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首页> 外文期刊>New Zealand Journal of Ecology >Calibrating brushtail possum (Trichosurus vulpecula) occupancy and abundance index estimates from leg-hold traps, wax tags and chew cards in the Department of Conservation's Biodiversity and Monitoring Reporting System
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Calibrating brushtail possum (Trichosurus vulpecula) occupancy and abundance index estimates from leg-hold traps, wax tags and chew cards in the Department of Conservation's Biodiversity and Monitoring Reporting System

机译：校准刷毛胶粘剂（Trichosurus除鼠）的占用和丰富指数估计在保护生物多样性和监测报告系统中的腿部持有陷阱，蜡标签和咀嚼卡的估计

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摘要

The Department of Conservation has implemented a Biodiversity and Monitoring Reporting System (BMRS) that estimates occupancy rates and relative abundances of introduced brushtail possums (Trichosurus vulpecula) at a representative sample of sites on public conservation land. Leg-hold traps have been used to monitor possums in the BMRS, but wax tags and chew cards have logistical and financial advantages over traps. If possum occupancy rate and/or abundance index estimates differ depending on which of the three methods are used, then correction of the estimates would be required for valid comparisons. We sampled possum occupancy rates and relative abundances using leg-hold traps, wax tags and chew cards in the BMRS sampling design at each of 54 forest and 54 non-forest sites. Possum occupancy rates estimated using each of the three detection methods were similar and hence do not require correction. Median possum abundance index values estimated from traps were lower than those estimated from wax tags and chew cards in forest, but were similar to those from wax tags in non-forest. Calibration is therefore required if possum abundance index values from either chew cards or wax tags are to be validly compared with trap catch abundance index values. We used a zero-inflated negative binomial (ZINB) model to calibrate the chew card and wax tag abundance indices with the trap catch abundance index. The ZINB model allowed us to account for structural zeros (i.e. possums were not present and therefore cannot be detected) and non-structural zeros (i.e. possums were present, but not detected by a particular method). The relationship between possum abundance index estimates from chew cards and leg-hold traps was better calibrated than that between wax tags and leg-hold traps, with the latter particularly poor in non-forest habitat. We therefore conclude that chew cards, rather than wax tags, should replace leg-hold traps for monitoring possum occupancy rates and relative abundances in the BMRS. Our ZINB model can be used to correct chew card abundance index values for valid comparison with previous trap catch abundance index values estimated using the BMRS design.
机译：保护部实施了生物多样性和监测报告系统（BMRS），其估计在公共保护土地的代表性样本中引入的推出刷尾母鸡（Trichosurus除脱粒）的入住率和相对丰富。腿保持陷阱已被用于监控BMRS中的负鼠，但蜡标签和咀嚼卡具有与陷阱的物流和金融优势。如果POSTUM占用率和/或丰度指数估计因使用其中三种方法中的哪一个而不同，则需要对估计进行校正有效的比较。在54林和54名非森林地点的BMRS采样设计中，使用腿部捕捉陷阱，蜡标签和咀嚼卡进行采样的负载率率和相对丰富。使用三种检测方法中的每一个估计的负占用率相似，因此不需要校正。从陷阱估计的中位数丰富指数值低于森林中蜡标签和咀嚼卡的估计值，而是与非森林中的蜡标签相似。因此，如果与陷阱捕获丰度指数值有效地将来自咀嚼卡或蜡标签的POSTUME丰富索引值有效地进行校准，则需要校准。我们使用了零充气的负二项式（ZinB）模型，以通过陷阱捕获丰度指数校准咀嚼卡和蜡标签丰富指数。 ZinB模型允许我们考虑结构零（即，未存在的负鼠并且不能检测到），并且非结构零（即，存在，但没有通过特定方法检测到。从咀嚼卡和腿部保持陷阱之间的负量丰富指数估计的关系比蜡标签和腿部捕捉陷阱之间的校准更好，后者在非森林栖息地中尤其差。因此，我们得出结论，咀嚼卡，而不是蜡标签，应替代腿部保持陷阱，以监测BMRS中的负载率率和相对丰富。我们的Zinb模型可用于纠正使用BMRS设计估计的先前陷阱捕获丰度指数值的有效比较的咀嚼卡丰度索引值。

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