Studies On Responses Of Marine Nematode Community To Crude Oil Contamination In Intertidal Zone Of Bathing Beach, Dalian Bay

This article aimed to do in-depth research about the species of free-living marinenematodes, cummunity structure and its relationship with environment variables, which livingin the intertidal zone. In order to provide necessary science data for the marine environwentmonitoring and the petroleum pollution impact on marine nematodes. The results showed that:A total of85genera of free-living marine nematodes, belonging to27families and3orders,were identified in CS (control site). The dominant genera in the sampling area are:Metoncholaimus， Mesacanthion， Sphaerolaimus， Metadesmolaimus， Aconthonchus，Marylynnia，Paramesacanthion，Nannolaimus，Neotonchoides，Leptolaimus，Halalaimus，Terschellingia，Chromadorina， Mesacanthoides and so on. A total of67genera offree-living marine nematodes, belonging to23families and3orders, were identified in PS(polluted sites). The dominant genera in the sampling area are: Metoncholaimus，Metadesmolaimus，Marylynnia，Aconthonchus，Gammanema，Choniolaimus，Leptolaimus，Chromadorina，Dorylaimopsis and so on. There were8same advantage genus, differentoccasional species and rare species, Epigrowth feeders (2A) were dominant by total genusnumber and relative abundance in CS and PS. Species of Marylynnia present positivecorrelation to TPH. The environment variables and marine nematodes are significantlydifferent in CS and PS, and the main factors of environmental differences is the TPH(petroleum hydrocarbons).TPH present positive correlation to water content, organic carbon,salinity and pH; TPH present negative correlation to biomass, total nitrogen, EH, sand andtotal phosphorus. The environment factors was significantly relatied to the nematodecommunity structure in CS and PS, therefore, TPH will indirectly affect marine nematodescommunity structure by organic carbon, salinity, pH, EH and sand.