Comparison of feeding habits of jumbo flying squid (Dosidicus gigas) under different climate conditions in the eastern equatorial Pacific Ocean

doi:10.16535/j.cnki.dlhyxb.2023-183

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Journal of Dalian Fisheries University ›› 2024, Vol. 39 ›› Issue (2) : 308-317. DOI: 10.16535/j.cnki.dlhyxb.2023-183

Comparison of feeding habits of jumbo flying squid (Dosidicus gigas) under different climate conditions in the eastern equatorial Pacific Ocean

ZHU Ting，GONG Yi，LI Yunkai*，GAO Xiaodi，ZHANG Jiaxu

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Abstract

In order to comprehend the potential effects of abnormal climate changes on feeding behavior of jumbo flying squid, Dosidicus gigas, items and amounts of stomach content were determined in jumbo flying squid D.gigas collected in June and July of 2017 Normal period and July and August of 2020 La Ni

a period in the eastern equatorial Pacific Ocean by morphological methods and DNA barcoding technology. The results showed that Vinciguerria lucetia, Diogenichthys laternatus, Pteropods and Cephalopods were the main dominant preys of jumbo flying squid in the two climate modes. During the normal climatic period, Sternoptyx diaphana and Dosinia spp. were also consumed by jumbo flying squid, while during the La Ni

a period, Triphoturus mexicanus and Clio pyramidata were included. The Amundsen’s Diagram revealed that the jumbo flying squid has extensive feeding, exhibiting a high within-phenotype component (WPC) type. The Shannon diversity index indicated a higher diversity level in the diet composition of jumbo flying squid during Normal period compared to the La Ni

a period. Non-Metric Multidimensional Scale (NMDS) analysis indicated the significant differences in the feeding habits of jumbo flying squid between the two periods and the preys in La Ni

a period were more generalized. The GII chord diagram and SIMPER similarity results highlighted the S.diaphana and Dosinia spp. as the main contributors to the feeding differences under different climate modes. The significance of constructing a detailed food web was emphasized in the eastern equatorial Pacific Ocean and significance of investigating its energy flow pathway. The findings highlighted that La Ni

a event can significantly impact the feeding behavior of feeding habits of jumbo flying squid under different climate change.

Key words

Dosidicus gigas / stomach content analysis / DNA barcoding / climate variability

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ZHU Ting, GONG Yi, LI Yunkai, GAO Xiaodi, ZHANG Jiaxu. Comparison of feeding habits of jumbo flying squid (Dosidicus gigas) under different climate conditions in the eastern equatorial Pacific Ocean[J]. Journal of Dalian Fisheries University, 2024, 39(2): 308-317 https://doi.org/10.16535/j.cnki.dlhyxb.2023-183