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首页> 外文期刊>International Journal of Zoology >Experimental Evaluation of Koala Scat Persistence and Detectability with Implications for Pellet-Based Fauna Census
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Experimental Evaluation of Koala Scat Persistence and Detectability with Implications for Pellet-Based Fauna Census

机译：实验性考拉粪便持久性和可检测性的基于球团动物普查的意义

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摘要

Establishing species distribution and population trends are basic requirements in conservation biology, yet acquiring this fundamental information is often difficult. Indirect survey methods that rely on fecal pellets (scats) can overcome some difficulties but present their own challenges. In particular, variation in scat detectability and decay rate can introduce biases. We studied how vegetation communities affect the detectability and decay rate of scats as exemplified by koalas Phascolarctos cinereus: scat detectability was highly and consistently dependent on ground layer complexity (introducing up to 16% non-detection bias); scat decay rates were highly heterogeneous within vegetation communities; exposure of scats to surface water and rain strongly accelerated scat decay rate and finally, invertebrates were found to accelerate scat decay rate markedly, but unpredictably. This last phenomenon may explain the high variability of scat decay rate within a single vegetation community. Methods todecrease biases should be evaluated when planning scat surveys, as the most appropriate method(s) will vary depending on species, scale of survey and landscape characteristics. Detectability and decay biases are both stronger in certain vegetation communities, thus their combined effect is likely to introduce substantial errors in scat surveys and this could result in inappropriate and counterproductive management decisions.
机译：建立物种分布和种群趋势是保护生物学的基本要求，但是获取这些基本信息通常很困难。依靠粪便颗粒（粪便）的间接调查方法可以克服一些困难，但也面临挑战。特别是，粪便可检测性和衰减率的变化会引入偏差。我们研究了植被群落如何影响粪便的可检测性和腐烂率，例如考拉无尾熊（Caass Phascolarctos cinereus）。植被群落中粪便的腐烂率高度异质;粪便暴露于地表水和雨水强烈地加速了粪便的腐烂速度，最后，发现无脊椎动物显着加速了粪便的腐烂速度，但是这是不可预测的。最后一种现象可以解释单个植被群落中粪便腐烂率的高变异性。计划进行粪便调查时，应评估减少偏差的方法，因为最合适的方法会因种类，调查规模和景观特征而异。在某些植被群落中，可检测性和衰减偏差都更强，因此它们的综合影响很可能在粪便调查中引入实质性错误，这可能导致不适当和适得其反的管理决策。

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