Bacterial growth rate and the relative abundance of bacteria to heterotrophic nanoflagellates in the euphotic and disphotic layers in temperate coastal waters of Sagami Bay, Japan

Sugai, Youta; Tsuchiya, Kenji; Kuwahara, Victor S.; Shimode, Shinji; Komatsu, Kazuhiro; Imai, Akio; Toda, Tatsuki

doi:10.1007/s10872-016-0352-6

Cited by 7 publications

(8 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ara et al, 2011; Kuwahara et al, 2015). The details of the study area and the samplings of the SML and SSW are described by Sugai et al (2016, 2018).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

et al. 2020

Self Cite

View full text Add to dashboard Cite

The sea surface microlayer (SML), less than 1,000-μm uppermost layer of the ocean water column, is located at the air-sea interface and plays critical roles in global biogeochemical cycles and climate change through air-sea gas exchange. To clarify the significance of the dynamics of carbon monoxide (CO) in the SML, where active photochemical and biological processes are expected, in air-sea CO exchange, the production and consumption of CO in the SML and its sea-air emission were investigated in temperate coastal waters. In the SML, the light-normalized photochemical CO production rate was relatively high from spring to autumn (median: 2.57 nM [kWh m −2 ] −1 ) when relatively high absorbance of chromophoric dissolved organic matter (0.55 m −1 ) was observed. Biological CO consumption rate constant in the SML showed relatively high values from spring to autumn (mean ± standard deviation: 0.060 ± 0.010 h −1 ) during the period of relatively high water temperature (22.3 ± 2.7°C). The calculated sea-air CO flux (F) varied similarly to CO concentration in the subsurface water. Comparison among the production, consumption, and sea-air emission of CO in the SML suggests that biological consumption in the SML can be ignored in air-sea CO exchange throughout the year whereas photochemical production in the SML enhances F during summer under intense light, active biological production, and weak wind conditions. Further, seawater warming experiments found the tendency of the stimulation of biological CO consumption by water temperature increase from spring to autumn, which suggests negative but insignificant feedback on global warming. Plain Language SummaryThe uppermost layer of the ocean water column is called the sea surface microlayer (SML) whose thickness is less than 1 mm. Although the SML is critical in climate change due to its roles in air-sea gas exchange because the SML is located at the interface between the atmosphere and the ocean, the information on the effect of chemical and biological processes in the SML on air-sea gas exchange remains limited. In this study, we investigated the photochemical production and biological consumption of carbon monoxide (CO), an indirect greenhouse gas, in the SML of temperate coastal waters. By comparing with CO emission to the atmosphere, we revealed that CO consumption in the SML would not be significant enough to affect air-sea CO exchange throughout the year. On the other hand, CO production in the SML potentially enhances the emissions of CO from the ocean to the atmosphere during summer. Further, we experimentally examined the effect of the increase in water temperature on CO production and consumption in the SML assuming global warming and found that water temperature increase tends to stimulate CO consumption in the SML from spring to autumn. However, the feedback on global warming can be ignored.

show abstract

“…Ara et al, 2011; Kuwahara et al, 2015). The details of the study area and the samplings of the SML and SSW are described by Sugai et al (2016, 2018).…”

Section: Methodsmentioning

confidence: 99%

“…The details of the analyses of CDOM, chlorophyll (chl.) a , and bacteria are described by Sugai et al (2016, 2018). Briefly, for CDOM, seawater was filtered through 0.22‐μm pore size filters (Millex‐GV, Merck) under the dark condition.…”

Section: Methodsmentioning

confidence: 99%

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…SAR11 cells oxidise many labile, low-molecular-weight organic compounds and their small cells with periplasms and many substrate-biding proteins (SBPs) are likely to be superior competitors for low-molecular-weight DOM in oligotrophic ocean environments (Giovannoni 2017). Indeed, dissolved organic carbon (DOC) concentration increases during spring to summer and decreases during winter in the mixed layer of Sagami Bay (Sugai et al 2016), suggesting that the DOC dynamics and the succession from Flavobacteriales and Rhodobacterales to SAR11 are consistent. Their different ecological roles could separate their occurrences spatially and seasonally.…”

