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Active pelagic migrations of the bivalve Macoma balthica are dangerous Hiddink, J.G.; Kock, R.P.; Wolff, W.J. (2002). Active pelagic migrations of the bivalve Macoma balthica are dangerous. Mar. Biol. (Berl.) 140: 1149-1156. https://dx.doi.org/10.1007/s00227-002-0794-9 In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793 Is gerelateerd aan: Hiddink, J.G.; Kock, R.P.; Wolff, W.J. (2002). Active pelagic migrations of the bivalve Macoma balthica are dangerous, in: Hiddink, J.G. The adaptive value of migrations for the bivalve Macoma balthica. pp. 51-64, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 280456 [ download pdf ]

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Trefwoorden

ANE, North Sea ANE, Wadden Sea Behaviour > Migrations Macoma balthica (Linnaeus, 1758) [WoRMS] Noordzee [Marine Regions]; Waddenzee [Marine Regions] Marien/Kust

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Auteurs		Top
Hiddink, J.G. Kock, R.P. Wolff, W.J.

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Abstract

The bivalve Macoma balthica migrates twice during the benthic part of its life cycle. During the spring migration (May-June), the newly settled spat (0-group) migrates to the nurseries in the high intertidal. Seven to nine months later, the bivalves migrate back to the low tidal flats and the subtidal (winter migration, 1-group). Both 0- and 1-group M. balthica use byssus threads for active pelagic migrations. As many M. balthica disappear during these migrations, we examined experimentally the importance of predation on 0- and 1-group M. balthica. Laboratory experiments using a circular aquarium determined predation rates on buried (no current) and drifting (current) 0- and 1-group M. balthica by several fish species (plaice, flounder, goby and whiting) and the shore crab. Under illuminated conditions, more M. balthica were consumed when migrating than when buried, whereas there was no difference between experiments in conditions of darkness. For the 0-group, predation rates on migrating and buried M. balthica in the dark were lower than in the light. The stomachs of pelagic fish in the Wadden Sea and Oosterschelde estuary did not contain M. balthica during winter migration. In the Wadden Sea, 1-group M. balthica primarily migrated at night. In conclusion, enhanced predation on drifting, as compared to buried, M. balthica may be the mechanism that explains enhanced mortality during migration in light, and may explain why M. balthica mainly migrates at night in the field. As we found no M. balthica in stomachs of pelagic fish, we do not know whether predation on byssus drifting M. balthica exists in the field. There are, however, some indications for fish predation on infaunal polychaetes during pelagic migrations.

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