Marine Biology

, Volume 110, Issue 1, pp 93–103 | Cite as

Initial contact, exploration and attachment of barnacle (Balanus amphitrite) cyprids settling in flow

  • L. S. Mullineaux
  • C. A. Butman
Article

Abstract

Settlement responses of barnacle (Balanus amphitrite) cyprids to boundary-layer flows were examined in laboratory flume-experiments. The leading-edge configuration of flat plates was altered in order to manipulate flows without changing surface topography or freestream velocity. Settlement along the plates correlated strongly with downstream gradients in shear stress. Analyses of video images taken during the experiments indicate that cyprids first contact plates in regions where plate-ward advection is high, and subsequent exploratory movement along the plate is oriented with flow direction at the plate surface. After exploration, cyprids reject a surface more frequently in a fast flow (10 cm s−1 freestream velocity) than in a slow flow (5 cm s−1), but rejection occurs in shear stresses well below the threshold that would prevent attachment and exploration. A higher rejection rate does not result in lower settlement, however, since contact rate is higher in fast than slow flows. The movement of cyprids in flow thus appears to be a passive transport process during the initial contact stage of settlement, but an active behavioral response to flow direction and shear stress during later stages of exploration and attachment.

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • L. S. Mullineaux
    • 1
  • C. A. Butman
    • 2
  1. 1.Biology DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA
  2. 2.Applied Ocean Physics and Engineering DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA

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