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首页> 外文期刊>Limnology >Macrophyte-associated macroinvertebrates as an important food source for wintering waterbirds at Lake Constance
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Macrophyte-associated macroinvertebrates as an important food source for wintering waterbirds at Lake Constance

机译：与大型植物相关的大型无脊椎动物是康斯坦茨湖越冬水鸟的重要食物来源

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摘要

In many lake ecosystems, waterbirds rate among the top consumers. Lake Constance is an important overwintering site for waterbirds in Central Europe because it provides sufficient food sources to meet energy demands during the winter months. In this study we focussed on the submerged vegetation and its associated macroinvertebrate fauna as a food source. We conducted experiments with exclosure cages which protected evergreen charophytes from bird grazing and compared the mass decline throughout the winter to unprotected grazed sites. Furthermore, we assessed the change in macrophyteassociated macroinvertebrates during the course of winter. We found that wintering waterbirds caused a significant decline of charophytes and their associated macroinvertebrates down to a depth of 4 m. We determined the taxa and abundance of macroinvertebrates associated with charophytes and predominantly found Dreissena polymorpha. At sites protected from bird grazing, the biomass of the macroinvertebrate fauna increased relative to the plant biomass during the course of winter. This might also have affected the foraging behaviour of diving waterbirds.
机译：在许多湖泊生态系统中，水鸟是最大的消费者。博登湖是中欧重要的水鸟越冬地点，因为它提供了充足的食物来源，可以满足冬季的能源需求。在这项研究中，我们集中于淹没的植被及其相关的大型无脊椎动物动物作为食物来源。我们用防鸟笼进行实验，防鸟笼保护常绿的藻类不受鸟类放牧，并将整个冬季的质量下降与未保护的放牧场进行了比较。此外，我们评估了冬季与大型植物相关的大型无脊椎动物的变化。我们发现越冬的水鸟导致了藻类及其相关的大型无脊椎动物下降到4 m的深度。我们确定了与佛手藻相关的大型无脊椎动物的类群和丰富度，并主要发现了多形果蝇（Dreissena polymorpha）。在防止鸟类放牧的地点，冬季无脊椎动物的生物量相对于植物生物量增加。这也可能影响潜水水鸟的觅食行为。

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