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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (6): 2028-2034.doi: 10.13287/j.1001-9332.202106.009

• Special Features of Stable Isotope Ecology • Previous Articles     Next Articles

Food web in jellyfish-shrimp-shellfish polyculture pond

WANG Bai, TIAN Jia-shen, ZHOU Zun-chun*   

  1. Liaoning Ocean and Fisheries Science Research Institute, Liaoning Province Key Laboratory of Marine Biological Resources and Ecology, Dalian 116023, Liaoning, China
  • Received:2021-01-05 Accepted:2021-04-14 Published:2021-12-15
  • Contact: * E-mail: zunchunz@hotmail.com
  • Supported by:
    Liaoning Revitalization Talents Program (XLYC1802091), the Entrepreneurship Program for High-level Talent of Dalian (2017RQ159), the Liaoning Ocean and Fishery Department Program (201823) and the Doctoral Scientific Research Start Fund of Liaoning Province (2020-BS-297).

Abstract: To analyze the feeding habits and trophic level of jellyfish (Rhopilema esculentum), Chinese shrimp (Fenneropenaeus chinesis), grass shrimp (Penaeus monodon), and clam (Ruditapes philippinarum), and the food web structure in marine aquaculture pond, we measured the δ13C and δ15N values of the four species and different feed from May to September in 2017. The average proportional contribution of different feed to the four species were analyzed using the IsoSource linear mixture model. The results showed that zooplankton was the main food source to jellyfish, Engraulis japonicus was the main food source to the two shrimp species, and the phytoplankton, benthic diatoms and dejecta of the two shrimp species were the main food source to the clam. The trophic level of the clam ranged from 2.64 to 2.95, with a mean value of 2.84. The trophic level of jellyfish ranged from 2.78 to 3.27, with a mean value of 3.06. the grass shrimp ranged from 3.03 to 3.54, with a mean value of 3.25. The trophic level of Chinese shrimp ranged from 3.76 to 4.40, with a mean value of 3.95. Results of comprehensive analysis showed that the clam was the primary consumer, jellyfish was the secondary consumer, and shrimps were the predators. Jellyfish filtered the dejecta of the two kinds of prawns and improved water quality of the polyculture pond to a certain extent.

Key words: stable isotope, polyculture pond, food web