Short-term and long-term alterations in the energy budget of young oyster Ostrea edulis L. in response to temperature change
Young post-metamorphic oysters, Ostrea edulis L., previously reared at 20 °C, were exposed to 14 °C (cold treatment), 20 °C (control) and 26 °C (warm treatment) for 3 wk. Algal (Isochrysis galbana Parke) ingestion rate (IR), absorption efficiency (AE), oxygen consumption (ifVo2) and ammonia excretio...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1995 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/313499 |
| Acceso en línea: | http://hdl.handle.net/10261/313499 |
| Access Level: | acceso abierto |
| Palabra clave: | Acuicultura Centro Oceanográfico de Murcia |
| Sumario: | Young post-metamorphic oysters, Ostrea edulis L., previously reared at 20 °C, were exposed to 14 °C (cold treatment), 20 °C (control) and 26 °C (warm treatment) for 3 wk. Algal (Isochrysis galbana Parke) ingestion rate (IR), absorption efficiency (AE), oxygen consumption (ifVo2) and ammonia excretion (VNH4) were measured at the beginning, halfway and at the end of the experimental period. These rates were integrated in the energy budget and the net energy gain available for biomass increase, or scope for growth (SFG), was calculated. All the physiological parameters, including AE, were significantly reduced in oysters acutely exposed to the cold treatment. However, following prolonged cold exposure an increase in IR and a slight decrease in Vo2 allowed compensation of the SFG, which in the long-term achieved similar levels to control. After acute exposure to the warm treatment, oysters showed slightly enhanced IR and VNH4 but no major changes in the other physiological parameters, which yielded a slightly increased SFG. In the long-term, IR markedly increased in warm acclimated oysters which, coupled with sustained metabolic costs, allowed an almost three times increase in the SFG. Different adaptive strategies of acclimation described for bivalves are discussed, under the common aim of SFG maximization following long-term exposure to a temperature change; and peculiarities of fast-growing juveniles are evidenced. It is concluded that juvenile oysters are able to respond in the long-term to either a decrease or increase of temperature, regulating the physiological rates integrated in the energy balance in a manner that renders an overall improvement in the net energy available for growth. |
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