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Freshwater springs on intertidal sand flats cause a switch in dominance among polychaete worms
Zipperle, A.; Reise, K. (2005). Freshwater springs on intertidal sand flats cause a switch in dominance among polychaete worms. J. Sea Res. 54(2): 143-150. https://dx.doi.org/10.1016/j.seares.2005.01.003
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    ANE, Germany, Schleswig-Holstein, Sylt I.
    Environmental effects > Salinity effects
    Environments > Aquatic environment > Marine environment > Intertidal environment
    Interspecific relationships > Competition
    Sedimentary structures > Bed forms > Sand bars
    Water > Brackish water
    Arenicola marina (Linnaeus, 1758) [WoRMS]; Nereis virens Sars, 1835 [WoRMS]
    Sylt [Marine Regions]
    Marien/Kust
Author keywords
    groundwater seepage; brackish water; intertidal sandflat; competition;Arenicola; Nereis
Auteurs  Top 
Abstract
    Effects of freshwater seepage on benthic macrofauna were investigated on the sandy tidal flats near the island of Sylt (German Wadden Sea) in 2002. Several permanent seepage areas (50 to 200 m offshore; up to 200 m2 in area) were examined, in which salinity ranged from 22-29 outside to 0-16 psu inside seepage areas in the upper 20 cm of sediment during summer low tides. The freshwater seepage areas were characterised by an absence of lugworms (Arenicola marina) and a twelve-fold increase in nereid polychaetes (Nereis diversicolor and N. virens) relative to non-seepage areas. Lugworms and ragworms were scarce in a transition zone, which was colonised by juvenile lugworms. We suggest that nereid polychaetes avoid competition with bioturbating lugworms by adapting to areas of low salinity (freshwater seepage).
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