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Diet of Nestling Red-headed Woodpeckers in South Carolina

机译:在南卡罗来纳州雏鸟雏鸟的饮食

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Melanerpes erythrocephalus (Red-headed Woodpecker) has experienced sharp declines in portions of its range. Knowledge of how birds use their nesting habitats, particularly what foods they exploit, may be important in determining causes of population declines, but no modern quantitative study exists on diets of nestling Red-headed Woodpeckers. Our objectives were to identify diets of nestling Red-headed Woodpeckers and quantify variability in food types over time and between roles of males and females in provisioning their young. We conducted observations of nests on the Savannah River Site, SC, from June to September, 2006-2007. We recorded 791 food items fed to nestlings, representing 7 taxa of plants and 18 taxa of animals (16 invertebrate, 2 vertebrate). We assigned food items as either animal matter or soft mast and compared proportions using a binomial mixed model approach. Of the 12 models we tested, 3 received 67% of the cumulative AIC model weight and all included either year or month, indicating annual and monthly variation in foods fed to nestlings. Animal matter composed the majority of Red-headed Woodpecker nestling foods (71.5%), but notably, soft mast was an important component (28.5%). We suggest that future research on Red-headed Woodpeckers consider how the availability of soft mast may or may not limit productivity of this species.
机译:Melanerpes ererthrocephalus(红头啄木鸟)在其范围内的一部分中经历了急剧下降。了解鸟类如何使用嵌套栖息地,特别是他们利用的食物,在确定人口下降的原因方面可能是重要的,但没有现代的定量研究存在于雏鸟啄木鸟的饮食中。我们的目标是识别嵌入红头啄木鸟的饮食,并随着时间的推移以及雄性和女性在供应年轻的作用之间量化食物类型的可变性。从6月到2006 - 2007年9月,我们在Savannah河网站上进行了巢穴的观察。我们录制了791份送入雏鸟的食品,代表7个植物的分类群和18个动物的分类群(16名无脊椎动物,2个脊椎动物)。我们将食品分配为动物物质或软桅杆,并使用二项式混合模型方法比较比例。在我们测试的12种型号中,3次获得了67%的累积AIC模型重量,所有年份或月份都包括一年或一个月,表明喂食到雏鸟的食物的年度和月度变化。动物物质组成了大多数红头啄木鸟雏鸟食物(71.5%),但值得注意的是,软桅杆是一个重要组成部分(28.5%)。我们建议对红头啄木鸟的未来研究考虑如何柔软桅杆的可用性或可能不会限制该物种的生产力。

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