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Title of Journal: J Oceanogr

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Abbravation: Journal of Oceanography

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Publisher

Springer Netherlands

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DOI

10.1007/bf01966621

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ISSN

1573-868X

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Role of environment and hydrography in determining

Authors: Smita Mitbavkar Toshiro Saino Naho Horimoto Jota Kanda Takashi Ishimaru
Publish Date: 2009/03/07
Volume: 65, Issue: 2, Pages: 195-208
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Abstract

Seasonal variations in the picoplankton community were investigated from June 2002 to March 2004 within the photic zone of Sagami Bay Japan The study area was mostly dominated by coastal waters during the warm period mixed layer water temperature ≥ 18°C During the cold period mixed layer water temperature ≤ 18°C the water mass was characterized by low temperature and high saline waters indicative of the North Pacific Subtropical Mode Water NPSTMW Occasionally a third type of water mass characterized by high temperature and low saline properties was observed which could be evidence of the intrusion of warm Kuroshio waters Synechococcus was the dominant picophytoplankton 5−28 × 1011 cells m−2 followed by Prochlorococcus 1−5 × 1011 cells m−2 and picoeukaryotes during the warm period Heterotrophic bacteria dominated the picoplankton community throughout the year especially in the warm period During the Kuroshio Current advection cyanobacterial abundance was high whereas that of picoeukaryotes and heterotrophic bacteria was low During the cold period homogeneously distributed lower picophytoplankton cell densities were observed The dominance of Synechococcus in the warm period reflects the importance of high temperature low salinity and high Photosynthetically Active Radiation PAR on its distribution Cyanobacterial and heterotrophic bacterial abundance showed a positive correlation with temperature Prochlorococcus and picoeukaryotes showed a positive correlation with nutrients Picoeukaryotes were the major contributors to the picophytoplankton carbon biomass The annual picophytoplankton contribution to the photosynthetic biomass was 32 ± 4 These observations suggest that the environmental conditions combined with the seasonal variability in the source of the water mass determines the community structure of picoplankton which contributes substantially to the phytoplankton biomass and can play a very important role in the food web dynamics of Sagami Bay


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Other Papers In This Journal:

  1. Stoichiometry among bioactive trace metals in seawater on the Bering Sea shelf
  2. Deep-sea meiofauna off the Pacific coast of Tohoku and other trench slopes around Japan: a comparative study before and after the 2011 off the Pacific coast of Tohoku Earthquake
  3. Estimates of non-tidal exchange transport between the Sea of Okhotsk and the North Pacific
  4. Ecological characteristics of Walleye pollock eggs and larvae in the southeastern Bering Sea during the late 1970s
  5. Seasonal variability of phytoplankton community structure in the subtropical western North Pacific
  6. A piecewise curve-fitting technique for vertical oceanographic profiles and its application to density distribution
  7. Further evidence for non-reemergence of winter SST anomalies in the North Pacific eastern subtropical mode water area
  8. A Zonal Pathway for NADW in the South Atlantic
  9. Has the upper portion of the Japan Sea Proper Water formation really been enhancing?
  10. Structure and Transport of the Agulhas Current and Its Temporal Variability
  11. Marine artificial structures as amplifiers of Aurelia aurita s.l. blooms: a case study of a newly installed floating pier
  12. Assessment of turbulence closure models for resonant inertial response in the oceanic mixed layer using a large eddy simulation model
  13. Effect of the along-strait wind on the volume transport through the Tsushima/Korea Strait in September
  14. Interannual variability of Pacific Winter Water inflow through Barrow Canyon from 2000 to 2006
  15. Effects of seawater acidification on hydrolytic enzyme activities
  16. Significant contribution of lytic mortality to bacterial production and DOC cycles in Funka Bay, Japan
  17. Measurement of Noble Gas Solubility in Seawater Using a Quadrupole Mass Spectrometer
  18. Microbial biomass in the Eutrophic Bay of Shimoda as compared by estimations of several biomass parameters
  19. Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal
  20. A note on the driving mechanisms of current in the Taiwan Strait
  21. Degradation of lubricating oils by marine bacteria observed by quantitative mass spectrometry
  22. Features of the Comacchio ecosystem transformed during persistent bloom of picocyanobacteria
  23. Interannual variability of the North Pacific Subtropical Countercurrent: role of local ocean–atmosphere interaction
  24. Seasonal dynamics of the phytoplankton community in Sendai Bay, northern Japan

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