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Modeling feeding processes: a test of a new model for sea bream (Sparus aurata) larvae

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Abstract:

An organism's feeding rate is governed by constraints imposed by processes associated with consumption. We present a general feeding model that incorporates encounter, successful pursuit, handling, and digestion in one functional representation where we treat digestion as a parallel process. The model produces type II functional response curves. However, the asymptotic maximum feeding rate is determined by the sum of the time spent for handling and digesting a prey minus the gain in time, since the digestion process is parallel to the handling process. We use our model in combination with existing models of encounter, successful pursuit, and digestion to evaluate the feeding rate of fish larvae. We test the model against experimental data for sea bream (Sparus aurata) larvae and find a very close quantitative correspondence between predictions and experiments. Sensitivity analysis shows that for the early developmental stages, the model is sensitive to parameters related to the visual and locomotion abilities of larvae to detect and capture the prey. Later, when they establish these abilities, the choice of accepting or not the prey becomes more important.

Le taux d'alimentation d'un organisme est contrôlé par des contraintes imposées par les processus associés à la consommation. Notre modèle général d'alimentation incorpore la rencontre de la proie, sa poursuite réussie, sa manipulation et sa digestion dans une seule représentation fonctionnelle dans laquelle la digestion est considérée comme un processus parallèle. Le modèle génère des courbes de réponse fonctionnelle de type II. Toutefois, le taux d'alimentation maximal asymptotique est déterminé par la somme du temps nécessaire à la manipulation et à la digestion d'une proie, moins un gain de temps puisque la digestion est un processus qui se fait en parallèle avec la manipulation. Nous utilisons notre modèle avec d'autres modèles existants de rencontre, de poursuite réussie et de digestion afin d'estimer le taux d'alimentation de larves de poissons. Nous évaluons notre modèle en considérant des données expérimentales obtenues chez des larves de la brême de mer (Sparus aurata) et nous trouvons une très forte correspondance entre nos prédictions et les résultats expérimentaux. Une analyse de sensibilité montre que, chez les premiers stades, le modèle est sensible aux variables reliées aux capacités visuelles et locomotrices impliquées dans la détection et la capture des proies par les larves. Plus tard, lorsque ces capacités sont bien établies, c'est le choix d'accepter ou de refuser la proie qui devient plus important.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2005

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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