Seston quality controls zebra mussel (Dreissena polymorpha ) energetics in turbid rivers
Seston quality controls zebra mussel (Dreissena polymorpha ) energetics in turbid rivers
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DOI：
10.1007/s004420050666
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发表时间：
1998
期刊：
影响因子：
2.7
通讯作者：
D. Schneider;S. Madon;James A. Stoeckel;R. Sparks
中科院分区：
文献类型：
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作者：
D. Schneider;S. Madon;James A. Stoeckel;R. Sparks
斑马贻贝的摄食过程和能量平衡与自然悬浮物的数量和质量有关。随着悬浮物浓度的增加，过滤率和假粪便产生增加，而清除率保持不变。摄食率，同化效率和同化率都随着食物质量的提高而增加，以悬浮物中有机物与无机物的比例来衡量。呼吸速率不随食物数量或质量而变化。因此，随着食物质量的下降，增长的范围也随之下降，在有机：无机比率为0.5时，增长的范围降至0 cal mg−1h− 1以下。摄食过程和食品质量之间的关联似乎与斑马贻贝在悬浮物的有机含量低时选择性摄取高质量有机颗粒的能力的崩溃有关。摄食，同化效率，同化率和范围的增长都较高时悬浮物被修改，除了一个自然的藻类组合。食物质量可能比食物数量更能反映适宜生长的环境条件。这些结果表明，高悬浮无机泥沙浓度的条件下，在大型混浊的河流斑马贻贝的生长环境是一个困难的。
Feeding processes and energetic balance of zebra mussels were both related to the quantity and quality of natural seston. Filtration rate and pseudofeces production increased while clearance rate remained constant with increasing seston concentration. Ingestion rate, assimilation efficiency, and assimilation rate all increased with increasing food quality, measured as the ratio of organic to inorganic material in the seston. Respiration rate did not change with either food quantity or quality. As a result, scope for growth declined with decreasing food quality, and fell below 0 cal mg−1h−1at an organic:inorganic ratio of 0.5. The association between feeding processes and food quality appears related to a breakdown in the ability of zebra mussels to selectively ingest high-quality organic particles when the organic content of the seston is low. Ingestion, assimilation efficiency, assimilation rate and scope for growth were all higher when seston was amended with an addition of a natural assemblage of algae. Food quality may be a better indicator of environmental conditions suitable for growth than food quantity. These results suggest that the conditions of high suspended inorganic sediment concentrations in large turbid rivers represent a difficult growth environment for the zebra mussel.