서태평양에서의 독립영양생물 미세조류의 분포 - 축라군에서부터 동중국해까지

Abstract

Autotrophic picoplankton distribution was investigated from Chuuk Lagoon(FSM)to the coastal waters of Korea (Inner Chuuk Lagoon(IC), outer Chuuk Lagoon(OC),North Equatorial Current(NEC), Kuroshio current(KC), East China Sea(ECS)).Prochlorococcus(PRO), Synechococcus(SYN), picoeukaryotes(PEUK) were andenumerated using Flow Cytometry. Diversity and type distribution of picoeukaryotes were analyzed through 18S rRNA gene sequencing. Importance of autotrophic picoplankton biomass was assessed using size fractionated chlorophyll a analyses. 3um size fractionated chlorophyll a contributed more than 50% for most part indicating their importance as primary producers in these regions. PRO were the most abundant autotrophic picoplankton in the surface waters but not observed in the IC and ESC shelf waters. High abundances of surface SYN were observed in IC and ECS, but lower abundances were enumerated in NEC and KC. PEUK in OC and ECS showed a characteristics of having abundance maximum whereas NEC showed mixed surface layer. PEUK showed that the whole study areas have novel alveolate group and dinophyceae as a dominant group. The current study tries to understand how the changes in environmental variables effect autotrophic picoplankton distribution in the Western Pacific.