The effect of food on the respiration rates of Daphnia magna using a flow-through system
Respiration rates and gut fluorescence of the cladoceran Daphnia magna were studied using a flow-through system. This open system has the advantage of introducing food or producing a starvation effect during the course of the experiment. Severe variations in respiratory rates were observed in relati...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2003 |
| País: | España |
| Repositorio: | accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria |
| OAI Identifier: | oai:accedacris.ulpgc.es:10553/1202 |
| Acceso en línea: | http://hdl.handle.net/10553/1202 |
| Access Level: | acceso abierto |
| Palabra clave: | 251001 Oceanografía biológica Diel Vertical Migration Copepod Acartia-Tonsa Dynamic Action Sda Egg-Production Metabolic-Rate Mesozooplankton Assimilation Chlorophyll Temperature Zooplankton Metabolism Feeding |
| Sumario: | Respiration rates and gut fluorescence of the cladoceran Daphnia magna were studied using a flow-through system. This open system has the advantage of introducing food or producing a starvation effect during the course of the experiment. Severe variations in respiratory rates were observed in relation to the presence or absence of food, indicating short-term variability. Organisms kept starved or at low food for a long period (15-20 h) responded to a sudden increase in food by increasing their respiration rates three- to four-fold in parallel with their gut content. A significant relationship between gut fluorescence and respiration rates was observed, suggesting that feeding and the related swimming activity were responsible for the observed metabolic variability. |
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