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| Samain, J. F.; Moal, J.; Coum, A.; Le Coz, J. R.; Daniel, J. Y.. |
| A survey of zooplankton physiology on the northern coast of Brittany (France) was carried out over a one-year period by comparing two estuarine areas, one oil-polluted area (Aber Benoit) following the oil spill by the tanker "Amoco Cadiz" and one non-oil-polluted area (Rade de Brest). A new approach to an ecological survey was made by describing trophic relationships using analysis of digestive enzyme equipment (amylase and trypsin) of zooplankton organisms, mesoplankton populations and some selected species. These measurements allowed determination of (a) groups of populations with homogeneous trophic and faunistic characteristics and (b) groups of species with homogeneous trophic characteristics. The study of the appearance of these groups over a... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-5409.pdf |
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| Samain, J. F.; Moal, J.; Daniel, J. Y.; Le Coz, J. R.; Jezequel, M.. |
| Activities of the digestive enzymes amylase and trypsin have been studied during development of Artemia (San Francisco, USA) cultured at different concentrations of phytoplankton (Tetraselmis suecica). The synthesis of the two enzymes varies independently throughout the development. Activity levels are controlled by food levels as well as by food composition. To obtain an optimum assimilation yield at a given food level, an adaptive mechanism would involve 1) modulation of ingestion rates based on physicochemical properties of food particles and 2) regulation of synthesis of digestive enzymes by ingestion and chemical composition of the food. Rates of ingestion and assimilation Vary more during development than does the yield. Maximum yield is achieved... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-5410.pdf |
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