Changes in the abundance and composition of picophytoplankton in relation to the occurrence of a Kyucho and a bottom intrusion in the Bungo Channel, Japan

Hirose, Miho; Katano, Toshiya; Hayami, Yuichi; Kaneda, Atsushi; Kohama, Takeshi; Takeoka, Hidetaka; Nakano, Susumu

doi:10.1016/j.ecss.2007.07.030

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…Since the temperature of the river water was higher than that of the lake water, these cells would be advected by the river inflow. The effect of the physical process on the composition of the picocyanobacterial community is well known for marine environments (Wood et al 1998;Liu et al 2004;Katano et al 2005aKatano et al , 2007Hirose et al 2008). Therefore, the physical process is also important when determining the distribution of PC-or PE-rich cells in Lake Baikal.…”

Section: Discussionmentioning

confidence: 98%

Abundance and pigment type composition of picocyanobacteria in Barguzin Bay, Lake Baikal

et al. 2008

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In Lake Baikal, picocyanobacteria are the most important primary producers during the summer. Freshwater picocyanobacteria are discriminated into either the phycoerythrin (PE)-rich or the phycocyanin (PC)-rich types according to their pigment composition. The distributions of these two types of picocyanobacteria were investigated in Barguzin Bay. The PC-rich type accounted for [98% of the total picocyanobacteria at the station near the shore of the bay where river water flows directly in. In the offshore area of the lake, all of the picocyanobacteria cells were of the PE-rich type. In addition, the occurrence of the PC-rich type was restricted to the station, where the attenuation coefficient exceeded 0.25 m -1 . Near the shore, where the turbidity was high ([1 NTU), the cell densities of both the PE-and PC-rich types increased away from the river mouth. This indicates that the PC-rich type cells grow near the shore of the bay where turbidity is high. Since the PCrich type could not grow well when cells were incubated in offshore lake water, restricted distribution of the PC-rich type could also be explained by their growth capability. The present study clearly demonstrated the shift in the pigment type composition of picocyanobacteria from the coastal to the pelagic zone of Lake Baikal. The co-existence of the two pigment types probably enables the abundance of the picocyanobacterial community to be stable over a broader range of environmental conditions than would be possible for a single pigment type.

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Section: Discussionmentioning

confidence: 98%

Abundance and pigment type composition of picocyanobacteria in Barguzin Bay, Lake Baikal

et al. 2008

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“…Jiao and Yanhui (2002) determined that Prochlorococcus in the high latitude China sea was distributed along the Kuroshio Current, which is the second largest warm‐water current in the world. Hirose and colleagues (2008) reported that the exogenous Prochlorococcus brought by warm currents could grow in the Bungo Channel. The results presented in that paper suggested that those Prochlorococcus that appear in temperate seas may be brought from oligotrophic tropical oceans by warm currents; however, our study area is located some distance away from the Kuroshio Current.…”

Section: Discussionmentioning

confidence: 99%

Distribution of microbial populations and their relationship with environmental parameters in the coastal waters of Qingdao, China

Wang¹,

Liang

Bai

et al. 2010

Environmental Microbiology

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In order to understand the large-scale distribution of microbial populations simultaneously and their relationship with environmental parameters, flow cytometry was used to analyse samples collected from 46 stations in the coastal waters of Qingdao in spring, 2007. The distribution of virus was significantly and positively correlated with heterotrophic bacteria. Two groups of picophytoplankton (Synechococcus and picoeukaryotes) were detected; however, Prochlorococcus was not found. Picoeukaryotes and nanophytoplankton were abundant in the near-shore waters, whereas Synechococcus was abundant in the off-shore areas. No variation was found in vertical distribution of virus, heterotrophic bacteria, Synechococcus and nanophytoplankton abundances, except picoeukaryotes abundance in the bottom layer was dramatically lower than that in the upper layers. Correlation analyses indicated that the relationship between abiotic variables and heterotrophic bacteria, pico- and nanophytoplankton was closer than that between abiotic variables and virioplankton. Temperature and nutrients were the synchronous factors controlling the growth of heterotrophic bacteria, pico- and nanophytoplankton in the coastal waters of Qingdao in spring. The results suggested that synergistic and antagonistic effects existed among microbial groups.

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“…However, it also provides us with an opportunity to monitor the nutrient and biological transitions induced by growing Kuroshio frontal waves because field measurements can be limited in space to within the narrow Bungo Channel of width about 50 km. In fact, kyucho induced transitions of phytoplankton biomass and/or species have been pointed out in Bungo Channel research [ Koizumi and Kohno , 1994; Katano et al , 2007; Hirose et al , 2008]. Hence, we are able to predetermine the location where nutrient and biological transitions may occur after the passage of growing frontal waves (i.e., kyucho).…”

Section: Introductionmentioning

confidence: 76%

Hindcast and predictability of sporadic Kuroshio‐water intrusion (kyucho in the Bungo Channel) into the shelf and coastal waters

Isobe¹,

Guo²,

Takeoka³

2010

J. Geophys. Res.

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[1] Prerequisite(s) for ocean circulation models capable of hindcasting "kyucho" occurrence (a sudden coastal temperature rise induced by Kuroshio frontal waves) in the Bungo Channel, Japan, is investigated using long-term observed temperature and sea level time series, archived hydrographic data, and reanalysis data provided by the Japanese Coastal Ocean Predictability Experiment (JCOPE) group. Anticyclonic mesoscale eddies impinging on the Kuroshio front south of the Bungo Channel enhance the frontal sharpness, frontal wave growth, and activity of kyucho phenomena. A kyucho hindcast is carried out to examine the reliability of a numerical model including realistic anticyclonic eddies propagating south of Japan. The Finite Volume Coastal Ocean Model (FVCOM) for which boundary conditions are given by daily JCOPE2 reanalysis data is adopted in the present study. This numerical model does a reasonable job of hindcasting kyucho occurrence in 2003. It is therefore considered that forecasts of kyucho occurrence up to 2 or 3 months ahead are possible by using the FVCOM in conjunction with JCOPE2 forecast data.Citation: Isobe, A., X. Guo, and H. Takeoka (2010), Hindcast and predictability of sporadic Kuroshio-water intrusion (kyucho in the Bungo Channel) into the shelf and coastal waters,

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Changes in the abundance and composition of picophytoplankton in relation to the occurrence of a Kyucho and a bottom intrusion in the Bungo Channel, Japan

Cited by 10 publications

References 34 publications

Abundance and pigment type composition of picocyanobacteria in Barguzin Bay, Lake Baikal

Abundance and pigment type composition of picocyanobacteria in Barguzin Bay, Lake Baikal

Distribution of microbial populations and their relationship with environmental parameters in the coastal waters of Qingdao, China

Hindcast and predictability of sporadic Kuroshio‐water intrusion (kyucho in the Bungo Channel) into the shelf and coastal waters

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