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首页> 外文期刊>Marine biology >Foraging behavior of a generalist marine top predator, Japanese cormorants (Phalacrocorax filamentosus), in years of demersal versus epipelagic prey
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Foraging behavior of a generalist marine top predator, Japanese cormorants (Phalacrocorax filamentosus), in years of demersal versus epipelagic prey

机译:在海底捕捞与上层捕食的多年中,全能海洋捕食者日本Japanese(Japanese)的觅食行为

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To examine the behavioral adjustment of a generalist marine top predator to variability of their prey, we studied the foraging behavior of Japanese cormorants (Phalacrocorax filamentosus) breeding at Teuri Island, Hokkaido, in years of contrasting demersal and epipelagic prey composition. We used radio telemetry and ship-based surveys to determine behavior and at-sea distribution during three summers (1996-1998). The cormorants fed on epipelagic anchovy (Engraulis Japonicus) and sandlance (Ammodytes personatus) in 1998 (year of epipelagic diet), while they fed on benthic rock fish (Sebastes spp.) and flatfish (Pleuronectidae) and nearshore-living naked sandlance (Hypophychus dybowskii), as well as epibenthic greenling (Hexagrammidae) in 1996 and 1997 (year of demersal diet). Cormorants engaged in larger feeding groups, visited more feeding sites, and stayed at each feeding site for a shorter period in the year of epipelagic diet than in the years of demersal diet. The cormorants made long foraging trips and fed in the mainland coastal habitat, distant from the colony, in the years of demersal diet. Individual radio-tracked birds fed over the wide area between the islands and mainland, in the year of epipelagic diet, while most individuals specialized in mainland or island coastal habitats in the years of demersal diet. Behavioral adjustment of Japanese cormorants might allow them to exploit both unpredictable epipelagic and predictable benthic prey efficiently.
机译:为了研究全能海洋顶级捕食者对其猎物可变性的行为调整,我们研究了北海道Teuri岛上日本mers(Phalacrocoraxfilosus)繁殖的觅食行为,这些年来海底捕捞和上层捕食者组成形成对比。我们使用无线电遥测和基于船的调查来确定三个夏季(1996-1998年)的行为和海上分布。 1998在1998年(上表层饮食年份)以表层pe鱼(Engraulis Japonicus)和沙矛(Ammodytes personatus)为食,而它们以底栖石鱼(Sebastes spp。)和比目鱼(Pleuronectidae)以及近岸生活的裸露lance鱼(Hypophychuss)为食dybowskii)以及表皮绿色(Hexagrammidae)在1996和1997年(深海饮食的年份)。与上层饮食的年份相比,上表层饮食的在较大的饲养组中活动,拜访了更多的饲养地点,并且在每个饲养地点停留的时间较短。在深海饮食的岁月里,进行了长时间的觅食旅行,并进食了远离殖民地的大陆沿海生境。在上表层饮食的当年,个体通过无线电跟踪的鸟类在岛屿和大陆之间的广阔地区觅食,而在深层饮食的年代,大多数个体专门研究大陆或岛屿的沿海栖息地。日本cor的行为调整可能使他们能够有效地利用不可预测的表皮鱼类和可预测的底栖动物。

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