Wintering forest birds roost in areas of higher sun radiation
Wintering forest birds roost in areas of higher sun radiation
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越冬森林鸟类栖息在太阳辐射较高的地区
DOI：
10.1007/s10344-013-0750-7
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
O. Gordo
中科院分区：
文献类型：
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作者：
S. Villén‐Pérez;L. Carrascal;O. Gordo
我们分析了栖息地选择的环境决定因素树拾穗雀越冬在地中海山地栎林在海拔高度和丘陵阴影模式的高变化的崎岖地区。我们假设，在温带寒冷的冬季气候，鸟类应该在低海拔，较高的温度和较高的太阳辐射的地区过夜，以尽量减少在休息时间的温度调节成本，并改善觅食条件之前和之后栖息。我们研究夜间占用林地的位置存在的粪便在159个木制巢箱（即，在相同的控制栖息的情况下）。我们采用GIS方法来量化巢箱周围每个位置的太阳辐射，并使用数据记录仪来测量现场的空气温度。鸟类更喜欢栖息在具有较高太阳辐射的森林斑块中，其中用于觅食的光照时间延长，白天的温度调节成本最小化。他们还选择了树木较高的林地，这与他们对树干和树枝的觅食偏好一致。其他环境变量发挥了微不足道的作用，在确定栖息地的选择。在这里，我们显示，第一次，太阳辐射的重要性，决定在哪里过夜的越冬鸟类，并呼吁注意考虑在森林管理的热空间。森林管理应保留林地补丁较高的树木更多地暴露在太阳辐射，以提高冬季栖息地的适合鸟类在这些地中海橡树林。
We analyze environmental determinants of roost site selection by tree gleaning passerines wintering in a Mediterranean montane oakwood at a craggy area of high variation in altitude and hill-shading pattern. We hypothesize that in temperate latitudes of cold winter climate, birds should spend the night in areas of low altitudes, higher temperatures, and higher solar radiation in order to minimize thermoregulation costs during resting time and to improve foraging conditions just before and after roosting. We study night occupation of woodland locations by the presence of feces in 159 wooden nest boxes (ie, under identical controlled roosting situations). We employ GIS methods to quantify solar radiation at each location surrounding the nest boxes and data loggers to measure air temperature in the field. Birds prefer to roost in forest patches with higher solar radiation, where the period of light available for foraging is extended and thermoregulation costs during daytime are minimized. They also selected woodland patches with taller trees, a pattern consistent with their foraging preferences for trunks and branches. Other environmental variables played a negligible role in determining the selection of roost sites. Here, we show, for the first time, the importance of sun radiation determining where to spend the night in wintering birds and call attention on considering the thermal space in forest management. Forest management should preserve woodland patches with taller trees more exposed to solar radiation to enhance winter habitat suitability for birds in these Mediterranean oakwoods.