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首页> 外文期刊>Marine ecology progress series >Hunting high or low: body size drives trophic position among and within marine predators
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Hunting high or low: body size drives trophic position among and within marine predators

机译：高低狩猎：体型决定着海洋捕食者内部和内部的营养位置

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摘要

A positive relationship between body size and trophic position amplitude is expected based on mobility and gape size. Using a dataset of marine consumers' diet, we illu minated mechanisms driving the relationship between consumers' body mass (a proxy for body size) and trophic position parameters within and among populations. We found that across a body size gradient, maximum trophic position increased, while minimum trophic position did not vary, resulting in a positive relationship between species body size and trophic position amplitude. However, using single individuals as data points, we found a positive correlation between trophic position and body mass. The correlation was stronger for larger species, indicating that as mean species body size increased, there was an increasing tendency for smaller individuals to forage on lower levels and larger individuals to forage mainly on higher levels. Therefore, the wider variation in trophic positions we observed for larger species is possibly related to an ontogenetic diet shift in size-structured populations. Our results corroborate the idea that on an individual level larger consumers do not show a positive relationship between body size and diet niche breadth, and support the notion that ontogenetic niche differences can drive the amplitude of trophic position among marine predator species.
机译：基于迁移率和间隙尺寸，期望身体尺寸与营养位置幅度之间呈正相关。使用海洋消费者饮食数据集，我们阐明了驱动消费者体重（代表体重的指标）与种群内部和种群之间的营养位置参数之间的关系的机制。我们发现，在整个体形梯度中，最大营养位置增加，而最小营养位置没有变化，从而导致物种的体形大小与营养位置振幅之间呈正相关。但是，使用单个人作为数据点，我们发现了营养位置与体重之间存在正相关。较大物种的相关性更强，表明随着平均物种体重的增加，较小个体在较低水平上觅食而较大个体主要在较高水平上觅食的趋势有所增加。因此，我们观察到的较大物种的营养位置更广泛的变化可能与大小结构化种群的个体发育饮食变化有关。我们的研究结果证实了这样的观点，即在个体层面上，较大的消费者没有显示出体重与饮食生态位宽度之间的正相关关系，并支持了个体遗传学生态位差异可以驱动海洋捕食动物物种营养位置的观点。

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