Estonian Marine Institute, University of Tartu, Mäealuse 14, Tallinn, Estonia.
J Fish Biol. 2011 Feb;78(2):540-51. doi: 10.1111/j.1095-8649.2010.02870.x. Epub 2011 Jan 11.
This study examined how variability in the abundance and biomass structure of benthic invertebrates affected the feeding choice of the whitefish Coregonus lavaretus on a hard bottom habitat of the brackish Baltic Sea. In general, crustaceans such as Idotea balthica and Gammarus spp. were preferred over molluscs. Although being the most numerous taxon in the invertebrate samples, Mytilus trossulus was the lowest ranking in C. lavaretus food preference. The availability of benthic invertebrate prey set the dietary range of fish but the selectivity largely described fish feeding within this range. There was no clear link between fish predation and the dominance structure of benthic invertebrate communities, suggesting that species composition, abundance and biomass of invertebrate species had no impact on the feeding selectivity of the fish. Thus, while fish predation may not affect the dominant species within a benthic community, due to strong selectivity fish may impose strong pressure on some rarer but highly preferred invertebrate prey species.
本研究探讨了底栖无脊椎动物丰度和生物量结构的变化如何影响白鲑（Coregonus lavaretus）在波罗的海半咸水硬底栖息地的摄食选择。一般来说，甲壳类动物（如 Idotea balthica 和 Gammarus spp.）比软体动物更受白鲑的青睐。尽管贻贝（Mytilus trossulus）在无脊椎动物样本中数量最多，但在白鲑的食物偏好中排名最低。底栖无脊椎动物猎物的可利用性决定了鱼类的摄食范围，但选择性在很大程度上描述了鱼类在这个范围内的摄食。鱼类捕食与底栖无脊椎动物群落的优势结构之间没有明显联系，这表明无脊椎动物物种的组成、丰度和生物量对鱼类的摄食选择性没有影响。因此，尽管鱼类捕食可能不会影响底栖群落中的优势物种，但由于强烈的选择性，鱼类可能会对一些较稀有但高度偏好的无脊椎动物猎物施加强烈的压力。
