Food selection by copepods: discrimination on the basis of food quality
| Autor: | Robert J. Olson, Sallie W. Chisholm, T. J. Cowles |
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| Rok vydání: | 1988 |
| Předmět: |
Exudate
Ecology biology ved/biology digestive oral and skin physiology fungi ved/biology.organism_classification_rank.species Aquatic Science biology.organism_classification Zooplankton Diatom Thalassiosira weissflogii Botany medicine Ingestion Food science medicine.symptom Food quality Ecology Evolution Behavior and Systematics Copepod Acartia tonsa |
| Zdroj: | Marine Biology. 100:41-49 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/bf00392953 |
| Popis: | The copepod Acartia tonsa displayed nearly two-fold higher ingestion rates on faster-growing cells of the diatom Thalassiosira weissflogii compared to ingestion rates on slower-growing cells of that species at the same cell concentration. Ingestion rates on slow-growing cells were also enhanced by the addition of cell-free aliquots of algal exudate to the experimental feeding chambers. In addition, the faster-growing algal cells were selectively ingested by the copepod when the two cell types were mixed together in different proportions, indicating that physiological differences between growing cells are a critical factor in the food detection/selection process of zooplankton. Consideration of cell carbon, nitrogen, and protein composition suggests that the copepods are maximizing nitrogenous ingestion (total protein and/or nitrogen). Selectivity for cells with higher protein content results in a higher daily protein ration, even if the selection process results in a decreased rate of ingestion in mixtures of cell types. |
| Databáze: | OpenAIRE |
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