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| 1 | 冬季大连砂质潮间带自由生活海洋线虫群落结构及多样性的比较显示文摘本研究于2015年12月在濒临渤海的大连夏家河子沙滩和濒临黄海的大连金沙滩采集海洋线虫样品,对两处砂质潮间带海洋线虫群落结构及多样性特征进行了研究。研究结果表明,两处砂质潮间带海洋线虫丰度、优势种、摄食结构及多样性差异显著。夏家河子海洋线虫平均丰度为(592.0±318.9)ind./(10 cm^(2)),金沙滩海洋线虫平均丰度为(54.6±53.8)ind./(10 cm2),显著低于夏家河子。共鉴定海洋线虫43种,共有种13个。夏家河子沙滩海洋线虫优势种为Daptonema sp.1、Daptonema sp.2、Theristus sp.1、Setosabatieria sp.1、Prochromadorella sp.1、Daptonema sp.3、Paracyatholaimus sp.1、Sabatieria breviseta,以非选择性沉积食性线虫为主;金沙滩海洋线虫优势种为Oncholaimus sp.1、Chromadorita sp.1、Theristus sp.2,Neochromadora sp.1、Enoplus sp.1、Prochromadorella sp.1,以杂食性或捕食性线虫为主。两处砂质潮间带海洋线虫种数S、丰富度指数d和香农−威纳多样性指数H'存在极显著的差异,其值均表现为夏家河子显著高于金沙滩。相似性分析结果显示,两处沙滩的海洋线虫群落结构存在显著差异。间隙水pH、沉积物有机质含量及中值粒径是引起海洋线虫群落结构及多样性差异的主要因子,其中,沉积物中值粒径对线虫群落特征的影响最为突出。就两处沙滩潮区差异而言,受沉积物粒径特征及pH的影响,夏家河子海洋线虫群落特征在不同潮区之间也存在差异,其低潮带海洋线虫多样性高于高、中潮带,杂食者和捕食者丰度高,反映其海洋线虫群落结构较复杂。金沙滩不同潮区的环境因子无显著差异,线虫群落结构及多样性潮区差异不显著,较为均一。此外,水动力对海洋线虫群落结构沙滩差异和潮区差异也产生重要影响。一方面,水动力通过影响不同粒径沉积物的沉积影响海洋线虫群落特征;另一方面,水动力可影响线虫的分散性,进而对其潮区分布产生影响。 | 宋慧丽 慕芳红 孙燕 华尔 | 2021 | 海洋学报2021，43，8： | 2 |
| 2 | Taxonomic Composition and Spatial Distribution of Meiofauna Community from a Sandy Intertidal Zone in Sishili Bay, Yellow Sea Coast (Northern China)显示文摘The meiofauna composition and trophic groups of the nematode communities have been studied at a sandy intertidal zone in Sishili Bay along the Yantai coast(Yellow Sea,China).Nematoda was dominant among the 11 groups of meiofauna.The meiofaunal densities were low,ranging between 111±47 and 542±131 ind./10 cm^(2).Results obtained from the correlation analysis made it possible to determine several factors that influence species composition and distribution.Generally,sediment granulometry significantly affected the communities.The highest abundance was found in fine-grained sediments(318.77±126 ind./10 cm^(2))com-pared to coarse-grained sediments(175±82 ind./10 cm2).Nematodes were predominant in all studied sites.A total of 70 species be-longing to 52 genera and 18 families were identified in the study area.There was a significant difference in nematode abundance(ANOVA,F=2.38,P<0.05)between the three sites.Nematode communities were characterized by a high level of species diversity in sediments composed mainly of very-fine sands(>63μm),with dominant species belonging to the genus Bathylaimus,Ptycho-laimellus,Spirinia,and Sabatieria.The trophic groups were dominated by non-selective deposit feeders(40.7%)and epistrate feed-ers(41.29%).In contrast,the species composition in medium grain sands was characterized by a low species diversity index and a high Simpson dominance index.Nematode communities showed similar dominant species compositions belonging to a single genus Bathylaimus,Enoplolaimus,and Oncholaimus,and in terms of trophic structure-representatives of deposit feeders(46.15%),preda-tors,and omnivores(64.71%)prevailed.The divergence of meiofaunal community structures can be explained by abiotic factors such as sediment grain size,salinity,and organic carbon content.Specifically,sediment particle size can explain the diversity of nematodes at the level of in abundance,diversity indices,and trophic structure.The highest nematode density and diversity coincided with the highest percentage of very fine sands. | PAVLYUK Olga N TREBUKHOVA Yulia A SHCHERBAKOV Ilya A TARASOVA Tatiana S LUTAENKO Konstantin A CHEN Linlin SONG Bo LI Xiaojing LI Baoquan | 2022 | Journal of Ocean University of China2022，21，5： | 0 |
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