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首页> 外文期刊>Ostrich >Food and density limitations of the Seychelles Magpie Robin, Copsychus sechellarum, on Cousine Island
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Food and density limitations of the Seychelles Magpie Robin, Copsychus sechellarum, on Cousine Island

机译：考辛岛上的塞舌尔psych（Copsychus sechellarum）的食物和密度限制

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摘要

The critically endangered Seychelles Magpie Robin, Copsychus sechellarum, is one of the rarest birds in the world. At the end of December 1999, there were 88 individuals distributed on four small granite islands: Fregate, Aride, Cousin and Cousine. Little is known of Magpie Robin ecology in its natural habitat. Studies carried out on Aride, Cousin and Cousine are therefore valuable as each island is dominated by native woodland. The composition of Magpie Robin diet was compared between Fregate and Cousine. An exotic species of cockroach, Pycnoscelus indicus, and dropped fish were found to be considerably more important prey items on Cousine. Observations of chick food provisioning indicated habitat quality differences between the territories. Invertebrate and vertebrate food resources available to the Magpie Robin were sampled on Cousine between 1997 and 1998. Fourteen sites were sampled for invertebrates and fifty-two species from fifteen taxa were identified. There were significant differences between the mean number of species recorded per site and the mean number of animals found at each site. Skink density was estimated at between 1219-1516/ha and 354-538/ha for Mabuya sechellensis and Mabuya wrightii respectively. Invertebrate diversity and abundance was greatest in areas dominated by closed-canopy woodland on or near the coastal plain. These results explained the current distribution of Magpie Robin territories. The invertebrate abundance data were used to estimate the carrying capacity of the island for the Magpie Robin. Cousine could theoretically support up to six breeding pairs but it is questionable that a population of this size could be self-sustaining in the long-term.
机译：濒临灭绝的塞舌尔喜psych罗宾（Copsychus sechellarum）是世界上最稀有的鸟类之一。到1999年12月底，共有88个人分布在四个花岗岩小岛上：弗雷盖特，阿里德，库辛和库辛。喜p罗宾生态在其自然栖息地中鲜为人知。因此，对Aride，Cousin和Cousine进行的研究非常有价值，因为每个岛屿都由原生林地主导。喜Fre罗宾饮食的成分在Fregate和Cousine之间进行了比较。人们发现，外来的蟑螂，碧萝P（Pycnoscelus indicus）和掉落的鱼是考辛的重要猎物。雏鸡食物供应的观察结果表明，这些地区之间的栖息地质量存在差异。在1997年至1998年之间，在Cousine上对喜Robin知更鸟可获得的无脊椎动物和脊椎动物食物资源进行了采样。对14个站点的无脊椎动物进行了采样，并从15个分类单元中鉴定了52种。每个站点记录的物种平均数量与每个站点发现的动物平均数量之间存在显着差异。塞舌尔黑檀和莱特黑桃的石龙子密度估计分别在1219-1516 / ha和354-538 / ha之间。在沿海平原上或附近的无盖林地占主导的地区，无脊椎动物的多样性和丰度最大。这些结果解释了喜Robin罗宾地区的当前分布。无脊椎动物的丰度数据被用来估计喜for罗宾岛的承载能力。从理论上讲，Cousine最多可以支持六对育种，但这种规模的种群能否长期自我维持存有疑问。

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