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首页> 外文期刊>Estuarine Coastal and Shelf Science >Does the zooplankton prey availability limit the larval habitats of pike in the Baltic Sea?
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Does the zooplankton prey availability limit the larval habitats of pike in the Baltic Sea?

机译：浮游动物的猎物可利用性是否会限制波罗的海派克幼体的栖息地？

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The objectives of this study were to (1) investigate whether the availability of suitable zooplankton prey limits the distribution of the coastal larval areas of pike (Esox lucius) in two archipelago areas of the northern Baltic Sea and (2) compare the availability of zooplankton prey in spring between different types of coastal littoral habitat. According to the results, reed belt habitats formed by Phragmites australis constitute hot spots for zooplankton prey in the coastal ecosystem. During the spring, reed-covered shores of the inner archipelago maintained more than 10 times higher densities of copepods and cladocerans, the preferred prey for larval pike, compared to the other studied shores. Temperature conditions were also most favourable in the reed belt habitat. Thus, the reed belts of the inner and middle archipelago were shown to form the best habitat for larval pike in the coastal area of the northern Baltic Sea, and this was also the only habitat where pike larvae were found. Our results suggest that the poor survival and recruitment of pike in the outer archipelago, however, cannot exclusively be explained by sub-optimal feeding conditions of the larvae. There are also other important factors, presumably connected to the exposure to the open sea, that affect the distribution of the pike larvae. Our results, however, highlight the importance of sheltered coastal reed belt shores as reproduction habitat for spring-spawning fish in the northern Baltic Sea. Further, this study disproves the assumption that the seaweed bladder wrack (Fucus vesiculosus) forms a reproduction habitat for pike in the coastal area.
机译：这项研究的目的是（1）研究合适的浮游动物猎物的可利用性是否会限制波罗的海北部两个群岛的梭子鱼（Esox lucius）沿海幼体区域的分布，以及（2）比较浮游动物的可利用性春季在不同类型的沿海沿海栖息地之间捕食。根据结果​​，由芦苇组成的芦苇带栖息地构成了沿海生态系统中浮游动物猎物的热点。春季期间，内群岛的芦苇覆盖的海岸与其他研究过的海岸相比，maintained足类和锁骨类的密度保持高出十倍以上，而pe足类和锁骨类是幼鱼的首选猎物。芦苇带栖息地的温度条件也是最有利的。因此，在波罗的海北部沿海地区，内群岛和中群岛的芦苇带被证明是形成幼鱼派克的最佳栖息地，并且这也是唯一发现了派克幼虫的栖息地。我们的研究结果表明，在外群岛，长矛的存活和募集较差，不能仅仅通过幼体的次佳喂养条件来解释。还有其他重要因素，可能与暴露于公海有关，会影响梭子鱼幼虫的分布。然而，我们的结果强调了庇护沿海芦苇带海岸作为波罗的海北部春季产卵鱼类繁殖栖息地的重要性。此外，本研究还提出了以下假设：海藻膀胱残骸（Fucus vesiculosus）在沿海地区形成了梭子鱼的繁殖地。

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