关键词：
富山武装乌贼;相拟钩腕乌贼;稳定同位素;摄食生态
摘 要：
为深入了解大洋性小型头足类在海洋食物网中的作用，根据2019年“淞航”号渔业资源调查船所采集的样本，采用碳氮稳定同位素(δ13C、δ15N)技术对西北太平洋富山武装乌贼（Enoploteuthis chunii）和相拟钩腕乌贼（Abralia similis）两种小型头足类的生态位变化进行了研究。结果表明：各站点间富山武装乌贼的δ13C、δ15N和δ15Nb值具有显著性差异（P＜0.05）,相拟钩腕乌贼的δ13C和δ15Nb值具有显著性差异（P＜0.05）,而δ15N值无显著性差异（P＞0.05）;个体发育过程中，富山武装乌贼的δ13C和δ15N值与胴长无显著相关性（P＞0.05）,δ15Nb值与胴长显著相关（P＜0.05）,而相拟钩腕乌贼的δ13C、δ15N和δ15Nb值与胴长无显著相关性（P＞0.05）;富山武装乌贼成鱼期的营养生态位宽度较大（SEAc=1.78‰~2）且与稚鱼期的重叠度较低（0.19）,相拟钩腕乌贼稚鱼期（SEAc=0.68‰~2）与成鱼期的营养生态位宽度（SEAc=0.39‰~2）变化较小，两者之间重叠度中等（0.37）,稚鱼期两种乌贼种间营养生态位重叠度中等（0.33）,而成鱼期种间重叠度较低（0.20）。研究表明，富山武装乌贼的δ13C、δ15N值主要受同位素基线值空间变化及摄食作用的影响，而相拟钩腕乌贼的δ13C、δ15N值则更多受同位素基线值空间变化的影响。
作 者：
ZHANG Jiaqi;LIU Bilin;College of Marine Sciences, Shanghai Ocean University;National Engineering Research Center for Oceanic Fisheries;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education;Key Laboratory of Sustainable Utilization of Oceanic Fisheries, Ministry of Agriculture and Rural Affairs;
关键词：
Enoploteuthis chunii;;Abralia similis;;stable isotope;;ecological niche
摘 要：
To understand the role of small oceanic cephalopods in the marine food web, we studied the ecological niche variations of two small cephalopods, Enoploteuthis chunii and Abralia similis, in the Northwest Pacific Ocean using carbon and nitrogen stable isotope analysis technique based on biological samples collected by fisheries resources survey vessel “Song Hang” in 2019. The results showed that the δ~(13)C, δ~(15)N and δ~(15)N_b values of E.chunii were significantly different among sampling sites(P<0.05), while the δ~(13)C and δ~(15)N_b values of A.similis were significantly different(P<0.05) and the δ~(15)N values were not significantly different(P>0.05). During ontogenetic development, the correlations between δ~(13)C and δ~(15)N values and mantle lengths(MLs) were not significant(P>0.05) in E.chunii, while the correlation between δ~(15)N_b and MLs were significant(P<0.05) in E.chunii; there is no significant difference was observed in the correlations between δ~(13)C, δ~(15)N and δ~(15)N_b values and MLs(P>0.05) in A.similis. Comparative analyses showed that adult E.chunii had a higher niche width(SEAc=1.78‰~2) and a low overlap with the juvenile stage(0.19); less variable of SEAc was found in juvenile(SEAc=0.68‰~2) and adult(SEAc=0.39‰~2) A.similis and a medium overlap was observed between SEAcs in juvenile and adult A.similis(0.37). There was a medium overlap and a low overlap between E.chunii and A.similis at juvenile stage(0.33) and adult stage(0.20), respectively. The analysis suggests that the δ~(13)C and δ~(15)N values of E.chunii were influenced mainly by the isotopes baseline spatial variation and the feeding effect, whereas, the δ~(13)C and δ~(15)N values of A.similis were mainly influenced by the spatial variation of baseline isotope values.
