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Biofouling. 2006;22(3-4):153-62.

Factors influencing the attachment strength of Dreissena polymorpha (Bivalvia).

Author information

1
Department of Invertebrate Zoology, Institute of General and Molecular Biology, Nicolaus Copernicus University, ToruĊ„, Poland. jkob@biol.uni.torun.pl

Abstract

The effects of several factors (shell length, exposure time, substratum orientation in space, illumination, temperature, conspecifics) upon the attachment strength (measured with a digital dynamometer) of the freshwater, gregarious bivalve Dreissena polymorpha were studied under laboratory conditions. A rapid increase in attachment strength was observed on resocart (a thermosetting polymer based on phenol-formaldehyde resin, with paper as filler) substrata during the first 4-d exposure, after which it stabilised at ca 1 N. The attachment strength increased also with mussel size. Mussel adhesion on variously oriented surfaces (vertical, upper horizontal and lower horizontal) was similar. Illumination inhibited attachment strength, as expected for a photophobic species, but only after a 2-d exposure. After 6 d, no effects of light were detected. Thus, illumination seemed to influence the attachment rate, rather than the final strength. The optimum temperature for mussel attachment was 20- 25 degrees C. At lower and higher temperatures (5-15 degrees C and 30 degrees C), their adhesion strength decreased. The presence of conspecifics stimulated mussel attachment strength.

PMID:
17290860
[Indexed for MEDLINE]

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