Growth of juvenileArctica islandica under experimental conditions
Growth of juvenileArctica islandica under experimental conditions
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实验条件下北极岛幼鱼的生长
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
B. Visser
中科院分区：
文献类型：
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作者：
R. Witbaard;R. Franken;B. Visser
在两个实验室实验中，温度和食物供应的影响，对10- 23毫米高的标本的bivalveArctica islandica的增长进行了估计。每个实验装置由5个处理组成，其中食物供应或温度不同。结果表明，北极星能够在低至1°C的温度下生长。在1° C至12°C之间的温度下，观察到贝壳生长增加了十倍。生长速率的最大变化发生在1°和6°C之间。平均瞬时壳生长量在1°C时为0.0003/天至12°C时为0.0032/天之间变化。结果表明，温度几乎不影响过滤所花费的时间，而颗粒密度强烈影响该响应。在9°C下饥饿的动物只有12%的时间内虹吸管打开，而在76%的观察时间内，最佳喂养的动物的虹吸管平均打开。虹吸管活动增加对应于高壳和组织生长。在9°C时，在最佳细胞密度为20×106个细胞/l时，平均壳生长为3.1 mm，对应于0.0026个/天的瞬时速率。藻类细胞密度（球等鞭金藻、杜氏藻）在5 × 106个细胞/升到7×106个细胞/升之间，刚好足以使贝壳在9°C下存活。9°C时的碳转化效率估计在11%至14%之间变化。
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%.