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首页> 外文期刊>Canadian Journal of Zoology >A large molluscivore bird (Common Eider, Somateria mollissima) is able to discriminate quality of blue mussels (Mytilus edulis) based on size and provenance
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A large molluscivore bird (Common Eider, Somateria mollissima) is able to discriminate quality of blue mussels (Mytilus edulis) based on size and provenance

机译：大型软体动物鸟类（普通绒毛，Somateria mollissima）能够根据大小和出处区分蓝贻贝（Mytilus edulis）的质量

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摘要

Molluscivore birds that forage on abundant but low-quality food have to ingest large quantities of food to achieve energy balance. Such a strategy is often associated with important digestive constraints limiting predator's ingestion. Thus, these predators may use prey selection to ingest better-quality individuals among a generally low-quality prey population. U_sing captive Common Eiders (Somateria moUissima (L., 1758)) diving in a constant environment, we were able to examine their preferences forblue mussels (Mytilus edulis L., 1758) of varying qualities (different sizes or provenances). In addition, we studied the consequences prey selection had on Eiders' energy intake rates and ingestion of flesh and shell material. Eiders selected 10-20 mmmussels and were able to discriminate and to select cultivated mussels from intertidal mussels. Prey selection allowed, in certain conditions of prey-size abundance, higher flesh and energy intake rates without increasing the ingestion of shell material.This study confirmed the energetic advantage that Eiders have when foraging in aquaculture sites, which explain the large depredation of preferred mussel sizes.
机译：觅食丰富但劣质食物的软体动物鸟类必须摄取大量食物才能达到能量平衡。这样的策略通常与限制捕食者摄取的重要消化限制相关。因此，这些掠食者可能会使用猎物选择来摄取质量通常较低的猎物种群中的优质个体。通过在恒定的环境中潜水圈养的普通绒鸭（Somateria moUissima（L.，1758）），我们能够检查出它们对品质不同（大小或出处不同）的青口贻贝（Mytilus edulis L.，1758）的偏好。此外，我们研究了猎物的选择对绒毛虫的能量摄取率以及食肉和贝壳物质的影响。绒鸭选择了10至20毫米的贻贝，并且能够从潮间带贻贝中进行区分和选择养殖贻贝。猎物的选择允许在一定的猎物大小丰度的条件下，增加肉体和能量的吸收率，而不会增加对壳材料的摄入。这项研究证实了绒鸭在水产养殖场觅食时具有的能量优势，这说明了首选贻贝的大批捕捞大小。

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