Preliminary study on the trophic relationship of dominant fishes in coral reefs of Weizhou Island in autumn

Peng Qian; Wang Qifang; Song Puqing; Huang Dingyong; Zhang Han; Wang Jianjia; Zheng Xinqing

doi:10.12284/hyxb2023128

Volume 45 Issue 9

Sep. 2023

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Peng Qian，Wang Qifang，Song Puqing, et al. Preliminary study on the trophic relationship of dominant fishes in coral reefs of Weizhou Island in autumn[J]. Haiyang Xuebao，2023, 45(9)：91–104 doi: 10.12284/hyxb2023128

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Preliminary study on the trophic relationship of dominant fishes in coral reefs of Weizhou Island in autumn

doi: 10.12284/hyxb2023128

1.
College of Marine Science, Shanghai Ocean University, Shanghai 201306, China
2.
Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf, Third Institute of Oceanography, Ministry of Natural Resources, Beihai 536007, China
3.
Key Laboratory of Marine Ecological Conservation and Restoration, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Received Date: 2023-02-13
Rev Recd Date: 2023-05-04

Available Online: 2023-09-05

Publish Date: 2023-09-30

Abstract

Abstract

Here, stable carbon and nitrogen isotope (δ¹³C and δ¹⁵N) techniques are used to estimate the trophic levels (TL) and main carbon sources of the dominant fish in the coral reefs of Weizhou Island in autumn. Combined with the six quantitative indicators of community trophic structure, the trophic relationship of the dominant fish in the coral reefs of Weizhou Island in autumn is preliminarily analyzed. The results show that the δ¹³C and δ¹⁵N values of different fishes are significantly different (p < 0.01). The δ¹³C values are between −18.3‰ and −15.4‰, and the δ¹⁵N values are between 12.9‰ and 16.3‰. The trophic levels of fish ranged from 2.5 to 3.4, with an average values of 3.0 ± 0.8, indicating that fish in Weizhou Island are mainly carnivorous. The organic carbon sources of fish in Weizhou Island are complex, but macroalgae and benthic microalgae are the key carbon sources fuelling fish food webs. The food source diversity level and trophic level length (CR and NR) of fish community are 2.35 and 3.09, respectively. The total area (TA), mean centrifugal distance (CD), mean nearest neighbor distance (MNND) and standard deviation of nearest neighbor distance (SDNND) are 4.48, 0.89, 0.40 and 0.29, respectively. These above indicators suggest that the trophic structure of coral reef fish community in Weizhou Island has a high degree of nutritional redundancy, but the food chain is short and the nutritional diversity is low. The coral reef ecosystem in Weizhou Island is incomplete in food web structure. In the future, it is necessary to carry out appropriate control and restoration measures to restore the structure and function of the coral reef ecosystem in Weizhou Island.
- coral reef fish,
- trophic relationship,
- carbon and nitrogen stable isotope,
- Weizhou Island

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References(61)

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