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Bird communities of highland birchwoods

机译：高原桦树林的鸟类群落

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摘要

Breeding birds in 36 birchwoods in the Scottish Highlands were counted by point censuses which generated 4630 records of 28 species. Community gradients were found by Detrended Correspondence Analysis (DECORANA) and identified by regressing site scores on habitat factors. The important habitat factors influencing communities were longitude and shrub cover. Longitude had a dominant effect on overall bird density and on species richness, which could not be explained by correlation with other habitat factors. Canopy cover, which was greater to the East, influenced total densities but not community composition. Low shrub cover had a weak effect; there were no pure shrub or high forest elements to communities. Species richness, within a wood, however, did increase with the horizontal variety of extent of shrub cover in addition to the effect of longitude.
机译：苏格兰高地 36 个桦树林中的繁殖鸟类通过点普查进行统计，产生了 28 个物种的 4630 条记录。群落梯度是通过去趋势对应分析（DECORANA）发现的，并通过对生境因素的站点评分进行回归来识别。影响群落的重要生境因素是经度和灌木覆盖度。经度对鸟类总体密度和物种丰富度具有主导作用，这不能用与其他生境因素的相关性来解释。东部的冠层覆盖率较高，对总密度有影响，但对群落组成没有影响。低灌木覆盖度影响较弱;群落中没有纯灌木或高森林元素。然而，除了经度的影响外，木材内的物种丰富度确实随着灌木覆盖程度的水平变化而增加。

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