Influences of Ocean Currents on the Diets of Demersal Fish Communities in the Western North Pacific Revealed by Their Muscle Carbon and Nitrogen Isotopic Compositions
Influences of Ocean Currents on the Diets of Demersal Fish Communities in the Western North Pacific Revealed by Their Muscle Carbon and Nitrogen Isotopic Compositions
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DOI：
10.3389/fmars.2021.641282
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
N. Ishikawa;N. Ogawa;Y. Chikaraishi;M. Yamaguchi;K. Fujikura;Y. Miyairi;Y. Yokoyama;T. Nagata;N. Ohkouchi
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文献类型：
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作者：
N. Ishikawa;N. Ogawa;Y. Chikaraishi;M. Yamaguchi;K. Fujikura;Y. Miyairi;Y. Yokoyama;T. Nagata;N. Ohkouchi
为了研究不同海流对同域鱼类群落营养谱的影响，分析了日本东北部海域26种底层鱼类肌肉组织中的放射性碳（Δ 14 C）、稳定碳（δ 13 C）和氮（δ 15 N）同位素组成以及单个氨基酸的δ 15 N。该鱼的Δ 14 C值在-42 ~+41‰之间，与冷的亲潮（典型值约为-50‰）和暖的黑潮（典型值约为+50‰）的溶解无机碳的Δ 14 C值一致。由氨基酸δ 15 N值估算的营养位（TP）随吻长的增加从3.1增加到4.5。在长鳍鱼类和比目鱼中，Δ 14 C与TP之间存在负相关，表明Oyashio海流为这些鱼类提供了高TP的饮食。这些结果表明，在北太平洋西部沿海的海洋鱼类的营养生态主要是由两个主要的表面水流控制，但也显着影响物种特定的喂养和迁移策略相结合。
To study the influence of different ocean currents on the trophic spectra found in a sympatric fish community, we analyzed the radiocarbon contents (Δ14C) and stable carbon (δ13C) and nitrogen (δ15N) isotopic compositions in their bulk muscle tissues and the δ15N of individual amino acids in 26 species of demersal fish collected from off Tohoku (Pacific coast), northeastern Japan. The Δ14C values of the fish varied from –42 to +41‰, consistent with the Δ14C of the dissolved inorganic carbon in the cold Oyashio Current (typically about –50‰) and the warm Kuroshio Current (typically about +50‰). The trophic positions (TPs) of the fish estimated from the δ15N values of amino acids increased from 3.1 to 4.5 with increasing snout length. A negative correlation was observed between Δ14C and TP in gadiform fish and flatfish, suggesting that the Oyashio Current delivers a high TP diet to these fish groups. These results suggest that the trophic ecology of marine fish in the coastal western North Pacific is primarily controlled by the two major surface water currents, but is also significantly influenced by a combination of species-specific feeding and migration strategies.