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Testing the Role of Climate Change in Species Decline: Is the Eastern Quoll a Victim of a Change in the Weather?

机译:测试气候变化在物种中的作用下降:东部古怪是天气变化的受害者吗?

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摘要

To conserve a declining species we first need to diagnose the causes of decline. This is one of the most challenging tasks faced by conservation practitioners. In this study, we used temporally explicit species distribution models (SDMs) to test whether shifting weather can explain the recent decline of a marsupial carnivore, the eastern quoll (Dasyurus viverrinus). We developed an SDM using weather variables matched to occurrence records of the eastern quoll over the last 60 years, and used the model to reconstruct variation through time in the distribution of climatically suitable range for the species. The weather model produced a meaningful prediction of the known distribution of the species. Abundance of quolls, indexed by transect counts, was positively related to the modelled area of suitable habitat between 1990 and 2004. In particular, a sharp decline in abundance from 2001 to 2003 coincided with a sustained period of unsuitable weather over much of the species’ distribution. Since 2004, abundance has not recovered despite a return to suitable weather conditions, and abundance and area of suitable habitat have been uncorrelated. We suggest that fluctuations in weather account for the species’ recent decline, but other unrelated factors have suppressed recovery.
机译:为了保护物种下降,我们首先需要诊断下降的原因。这是保护从业者面临的最具挑战性的任务之一。在这项研究中,我们使用时间明确的物种分布模型(SDM)来测试天气的变化是否可以解释有袋食肉动物最近的下降,即东部的猛禽(Dasyurus viverrinus)。我们开发了一种SDM,该模型使用了与过去60年来东部鼠的发生记录相匹配的天气变量,并使用该模型重建了该物种在气候上合适的范围内随时间的变化。天气模型对已知物种分布产生了有意义的预测。通过样点计数索引的洋流丰度与1990年至2004年之间的适宜生境的建模面积呈正相关。特别是,2001年至2003年,丰度急剧下降,同时该物种的大部分地区持续出现不合适的天气分配。自2004年以来,尽管恢复了合适的天气条件,丰度仍未恢复,而且合适栖息地的丰度和面积也没有关联。我们建议天气的波动是造成该物种近期下降的原因,但其他不相关的因素抑制了该物种的恢复。

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