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首页> 外文期刊>Bird Study >Landscape and temporal influences on the winter diet of a threatened diurnal raptor, the Hen Harrier Circus cyaneus
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Landscape and temporal influences on the winter diet of a threatened diurnal raptor, the Hen Harrier Circus cyaneus

机译：景观和时间对受威胁的昼夜猛禽（Hen Harrier Circus cyaneus）冬季饮食的影响

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ABSTRACT Capsule Habitat composition plays a key role in determining the winter diet of the Hen Harrier Circus cyaneus, which varies across the winter season and between years.Aims To determine the winter diet of the Hen Harrier and examine temporal and spatial variations in diet composition.Methods A total of 1117 Hen Harrier pellets were collected from 11 winter roosts between 2017 and 2021 in Ireland.Results Hen Harrier winter diet was dominated by avian prey (95.9 of pellets), with mammalian prey found in 12.0 of pellets. The occurrence of small birds and small mammals in the diet was positively associated with the proportion of arable, wild bird cover, and low-intensity agriculture around the roost sites. The frequency of medium-sized birds (primarily Redwing Turdus iliacus and Common Snipe Gallinago gallinago) in the diet was positively associated with the proportion of bog and young conifer forests surrounding roost sites. Diet varied across regions, with pellets from roosts in lowland coastal areas having a greater prevalence of small birds and small mammals, and pellets from roosts in upland areas having a greater prevalence of medium-sized birds. The proportion of medium-sized birds in the diet changed across months, with that of small birds and small mammals remaining stable. There was also variation between winters in the proportion of small- and medium-sized birds in the diet.Conclusions Habitat, along with region and time, are important drivers of variation in Hen Harrier diet. Our findings highlight the opportunity for the enhancement of Hen Harrier habitat through land management, and can be used to inform effective conservation strategies for wintering Hen Harriers at a landscape scale.
机译：摘要 荚圖栖息地组成在决定母鹞马戏团青色的冬季饮食中起着关键作用，该饮食在冬季和年份之间变化。目的 确定母鹞的冬季饮食，并研究饲料构成的时空变化。方法 2017—2021年爱尔兰11个冬季栖息地共收集到1117份鸡鹞颗粒，结果 鸡鹞冬季日粮以鸟类猎物为主（占颗粒的95.9%），其中哺乳动物猎物占颗粒的12.0%。饮食中小型鸟类和小型哺乳动物的出现与栖息地周围耕地、野生鸟类覆盖和低强度农业的比例呈正相关。饮食中型鸟类（主要是红翅髂和普通鹬）的频率与栖息地周围沼泽和针叶林的比例呈正相关。各地区的饮食各不相同，低地沿海地区栖息的颗粒中小型鸟类和小型哺乳动物的患病率较高，而高地地区栖息的颗粒中型鸟类的患病率较高。中型鸟类在饮食中的比例在几个月内发生了变化，小型鸟类和小型哺乳动物的比例保持稳定。冬季饮食中小型鸟类的比例也存在差异。结论 生境、地域和时间是鸡鹞日粮变化的重要驱动因素。我们的研究结果强调了通过土地管理改善鸡鹞栖息地的机会，并可用于为景观尺度上越冬鸡鹞的有效保护策略提供信息。

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