Growth, filtration and respiration in the mussel Mytilus edulis: No evidence for physiological regulation of the filter-pump to nutritional needs
Growth, filtration and respiration in the mussel Mytilus edulis: No evidence for physiological regulation of the filter-pump to nutritional needs
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DOI：
10.3354/meps141037
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发表时间：
1996-10-01
影响因子：
2.5
通讯作者：
Riisgard, HU
中科院分区：
文献类型：
--
作者：
Clausen, I;Riisgard, HU
在实验室实验中，饲喂红单胞菌藻细胞的蓝贻贝的比生长率随着食物浓度的增加而增加，获得约 9.5% d(-1) 的最大值，无论水中添加的泥沙浓度相对较高（5 mg l(-1)）。同样，净增长效率随着比增长率的增加而增加，达到最大值约75%。对呼吸和生长之间关系的测量表明，生长的能量成本占生长的12%。在短时（5小时）和长时间（9至14天）实验中测量时，在藻类浓度低于约6000个细胞ml（-1）时，100毫克干重“标准”贻贝的过滤率较高且恒定（约30ml min（-1））。 1.3至2.4 x 10(4)细胞ml(-1)的高藻类浓度使过滤率降低约40%。假定最大过滤速率的估计生长令人满意地描述了藻类浓度< 5000个细胞ml(-1)时的实际生长，并且最大生长所需的浓度估计为4500个细胞ml(-1)（相当于5.6μg叶绿素a l(-1)）。用网袋转移到峡湾系统（Kertinge Nor/Kerteminde Fjord，丹麦）的美味贻贝的平均特定增长率约为 6% d(-1)。结果表明，过滤速率对营养需求没有生理调节，自然界中的食物吸收（丹麦水域中叶绿素 a l(-1) 的中位浓度= 5.1 μg 叶绿素 a l(-1)）的特点是充分利用双壳类过滤泵的能力。
The specific growth rate of blue mussels Mytilus edulis fed Rhodomonas sp, algal cells in laboratory experiments increased with increasing food concentration to obtain a maximum value of about 9.5% d(-1), irrespective of a relatively high concentration of silt (5 mg l(-1)) added to the water. Likewise, the net growth efficiency increased with the specific growth rate to a maximum value of about 75%. Measurements of the relationship between respiration and growth showed that the energy cost of growth constituted 12% of the growth. The filtration rate of a 100 mg dry wt 'standard' mussel was high and constant (about 30 ml min(-1)) at algal concentrations below about 6000 cells ml(-1) when measured in both short-time (5 h) and long-time (9 to 14 d) experiments. High algal concentrations of 1.3 to 2.4 x 10(4) cells ml(-1) reduced the filtration rate by about 40%. The estimated growth, presuming maximum filtration rate, satisfactorily described the actual growth at algal concentrations < 5000 cells ml(-1), and the concentration necessary for maximum growth was estimated at 4500 cells ml(-1) (corresponding to 5.6 mu g chlorophyll a l(-1)). The mean specific growth rate in M. edulis transferred in net bags to a fjord system (Kertinge Nor/Kerteminde Fjord, Denmark) was about 6% d(-1). The results show that there is no physiological regulation of the filtration rate to nutritional needs, and that food uptake in nature (median concentration in Danish waters = 5.1 mu g chlorophyll a l(-1)) is characterized by the full exploitation of the capacity of the bivalve filter-pump.