P.O. Box 180, 27483, Helgoland, Germany (2) School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany (3) Alfred Wegener Institute for Polar and Marine Research, P.O. Box 12 01 61, 27515, Bremerhaven, Germany (4) ICBM, University of Oldenburg, P.O. Box 2503, 26111, Oldenburg, Germany (5) Institute for Coastal Research, GKSS Research Centre, Max-Planck-Strasse 1, 21502, Geesthacht, Germany Article History: Registration Date: 29/09/2009 Received Date: 07/10/2008 Accepted Date: 27/09/2009 Online Date: 25/11/2009

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Gale Document Number: GALE|A231547528