厦门凤林红树林湿地自由生活海洋线虫群落的研究

2004年冬季在集美凤林类似底质类型、盐度和潮位的海湾地段4个断面,就不同红树植物林中的小型底栖动物数量和自由生活海洋线虫群落进行了研究。结果表明:海洋线虫是凤林红树林中小型底栖动物中的绝对优势类群,占到小型底栖动物的76.1%~96.3%;从丰度来看,旧区白骨壤(Avicennia marina)林中小型底栖动物的数量较少,有污水流过的光滩数量较大;4个断面共鉴定出海洋线虫37种(分类实体单元),其中新区秋茄(Kandelia candel)林中的生物多样性指数较低,旧区白骨壤林中群落具有较高的物种多样性;从出现的物种来看,新区秋茄林、旧区白骨壤林和光滩上出现的优势种和摄食功能群的类型各不相同。从4个断面13个站位进行的聚类分析和MDS标序分析结果推断自由生活海洋线虫的群落结构与不同的红树植物形成的沉积物有关。

The study on the community of free-living marine nematodes in Fenglin mangrove wetlands, Xiamen, China

The number of meiofauna and the community of free-living marine nematode were studied at Fen glin Site,Jimei District,Xiamen City,where there are different types of mangrove wih similar sediment type,salinity and tidal level.The samples were taken at four transect,13 sampling sites in winter 2004 The results showed that the free-living marine nematodes were the dominant group the percentage of which in the total number of meiofauna ranging betwean 76.1%~96.3%.The abundance of meiofauna in old mangrove(Avicennia marina) district was the least and in bare beach where waste water flows was the most There were a total of 37 putative species in the samples.The total number of recorded species was the lowest in the new mangrove district,and highest in the old mangrove district.The species diversity indexes,species evenness indexes and richness indexes in old mangrove district were all higher than those in new mangrove district.The dominant species and feeding types were different in three types of habitats.Cluster analysis using group average linking of Bray-Curtis similarities and MDS indicated that there was connection between community structure offree-living marine nematodes and the sediment produced by different types of mangroves.