湛江特呈岛红树林湿地冬季小型底栖动物和海洋线虫群落的初步研究

Preliminary study on meiofauna and marine nematode community in the mangrove wetland of Techeng Island,Zhanjiang in winter

于2018年冬季进行沉积物小型底栖动物样品采集,沿特呈岛红树林南部分布区域设5个采样断面,研究该红树林湿地中小型底栖动物类群组成及丰度、海洋线虫群落结构。结果表明:采样区域共发现5个小型底栖动物类群,其中海洋线虫为绝对优势类群,占总丰度的97.99%。小型底栖动物的丰度在(71.35±16.80)^(786.40±908.18)ind/10 cm^2之间,平均丰度为(432.25±500.84)ind/10 cm^2;不同断面、潮位之间小型底栖动物丰度差异显著。鉴定海洋线虫隶属于22个科44个属,优势属为Terschellingia、Sabatieria、Viscosia、Spirinia、Megadesmolaimus和Spilophorella,优势度分别为21.77%、8.43%、7.99%、7.99%、6.50%和5.79%。摄食类型,从属的数量和个体数量来看,沉积食性者都占优势。通过多样性和K-优势度分析,海洋线虫各项指数在断面3都是最高的;聚类分析和MDS标序分析表明,断面3和断面5在海洋线虫群落结构上较为相似。

Sample collection of sediment meiofauna was conducted in winter 2018.Five sampling sections were set along the southern distribution area of Techeng Island mangrove,and to study the composition and abundance of meiofauna in this mangrove wetland,as well as the community structure of marine nematodes.The results showed that five groups of meiofauna were found in the sampling area,among which marine nematodes were absolutely dominant group,accounting for 97.99%of the total abundance.The abundance of meiofauna was between(71.35±16.80)^(786.40±908.18)ind/10 cm^2,while the average abundance of meiofauna was(432.25±500.84)ind/10 cm^2.In different sections,there was a significant difference in the number of meiofauna groups among different sections and tidal levels.The marine nematodes were identified as belonging to 44 genera of 22 families.Terschellingia,Sabatieria,Viscosia,Spirinia,Megadesmolaimus and Spilophorella were the dominant genera with the number of greater than 5%,with the dominant degrees of 21.77%,8.43%,7.99%,7.99%,6.50%and 5.79%,respectively.In terms of the number of genera and individuals,the deposit feeders were dominant.Through diversity and K-dominance analysis,the marine nematode index in section 3 was the highest.Cluster analysis and MDS analysis showed that section 3 and section 5 were similar in community structure of marine nematodes.