Strategies for life in flow:tenacity, morphometry, and probability of dislodgment of two Mytilus species

Abstract

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 159:197-208 (1997) - doi:10.3354/meps159197 Strategies for life in flow: tenacity, morphometry, and probability of dislodgment of two Mytilus species Emily C. Bell*, John M. Gosline Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4 *Present address: Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island 02881, USA. E-mail: bell@uriacc.uri.edu The attachment strength of sessile intertidal organisms is continuously challenged by the hydrodynamic forces generated by breaking waves. This study explores mechanisms by which the attachment strength, or tenacity, can vary for one of the dominant competitors for space in this environment, the marine mussel. Tenacity was measured for 2 co-existing mussel species, Mytilus californianus and Mytilus trossulus, either solitary or within a bed (= bed mussels). The tenacity of M. californianus was higher than M. trossulus, due to increased byssal thread thickness, and the tenacity of solitary mussels was higher than bed mussels, due to the presence of more byssal threads per mussel. These tenacity measurements were coupled with modeled hydrodynamic forces to predict the probability of dislodgment due to wave action. For a given water velocity, the predicted probability of dislodgment of M. californianus was lower than that of M. trossulus because the latter produces relatively thinner threads (reducing tenacity) and a relatively more voluminous shell (increasing hydrodynamic loading). Compared to solitary mussels, bed mussels had a lower probability of dislodgment for a given water velocity (despite their lower tenacity) because they are subjected to relatively smaller hydrodynamic forces. These predictions are consistent with field observations that mussels typically form dense aggregations and that M. trossulus rarely inhabits highly wave-exposed shores. Aggregation · Attachment strength · Biomechanics · Byssal thread · Hydrodynamic force · Intertidal · Mussel · Wave exposure Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 159. Publication date: November 29, 1997 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1997 Inter-Research.