福建近岸海域鱼类群落结构及资源现状OA北大核心CSTPCD

In order to ascertain the fish community in the coastal waters of Fujian,this study carried out four surveys in the coastal waters of Fujian in May(spring)and November(autumn)in 2022,February(winter)and July(summer)in 2023.Quarterly bottom trawl sampling surveys analyzed the species composition,floristic characteristics,dominant species,diversity,and degree of community disturbance of fish in the sea area,and elaborated on the group structure of fish communities.A total of 200 species of fish were collected in this study,belonging to 22 orders,80 families,and 149 genera.The suitable temperature type is mainly warm water(accounting for 75％),and the fauna type is mainly bottom fish(accounting for 47.50％).The average mass density of fish is 687.16 kg/km2,which is highest in summer and lowest in winter;the average abundance is 42 909.10 ind./km2,which is highest in autumn and lowest in winter.There are 14 dominant species in each quarter,among which Trichiurus japonicus is the dominant species throughout the year.The Margalef index(D)of fish is the highest in autumn,while the Shannon-Wiener index(H')is the lowest.The Pielou index(J')does not change much throughout the year,and the peak value appears in winter.Cluster analysis showed that the fish community in the coastal waters of Fujian can be clearly divided into two types of fish communities:northern coastal and southern coastal fish communities,and there are significant differences in community species composition among different regions in each season.Quantitative biomass curves showed that fish communities are moderately disturbed in spring and severely disturbed in summer,autumn,and winter.