■我们研究了两种同胞小袋鼠的发生,红脖子的pademelon(Thylogalethetis)和红腿的pademelon(T.污名)在新南威尔士州东北部,澳大利亚与结构栖息地属性的关系。在我们的研究现场,这两个物种都栖息在封闭的森林环境中,并且分布重叠,但是T.thetis在晚上离开森林以放牧相邻的草林边缘,而T.stigmatica仍留在森林中并浏览森林植被。研究的目的是调查两种森林类型的结构属性,潮湿的硬叶林和雨林,与森林环境中这两种小袋鼠物种的精细规模有关。
■我们收集了48个相机陷阱站的发生数据,这些相机陷阱站平均分配给雨林和湿硬叶林。在每个摄像机点上,我们还测量了一系列结构栖息地属性,以确定两种Thylogale物种的栖息地隶属关系。主成分分析用于描述栖息地的主要趋势,并使用广义线性模型来描述变量在预测每个物种栖息地发生方面的功效。
■Thylogalethetis的发生次数明显大于T.stimatica的发生次数,这是由潮湿的硬叶林中T.thetis的发生率明显增加所驱动的。这两个物种之间存在空间和时间上的划分;在单个相机上,这两个物种的发生有显着差异,而在湿叶树森林中,病斑T.thetis的活动时间表与T.thetis的活动时间表不同,后者达到了最大的发生率。在更精细的(摄像机站)尺度上,T.thetis的发生率随着靠近道路和草地边缘以及岩石较少,陡峭程度较低的地点而增加。在葡萄藤等雨林元素的存在下,棕榈和蕨类植物,更多的地面覆盖和树木落差,以及新兴桉树较少的地点。
■我们的发现对管理这些行星及其栖息地具有启示意义。T.thetis是一种常见的物种,比T.signatica更常遇到,它对路边和草地边缘等人为干扰做出了积极的反应,大概是因为这些地区提供了良好的放牧机会。相比之下,T.污名病是一种受威胁的物种,它对自然干扰做出了反应,比如横向覆盖更大的落树间隙,热带雨林食物植物可能更丰富。我们的研究结果表明,因此,保护受威胁的T.stimatica需要保护完整的雨林。
UNASSIGNED: We studied the occurrence of two sympatric wallabies, the red-necked pademelon (Thylogale thetis) and the red-legged pademelon (T. stigmatica) in northeastern New South Wales, Australia in relation to structural habitat attributes. At our study site, both species inhabit closed forest environments and have overlapping distributions, but T. thetis leaves the forest at night to graze adjacent grassy forest edges whereas T. stigmatica remains within the forest and browses forest vegetation. The objectives of the study were to investigate how structural attributes of two forest types, wet sclerophyll forest and rainforest, relate to the fine-scale occurrence of these two wallaby species within the forested environment.
UNASSIGNED: We gathered occurrence data from 48 camera trap stations divided equally between rainforest and wet sclerophyll forest. At each camera point, we also measured a range of structural habitat attributes to determine habitat affiliations for the two Thylogale species. Principal component analyses were used to describe major trends in habitat, and generalised linear models were used to describe the efficacy of the variables in predicting habitat occurrence of each species.
UNASSIGNED: The number of occurrences of Thylogale thetis was significantly greater than occurrences of T. stigmatica, which was driven by significantly greater occurrences of T. thetis in wet sclerophyll forest. There was both spatial and temporal partitioning between the two species; there was a significant difference in the occurrences of the two species at individual cameras and T. stigmatica had a different activity schedule than T. thetis in wet sclerophyll forest, where the latter reached its greatest rate of occurrence. At a finer (camera station) scale, occurrences of T. thetis increased with proximity to roads and grassy edges and at sites that were less rocky and less steep. T. stigmatica occurrence increased in the presence of rainforest elements like vines, palms and ferns, more ground-level cover and tree-fall gaps and at sites with fewer emergent eucalypts.
UNASSIGNED: Our findings have implications for managing these pademelons and their habitats. T. thetis is a common species that was encountered more often than T. stigmatica, and it responded positively to human disturbance like roadsides and grassy edges, presumably because these areas provided good grazing opportunities. By comparison, T. stigmatica is a threatened species, and it responded to natural disturbance like tree-fall gaps where lateral cover was greater, and where rainforest food plants may be more abundant. Our results suggest, therefore, that conservation of the threatened T. stigmatica requires the preservation of intact rainforest.