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Marine mammals

机译:海洋哺乳动物

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Diet estimation is an important field within quantitative ecology, providing critical insights into many aspects of ecology and community dynamics. Quantitative fatty acid signature analysis (QFASA) is a prominent method of diet estimation, particularly for marine mammal and bird species. Investigators using QFASA commonly use computer simulation to evaluate statistical characteristics of diet estimators for the populations they study. Similar computer simulations have been used to explore and compare the performance of different variations of the original QFASA diet estimator. In both cases, computer simulations involve bootstrap sampling prey signature data to construct pseudo-predator signatures with known properties. However, bootstrap sample sizes have been selected arbitrarily and pseudo-predator signatures therefore may not have realistic properties. I develop an algorithm to objectively establish bootstrap sample sizes that generates pseudo-predator signatures with realistic properties, thereby enhancing the utility of computer simulation for assessing QFASA estimator performance. The algorithm also appears to be computationally efficient, resulting in bootstrap sample sizes that are smaller than those commonly used. I illustrate the algorithm with an example using data from Chukchi Sea polar bears (Ursus maritimus) and their marine mammal prey. The concepts underlying the approach may have value in other areas of quantitative ecology in which bootstrap samples are post-processed prior to their use.
机译:饮食估计是定量生态学中的一个重要领域,它为生态学和社区动态的许多方面提供了重要的见识。定量脂肪酸特征分析(QFASA)是一种重要的饮食估计方法,尤其是对于海洋哺乳动物和鸟类而言。使用QFASA的研究人员通常使用计算机模拟来评估所研究人群的饮食估计量的统计特征。已使用类似的计算机模拟来探索和比较原始QFASA饮食估算器的不同版本的性能。在这两种情况下,计算机仿真都需要引导采样猎物签名数据,以构造具有已知属性的伪捕食者签名。但是,引导程序样本大小已被任意选择,因此伪捕食者签名可能不具有现实的属性。我开发了一种用于客观建立引导程序样本大小的算法,该算法生成具有逼真的属性的伪捕食者签名,从而增强了用于评估QFASA估计器性能的计算机仿真的实用性。该算法似乎在计算上也很有效,导致引导程序样本大小小于常用样本大小。我用一个来自楚科奇海北极熊(Ursus maritimus)及其海洋哺乳动物猎物的数据举例说明了该算法。该方法所基于的概念可能在定量生态的其他领域中具有价值,在该领域中,自举样品在使用前需要进行后处理。

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  • 来源
    《Oceanographic Literature Review》 |2016年第2期|368-369|共2页
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