The conservation value of paddock trees for birds in a variegated landscape in southern New South Wales. 2. Paddock trees as stepping stones
The conservation value of paddock trees for birds in a variegated landscape in southern New South Wales. 2. Paddock trees as stepping stones
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DOI：
10.1023/a:1015318328007
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发表时间：
2002-05-01
影响因子：
3.4
通讯作者：
Lindenmayer, DB
中科院分区：
文献类型：
--
作者：
Fischer, J;Lindenmayer, DB
在澳大利亚新南威尔士州南部的一个放牧景观中，对围场树木作为鸟类踏脚石的使用进行了评估。2000年3月，共对70个围场树木点进行了上午20分钟的调查，并在下午对36个地点进行了再次调查。在调查过程中，记录了每只鸟的存在、到达方向和离开和离开地点的方向。从两个方面考察围场树木的踏脚石效应：(1)相对于周围植被覆盖分析鸟类的到达和离开方向；(2)相对于它们的到达方向分析鸟类的离开方向。得到了150组独立行动的候鸟的到达方向，203组独立行动的候鸟的离开方向。获得了87个独立行动组的到达和离开方向。以树叶为食的鸟类倾向于跟随植被相对密集的地区。有迹象表明，花岗岩动物和食蜜动物也倾向于沿着植被密集的地区移动。这种趋势在野外物种中不存在。所有被调查的鸟类都倾向于返回它们的出发地或向相反的方向移动。这一趋势在采蜜动物和叶食性白羽蜜水（Lichenostomus penicillatus）中最为明显，而在野外物种和鹦鹉中则不那么明显。这些结果与各种鸟类的生物学和生态学有关。我们得出的结论是，围场树木有潜力通过充当帮助运动的垫脚石来增强景观的连通性。这进一步突出了它们的保护价值，正如本系列的第一篇论文所展示的那样。
The use of paddock trees as stepping stones by birds was assessed in a grazing landscape in southern New South Wales, Australia. A total of 70 paddock tree sites was surveyed for 20 min each in the morning, and 36 sites were surveyed again in the afternoon in March 2000. During the surveys, the presence, direction of arrival, and direction of departure to and from sites was recorded for each bird. A stepping stone effect of paddock trees was examined in two ways: (1) by analysing the arrival and departure direction of birds relative to surrounding vegetation cover, and (2) by analysing the departure direction of birds relative to their arrival direction. An arrival direction was obtained for 150 independently acting groups of birds, and a departure direction was obtained for 203 independently acting groups of birds. Both arrival and departure direction were obtained for 87 independently acting groups. Foliage-foraging birds tended to follow relatively densely vegetated areas. There was some indication that granivores and nectarivores also preferred to move along densely vegetated areas. This trend was absent for open-country species. All groups of birds examined tended to return to their place of origin or move in the opposite direction of their arrival. This trend was most pronounced for nectarivores and the foliage-foraging White-plumed Honeyeater (Lichenostomus penicillatus), and less pronounced for open-country species and parrots. The results are discussed in relation to the biology and ecology of the various species of birds. We conclude that paddock trees have the potential to enhance landscape connectivity by acting as stepping stones to assist movement. This further highlights their conservation value as demonstrated in the first paper of this series.