Studies On Zoology Of Meiofauna And Taxonomy Of Nematodes In Sublittoral Zone Of The East China Sea

To study the meiofauna taxa composition, abundance, biomass, spatial distribution were collceted, undisturbed sediments of 18 stations in the East China Sea in autumn(October 2012). The community structure, diversity and taxonomy of free-living marine nematode were also studied. The results show that the average abundance and biomass of benthic animals were 789±221 inds.10 cm-2 and 914.4±441.8 ?g dwt·10cm-2. Both the abundance and biomass were irregular all over the trend from the north to the south and from the inshore to the offshore, decreased from the near shore to about 124° E, and increased with the increasing of water depth. During our study, twelve meiobenthic groups were identified. Free-living nematodes was the dominant group in abundance with a relative dominance of 89.5%. In terms of biomass, polychaeta was the most abundant one(44.7%), followed by nematodes(30.9%), ostracods(9.7%) and copepods(4.7%) and so on. As to vertical distribution, there were about 57.7% of the total meiobenthos individuals and 56.4% of nematodes distributed in the surface 0–2 cm layer. CLUSTER analysis showed that the meiobenthos can be classified into a communtity.The average abundance and biomass of nematodes were 707±215 inds·10 cm-2, 282.6±86.0 ?g dwt·10cm-2 at total 18 stations in the East China Sea of 2012 voyage. A total of 310 species were identified, belonging to 133 genera, 29 families, 4 orders. The difference of species composition varied greatly in differenttations. The main dominant species were Sabatieria paradoxa Zhang, 1992, Dorylaimopsis rabalaisis Zhang, 1992, Parodontophora marina Zhang, 1991, Comesa warwicki Platt, 1982 and so on. In feeding type, deposit feeders(1A+1B) were for advantage ones(number of species accounted for 58.8%, individual number 56.0%); junior individuals accounted for 29.0% of the nematode population; the proportion of male and female average 1.5:1. The diversity index of the nematode community was similar to the distribution of the meiofauna.Among the identified 310 species of free-living nematodes, published one new genus(Paragnomoxyala Jiang & Huang, 2015), one specie(Paragnomoxyala breviseta Jiang & Huang, 2015), discovered and described seven new species(Paragnomoxyala minuta sp. nov., Elzalia bifurcata sp. nov., Metacomesoma breviseta sp. nov., Terschellingia filicaudata sp. nov., Terschellingia stenocephala sp. nov., Litinium rotundicaudatum sp.nov., Cobbionema donghaiensis sp. nov.), and fourteen new records.