Habitat factors affecting site occupancy and relative abundance of four-horned antelope
Habitat factors affecting site occupancy and relative abundance of four-horned antelope
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DOI：
10.1111/j.1469-7998.2008.00470.x
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发表时间：
2008-09
影响因子：
2
通讯作者：
Y. Krishna;J. Krishnaswamy;N. S. Kumar
中科院分区：
文献类型：
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作者：
Y. Krishna;J. Krishnaswamy;N. S. Kumar
四角羚羊是印度次大陆特有的物种。它以前广泛分布在整个范围的落叶林中，但目前这种低密度物种的分布格局很大程度上是未知的，缺乏关于物种-栖息地关系的信息阻碍了保护工作。我们在印度重要的四角羚保护区班迪普尔国家公园调查了影响四角羚发生和丰度的栖息地因素。在系统抽样框架下收集的检测/未检测数据被用来检验包含据信影响发生和丰度的协变量的先验假设。四角羚发生和相对丰富度的最佳拟合模型表明，乔木-稀树草原落叶生境亚型是该物种最喜欢的类型，其特征是相对开放的生境，乔木密度较低，落叶程度较高。班迪普尔国家公园和其他保护区的四角羚保护工作应侧重于以树木稀树草原栖息地为代表的地区。四角羚的发生与外来杂草马尾松呈负相关。这种杂草在印度落叶林中的大量传播可能是一个威胁。
The four-horned antelope is endemic to the Indian sub-continent. It was formerly distributed widely in deciduous forests throughout its range, but the current distributional patterns of this low-density species are largely unknown and conservation efforts are hampered by the lack of information on species–habitat relationships. We investigated the habitat factors influencing four-horned antelope occurrence and abundance in Bandipur National Park, an important four-horned antelope conservation site in India. Detection/non-detection data, collected under a systematic sampling framework, were used to test a priori hypotheses incorporating covariates believed to influence occurrence and abundance. The best fitting models for four-horned antelope occurrence and relative abundance reveal that the tree-savanna deciduous habitat sub-type, characterized by relatively open habitats with a lower tree density and a high degree of deciduousness, is most preferred by the species. Four-horned antelope conservation efforts in Bandipur National Park and other reserves should be focused on areas typified by tree-savanna habitats. Four-horned antelope occurrence was negatively related to the alien weed Lantana camara. The prolific spread of this weed in Indian deciduous forests is a likely threat.