西北太平洋公海两种大洋性鱿鱼营养生态位分析OA北大核心CSTPCD

In order to have a deep understanding of the role of ocean squid in Northwest Pacific Ocean food web,samples were collected during the comprehensive scientific survey launched by the Ministry of Agriculture and Rural Affairs in 2021 and 2022.Carbon and nitrogen stable isotope technology was used to analyze the muscle stable isotopes and nutritional niches of two cephalopod species,Ommastrephes bartramii and Onychoteuthis borealijaponicus,in Northwest Pacific Ocean.The results show that O.bartramii δ13C and δ15N values between sites were significantly different.O.borealijaponicus 813C values between the two sites showed significant differences,while the δ15N values were not significant.Muscle δ13C and δ15N values between O.bartramii and O.borealijaponicus showed significant differences.During ontogeny,the δ13C andδ15N values of O.bartramii and O.borealijaponicus were not significantly associated with carcass length.The nutrient niche width of O.bartramii(SEAc=0.35％o2)is greater than that of O.borealijaponicus(SEAc=0.20％o2),with a moderate overlap between the two squids(0.314).The high niche overlap between males and females is 0.988 and 0.76,respectively.The analysis shows that the δ13C values of O.bartramii and O.borealijaponicus are influenced by SST and feeding effects,while the δ15N values are influenced by feeding effects.The utilization of food and habitat resources was highly similar in both female and male cephalopod groups.