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Habitat degradation threatens the survival of the Ethiopian bush crow Zavattariornis stresemanni

机译：栖息地退化威胁埃塞俄比亚丛林乌鸦Zavattariornis stresemanni的生存

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摘要

The Ethiopian bush crow Zavattariornis stresemanni is one of the most remarkable ornithological discoveries of the 20th century. It is restricted to an area of c. 5,000 km~2 in southern Ethiopia, and a large part of its range is protected inside Yabello Wildlife Sanctuary. We report on the results of roadside counts carried out in 1989, 1995 and 2003 showing that the population of the species has decreased by 80% during this time. By comparing two Landsat satellite images from 1986 and 2002, we highlight land cover trends within the range of the species. These include a general increase in bush density, probably related to increasing grazing pressure by domestic animals, fire suppression (only in the Sanctuary) and the disappearance of wild herbivores. Land cover trends differed between the Sanctuary and the area outside, where open areas expanded, apparently indicating an increase in agricultural exploitation. Satellite images also showed that, within its range, the bush crow selects areas having relatively open terrain. Our data suggest that the population decrease within the Sanctuary could be due to the encroachment of open savannah by dense bush and that, therefore, the Sanctuary has failed to protect the bush crow. More research is urgently needed to evaluate its conservation status outside the Sanctuary and the impact of human activities on the species.
机译：埃塞俄比亚丛林乌鸦Zavattariornis stresemanni是20世纪最杰出的鸟类学发现之一。它仅限于c区域。在埃塞俄比亚南部5,000 km〜2，其很大一部分范围都受到Yabello野生动物保护区的保护。我们报告了1989年，1995年和2003年进行的路边计数结果，结果表明该时期该物种的数量减少了80％。通过比较1986年和2002年的两个Landsat卫星图像，我们强调了该物种范围内的土地覆盖趋势。这些包括灌木密度的普遍增加，可能与家畜放牧压力的增加，灭火（仅在保护区）和野生食草动物的消失有关。避难所和外围地区之间的土地覆盖趋势有所不同，开放区域扩大了，这显然表明农业开发的增加。卫星图像还显示，丛林乌鸦会在其范围内选择地形相对开放的区域。我们的数据表明，避难所内的人口减少可能是由于茂密的灌木丛侵占了开放大草原，因此避难所未能保护灌木乌鸦。迫切需要更多的研究来评估其在保护区之外的保护状况以及人类活动对物种的影响。

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