西沙群岛长棘海星(Acanthaster solaris)繁殖生物学的初步研究

doi:10.11978/2023203

Abstract

Abstract:

The outbreak of the crown-of-thorns starfish (COTS, Acanthaster solaris) population has severely damaged coral reef ecosystems, leading to a significant impact on biodiversity. The knowledge of the reproductive characteristics of the COTS is crucial for predicting population outbreaks and scientific management strategies. In this study, the samples were collected from ten reefs in the Xisha Islands from May to July 2022, and a total of 928 individuals were conducted for the reproductive biology analysis. The results revealed that the body diameter (diameter, D) of the Xisha Islands ranges from 82 to 363 mm, the mean value was (217±45) mm, the body weight (weight, W) range was 16.89~1 003.98g, and the mean value was (224.69±123.6) g. The relationship between body diameter and weight followed a power function, expressed as W=3.357×10^-4D^2.48(R²=0.86), indicating allometric growth in the population. The sex ratio of male to female individuals was 1.22:1. The initial sexual maturity body diameter for female COTS was 206.38mm. Gonadal maturity was classified into four stages, with the highest gonadosomatic index (GSI) and egg diameter occurring in Stage Ⅱ, averaging (15.68±6.35)%and (1.27±0.32) mm, respectively. The absolute fecundity range was 174 720~11 317 560 eggs, with mean of (3 555 081±2 301 657) eggs, relative fecundity range was 2 176.65~23 851.30 eggs·g^-1, and the mean value was (10 581.89±4 213.73) eggs·g^-1. The relationship between absolute fecundity and body diameter exhibited a power function (F_a=0.028 8D^3.346, R²=0.67, P<0.01), and the relationship between relative fecundity and body weight exhibited a power function (F_a=2 588.38W^1.234, R²=0.73, P<0.01). Reproductive capacity in COTS was closely related to individual size. This study, for the first time, reveals the reproductive characteristics of COTS in the Xisha Islands during the summer, providing a scientific basis for understanding the population dynamics and outbreak mechanisms of COTS. The results are significant for formulating effective conservation measures for coral reef ecosystems.

Key words: Xisha Islands, Acanthaster solaris, sex ratio, fecundity

CLC Number:

Q958.8

LIU Jiehong, WANG Pengcheng, WANG Zhihao, XIA Wentong, XIE Songguang, SONG Yiqing. Preliminary study on the reproductive biology of crown-of-thorns starfish (Acanthaster solaris) in the Xisha Islands[J].Journal of Tropical Oceanography, 2024, 43(6): 160-169.

Figures/Tables 11

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采集日期	岛礁	岛礁坐标	样本数量
2022年5月17日	全富岛	16°34′29.47″N, 111°40′24.05″E	59
2022年5月20日	银屿	16°35′56.46″N, 111°42′7.27″E	43
2022年5月21日	羚羊礁	16°28′59.41N, 111°35′29.47″E	80
2022年5月21日	石屿	16°28′43.74″N, 111°35′45.82″E	64
2022年5月21日	珊瑚岛	16°33′7.06″N, 111°37′32.35″E	78
2022年5月24日	甘泉岛	16°30′40.44″N, 111°35′2.81″E	72
2022年5月25日	金银岛	16°27′35.25″N, 111°31′20.03″E	175
2022年7月22日	玉琢礁	16°19′24.37″N, 111°59′59.94″E	66
2022年7月25日	浪花礁	16°3′26.50″N, 112°29′3.04″E	115
2022年7月27日	东岛	16°40′5.85″N, 112°44′36.34″E	176

Preliminary study on the reproductive biology of crown-of-thorns starfish (Acanthaster solaris) in the Xisha Islands

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