Giant scallop feeding and growth responses to flow |
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| Institution: | 1. Laboratorio de Fotobiología, Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA, UNComahue-CONICET), Quintral 1250, 8400 San Carlos de Bariloche, Río Negro, Argentina;2. Laboratorio de Análisis por Activación Neutrónica, CAB, CNEA, Av. Bustillo Km 9.5, 8400, San Carlos de Bariloche, Río Negro, Argentina;3. United States Geological Survey, 345 Middlefield Rd./MS 480, Menlo Park, CA 94025, USA;1. Universidade Estadual Paulista (UNESP), Centro de Aquicultura da Unesp, Via de Acesso Prof. Paulo Donato Castelane, 14.884-900 Jaboticabal, São Paulo, Brazil;2. Universidade Estadual Paulista (UNESP), Via de Acesso Prof. Paulo Donato Castelane, 14.884-900 Jaboticabal, São Paulo, Brazil;3. Centro Nacional de Pesquisa e Conservação de Peixes Continentais (CEPTA/ICMBio). Rodovia Euberto Pereira de Godoy, km 6,5, 13630-000 Pirassununga, São Paulo, Brazil;4. Universidade de Rio Verde - FESURV, Campus Universitário, s/n., 75901-970 Rio Verde, Goiás, Brazil |
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| Abstract: | The relationship between ambient seawater flow velocity and growth of the giant scallop Placopecten magellanicus Gmelin is shown to be a reverse ramp function with growth inhibition at flow velocities of > 10–20 cm · s?1. The mechanism of inhibition involves a reduction in ration as velocities around the scallop increase. In ambient flows which are sufficient to cause overloading of the scallop gill, the feeding/filtration rate is reduced by an unknown mechanism, possibly involving the mantle edge closing or a gill bypass mechanism operating. In ambient flows where the pressure at the exhalant opening exceeds the inhalant plus the pressure head created by the gill, as when the scallop is placed dorsal edge to the flow, the tendency for flow reversal is resisted by a similar mechanism involving a reduction in feeding/filtration rate. |
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