Studies on the species composition and biodiversity of free-living marine nematodes in the southern Huanghai Sea

免费生活的海洋的线虫在 22stations 的一个格子被取样并且学习(从 32 ° 2 9.35 ′到 37 ° 0 .56 ′ N， 122 ° 0 .37 ′到 125 ° 1 .16 ′ E ) 在在 2003 年 1 月的南部的 HuanghaiSea。线虫丰富从 50.5 ～ 127.2 ind./cm~2 变化了[(83.1 ± 24.7 ) ind./cm~2 ] 在不同车站， 80.1% 全部的线虫在沉积的表面层(0 ～ 2 厘米) 。223 种或税一个 of 水兵属于 145genera， 32 个家庭和四目的线虫在 Huanghai 海被识别并且首先记录了。Thecommon 优势种是 Dorylaimopsis rabalaisi， Terschellingia longicaudata， Sphaerolaimusbalticus， Metalinhomoeus longiseta， Quadricoma 扫描集成通信适配器， Prochromadorella sp， Paramonohysterariemanni， Marylynnia sp.1， Vasostoma spiratum， Halalaimus spp， Pierrickia sp.1 和 Promonhysterafaber。线虫差异与沉积颗粒度被相关。皮尔森相关分析证明那个 Shannon 牛肉熏香肠索引与有一个淤泥泥土内容的一个沙内容和否定关联有高度重要的积极关联(P < 0.01 ) ；种类丰富索引(d) 与有 silt-claycontent 的沙内容和否定关联有重要积极关联(P < 0.05 ) 。南部的 Huanghai 海的差异在中心 ofBohai 海是比那低的，但是优势更高。

Free-living marine nematodes were sampled and studied at a grid of 22 stations （from 32°29.35′ to 37°0.56′N, 122°0.37′ to 125°1.16′ E） in the southern Huanghai Sea in January 2003. Nematode abundance varied from 50.5 to 127.2 ind./cm^2 [（83.1 ±24.7） ind./cm^2] at different stations, 80.1% of the total nematodes were in the surface layer （0-2 cm） of sediments. Two hundred and twenty-three species or taxa of marine nematodes belonging to 145 genera, 32 families and four orders were identified and first recorded in the Huanghai Sea. The common dominant species were Dorylaimopsis rabalaisi, Terschellingia longicaudata, Sphaerolaimus bolticus, Metalinhomoeus longiseta, Quadricoma scanica, Prochromadorella sp., Paramonohystera riemanni, Marylynnia sp. 1, Vasostoma spircaum, Halalaimus spp., Pierrickia sp. 1 and Promonhystera faber. Nematode diversity was correlated with sediment granularity. Pearson correlation analysis showed that Shannon-Wiener index had highly significant positive correlation with a sand content and negative correlation with a silt-clay content （P〈0.01）; species richness index （d） had significant positive correlation with the sand content and negative correlation with the silt-clay content （P〈0.05）. The diversity of the southern Huanghai Sea was lower than that in the center of Bohai Sea, but the dominance was higher.