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首页> 外文期刊>The Open Ornithology Journal >Factors Affecting Timing of Breeding in the Tawny Owl Strix aluco
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Factors Affecting Timing of Breeding in the Tawny Owl Strix aluco

机译：黄褐色猫头鹰Strix aluco繁殖时机的影响因素

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Relevant variables characterising factors suspected to affect timing of breeding in birds may be difficult tomeasure. Then, easily available proxies, i.e. variables that are expected to vary consistently with some affecting factors,may be used instead. In the present study on tawny owls, I used besides individual characteristics of parent birds both detailedmeasurements of the prey base of territories, local and general indices of vole abundance as well as local and generalweather conditions as explanatory variables. Owls tended to breed the earlier the older and the heavier they were.Breeding was the earlier the higher the abundance of water voles and the proportion of field voles in the territorial preysamples. Owls bred earlier when the local abundance of small voles in the preceding autumn was high. Regional vole indicesshowed no associations with timing of owls' breeding. Single winter weather variables did not show any significantassociations neither. In combination with the advancing effect of water vole abundance, however, the delaying effect ofthe depth of the snow cover in March was significant. Models based on different data sets showed different kinds of associationsbetween the abundance of small voles and timing of breeding in owls. The best models in which both intrinsicand extrinsic explanatory variables (characteristics of parent birds and environmental factors, respectively) were includeddid not differ considerably from each other. The occurrence of water voles in prey samples governed the best models. Theresults suggest, that without detailed knowledge on the prey base of territory, misleading results may emerge and the importanceof small voles in governing breeding of owls may be overemphasised.
机译：有关变量的特征可能被怀疑会影响鸟类的繁殖时间，可能难以衡量。然后，可以替代地使用容易获得的代理，即，预期随一些影响因素而一致地变化的变量。在当前对黄褐色猫头鹰的研究中，除了亲代鸟类的个体特征外，我还使用了对领土猎物基础的详细测量，田鼠丰度的局部和一般指标以及局部和一般天气状况作为解释变量。猫头鹰往往繁殖越早，年龄越大，体重就越重。繁殖越早，田鼠在野外采样中的水鼠数量和田鼠的比例就越高。在前一个秋季，当地的小田鼠数量很多时，猫头鹰就繁殖了。区域田鼠指数显示与猫头鹰的繁殖时间无关。单一的冬季天气变量也没有显示任何显着的关联。然而，结合水田鼠的丰满效应，3月积雪深度的延迟效应是显着的。基于不同数据集的模型表明，小田鼠的数量与猫头鹰的繁殖时间之间存在不同的关联。包含内在和外在解释变量（分别为亲禽的特征和环境因素）的最佳模型彼此之间并没有很大差异。猎物样品中水田鼠的发生决定了最佳模型。结果表明，如果不对领土的猎物基础有详尽的了解，可能会产生误导性的结果，并且过分强调小田鼠在猫头鹰繁殖中的重要性。

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