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首页> 外文期刊>ICES Journal of Marine Science >Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient
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Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient

机译：圈养鱼类的移动：沿纬度梯度的生长和营养生态位空间的变化

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The range expansion of tropical fish into temperate waters is increasing markedly in response to climate change. Range-expanding fish encounter novel diets and environments, but we know little about how these conditions facilitate or hinder distribution shifts. Here, we quantified relative growth rate, morphometric condition and trophic niche of juvenile Acanthurus triostegus, a dominant range-expanding tropical surgeonfish, at four locations across 10 degrees of latitude off eastern Australia. We related these metrics to differences in temperature and nutritional quality of dominant seaweeds and the epilithic algal matrix. Temperate food sources were richer in nitrogen than tropical diets. Stable isotope analysis (delta(13) carbon and delta(15) nitrogen) of fish muscle revealed a large trophic niche breadth at the highest latitude indicating a generalist foraging strategy, and more nitrogen-enriched isotopic signatures compared to tropical regions. Fish length was strongly correlated to delta C-13 in all regions, suggesting an ontogenetic shift in diet independent of latitude. Despite temperature differences of 4 degrees C, fish growth and body condition were similar across tropical and temperate regions. These results suggest that more nutritious temperate diets may compensate for the effects of cooler water temperatures. Neither summer water temperatures nor dietary factors appear to limit the success of juvenile tropical vagrants as they continue to expand their range along eastern Australia.
机译：随着气候变化，热带鱼向温带水域的范围扩展明显增加。范围扩大的鱼会遇到新颖的饮食和环境，但我们对这些条件如何促进或阻碍分布变化知之甚少。在这里，我们量化了澳大利亚东部沿海10个纬度的四个位置上的占主导地位的范围扩大的热带刺尾鱼Acanthurus triostegus的相对生长速度，形态条件和营养位。我们将这些指标与优势海藻和上石藻基质的温度和营养质量差异相关联。温带食物来源的氮比热带食物丰富。鱼肌肉的稳定同位素分析（δ（13）碳和δ（15）氮）显示，在最高纬度处有较大的营养生态位宽度，表明具有通才的觅食策略，与热带地区相比，氮富集的同位素特征更多。鱼的长度在所有区域都与C-13高度相关，这表明饮食中的个体发生变化与纬度无关。尽管温度相差4摄氏度，但热带和温带地区的鱼类生长和身体状况相似。这些结果表明，更有营养的温和饮食可以弥补水温较低的影响。夏季水温和饮食因素似乎都没有限制少年热带流浪者的成功，因为它们继续在澳大利亚东部地区扩大范围。

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