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Free Content Effects of bivalve siphonal currents on the settlement of inert particles and larvae

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Abstract:

Dye studies in a flume revealed that the strong exhalent siphonal current of an individual cockle, Clinocardium nuttallii, behaved much like a cylinder held in the flow, shedding vortices downstream. The inhalent flow was much slower and more diffuse, its effects being limited to the lowermost few centimeters above the bottom. Flume experiments with inert particles having settling velocities similar to those of polychaete larvae revealed that the vortex shedding from the excurrent jet led to variability in deposition of the particles a few centimeters downstream of the jet, and that neither the jet nor the incurrent flow substantially changed the mean number of particles depositing per unit area of bed. Field observations within a few days after settlement of Hobsonia florida, an ampharetid polychaete, using ecologically similar but nonplanktonically recruiting oligochaetes as an internal control, showed similarly enhanced variability in recruitment within a few centimeters of the siphon of resident Mya arenaria (soft-shelled clam). We could find no evidence that isolated clams impede settlement in their immediate surroundings and found, instead, some indication of local settlement being enhanced by the flow convergence toward the incurrent siphon. We thus suggest that any negative influence of suspension-feeding bivalves upon settlement is a larger-scale phenomenon caused by depletion of recruits through the integrated filtering activities of individuals upstream of the settlement site. Hence manipulation of bivalve density in small plots may not be very informative regarding influences upon larval settlement.

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/002224088785113342

Publication date: November 1, 1988

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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