A flow cytometric study of autotrophic picoplankton in the tropical eastern Pacific SCOPUS KCI

A flow cytometric study of autotrophic picoplankton in the tropical eastern Pacific
Noh, J.-H.; Yoo, S.-J.; Lee, M.-J.; Son, S.-K.; Kim, W.-S.
KIOST Author(s)
Noh, Jae Hoon(노재훈)Lee, Charity Mijin(이미진)Son, Seung Kyu(손승규)
Publication Year
The effects of environmental forcing on autotrophic picoplankton distributional patterns were investigated for convergence (5°N), divergence (9°N-10°30′N) and oligotrophic (17°N) sites in the tropical eastern Pacific during 2001 and 2003 KODOS (Korea Deep Ocean Study) cruises. The distributions of picoplankton populations - Prochlorococcus, Synechococcus and picoeukaryotes algae - were determined by flow cytometric analyses. Latitudinal variations in abundance maxima, vertical profiles, integrated abundance (0-150 m), and estimated carbon biomass were contrasted for each site according to three hydrological conditions. Prochlorococcus showed consistently high abundance in the surface mixed layers of all sites at 1 × 105∼3 × 105 cells ml-1 and showed declining abundance below these layers. However, these decreasing rates were not particularly sharp showing considelrably high abundance at 1 × 104 cells ml-1 or higher even at 100 m depth. Vertical profiles of Synechococcus and picoeukaryotes were generally parallel to each other in all sites. A clear abundance maximum was observed at divergence site at or slightly above the pycnocline depth. Higher abundance was observed at the surface mixed layer for convergence site but a sharp decrease was observed below the pycnocline. However, there was no significant abundance fluctuation with depth at more oligotrophic site (17°N). Integrated cell abundance of Prochlorococcus was high in the oligotrophic site at 2.17 × 1013 cells m-2, and low in the convergence site at 0.88 × 1013 cells m-2. However, opposite pattern was observed for Synechococcus and picoeukaryotes where relatively high integrated cell abundance was shown in the convergence site. Estimated carbon biomass of Prochlorococcus contributed 30.4-80.3% of total autotrophic picoplankton carbon showing the highest contribution in the oligotrophic site and the lowest contribution in the convergence site. Synechococcus contribution of total autotrophic picoplantkon carbon biomass was lower than 5.8% for most of sites except the convergence site where Synechococcus contributed 23.2% of picoplankton carbon biomass. Carbon biomass of picoeukaryotes was 18.8-46.4% showing the highest carbon biomass at the convergence site. Overall, Prochlorococcus showed higher cell abundance and carbon biomass and exhibited different reaction to hydrological conditions when compare with the other two major autotrophic picoplankton groups.
Bibliographic Citation
Ocean and Polar Research, v.26, no.2, pp.273 - 286, 2004
Korea Ocean Research and Development Institute
abundance; biomass; environmental conditions; oligotrophic environment; picoplankton; population distribution; pycnocline; vertical profile; Pacific Ocean; Pacific Ocean (Tropical); algae; Prochlorococcus; Prochlorococcus; Synechococcus; Synechococcus; Viscum; Viscum album
Cell abundance; Convergence; Divergence; Flow cytometer; Oligotrophic; Picoplankton
Document Type
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

Marine Eco-Environment,Ocean legal regime/ocean policy/Ocean S&T,International Strategic Network,해양환경생태,해양법/해양정책/해양과학,전략적 국제네트워크

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