Seston quality controls zebra mussel (Dreissena polymorpha) energetics in turbid rivers

被引:47
作者
Schneider, DW
Madon, SP
Stoeckel, JA
Sparks, RE
机构
[1] Univ Illinois, Dept Urban & Reg Planning, Champaign, IL 61820 USA
[2] Illinois Nat Hist Survey, Champaign, IL 61820 USA
[3] San Diego State Univ, Pacific Estuarine Res Lab, San Diego, CA 92182 USA
[4] Illinois Nat Hist Survey, River Res Lab, Forbes Biol Stn, Havana, IL 62644 USA
关键词
food quality; seston; suspended sediment; pseudofeces; particle selection;
D O I
10.1007/s004420050666
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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(-1) h(-1) at 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.
引用
收藏
页码:331 / 341
页数:11
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