Distribution and growth characteristics of Halophila beccarii in Tangjia Bay,Zhuhai,China

ZHANG Li; GUO Kangli; DANG Ersha; SUO Anning; HE Weihong

doi:10.13984/j.cnki.cn37-1141.2025.02.001

Abstract：In order to study the basic characteristics of endangered seagrass Halophila beccarii and its habitat in Tangjia Bay,Zhuhai City,we conducted field surveys in the region in the autumns of 2018 and 2020,and preliminarily discussed the water quality environment,macrobenthos community and the growth characteristics of the seagrass.Pearson correlation method was used to analyze the growth char-acteristics of seagrass and its relationship with environmental factors.In the surveys,we found that the average dry weight biomass of H.beccarii in Tangjia Bay in 2018 was 14.45±5.82 g/m2,and the ar-ea was 3.29 hm2.The average dry weight biomass of H.beccarii in Tangjia Bay in 2020 was 14.47±7.67 g/m2 with an area of 4.13 hm2.The degree of plaque increased,and the area decreased by about 45％compared with that of 2008.The dominant species and habit density of macrobenthos in the sedi-ments of the seagrass area have also changed significantly between 2018 and 2020;biomass declined.Through correlation analysis,we found that there was a close relationship between the growth mor-phology and environmental factors such as seawater soluble inorganic phosphorus(DIP)concentration and salinity;and there was a significant negative correlation between leaf size and salinity,and a signifi-cant positive correlation between coverage and salinity.The leaf length and leaf width increased with the increase of DIP concentration,showing the adaptability of seagrass to the environment.Due to poor water conditions,residual oyster piles and frequent human disturbance in the area,it is necessary to in-clude the Tangjia Bay seagrass bed in the scope of protection and management,and carry out corre-sponding dynamic monitoring and basic research.