Journal of Tropical Oceanography ›› 2025, Vol. 44 ›› Issue (3): 104-120.doi: 10.11978/2024207CSTR: 32234.14.2024207

• Marine Biology • Previous Articles     Next Articles

Zooplankton community structure and fecal carbon flux in the seaweed Sargassum beds of Weizhou Island, Guangxi, based on morphological and environmental DNA metabarcoding

LI Jieli(), ZOU Ligong, YANG Yufeng, WANG Qing()   

  1. Department of Ecology, Key Laboratory of Philosophy and Social Science in Guangdong Province, Jinan University, Guangzhou 510632, China
  • Received:2024-11-15 Revised:2024-11-26 Online:2025-05-10 Published:2025-06-04
  • Contact: WANG Qing
  • Supported by:
    National Natural Science Foundation of China(32271684)

Abstract:

In order to analyze the effect of seaweed on zooplankton community structure and its fecal carbon flux, a survey of zooplankton community structure was carried out in the Sargassum beds of Weizhou Island and its adjacent waters, Guangxi, in March, May and June 2024, and zooplankton fecal carbon flux was also estimated. When Sargassum bloomed in May 2024, the zooplankton community structure was examined by two types of environmental DNA metabarcoding (18S rDNA and COI gene). A total of 45 zooplankton species, including 38 copepods, were identified by morphology during the survey period. The zooplankton abundance varied from 1160~3960 ind.·m-3, with the zooplankton species and abundance identified in the Sargassum beds being higher than that of its adjacent waters (P<0.05). There were marked differences in the composition of zooplankton species identified by morphology, 18S rDNA and COI gene, with more copepods identified by morphology, more ciliates detected by 18S rDNA, and more medusa species detected by COI gene. The only species detected by all three methods was Temora turbinata. Zooplankton fecal carbon flux varied from 0.215~0.574 mg C·m−2·d−1, and the zooplankton fecal carbon flux in the Sargassum beds were higher than that in its adjacent waters. The results showed that the growth of Sargassum can improve zooplankton diversity and increase zooplankton abundance and fecal carbon flux.

Key words: Weizhou Island, Sargassum beds, zooplankton, environmental DNA, fecal carbon flux

CLC Number: 

  • Q958.8