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Journal of Oceanography

, Volume 73, Issue 3, pp 345–364 | Cite as

Seasonal dynamics influencing coastal primary production and phytoplankton communities along the southern Myanmar coast

  • Maung-Saw-Htoo-Thaw
  • Shizuka Ohara
  • Kazumi Matsuoka
  • Tatsuya Yurimoto
  • Shota Higo
  • Khin-Ko-Lay
  • Win-Kyaing
  • Myint-Shwe
  • Sein-Thaung
  • Yin-Yin-Htay
  • Nang-Mya-Han
  • Khin-Maung-Cho
  • Si–Si-Hla-Bu
  • Swe-Thwin
  • Kazuhiko KoikeEmail author
Original Article

Abstract

Myanmar is tenth among the world’s fish-producing countries and third in ASEAN (Association of Southeast Asian Nations). To understand the mechanisms underlying the high production, oceanographic and phytoplankton surveys, including primary productivity measurements based on pulse amplitude modulation fluorometry, were conducted near an active fishing ground near Myeik City. Three surveys, one in each of the representative seasons and covering the characteristic coastal environments, showed well-defined seasonality in primary production and phytoplankton occurrence. End of the dry season was the most productive, with productivity of 2.59 ± 1.56 g C m−2 day−1 and high concentration of chlorophyll a (3.14 ± 2.64 µg L−1). In this season, the phytoplankton population was dominated by high densities of the diatoms Bellerochea horologicalis and Chaetoceros curvisetus, whereas primary productivity was low at the onset of the dry season, 1.36 ± 0.77 g C m−2 day−1. However, this low primary production might be compensated by activation of microbial food chains originating from high dissolved organic carbon. The rainy season exhibited the lowest production, 6.6% of the end of the dry season, due to the extensive discharge of turbid water from the rivers which lowered euphotic layer depth and resulted in an unusually high diffuse attenuation coefficient of 2.30 ± 1.03 m−1. This incident of turbid water may be related to soil erosion from deforestation and mangrove deterioration. This research reveals the seasonal trend in Myanmar’s coastal productivity and its relationship to the tropical monsoon climate as well as emphasizing the importance of tropical coastal environments to the sustainability of the fisheries.

Keywords

Myanmar Southeast Asia Primary production Phytoplankton Diatom Dinoflagellate Monsoon Mangrove Coastal environment Andaman Sea Pulse amplitude modulation fluorometry 

Notes

Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP 26304031 to KK as well as a Grant-in-Aid for Project Research (2011) from the Graduate School of Biosphere Science, Hiroshima University. We would like to thank the officers from the Department of Fisheries (Myeik) and staffs from Myeik University, Myanmar, for their collaboration and assistance with our field sampling surveys. We also give grateful to the Myanmar Fisheries Federation (MFF) for the kindly support during our visit to Myanmar.

Supplementary material

10872_2016_408_MOESM1_ESM.pdf (161 kb)
Supplementary material 1 (PDF 161 kb)
10872_2016_408_MOESM2_ESM.pdf (162 kb)
Supplementary material 2 (PDF 161 kb)
10872_2016_408_MOESM3_ESM.pdf (64 kb)
Supplementary material 3 (PDF 63 kb)

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Copyright information

© The Oceanographic Society of Japan and Springer Japan 2017

Authors and Affiliations

  • Maung-Saw-Htoo-Thaw
    • 1
  • Shizuka Ohara
    • 1
  • Kazumi Matsuoka
    • 2
  • Tatsuya Yurimoto
    • 3
  • Shota Higo
    • 1
  • Khin-Ko-Lay
    • 4
  • Win-Kyaing
    • 5
  • Myint-Shwe
    • 4
  • Sein-Thaung
    • 4
  • Yin-Yin-Htay
    • 6
  • Nang-Mya-Han
    • 6
  • Khin-Maung-Cho
    • 6
  • Si–Si-Hla-Bu
    • 6
  • Swe-Thwin
    • 5
  • Kazuhiko Koike
    • 1
    Email author
  1. 1.Graduate School of Biosphere ScienceHiroshima UniversityHigashi-HiroshimaJapan
  2. 2.Institute of East China Sea Research, Graduate School of Fisheries Science and Environmental StudiesNagasaki UniversityNagasakiJapan
  3. 3.Japan International Research Center for Agricultural ScienceTsukubaJapan
  4. 4.Department of FisheriesMinistry of Livestock, Fisheries and Rural DevelopmentNaypyitawMyanmar
  5. 5.Myanmar Fishery FederationYangonMyanmar
  6. 6.Myeik UniversityMyeikMyanmar

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