广西防城港东湾红树林湿地春季小型底栖动物丰度与生物量

于2019年春季在广西防城港东湾红树林湿地,设置4个断面共13个站位采集沉积物样品,对小型底栖动物的类群组成、丰度和生物量进行研究。共鉴定出11个以上的小型底栖动物类群,分别为自由生活海洋线虫、桡足类、多毛类、寡毛类、介形类、等足类、双壳类、涟虫、海螨类、腹足类、枝角类和其他未鉴定类群;小型底栖动物总平均丰度为(10364±8012) ind·10 cm-2;线虫是绝对优势类群,占小型底栖动物总丰度的95.38%,平均丰度为(9886±7746) ind·10 cm^-2,其次为桡足类,占比为2.14%,平均丰度为(221±358) ind·10cm^-2;小型底栖动物的总平均生物量为(10502±7894)μg·10 cm^-2,各断面的生物量趋势依次为:断面3>断面2>断面1>断面4。

Abundance and biomass of meiofauna in spring in Dongwan mangrove wetland of Fangchenggang,Guangxi

In the spring of 2019,we collected sediment samples in four sections across 13 stations in the Dongwan mangrove wetland in Fangchenggang City,Guangxi,to investigate composition,abundance,and biomass of meiofauna.More than 11 meiofaunal groups were recorded,including free-living marine nematode,copepoda,polychaeta,oligochaeta,ostracoda,isopoda,bivalves,cumacea,halacaroidea,gastropods,cladocerans,and other unidentified groups.The mean abundance was(10364±8012)ind·10 cm^-2 across different sections.Nematodes were the absolutely dominant group,followed by copepods.The average abundance of nematodes was(9886±7746)ind·10 cm^-2,accounting for 95.38%of the total abundance of meiofauna,while that of copepods was(221±358)ind·10 cm^-2,accounting for 2.14%of the total.The mean biomass of meiofauna was(10502±7894)μg·10 cm^-2 across different sections,with the descending sequence of Section 3>Section 2>Section 1>Section 4.