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首页> 外文期刊>Journal of Field Ornithology >Nestling food of the congeneric and sympatric Rusty-margined and Social flycatchers
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Nestling food of the congeneric and sympatric Rusty-margined and Social flycatchers

机译：同类和同伴生锈边缘捕蝇器和社会捕蝇器的雏鸟食物

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摘要

We studied the food of nestling Rusty-margined (Myozetetes cayanensis) and Social flycatchers (M. similis) in 1998 and 1999 at Barro Colorado Island, Panama. Food samples were taken from nestlings by fecal analysis and the neck-collar method. In both species most food items were beetles, winged ants, dragonflies, spiders, and seeds of Miconia spp. Water animals (mainly backswimmers, freshwater snails, and dragonfly larvae) constituted 7.8%-13.5% of animal prey. The nestlings of the Social Flycatcher received significantly more flying insects, while the proportion of fruits and seeds was significantly higher in the diet of Rusty-margined Flycatcher nestlings. Length of animal prey varied from 4-25 mm in the Rusty-margined Flycatcher and 2-50 mm in the Social Flycatcher, and the length of fruits and seeds were 4-11 mm and 2-19 mm, respectively. The average length of animal food was larger in the Rusty-margined Flycatcher despite its slightly smaller size. The number of broods with nestlings or fledglings present in the study area was positively correlated with the abundance of fruits in the Social Flycatcher.
机译：我们研究了1998年和1999年在巴拿马巴罗科罗拉多岛（Barro Colorado Island）筑巢的锈缘（Myozetetes cayanensis）和社会捕蝇器（M. similis）的食物。通过粪便分析和颈领法从雏鸟中获取食物样品。在这两个物种中，大多数食物是甲虫，有翼的蚂蚁，蜻蜓，蜘蛛和Miconia spp的种子。水生动物（主要是回游者，淡水蜗牛和蜻蜓幼虫）占动物猎物的7.8％-13.5％。捕蝇ling幼体的饮食中，社交捕蝇器的雏鸟接受的飞虫明显多于昆虫，而水果和种子的比例明显更高。动物猎物的长度在生锈的捕蝇器中为4-25毫米，在社交捕蝇器中为2-50毫米，水果和种子的长度分别为4-11毫米和2-19毫米。锈缘捕蝇器的动物性食物平均长度较大，尽管尺寸略小。研究区中存在雏鸟或雏鸟的育雏数量与社交捕蝇器中的果实数量呈正相关。

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