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首页> 外文期刊>ICES Journal of Marine Science >Trophodynamic similarities of three sympatric clupeoid species throughout their life histories in the Kii Channel as revealed by stable isotope approach
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Trophodynamic similarities of three sympatric clupeoid species throughout their life histories in the Kii Channel as revealed by stable isotope approach

机译：通过稳定同位素方法揭示的在基伊海峡中，三个同伴类蝶类物种在其整个生活史中的营养动力学相似性

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摘要

Trophic similarity/difference among multispecies pelagic fish is a focal point in understanding the processes of climate impacts on their population dynamics. We tested trophic overlap of Japanese anchovy Engraulis japonicus, Japanese sardine Sardinops melanostictus, and Pacific round herring Etrumeus teres in the Kii Channel, Japan, by comparing the carbon and nitrogen stable isotope ratios among these clupeoid species from the larval to adult stages throughout the year. Space and time were both significant factors of variations of the isotopic composition values for the three species, and fish size was also significant for sardine and round herring. The isotopic composition values of the three species were homogeneous when compared with those of plankton and some other non-clupeoid species. Moreover, the isotopic composition values of the three clupeoid species collected simultaneously showed closer similarities than those in different areas and dates in all life stages. Thus, spatial and temporal differences in food availability were more apparent compared with interspecific differences in prey items specific to each species. Our analysis indicated strong trophic overlaps throughout the life histories among the three clupeoid species. Hence, they are concluded to be ecologically congeneric (directly competing) species in terms of trophic positions in the pelagic ecosystem.
机译：多种中上层鱼类之间的营养相似性/差异性是了解气候对其种群动态影响过程的重点。通过比较从幼虫到成年阶段的这些类蝶类物种的碳和氮稳定同位素比率，我们在日本的纪伊海峡中测试了日本an鱼，日本沙丁鱼，日本沙丁鱼，黑沙丁鱼和太平洋鲱鱼的营养重叠。 。时空都是这三种物种同位素组成值变化的重要因素，沙丁鱼和鲱鱼的鱼大小也很重要。与浮游生物和其他一些非类CLP类物质相比，这三种物质的同位素组成值是均匀的。此外，与三个生命周期中不同地区和日期相比，同时收集到的三种类蝶类物种的同位素组成值显示出更相似的相似性。因此，与每种物种特有的猎物的种间差异相比，食物可获得性的时空差异更加明显。我们的分析表明，在整个生活史中，这三个类蝶形物种之间存在着强烈的营养重叠。因此，就远洋生态系统中的营养位置而言，它们被认为是生态上属的（直接竞争）物种。

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