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首页> 外文期刊>Belgian Journal of Zoology >Seasonal and annual changes in the diet of the Red-backed Shrike Lanius collurio in farmland of Eastern Poland
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Seasonal and annual changes in the diet of the Red-backed Shrike Lanius collurio in farmland of Eastern Poland

机译：波兰东部农田的红背伯劳拉尼乌斯collurio饮食的季节性和年度变化

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摘要

The aim of the study was to identify differences in diet composition of the Red-backed Shrike during the breeding period and between years related to habitat diversity of territories. The study was conducted in 1999-2003 in extensive farmland of Eastern Poland. The diet composition the Red-backed Shrike was analysed based on examination of animal remains in pellets found under nests and places where the birds often stayed. The material was divided into two groups: pellets collected in territories with predominantly arable land and others with predominantly grasslands (meadows and pastures). In territories with the prevalence of arable land the proportion of Hymenoptera in the Red-backed Shrike diet increased, and of Coleoptera decreased, with the progress of the season. A corresponding pattern was not observed in territories comprising grasslands. Territories of the Redbacked Shrike located in the same places in two years did not differ in the proportions of Coleoptera and Hymenoptera in a birds' diet. This can be an evidence of a food stability of Red-backed Shrike's territories in consecutive years and of dietary preferences of this species. Grasslands supported a greater abundance and variety of invertebrates in comparison with arable land. Thus, actual food preferences of Red-backed Shrikes in grassland territories could be causing the lack of a relation between season and the proportion of a given taxon in the diet. Thus, the occurrence of feeding preferences in sites of restricted feeding conditions may not entirely reflect actual food selectivity of the species.
机译：这项研究的目的是确定红背伯劳的繁殖期间以及各年份与栖息地多样性有关的饮食组成差异。该研究于1999-2003年在波兰东部的广阔农田中进行。基于对红背伯劳的饮食成分的分析，是基于对鸟巢和鸟类经常栖息的地方的颗粒中动物残骸的检查。该材料分为两组：在主要有耕地的地区收集的颗粒，以及其他主要有草原（草甸和牧场）的颗粒。随着季节的发展，在耕地盛行的地区，红背伯劳饮食中膜翅目的比例增加，鞘翅目的比例减少。在包括草原的领土上未观察到相应的模式。两年内位于同一地点的红背伯劳鸟的领土在鸟类饮食中鞘翅目和膜翅目的比例没有差异。这可以证明红背伯劳地区连续几年的食品稳定性以及该物种的饮食偏好。与可耕地相比，草原拥有更多的无脊椎动物。因此，草原地区红背Sh猴的实际食物偏爱可能导致季节与饮食中给定分类单元的比例之间缺乏联系。因此，在限制进食条件的地点进食偏好的发生可能无法完全反映物种的实际食物选择性。

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