Power of stable isotope techniques to detect size-based feeding in marine fishes
Power of stable isotope techniques to detect size-based feeding in marine fishes
复制标题
DOI：
10.3354/meps08528
复制
发表时间：
2010-01-01
影响因子：
2.5
通讯作者：
Reid, W. D. K.
中科院分区：
文献类型：
--
作者：
Galvan, D. E.;Sweeting, C. J.;Reid, W. D. K.
稳定同位素技术是目前研究鱼类营养位置（TP）大小变化的最常用方法，数据表明TP随体型变化是常见的。然而，131个整理调查的身体大小和三角洲N-15的近岸沿海鱼类之间的关系，约60%是不显着的。本研究测试是否非显着的趋势反映了一个真实的喂养模式，缺乏统计能力，或两者兼而有之。结果表明，这些研究的相关系数是可用的，实现了足够的统计能力，严格评估观察到的斜率。然后评估了检测不同幅度的统计学显著性趋势所需的样本量，给出了离散假设和采样的体型范围观察数据。即使在低于平均分散度和在整个采样体型范围内均匀采样努力的宽松假设下，
Stable isotope techniques are now the most frequently applied method to investigate size-based variation in fish trophic position (TP), and data suggest changes in TP with body size are common. However, of 131 collated investigations of the relationship between body size and delta N-15 for inshore coastal fishes, approximately 60% were non-significant. The present study tests whether non-significant trends reflect a true feeding pattern, a lack of statistical power, or a function of both. Results suggest none of these studies for which correlation coefficients were available, achieved enough statistical power to rigorously assess observed slopes. The sample size required to detect statistically significant trends of different magnitude, given assumptions of dispersion and observed data on body size range sampled, was then assessed. Even under lenient assumptions of below average dispersion and uniform sampling effort across the sampled body size range,