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首页> 外文期刊>IBIS >The role of habitat composition in determining breeding site occupancy in a declining Ring Ouzel Turdus torquatus population.
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The role of habitat composition in determining breeding site occupancy in a declining Ring Ouzel Turdus torquatus population.

机译：栖息地组成在确定环铃木种群减少的繁殖地点占用中的作用。

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摘要

Ring Ouzel Turdus torquatus breeding site occupancy in the Moorfoot Hills, southeast Scotland, was determined during the periods 1952-85 and 1998-2000, and sites were classed as either occupied or deserted during the latter period. Site occupancy during 1998-2000 was related to habitat data derived from a supervised classification of a Landsat 7 satellite image. Breeding sites were more likely to have remained occupied if they were at higher altitudes and had more heather cover within radii of both 200 and 450 m, although these effects became non-significant when spatial autocorrelation was accounted for. Using only topographical variables, potential breeding sites were predicted and the habitat surrounding them was compared with actual breeding sites. Actual breeding sites were more likely to have heather or grass-heather mosaic within 100 m than potential breeding sites, but there were no further habitat differences between actual and potential breeding sites within radii of 200 or 450 m. These results indicate that breeding sites at higher altitudes and with a higher cover of heather were less likely to have been deserted, and that lack of heather may prevent otherwise suitable breeding sites from becoming occupied by Ring Ouzels. More detailed field studies are needed to understand the mechanisms underlying these associations..
机译：在1952-85年和1998-2000年期间，确定了苏格兰东南部Moorfoot Hills的Ouzel Turdus环龟繁殖场，并在此期间将其分类为有人居住或荒废。 1998-2000年期间的站点占用情况与根据Landsat 7卫星图像的监督分类得出的栖息地数据有关。如果将繁殖场所置于较高的高度，并且在200和450 m的半径内都有更多的石楠覆盖，则繁殖场所更可能被占用，尽管考虑到空间自相关后这些影响变得不明显。仅使用地形变量，就可以预测潜在的繁殖地点，并将其周围的栖息地与实际繁殖地点进行比较。实际的繁殖地点比潜在的繁殖地点更有可能在100 m内出现石南花或草石花叶镶嵌，但实际和潜在的繁殖地点之间的半径在200或450 m之内没有进一步的生境差异。这些结果表明，海拔较高，石楠覆盖率较高的繁殖地点被荒漠的可能性较小，而且缺乏石楠可能会阻止原本合适的繁殖地点被环乌泽尔群岛占据。需要更详细的实地研究以了解这些关联的潜在机制。

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