Clarke M., R. F. McMahon, 1995.   Effects of Current Velocity on Byssal Thread Production in the Zebra Mussel (Dreissena polymorpha), Department of Biology, The University of Texas at Arlington

Proceedings of The Fifth International Zebra Mussel and Other Aquatic Nuisance Organisms Conference, Toronto, Canada, February 1995

Effects of Current Velocity on Byssal the Zebra Mussel (Dreissena polymorpha)

Abstract:
Effect of current velocity on byssal thread production by the zebra mussel (Dreissena polymorpha) was investigated. Number of threads produced by samples of 20 mussels at 25°C exposed to currents velocities of 0.1, 0.15, 0.2, 0.27 m/s were counted over 21 days. Mussels were removed from current daily and number of new threads counted over a period of 21 days after which mussels were removed and their shell length measured. Increased current velocity significantly elevated rates of byssal thread production between 0.1 m/s and 0.2 m/s, velocities of 0.27 m/s suppressed production. Suppression may be due to agitation, interfering with the mussels ability to successfully produce a byssal thread. Mean byssal thread number in a newly formed byssal complex after 21 days exposure was 52.5,63.8, 73.3 and 60.4 at current velocities of 0.1, 0.150.2 and 0.27 m/s respectively. Some of these results are consistent with observations made on the intertidal bivalve Mytilus edulis, others conflict. Results support contention that characteristics of byssal attachment may vary between freshwater and marine species.

Entire Paper
Keywords: Basic_Biology, Byssal_attachment, Zebra_mussel
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