Journal of Dalian Ocean University  2023, Vol. 38 Issue (3): 515-523 DOI: |
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| Comparative analysis of ecological niche of Enoploteuthis chunii and Abralia similis in the Northwest Pacific Ocean |
| ZHANG Jiaqi，LIU Bilin*
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| 1.College of Marine Sciences，Shanghai Ocean University，Shanghai 201306，China；2.National Engineering Research Center for Oceanic Fisheries，Shanghai 201306，China；3.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources，Ministry of Education，Shanghai 201306，China；4.Key Laboratory of Sustainable Utilization of Oceanic Fisheries，Ministry of Agriculture and Rural Affairs，Shanghai 201306，China |
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Abstract 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 δ13C, δ15N and δ15Nb values of E.chunii were significantly different among sampling sites (P<0.05), while the δ13C and δ15Nb values of A.similis were significantly different (P<0.05) and the δ15N values were not significantly different (P>0.05). During ontogenetic development, the correlations between δ13C and δ15N values and mantle lengths (MLs) were not significant (P>0.05) in E.chunii, while the correlation between δ15Nb and MLs were significant (P<0.05) in E.chunii; there is no significant difference was observed in the correlations between δ13C, δ15N and δ15Nb 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 δ13C and δ15N values of E.chunii were influenced mainly by the isotopes baseline spatial variation and the feeding effect, whereas, the δ13C and δ15N values of A.similis were mainly influenced by the spatial variation of baseline isotope values.
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Published: 12 July 2023
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