The utility of repeated presence data as a surrogate for counts: a case study using butterflies
The utility of repeated presence data as a surrogate for counts: a case study using butterflies
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DOI：
10.1007/s10841-013-9610-8
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发表时间：
2014-02-01
影响因子：
1.9
通讯作者：
Shapiro, Arthur M.
中科院分区：
文献类型：
--
作者：
Casner, Kayce L.;Forister, Matthew L.;Shapiro, Arthur M.
数据广泛用于监测长期种群趋势，以管理和保护感兴趣的物种。收集计数数据的程序通常非常昂贵和耗时，限制了可以同时监测的物种数量。另一方面，存在数据通常可以在更短的时间内同时收集多个物种。我们调查的关系，使用49种蝴蝶在4个网站超过9年的存在计数，然后比较从每个指数产生的趋势。我们还采用模拟数据集来测试减少抽样对计数与存在数据之间关系的影响，并调查每个指数的力量变化以揭示人口趋势。存在和计数是高度相关的大多数物种测试，和人口趋势的基础上，每个指数是一致的大多数物种。减少抽样的效果是种特异性的，但在整体上，这两个指数检测人口趋势的灵敏度降低。常见和稀有物种，以及那些具有一系列生活史和行为特征的物种表现同样出色。在飞行季节延长的物种非常丰富和广泛的情况下，存在和计数数据之间的关系可能会破裂。我们的研究结果表明，当谨慎使用时，存在数据有可能被用作计数的替代品。收集存在数据可能有助于多物种监测或减少监测访问的持续时间，而不会完全牺牲推断种群趋势的能力。
Abundance data are widely used to monitor long-term population trends for management and conservation of species of interest. Programs that collect count data are often prohibitively expensive and time intensive, limiting the number of species that can be simultaneously monitored. Presence data, on the other hand, can often be collected in less time and for multiple species simultaneously. We investigate the relationship of counts to presence using 49 butterfly species across 4 sites over 9 years, and then compare trends produced from each index. We also employed simulated datasets to test the effect of reduced sampling on the relationship of counts to presence data and to investigate changes in each index's power to reveal population trends. Presence and counts were highly correlated for most species tested, and population trends based on each index were concordant for most species. The effect of reduced sampling was species-specific, but on a whole, sensitivity of both indices to detect population trends was reduced. Common and rare species, as well as those with a range of life-history and behavioral traits performed equally well. The relationship between presence and count data may break down in cases of very abundant and widespread species with extended flight seasons. Our results suggest that when used cautiously, presence data has the potential to be used as a surrogate for counts. Collection of presence data may be useful for multi-species monitoring or to reduce the duration of monitoring visits without fully sacrificing the ability to infer population trends.