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首页> 外文期刊>Marine biology >Dietary separation between two blennies and the Pacific gregory in northern Taiwan: evidence from stomach content and stable isotope analyses
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Dietary separation between two blennies and the Pacific gregory in northern Taiwan: evidence from stomach content and stable isotope analyses

机译：台湾北部两个肉类和太平洋地区之间的饮食分离：来自胃液含量和稳定同位素分析的证据

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摘要

Two blennies, Ecsenius lineatus Klausewitz and Ecsenius namiyei (Jordan and Evermann), and a cohabiting territorial damselfish, the Pacific gregory, Stegastes fasciolatus (Ogilby), were collected from shallow reefs in northern Taiwan between September and November 2004, and in October 2005 for stomach content and δ~(13)C and δ~(15)N analyses in an effort to study how extensively their food sources overlapped and to delineate the pattern of cohabiting interactions. These analyses showed differences in food use between the Ecsenius blennies and S. fasciolatus. However, there were inconsistencles. Epiphytic algae were their major food items of E. namiyei and E. lineatus. Macroalgae were rarely taken. Nevertheless, δ~(13)C and δ~(15)N signatures suggested that E. namiyei and E. lineatus might have assimilated mainly macroalgae-derived detritus instead of epiphytic algae. In contrast, macroalgae were the major food items of S. fasciolatus, followed by epiphytic algae. Differences in both δ~(13)C and ~(15)N values indicated that for S. fasciolatus, algae (both macroalgae and epiphytic algae) might not be as important as the stomach contents showed. Instead, polychaetes were possibly its major food source. Differences between stomach contents and evidence from the separation of stable isotope signatures between blennies and the Pacific gregory indicate that some of the interspecific interactions derived from exploitative competition may have been alleviated. Moreover, their widespread territory overlap is possibly a sign of mutualism: S. fasciolatus allows territory sharing, while Ecsenius blennies, in return, clean up the algal mat by removing sand and detritus.
机译：2004年9月至2004年11月，并于2005年10月，从台湾北部的浅礁石中采集了两个皮缝，埃森线虫克劳索维茨和埃森纳米耶（约旦和埃弗曼），以及一个同居的雀鲷，太平洋格里格利斯（Stegastes fasciolatus）（奥吉比）。胃内容物和δ〜（13）C和δ〜（15）N进行分析，以研究其食物来源重叠的程度，并描绘同居相互作用的模式。这些分析表明，埃森尼布利氏菌和费氏链球菌在食物使用上存在差异。但是，存在矛盾之处。附生藻类是它们的主要食物，包括纳米肠埃希氏菌和线虫埃希氏菌。大型藻类很少被食用。然而，δ〜（13）C和δ〜（15）N的特征表明，纳米肠杆菌和线虫可能主要吸收了大型藻类碎屑而不是附生藻类。相比之下，大型藻类是fasciolatus的主要食物，其次是附生藻类。 δ〜（13）C和〜（15）N值的差异表明，对于筋膜葡萄球菌，藻类（大型藻类和附生藻类）可能不如胃内容物那么重要。相反，多毛poly可能是其主要食物来源。胃内容物与绒布和太平洋地区之间稳定同位素特征的分离证据之间的差异表明，某些利用剥削竞争产生的种间相互作用可能已被缓解。此外，它们广泛的领土交叠可能是相互主义的标志：S。fasciolatus允许领土共享，而Ecsenius blennies则通过去除沙子和碎屑来清理藻垫。

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