Random versus Game Trail-Based Camera Trap Placement Strategy for Monitoring Terrestrial Mammal Communities.
Random versus Game Trail-Based Camera Trap Placement Strategy for Monitoring Terrestrial Mammal Communities.
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DOI：
10.1371/journal.pone.0126373
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Coulson T
中科院分区：
文献类型：
--
作者：
Cusack JJ;Dickman AJ;Rowcliffe JM;Carbone C;Macdonald DW;Coulson T
相机陷阱调查专门针对增加拍摄一个或几个焦点物种的可能性的景观特征，通常用于推断整个哺乳动物群落的丰富性，组成和结构。然而，这些研究忽略了预期的偏见，在物种检测所产生的采样只有一个有限的一组潜在的栖息地功能。在这项研究中，我们测试相机陷阱放置策略对社区层面的推论的影响进行了两个空间和时间并发调查的中型到大型陆生哺乳动物物种在坦桑尼亚的鲁阿哈国家公园，采用严格的游戏轨迹为基础的或严格随机的相机位置。我们比较了两个观察到的社区的丰富性，组成和结构，并评估了是什么使一个物种显着更容易被抓获的线索放置。所观察到的社区略有不同，在其丰富性和组成，虽然差异更明显，在雨季和低水平的采样工作。对数正态模型提供了最适合的排名丰度分布描述的结构，所有观察到的社区，无论调查类型或季节。尽管如此，食肉动物的物种更有可能被检测到在相对于随机的在旱季，在雨季较大的身体的物种在步道放置。我们的研究结果表明，给予足够的采样努力（> 1400相机陷阱之夜），放置策略是不太可能影响在社区层面上作出的推断。然而，调查应更仔细地考虑他们选择的位置战略时，针对特定的分类或营养组。
Camera trap surveys exclusively targeting features of the landscape that increase the probability of photographing one or several focal species are commonly used to draw inferences on the richness, composition and structure of entire mammal communities. However, these studies ignore expected biases in species detection arising from sampling only a limited set of potential habitat features. In this study, we test the influence of camera trap placement strategy on community-level inferences by carrying out two spatially and temporally concurrent surveys of medium to large terrestrial mammal species within Tanzania’s Ruaha National Park, employing either strictly game trail-based or strictly random camera placements. We compared the richness, composition and structure of the two observed communities, and evaluated what makes a species significantly more likely to be caught at trail placements. Observed communities differed marginally in their richness and composition, although differences were more noticeable during the wet season and for low levels of sampling effort. Lognormal models provided the best fit to rank abundance distributions describing the structure of all observed communities, regardless of survey type or season. Despite this, carnivore species were more likely to be detected at trail placements relative to random ones during the dry season, as were larger bodied species during the wet season. Our findings suggest that, given adequate sampling effort (> 1400 camera trap nights), placement strategy is unlikely to affect inferences made at the community level. However, surveys should consider more carefully their choice of placement strategy when targeting specific taxonomic or trophic groups.
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2.1
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