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利用稳定同位素方法分析2009年夏季东海中北部23种游泳动物的类群差异、种间和种内变异。结果显示,东海北部游泳动物种间C、N同位素比值变化范围较大,δ15N值范围为6.9‰~13.4‰,1δ3C值为-20.7‰~-14.7‰。其中虾类生物1δ3C平均值为(-17.06±1.43)‰,δ15N平均值为(10.26±0.84)‰;头足类生物1δ3C平均值为(-16.54±0.97)‰,δ15N平均值为(11.68±0.62)‰;小型鱼类δ13C平均值为(-16.27±0.84)‰,δ15N平均值为(10.36±1.25)‰;大中型鱼类δ13C平均值为(-16.89±1.32)‰,δ15N平均值为(11.25±1.03)‰。方差分析结果显示,4个类群的稳定C、N同位素比值具有显著差异(P<0.01)。种内不同个体间也存在较大差异。线性回归表明鹰爪虾(Trachypenaeus curvirostris)、戴氏赤虾(M etapenaeopsisdalei)、脊腹褐虾(Crangon affinis)、小黄鱼(Larim ichthys polyactis)、蓝圆鲹(Decapterus maruadsi)和黄鮟鱇(Lophius litulon)6种游泳动物体长和1δ3C值之间存在显著的相关关系,脊腹褐虾、小黄鱼、银鲳(Pampusargenteus)和白姑鱼(Argyrosomus argentatus)4种动物1δ5N值随体长增加发生显著变化。此外,1δ5N值与种间大小格局也具有显著相关性。稳定同位素分析结果表明,东海游泳动物生态位重叠现象明显,种类摄食特化程度不高,营养结构正趋向简单化。
Stable, isotopic analysis was used to analyze the taxonomic, interspecific and intraspecific variations of 23 species of swimming animals in the northern and central East China Sea in summer of 2009. The results showed that the C and N isotopic ratios of species in the northern East China Sea varied widely, with δ15N ranging from 6.9 ‰ to 13.4 ‰ and 1δ3C ranging from -20.7 ‰ to -14.7 ‰. Among them, the average value of 1δ3C was (-17.06 ± 1.43) ‰ and the average value of δ15N was (10.26 ± 0.84) ‰; the average value of 1δ3C of cephalopods was (-16.54 ± 0.97) ‰ and the average of δ15N was (11.68 ± 0.62) ‰. The average value of δ13C in small fish was -16.27 ± 0.84 ‰, and the average value of δ15N was (10.36 ± 1.25) ‰. The average value of δ13C in large and medium fish was -16.89 ± 1.32 ‰, and the average value of δ15N was (11.25 ± 1.03) ‰. Analysis of variance showed that the stable C and N isotope ratios of the four groups were significantly different (P <0.01). Different individuals within the species also have great differences. Linear regression showed that Trachypenaeus curvirostris, M etapenaeopsisdalei, Crangon affinis, Larim ichthys polyactis, Decapterus maruadsi, and Lophius litulon There was a significant correlation between body length and 1δ3C values in 6 species of swimming animals. The values of 1δ5N in 4 species of P. chinensis, P. crocea, Pampus arginteus and Argyrosomus argentatus significantly changed with body length increasing. In addition, the value of 1δ5N also had a significant correlation with the interspecies size pattern. Stable isotope analysis showed that the phenomenon of overlap of niche in swimmers in the East China Sea was obvious, the specialization of species feeding was not high, and the nutrition structure tended to be simplified.