Utility of fish scales from stock assessment surveys in stable isotope analysis for initial assessments of trophic relationships in riverine fish communities
Utility of fish scales from stock assessment surveys in stable isotope analysis for initial assessments of trophic relationships in riverine fish communities
复制标题
种群评估调查中鱼鳞在稳定同位素分析中对河流鱼类群落营养关系初步评估的效用
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Britton
中科院分区：
文献类型：
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作者：
T. Bašić;J. Britton
总结
使用鱼鳞收集的股票评估演习，以评估其稳定同位素d13 C和d15 N的河流鱼类的营养关系的效用进行了测试，使用三个河流鱼类社区在英格兰（河流大乌塞，Ivel和Goyt）。在每一条河流中，欧洲须鱼（Barbus barbus）是一个重要的物种，其他鲤科物种，包括鲢鱼（Squalius cephalus），也存在。2001年、2005年和2006年收集的鱼类样本中，每种鱼的样本量相对较小（<11），每种鱼最多采集5个鳞片，完成了稳定同位素分析。标准椭圆面积的计算结果表明，相对于其他鱼类，B. barbus占据了较高的营养位置，与其他鱼类的营养生态位重叠最小，尤其是与S. cephalus。由于分析的鱼类样本包括不同长度范围的物种，并且由于长度对鱼类饮食组成具有强烈的个体发育影响，因此开发了广义线性模型，其中长度为协变量;模型输出包括每个物种的长度调整平均δ 13 C和δ 15 N。在各鱼类群落中，B. barbus和S. cephalus之间的δ 13 C和δ 15 N差异显著，而B. barbus和其它鱼类之间差异不显著。因此，虽然在稳定同位素分析中使用来自种群评估的鱼鳞的效用由于取样鱼的不同长度范围而受到限制，但当胃内容物分析等方法不可用时，它们可用于确定物种之间的营养差异。
Summary
The utility of using fish scales collected during stock assessment exercises to assess the trophic relationships of riverine fishes using their stable isotopes of d13C and d15N was tested using three riverine fish communities in England (Rivers Great Ouse, Ivel and Goyt). In each river, European barbel Barbus barbus was an important species, with other cyprinid species, including chub Squalius cephalus, present. Stable isotope analyses was completed using relatively small sample sizes per species (<11) from fish samples collected in 2001, 2005 and 2006 when up to 5 scales were collected from each fish. The calculation of standard ellipse areas (as a measure of trophic niche size) revealed that relative to other fishes, B. barbus occupied high trophic positions with minimal overlap in their trophic niche with other species, especially S. cephalus. As the analysed fish samples comprised species of various length ranges and as length has strong ontogenetic consequences for fish diet composition, generalized linear models were developed in which length was the covariate; model outputs included length-adjusted mean δ13C and δ15N for each species. In each fish community, significant differences in δ13C and δ15N were apparent between B. barbus and S. cephalus, but were less apparent between B. barbus and other fishes. Thus, whilst the utility of using fish scales from stock assessments in stable isotope analyses are limited due to the differing length ranges of the sampled fishes, they can be useful in identifying trophic differences between species when methods such as stomach content analyses are unavailable.