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Preying at the edge of the sea: the nemertine Tetrastemma melanocephalum and its amphipod prey on high intertidal sandflats
Kruse, I.; Buhs, F. (2000). Preying at the edge of the sea: the nemertine Tetrastemma melanocephalum and its amphipod prey on high intertidal sandflats. Hydrobiologia 426: 43-55
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Kruse, I.; Buhs, F. (2000). Preying at the edge of the sea: the nemertine Tetrastemma melanocephalum and its amphipod prey on high intertidal sandflats, in: Liebezeit, G. et al. (Ed.) Life at Interfaces and Under Extreme Conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. Hydrobiologia, 426(1-3): pp. 43-55, more

Available in Authors 
Document type: Conference paper

Keywords
    Biological drift; Ecological zonation; Predation; Sand banks; Corophium arenarium Crawford, 1937 [WoRMS]; Nereis (Hediste) diversicolor O.F. Müller, 1776 [WoRMS]; Tetrastemma melanocephalum (Johnston, 1837) [WoRMS]; ANE, Wadden Sea [Marine Regions]; Marine

Authors  Top 
  • Kruse, I.
  • Buhs, F.

Abstract
    In the European Wadden Sea, the nemertine Tetrastemma melanocephalum occurs together with its prey, the amphipod Corophium arenarium, in the upper intertidal zone. T. melanocephalum leaves the sediment when the tide has receded and captures C. arenarium in its U-shaped burrow. Highest abundances of T. melanocephalum on the sediment surface were found on summer evenings, 2-4 h after high tide, when just a thin film of water was left on the flats. Laboratory Y-maze experiments indicated that gradients of substances produced by C. arenarium in this film of water play a role in tracking the prey. In the field, T. melanocephalum appeared in significantly higher numbers on experimental high density patches of C. arenarium. The amphipod in turn is able to recognize the nemertine. In aquarium experiments, significantly more amphipods escaped from the sediment into the water column when the predator was present. In the field, both predator and prey showed a high mobility by drifting in tidal waters. Benthic abundance maxima of T. melanocephalum and C. arenarium usually did not coincide spatially. It is assumed that the nemertines avoid tidal flats that dry out quickly leaving too little time for prey capture. T. melanocephalum is not able to dig into the sediment, but lives in burrows of Nereis diversicolor. The abundance of this polychaete was inversely related to C. arenarium, presenting a dilemma for T. melanocephalum: the spatial overlap of food and accommodation was rather small.

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