How to handle ‘poor’ foodstuffs: Acclimation of the common cockle ( Cerastoderma edule ) to detrital diets
| Autor: | Iñaki Urrutxurtu, Enrique Navarro, Miren Bego Urrutia, U. Arambalza, I. Ibarrola |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Cerastoderma edule biology 010604 marine biology & hydrobiology fungi Carbohydrase Aquatic Science Oceanography biology.organism_classification 010603 evolutionary biology 01 natural sciences Acclimatization Isochrysis galbana Animal science Phytoplankton biology.protein Ingestion Cockle Juncus maritimus Ecology Evolution Behavior and Systematics |
| Zdroj: | Journal of Sea Research. 134:16-25 |
| ISSN: | 1385-1101 |
| DOI: | 10.1016/j.seares.2018.01.001 |
| Popis: | As an approach to elucidating the “value” of detritus as a food source for bivalves, we analysed the capability of the common cockle (Cerastoderma edule) to modulate feeding and digestive rates during acclimation to low and high food rations of detrital diets with either low (Juncus maritimus) or high digestibility (Enteromorpha spp.). On acclimation day 3, feeding rates were similar in cockles fed different detrita; however, the absorption rate was higher in cockles fed Enteromorpha spp. With J. maritimus, rising food rations promoted an exponential decrease in absorption efficiency, whereas with Enteromorpha spp., absorption efficiency was only marginally reduced. During acclimation, cockles improved the rate at which both detritus were assimilated by means of increasing ingestion rates while maintaining absorption efficiency. When the time-course of digestive carbohydrase activities was monitored during acclimation to either detritus or phytoplankton (Isochrysis galbana), we found that only phytoplankton promoted the induction of cellulase activity in the digestive glands of cockles. This response in cockles fed phytoplankton promoted an increase in the digestibility of Enteromorpha spp., but had no effect on the digestibility of J. maritimus. |
| Databáze: | OpenAIRE |
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