Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (4): 61-69.doi: 10.11978/2019105CSTR: 32234.14.2019105

• Marine Biology • Previous Articles     Next Articles

Study on food contents of Uroteuthis chinensis and Sthenoteuthis oualaniensis based on COI sequence

Mengna LIU1,3,4(), Lei XU3,4, Xuehui WANG3,4, Yu LIU5, Miaodi WANG1,3,4, Yongsong QIU3, Jiangfeng ZHU1, Yinglin HE2, Weilie BEI2, Feiyan DU3,4()   

  1. 1. College of Marine Science, Shanghai Ocean University, Shanghai 201306, China
    2. China Blue Sustainability Institute, Haikou 570208, China
    3. South China Sea Fisheries Research Institute, China Academy of Fishery Sciences, Guangzhou 510300, China
    4. Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China
    5. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  • Received:2019-10-29 Revised:2020-01-19 Online:2020-07-20 Published:2020-07-27
  • Contact: Feiyan DU E-mail:monarliu@163.com;feiyanegg@163.com
  • Supported by:
    Foundation item: The Science and Technology Project of Basic Resources of China(2017FY201405);Basal Research Fund of Chinese Academy of Fishery Sciences(2019HY-JC0203);Open Foundation of Key Laboratory of Fishery Ecology Environment of Guangdong Province(FEEL-2019-9)

Abstract:

Uroteuthis chinensis and Sthenoteuthis oualaniensis are key species of the cephalopods in the South China Sea, which have important effects on the material flow and energy circulation in the marine ecosystem. The study of feeding ecology of these two cephalopods will be great significant to the construction of marine food web. Because of the sharp tooth decay, the stomach contents are all scorpion-like, and it is difficult to accurately identify them by traditional morphological methods. And the effectiveness of molecular techniques in feeding analysis of these two species has not been fully validated. In this study, we identified the species (or genus) in the stomach contents of U. chinensis and S. oualaniensis based on the mitochondrial COI gene, and used the Generalized Mixed Yule Coalescent (GMYC) model for species definition and phylogenetic tree building. The results showed that of a total of 41 stomach contents sequences (28 from U. chinensis and 13 from S. oualaniensis), 30 (73%) were identified as species, and the rest were determined as genus (all are crustaceans). The diets of U. chinensis in Shantou-Taiwan Shoal fishing ground included fish, cephalopods, and crustaceans; and the diets of S. oualaniensis in the Central South China Sea were fish and cephalopods. Cannibalism occurred in both species, but was more pronounced in S. oualaniensis.

Key words: Uroteuthis chinensis, Sthenoteuthis oualaniensis, diet, COI, DNA barcoding, South China Sea, Shantou-Taiwan Shoal fishing ground

CLC Number: 

  • P735