摘要
根据2021年4月至2022年1月4个航次渔业资源和环境数据调查资料,对瑞安海域三疣梭子蟹(Portunus trituberculatus)时空分布及其与影响因素的关系进行研究,包括其海域优势度、群落结构组成、资源密度分布等,同时运用广义可加模型(GAM)分析了资源密度与影响因素的关系。结果表明:瑞安海域中,三疣梭子蟹在春季和夏季为重要种(100≤IRI <1 000),在秋季和冬季为优势种(IRI≥1 000)。三疣梭子蟹平均甲长范围为33.9~60.4 mm,平均体重范围为22.9~126.1 g,甲长和体重均以夏季最高,秋季最低,不同季节间三疣梭子蟹甲长和体重呈现显著性差异。三疣梭子蟹在春季、夏季和冬季均呈现负异速增长(b <3),秋季呈现正异速增长(b> 3)。三疣梭子蟹平均资源密度范围为16.57~422.60 kg/km^(2),平均资源密度呈现以秋季最高,春季最低,秋季是春季的25.5倍。GAM分析表明,模型解释率为80.2%,季节、表层水温、底层水温、底层盐度和表层叶绿素a浓度对三疣梭子蟹资源密度具有显著影响(p <0.05),其中季节影响最大。通过本研究,为掌握瑞安海域三疣梭子蟹资源动态变化规律提供了参考,进而为三疣梭子蟹增殖放流提供理论支撑。
Based on the survey data of fishery resources and environment of four voyages from April 2021 to Janu-ary 2022,the spatial and temporal distribution of Portunus trituberculatus and its relationship with influencing factors in the Ruian sea area were studied,including its marine dominance,community structure and resource dens-ity distribution.At the same time,generalized additive model(GAM)is used to analyze the relationship between re-source density and influencing factors.The results showed that:in the Ruian sea area,P.trituberculatus is an im-portant species(100≤IRI<1000)in spring and summer and a dominant species(IRI≥1000)in autumn and winter.The average carapace length and body weight of P.trituberculatus ranged from 33.9 mm to 60.4 mm,and 22.9 g to 126.1 g.The carapace length and body weight of P.trituberculatus were the highest in summer and the lowest in autumn.There were significant differences between different seasons.P.trituberculatus showed negative allometric growth in spring,summer and winter(b<3),and positive allometric growth in autumn(b>3).The aver-age resource density of P.trituberculatus ranged from 16.57 kg/km^(2) to 422.60 kg/km^(2),with the highest in autumn and the lowest in spring,and the average resource density in autumn was 25.5 times of that in spring.GAM analys-is showed that the interpretation rate of the model was 80.2%.Season,surface water temperature,bottom water tem-perature,bottom salinity and surface chlorophyll a concentration had significant effects on the resource density of P.trituberculatus(p<0.05),among which season had the greatest effect.Through this study,it provides reference for grasping the dynamic change law of P.trituberculatus resources in Ruian sea area,and further provides theoret-ical support for the proliferation and release of P.trituberculatus.
作者
徐国强
徐开达
王好学
周永东
Xu Guoqiang;Xu Kaida;Wang Haoxue;Zhou Yongdong(Zhejiang Marine Fisheries Research Institute,Zhoushan 316021,China;Scientific Observing and Experimental Station of Fishery Re-sources for Key Fishing Grounds,Ministry of Agriculture and Rural Affairs,Zhoushan 316021,China;Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province,Zhoushan 316021,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2024年第3期66-74,共9页
基金
国家重点研发计划项目(2019YFD0901204)
瑞安海域渔业资源本底调查与增殖放流效果评价项目(01042006)。
关键词
瑞安海域
三疣梭子蟹
资源密度
时空分布
影响因素
Ruian sea area
Portunus trituberculatus
resource density
spatial and temporal distribution
influencing factors
