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首页> 外文期刊>Marine ecology progress series >Winter foraging by a top predator, the grey seal Halichoerus grypus, in relation to the distribution of prey
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Winter foraging by a top predator, the grey seal Halichoerus grypus, in relation to the distribution of prey

机译：顶级捕食者灰色海豹Halichoerus grypus在冬季觅食与猎物分布有关

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摘要

Identifying foraging areas of individuals and correlating them with potential food resources allows for a better understanding of predator-prey relationships. Herein, we examine whether grey seal movements were associated with overwintering concentrations of several commercial fish species in the Cabot Strait, Atlantic Canada, using data from satellite transmitters deployed on grey seals (between 1993 and 2005) and winter bottom-trawl survey data (1994 to 1997). The distribution of searching effort by male grey seals varied throughout the winter. In early winter, males concentrated their movements around St. Paul's Island. In late winter, they were found to the southeast of this area, where females also occurred. The fish community differed between apparent foraging and non-foraging areas. Densities of small plaice, hake and red-fish, large herring and cod of all sizes were relatively high in the male grey seal foraging zones; female foraging zones were characterized by higher densities of small plaice and redfish and large cod. Areas where grey seal foraging was not concentrated were characterized by high densities of medium and large redfish as well as large turbot and witch flounder. Diet samples are needed to determine whether grey seals are feeding on the fish groups that distinguish foraging from non-foraging areas or alternatively on other prey that occur in the same areas.
机译：确定个体的觅食区域并将其与潜在的食物资源相关联，可以更好地了解食肉动物与猎物的关系。本文中，我们使用部署在灰海豹上的卫星发射器的数据（1993年至2005年之间）和冬季海底拖网调查数据（1994年），研究了灰海豹运动是否与加拿大大西洋省卡博特海峡的几种商业鱼类的越冬浓度有关。至1997年）。在整个冬季，雄性灰海豹搜寻力的分布各不相同。在初冬，雄性集中在圣保罗岛周围的活动。在冬季末期，在该地区的东南部发现了它们，那里也有雌性动物。鱼群在明显的觅食区和非觅食区之间有所不同。雄性灰海豹觅食区的小，无须鳕和红鱼，大鲱鱼和鳕鱼的密度相对较高。雌性觅食区的特征是较高密度的小，红鱼和大鳕鱼。灰海豹觅食不集中的地区的特点是高密度的中型和大型红鱼以及大菱turbo和比目鱼。需要饲料样品来确定灰海豹是否以区分觅食和非觅食区域的鱼类为食，或者是捕食同一地区的其他猎物。

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