Impacts of El Niño on the somatic condition of Humboldt squid based on the beak morphology -- Journal of Oceanology and Limnology,2019,37(4):1440-1448

	Cite this paper:
	HU Guanyu, YU Wei, LI Bai, HAN Dongyan, CHEN Xinjun, CHEN Yong, LI Jianhua. Impacts of El Niño on the somatic condition of Humboldt squid based on the beak morphology[J]. Journal of Oceanology and Limnology, 2019, 37(4): 1440-1448

Impacts of El Niño on the somatic condition of Humboldt squid based on the beak morphology

HU Guanyu^1,4, YU Wei^1,5, LI Bai⁴, HAN Dongyan^4,6, CHEN Xinjun^1,2,3,5, CHEN Yong^4,5, LI Jianhua^1,2,3,5

1 College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;
2 National Distant-water Fisheries Engineering Research Center, Shanghai Ocean University, Shanghai 201306, China;
3 Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China;
4 School of Marine Sciences, University of Maine, Orono, Maine 04469, USA;
5 Collaborative Innovation Center for National Distant-water Fisheries, Shanghai 201306, China;
6 College of Fisheries, Ocean University of China, Qingdao 266003, China

Abstract:

The Humboldt squid Dosidicus gigas has a short life span, and environmental variability plays a significant role in regulating its population dynamics and distribution. An analysis of 1 096 samples of D. gigas collected by the Chinese commercial fishing vessels during 2013, 2014, and 2016 off the Peruvian Exclusive Economic Zone, was conducted to evaluate the impacts of El Niño events on the somatic condition of D. gigas. This study indicates that the slopes of all beak variables in relation to mantle length (ML) for females were greater than those of males during 2013, 2014, and 2016, and slopes of the upper crest length and the lower rostrum length significantly differed between females and males in 2013 (P<0.05). Variation in the slopes for beak variables among years was studied; no significant difference was observed (ANCOVA, P>0.05). The Fulton's condition coefficients (K) of females and males in 2013 and 2014 were significantly greater than those in 2016 (P<0.01). The K values of females were greater than those of males in 2013, 2014, and 2016, and K values significantly differed between females and males in 2013. In normal years, the chlorophyll a (Chl a) concentration showed an N-shaped variability from January to December. However, in the El Niño period, it tended to weaken the upwelling coupled with warm and low Chl a concentration waters. We suggest that the poor somatic condition of D. gigas during the El Niño year was resulted from the low Chl a concentration in the waters, and the abundance of D. gigas would decrease due to the unfavourable environment and the lack of prey items in the El Niño year.

Key words: El Niño event|Dosidicus gigas|somatic condition|abundance|beak morphology

Received: 2018-06-16 Revised: 2018-07-22

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Articles by YU Wei

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Articles by LI Jianhua

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