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  • 1
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    The fate of an immigrant: Ensis directus in the eastern German Bight (2012)
    Springer
    In:  Helgoland Marine Research, 66 (3). pp. 307-317.
    Details
    Publication Date: 2019-09-23
    Description: We studied Ensis directus in the subtidal (7–16 m depth) of the eastern German Bight. The jack-knife clam that invaded in the German Bight in 1978 has all characteristics of a successful immigrant: Ensis directus has a high reproductive capacity (juveniles, July 2001: Amrumbank 1,914 m−2, Eiderstedt/Vogelsand: 11,638 m−2), short generation times and growths rapidly: maximum growth rates were higher than in former studies (mean: 3 mm month−1, 2nd year: up to 14 mm month−1). Ensis directus uses natural mechanisms for rapid dispersal, occurs gregariously and exhibits a wide environmental tolerance. However, optimal growth and population-structure annual gaps might be influenced by reduced salinity: at Vogelsand (transition area of Elbe river), maximum growth was lower (164 mm) than at the Eiderstedt site (outer range of Elbe river, L ∞ = 174 mm). Mass mortalities of the clams are probably caused by washout (video inspections), low winter temperature and strong storms. Ensis directus immigrated into the community finding its own habitat on mobile sands with strong tidal currents. Recent studies on E. directus found that the species neither suppresses native species nor takes over the position of an established one which backs up our study findings over rather short time scales. On the contrary, E. directus seems to favour the settlement of some deposit feeders. Dense clam mats might stabilise the sediment and function as a sediment-trap for organic matter. Ensis directus has neither become a nuisance to other species nor developed according to the ‘boom-and-bust’ theory. The fate of the immigrant E. directus rather is a story of a successful trans-ocean invasion which still holds on 23 years after the first findings in the outer elbe estuary off Vogelsand.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10152-011-0271-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Data integration for European marine biodiversity research: creating a database on benthos and plankton to study large-scale patterns and long-term changes (2010)
    Springer
    In:  Hydrobiologia, 644 (1). pp. 1-13.
    Details
    Publication Date: 2019-09-23
    Description: The general aim of setting up a central database on benthos and plankton was to integrate long-, medium- and short-term datasets on marine biodiversity. Such a database makes it possible to analyse species assemblages and their changes on spatial and temporal scales across Europe. Data collation lasted from early 2007 until August 2008, during which 67 datasets were collected covering three divergent habitats (rocky shores, soft bottoms and the pelagic environment). The database contains a total of 4,525 distinct taxa, 17,117 unique sampling locations and over 45,500 collected samples, representing almost 542,000 distribution records. The database geographically covers the North Sea (221,452 distribution records), the North-East Atlantic (98,796 distribution records) and furthermore the Baltic Sea, the Arctic and the Mediterranean. Data from 1858 to 2008 are presented in the database, with the longest time-series from the Baltic Sea soft bottom benthos. Each delivered dataset was subjected to certain quality control procedures, especially on the level of taxonomy. The standardisation procedure enables pan-European analyses without the hazard of taxonomic artefacts resulting from different determination skills. A case study on rocky shore and pelagic data in different geographical regions shows a general overestimation of biodiversity when making use of data before quality control compared to the same estimations after quality control. These results prove that the contribution of a misspelled name or the use of an obsolete synonym is comparable to the introduction of a rare species, having adverse effects on further diversity calculations. The quality checked data source is now ready to test geographical and temporal hypotheses on a large scale.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1007/s10750-010-0108-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Endogenous circatidal rhythm in the Manila clam Ruditapes philippinarum (Bivalvia: Veneridae) (1999)
    Springer
    In:  Marine Biology, 134 . pp. 107-112.
    Details
    Publication Date: 2018-06-07
    Description: Manila clams, Ruditapes philippinarum, removed from their natural environment and maintained for 9 weeks in continuously immersed conditions exhibited a clear endogenous circatidal rhythm in oxygen consumption. The clams exhibited a semidiurnal rhythmicity in oxygen consumption after showing a diurnal pattern in the first few days (5 to 7 d) of the experiment. The results of the present study indicate that activity rhythms of clams are controlled not only by exogenous factors, but also by an endogenous circatidal periodicity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s002270050529
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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