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首页> 外文期刊>Marine biology >Roach (Rutilus rutilus) as an important predator on blue mussel (Mytilus edulis) populations in a brackish water environment, the northern Baltic Sea
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Roach (Rutilus rutilus) as an important predator on blue mussel (Mytilus edulis) populations in a brackish water environment, the northern Baltic Sea

机译：蟑螂（Rutilus rut​​ilus）是咸淡水环境中波罗的海北部青口贻贝（Mytilus edulis）种群的重要捕食者

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Suspension-feeding bivalves are organisms of major functional importance in several aquatic environments around the world. They are also important food items for many fish and benthivorous seabirds. It has commonly been thought that predation pressure on blue mussel (Mytilus edulis) populations is negligible in the Baltic Sea, owing to the scarcity of major invertebrate predators such as starfish and crabs. It has recently been shown, however, that the blue mussel is the main food item for roach (Rutilus rutilus) in the archipelago areas of the western Gulf of Finland, where this freshwater fish species has become increasingly abundant, mainly due to increased eutrophication. To quantify the influence of roach predation on blue mussel populations we measured the standing biomass and size structure of the local blue mussel population and used a bioenergetic model to estimate mussel consumption by individual roach during two consecutive summers, 1997 and 1998. The results of the model were combined with existing data on roach abundance, giving annual consumption estimates of 75-105 kg blue mussel dry weight ha(-1) in the study area, approximately two-thirds of these consumed mussels being > 10 mm. This corresponds to approximately one-third of the standing population of mussels > 10 mm in the area. Our results suggest that the predation effects of vertebrates on Baltic blue mussel populations are not insignificant, as previously believed. Predation by roach and other predators may have an important structuring effect on unstable blue mussel communities within the Gulf of Finland, where the species lives at the edge of its range.
机译：悬浮喂养的双壳类动物是世界上几种水生环境中具有重要功能的生物。它们也是许多鱼类和杂食海鸟的重要食物。人们普遍认为，由于主要的无脊椎动物捕食者（例如海星和螃蟹）的稀缺，在波罗的海，对贻贝（蓝色贻贝）种群的捕食压力可以忽略不计。然而，最近显示，蓝贻贝是芬兰西部海湾群岛上蟑螂（Rutilus rut​​ilus）的主要食物，那里的淡水鱼物种日益丰富，这主要是由于富营养化的增加。为了量化蟑螂捕食对蓝贻贝种群的影响，我们测量了当地蓝贻贝种群的站立生物量和大小结构，并使用生物能模型来估计1997年和1998年连续两个夏天单个蟑螂的贻贝消费量。该模型与蟑螂丰度的现有数据相结合，得出研究区域年贻贝干重ha（-1）为75-105 kg的年度消费量估计，这些消费过的贻贝中约有三分之二大于10 mm。这大约相当于该地区大于10毫米的贻贝常设种群的三分之一。我们的研究结果表明，脊椎动物对波罗的海贻贝种群的捕食作用并非微不足道，正如先前所相信的那样。蟑螂和其他捕食者的捕食可能对芬兰湾内不稳定的蓝贻贝群落具有重要的构造作用，该物种生活在其范围的边缘。

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