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Mesozooplankton stable isotope composition in Cyprus coastal waters and comparison with the Aegean Sea (eastern Mediterranean)

机译：塞浦路斯近海中的中层浮游生物稳定同位素组成及其与爱琴海（地中海东部）的比较

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Here we use bulk and amino acid-specific stable nitrogen (N) isotope analysis (AA-CSIA) to evaluate seasonal and regional change in mesozooplanlcton dynamics for the first time in coastal waters of the eastern Mediterranean. Cyprus mesozooplankton delta N-15 values were significantly higher in late winter (23 parts per thousand) than in summer (1.2 parts per thousand), and in all cases were less than the delta N-15 values of mesozooplankton in the northeast Aegean Sea (NEA; 3.4 parts per thousand). AA-CSIA indicates that these differences can primarily be attributed to seasonal and regional change in mesozooplankton community trophic structure, with overall trophic position increasing by 0.2-0.3 in winter as compared to summer around Cyprus, and trophic position higher in the NEA than in Cyprus by 0.3-0.6. Such differences are most likely related to the larger contribution of carnivorous mesozooplankton observed in winter around Cyprus and in the NEA. Overall, our findings indicate change in bulk mesozooplankton delta N-15 value in the eastern Mediterranean is primarily driven by change in community trophic position, rather than variability in delta N-15 value at the base of the food web. (C) 2014 Elsevier Ltd. All rights reserved.
机译：在这里，我们首次使用大量和氨基酸特定的稳定氮（N）同位素分析（AA-CSIA）来评估地中海东部沿海水域中小球藻动态的季节性和区域变化。塞浦路斯的中型浮游动物δN-15值在冬末（千分之二十三）明显高于夏季（千分之1.2），并且在所有情况下都低于爱琴海东北部中型浮游动物的δN-15值（ NEA； 3.4千分之几。 AA-CSIA指出，这些差异主要归因于中游浮游生物群落营养结构的季节性和区域变化，塞浦路斯的冬季总体营养位置与夏季相比增加了0.2-0.3，NEA的营养位置高于塞浦路斯0.3-0.6。这种差异很可能与在塞浦路斯周围和NEA冬季观察到的食肉中型浮游动物的更大贡献有关。总体而言，我们的发现表明，东地中海中型散食性浮游动物的N-15增量值变化主要是由社区营养位置的变化驱动的，而不是食物网底部N-15值的变化。 （C）2014 Elsevier Ltd.保留所有权利。

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