Relationships between terrestrial vertebrate diversity, abundance and availability of coarse woody debris on south-eastern Australian floodplains
Relationships between terrestrial vertebrate diversity, abundance and availability of coarse woody debris on south-eastern Australian floodplains
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澳大利亚东南部洪泛区陆地脊椎动物多样性、粗木本碎片丰度和可用性之间的关系
DOI：
10.1016/s0006-3207(00)00180-4
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发表时间：
2001
影响因子：
5.9
通讯作者：
C. Tzaros
中科院分区：
文献类型：
--
作者：
R. M. Nally;A. Parkinson;G. Horrocks;L. Conole;C. Tzaros
在澳大利亚东南部的墨累-达令盆地南部，两条河流及其漫滩上的粗木质残体（倒木，CWD）大部分已被剥离。我们的一些工作表明，只有20吨/公顷（平均）留在洪泛区，而曾经的数字可能接近90-125吨/公顷。在这里，我们研究的后果，这种消耗的一个潜在的显着的栖息地结构元素对陆地脊椎动物的洪泛平原森林。三个主要的森林进行了研究：冈鲍尔岛，巴马森林和奥文斯河洪泛区（都在北方维多利亚，澳大利亚）。在每一个森林，7个分级（CWD负载）网站进行了调查，超过2年。我们的研究结果表明，唯一的本土陆生哺乳动物（黄足antechinus antechinus flavipes）占据的网站在显着较高的密度时，木材负荷超过45吨/公顷。地面和CWD使用的鸟类更普遍，在丰富的多样性，在附近的积累的木质残体。总体而言，落木负荷似乎并没有显着相关的鸟类模式，除了在当地规模（即附近的木材积累）。青蛙和爬行动物似乎都没有受到落木荷载的影响。这些结果表明，恢复目标可能合理地设定在约40-50吨/公顷，但似乎鸟类将有助于实施一个高方差的CWD负载密度，而不是均匀分布。爬行动物的数量非常低，这可能反映了从这些栖息地砍伐木材的大规模枯竭;类似的影响可能已经表现在木材枯竭的箱铁树皮森林紧挨着南部的洪泛平原森林。
Coarse woody debris (fallen wood, CWD) has been largely stripped from both rivers and their floodplains in the southern Murray-Darling basin of south-eastern Australia. Some of our work suggests that as little as 20 t/ha (on average) remains on floodplains where once the figure may have been closer to 90–125 t/ha. Here we examine the consequences of this depletion of a potentially significant habitat-structural element on the terrestrial vertebrates of the floodplain forests. Three major forests were studied: Gunbower Island, Barmah Forest and the Ovens River floodplain (all in northern Victoria, Australia). In each forest, seven graded (by loads of CWD) sites were investigated over 2 years. Our results show that the only native terrestrial mammal (yellow-footed antechinus Antechinus flavipes) occupies sites in significantly higher densities when wood loads exceed 45 t/ha. Ground- and CWD-using birds are more prevalent, and in richer diversity, in the vicinities of accumulations of woody debris. Overall, fallen-wood loads do not appear to relate significantly to avian patterns apart from at the local scale (i.e. near wood accumulations). Neither frogs nor reptiles appear to be influenced by fallen-wood loads. These results suggest that restoration targets might reasonably be set at about 40–50 t/ha, but it seems that birds would be aided by the imposition of a high variance in CWD-load densities rather than an even distribution. Numbers of reptiles are very low, which may reflect the very broad-scale depletion of fallen timber from these habitats; similar impacts may have been expressed in wood-depleted box-ironbark forests immediately to the south of the floodplain forests.