Studies On Meiofauna Ecology And Taxonomy Of Free-living Nematodes From The Jiaozhou Bay

To study the taxa composition,samples were collected from the Jiaozhou Bay in various stations in the summer of 2015 and 2016.Then on the basis,we also studied the diversity,species composition,taxonomy of free-living nematodes in the zone of Jiaozhou Bay.As the result as we can know that the average abundance and biomass of meiobenthos which we studied were 2651 ±707(ind · l0 cm^-2)and 1284.8±423.5(?gdwt·10 cm^-2)respectively.There are eleven kinds of meiofauna were selected,such as free-living nematodes,copepods nematodes,and in abundance free-living nematodes was the most dominant group?95.7%?.The average abundance and biomass of the free-living nematodes which selected from meiofauna we studied were 2537.8± 676.0(ind · l0 cm^-2)and 1015.1±270.6(?gdwt·10 cm^-2).In biomass,free-living nematodes was the most dominant group?79.2%?,and followed by copepods?10.8%?,polychaetes?5.9%?and bivalve?2.0%?,etc.As to vertical distribution,there were 56.5% and 53.1% of meiobenthos and nematodes distributed in the surface 0-2cm layer respectively.This research area,including four intertidal station and 16 shallow stance?5.5-5.5 meters?,the benthic environment of the most stance is relatively unstable,nematodes distributed in 0-2 cm and 2-8 cm layers almost evenly.In this paper,we identified 198 kinds of free-living nematodes from the Jiaozhou Bay,and they belonged to 87 genera,27 families and 4 orders.We also found that the nematodes composition varied among different stations,such as JZW-8?85?and JZW-10?26?.The dominant populations in this study contained Parodontophora marina Zhang,1991,Terschellingia longicaudata De Man,1907,Dorylaimopsis turneri Zhang,1992,Setosabatieria coomansi Huang et Zhang,2006,Leptolaimus sp1,Sphaerolaimus gracilis De Man,1884?Among the identified free-living nematodes,one new genus?Ptycholaimelloides gen.nov.?was established,five new species?Ptycholaimelloides qingdaoensis sp.nov.,Dorylaimopsis hetoroapophysis sp.nov.,Sabatieria macrospicula sp.nov.,Sabatieria macrospicula sp.nov.,Wieseria zhoui sp.nov.?and twenty new records were described.In addition,this study provided a complete list of nematodes which have identified to species.