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Diurnal variability of Synechococcus abundance in Sagami Bay, Japan

DRS at CSIR-National Institute of Oceanography

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Title Diurnal variability of Synechococcus abundance in Sagami Bay, Japan
 
Creator Mitbavkar, S.
Saino, T.
 
Subject Diurnal variations
Abundance
Picoplankton
Cell division
 
Description Synechococcus, the most dominant picophytoplankton in coastal regions, exhibits diurnal variations in the open ocean. The aim of this study was to assess its short-term population dynamics and cell cycle phases through DNA analysis in a coastal region (Sagami Bay, Japan) by sampling at fixed intervals vertically across the euphotic zone. Day-to-day variations in physical processes such as mixing, induced by wind, and advective events played an important role in structuring Synechococcus population. Compared to sub-surface population, surface cells entered S phase earlier in the day and were arrested and accumulated in the S phase for a longer time suggesting an inhibitory effect by higher irradiance. Increase of G2-phase cells during the dark suggests progression of cells through S phase in absence of light. Although the length of G2-phase was not known, subsequent increase in G1-phase cells in the early morning and late evening suggests occurrence of two cohorts of cells which divided in the dark phase or late evening of the cycle. This study showed that the population responds differently across the euphotic zone depending on the physical structure of the water column and its cell cycle phases are controlled by the vertical irradiance availability
 
Date 2015-03-09T10:06:19Z
2015-03-09T10:06:19Z
2015
 
Type Journal Article
 
Identifier Hydrobiologia, vol.747(1); 2015; 133-145.
http://drs.nio.org/drs/handle/2264/4713
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2015] Springer.
 
Publisher Springer