Section: Bacterial Communitymentioning

confidence: 99%

“…The planktonic community was also vertically uniform in winter when vertical mixing formed a uniform water column and abiotic environment, although there was a slight time lag between the eukaryotic community (November-February) and the bacterial community (December-April). Productivity and biomass of bacterial communities are known to depend on eukaryote-derived resources (Williams et al 2013;Buchan et al 2014;Tsuchiya et al 2015;Sugai et al 2016;Luria et al 2017;Tsuchiya et al 2019); therefore, the bacterial commu-nity would also be formed dependent on the eukaryotic community. Significantly different clusters formed during different seasons at 100 m depths (clusters 1, 3 and 4 for eukaryotic community and clusters 1 and 4-3 for bacterial community).…”

Section: Overall Plankton Community and Diversity Dynamicsmentioning

confidence: 99%

“…Previous studies reported temporal/seasonal variation of bacterio-, phyto-and zooplankton in Sagami Bay and their ecology in relation to environmental factors. (Takasuka et al 2003;Ara et al 2006;Miyaguchi et al 2006;Shimode et al 2006;Hashihama et al 2008;Baek et al 2009;Baki et al 2009;Tsuchiya et al 2013Tsuchiya et al , 2016Sugai et al 2016Sugai et al , 2018Sugai et al , 2020. A few studies analysed diversity of plankton using 18S and 16S rRNA gene (Kita-Tsukamoto et al 2006;Kok et al 2012a, b).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan

Sogawa¹,

Tsuchiya²,

Nagai³

et al. 2022

MBMG

Self Cite

View full text Add to dashboard Cite

Sagami Bay, Japan is influenced by both the warm Kuroshio Current and the cold Oyashio Current and rich nutrients are supplied from multiple river sources and the deep-sea, forming a dynamic ecosystem. The aim of the present study was to investigate eukaryotic and bacterial communities in the coastal waters of Sagami Bay, using 16S rRNA and 18S rRNA sequencing and to assess the seasonal and vertical dynamics in relation to physicochemical and biological conditions. Eukaryotic and bacterial communities showed synchronous seasonal and vertical changes along with environmental variability. Diversity of plankton community suspended in the surface was lower than those at the subsurface layers in both the eukaryotes and bacteria communities; however, community diversity showed different characteristics in the subsurface where the eukaryotic community at the deeper layer (100 m) was as low as the surface and highest in intermediate depth layers (10–50 m), while that of bacterial community was highest in the deeper layer (100 m). The annual variability of the coastal microbial communities was driven, not only by the seasonal changes of abiotic and biotic factors and short-term rapid changes by river water inflow and phytoplankton blooms, but also largely influenced by deep-seawater upwellings due to the unique seafloor topography.

show abstract

Response of phytoplankton and enhanced biogeochemical activity to an episodic typhoon event in the coastal waters of Japan

Tsuchiya

Kuwahara

Yoshiki

et al. 2017

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Bacterial growth rate and the relative abundance of bacteria to heterotrophic nanoflagellates in the euphotic and disphotic layers in temperate coastal waters of Sagami Bay, Japan

Cited by 7 publications

References 58 publications

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan

Response of phytoplankton and enhanced biogeochemical activity to an episodic typhoon event in the coastal waters of Japan

Contact Info

Product

Resources

About

Bacterial growth rate and the relative abundance of bacteria to heterotrophic nanoflagellates in the euphotic and disphotic layers in temperate coastal waters of Sagami Bay, Japan

Cited by 7 publications

References 58 publications

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

Photochemical Production and Biological Consumption of CO in the SML of Temperate Coastal Waters and Their Implications for Air‐Sea CO Exchange

﻿Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan

Response of phytoplankton and enhanced biogeochemical activity to an episodic typhoon event in the coastal waters of Japan

Contact Info

Product

Resources

About

Annual dynamics of eukaryotic and bacterial communities revealed by 18S and 16S rRNA metabarcoding in the coastal ecosystem of Sagami Bay, Japan