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Growth of juvenileArctica islandica under experimental conditions
Helgoländer Meeresuntersuchungen volume 51, pages 417–431 (1998)
Abstract
In two laboratory experiments, the effects of temperature and food availability on the growth of 10- to 23-mm high specimens of the bivalveArctica islandica were estimated. Each experimental set-up consisted of 5 treatments in which either the food supply or the temperature differed. It was demonstrated thatArctica is able to grow at temperatures as low as 1°C. A tenfold increase of shell growth was observed at temperatures between 1° and 12°C. The greatest change in growth rate took place between 1° and 6°C. Average instantaneous shell growth varies between 0.0003 at 1°C to 0.0032/day at 12°C. The results suggest that temperature hardly affects the time spent in filtration, whereas particle density strongly influences that response. Starved animals at 9°C have their siphons open during only 12% of the time, whereas the siphons of optimally fed animals were open on average during 76% of the observations. Increased siphon activity corresponded to high shell and tissue growth. At 9°C, average shell growth at the optimum cell density of 20×106 cell/l was 3.1 mm corresponding to an instantaneous rate of 0.0026/day. An algal cell density (Isochrysis galbana, Dunaliella marina) ranging between 5 and 7×106 cell/l is just enough to keep shells alive at 9°C. Carbon conversion efficiency at 9°C is estimated to vary between 11 and 14%.
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Witbaard, R., Franken, R. & Visser, B. Growth of juvenileArctica islandica under experimental conditions. Helgoländer Meeresunters. 51, 417–431 (1998). https://doi.org/10.1007/BF02908724
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DOI: https://doi.org/10.1007/BF02908724