Daily variation in the prokaryotic community during a spring bloom in shelf waters of the East China Sea.

Dong Han Choi,Jaeseol Shim,Howon Lee,Sung Min An,Jae Hoon Noh,Jinyong Jeong,Eun Chan Yang

doi:10.1093/femsec/fiy134

Dong Han Choi, Jaeseol Shim + Show 5 more

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https://doi.org/10.1093/femsec/fiy134

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Abstract

ABSTRACTTo understand prokaryotic responses during a spring bloom in offshore shelf waters, prokaryotic parameters were measured daily at a station located in the middle of the East China Sea over a six-week period from March 25 to May 19. The site experienced a phytoplankton bloom in late April, triggering changes in prokaryotic abundance and production after a lag of approximately one week. Before the bloom, changes in prokaryotic composition were small. Both during the bloom and in the post-bloom period, successive changes among bacterial groups were apparent. A SAR11 group became more dominant during the bloom period, and diverse groups belonging to the Flavobacteriia occurred dominantly during both the bloom and post-bloom periods. However, bacterial community changes at the species level during the bloom and post-bloom periods occurred rapidly in a time scale of a few days. Especially, NS5, NS4 and Formosa bacteria belonging to Flavobacteriia and bacteria belonging to Halieaceae and Arenicellaceae families of Gammaproteobacteria showed a successive pattern with large short-term variation during the period. The changes in prokaryotic composition were found to be related to phytoplankton biomass and composition, as well as seawater temperature and variations in nutrients.

Highlights

Algal blooms typically develop in the spring in temperate midlatitude seas and are mainly triggered by a combination of higher light intensity/duration, nutrient levels, sea surface temperature and water column stratification (Smetacek and Cloern 2008; Taylor and Ferrari 2011)
To understand prokaryotic responses during a spring bloom in offshore shelf waters, prokaryotic parameters were measured daily at a station located in the middle of the East China Sea over a six-week period from March 25 to May 19
Bacterial composition changes along bloom phases, as several genera belonging to Roseobacter, Flavobacteriia and Gammaproteobacteria were shown to consecutively dominate during spring bloom events (Riemann, Steward and Azam 2000; Teeling et al 2016)

Summary

Introduction

Algal blooms typically develop in the spring in temperate midlatitude seas and are mainly triggered by a combination of higher light intensity/duration, nutrient levels, sea surface temperature and water column stratification (Smetacek and Cloern 2008; Taylor and Ferrari 2011). These environmental changes influence subsequent autotrophic and heterotrophic microbial growth, and result in changes in nutrients and organic matter conditions during the bloom. Algal composition and succession are the most important factors in determining the subsequent responses of prokaryotes during blooms

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