南沙珊瑚礁区波纹钩鳞鲀(Balistapus undulatus)食性和营养级分析

doi:10.11978/2021008

Abstract

Abstract:

As an omnivorous and widespread fish in tropical coral reefs, Balistapus Undulatus is an important sea urchins predator according to previous observations. However, the accurate food composition and ecological function of B. Undulatus remain unclear due to the lack of food composition information in natural environment. Here, we studied samples of triggerfish collected from the coral reef of Nansha in the summer of 2017. We used the high-throughput sequencing method targeted on the Cytochrome c. Oxidase subunit I (COI) gene and stable isotopes method to analyze the gut content composition of B. Undulatus, and conducted trophic levels analysis. Thirteen species were detected, including Arthropoda, Chordata and Annelida. Crabs of the Xanthidae family were the most important food item, such as Etisus sp., Luniella pubescens and Liomera rugata, accounting for 61.8%, 6.7% and 1.8%, respectively. Fish also made a contribution, accounting for 23.5% of the total food sequence. The isotopic results show that the trophic level was 3.71±0.07, which was consistent with the results of molecular detection. The results show that the main food of triggerfish (B. Undulatus) was small crustaceans and herbivore parrotfish. This study deepens our understanding of the ecological role of triggerfish.

Key words: Balistapus undulatus, diet, high-throughput sequencing, stable isotope, trophic level, coral reef

CLC Number:

P735.12

ZHANG Chen, HU Simin, LIN Xianzhi, ZHOU Tiancheng, HUANG Hui, LIU Sheng. Diet and trophic level analysis of triggerfish (Balistapus undulatuse) in coral reefs of Nansha[J].Journal of Tropical Oceanography, 2022, 41(1): 7-14.

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References 30

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编号	体重/g	体长/cm	饱食度	消化道内容物	高通量测序	同位素分析	δ¹⁵N值/‰	δ¹³C值/‰	营养级
Balun1	118.5	14.0	30%	海胆棘刺	√	√	8.94	-15.70	3.63
Balun2	120.9	14.0	20%	-	√	√	9.60	-15.96	3.82
Balun3	97.9	12.5	20%	贝、螺	√	√	9.13	-16.95	3.69
Balun4	60.1	10.5	30%	贝、头足类	√
Balun5	188.6	15.3	50%	大型藻类	√	√	9.18	-16.08	3.70
Balun6	157.7	14.0	60%	蟹、螺、海胆、藻类	√	√	9.15	-15.79	3.69
Balun7	93.6	12.0	40%	沙子、贝、海胆	√

Diet and trophic level analysis of triggerfish (Balistapus undulatuse) in coral reefs of Nansha

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