Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Distribution of Phytoplankton and Bacteria in the Environmental Transitional Zone of Tropical Mangrove Area

열대 홍수림 주변 해역 환경 전이대의 식물플랑크톤 및 박테리아의 분포

  • 최동한 (한국해양과학기술원 해양바이오연구부) ;
  • 노재훈 (한국해양과학기술원 해양생태계연구부) ;
  • 안성민 (한국해양과학기술원 해양생태계연구부) ;
  • 이미진 (한국해양과학기술원 해양정책연구소) ;
  • 김동선 (한국해양과학기술원 해양순환.기후연구부) ;
  • 김경태 (한국해양과학기술원 해양환경.보전연구부) ;
  • 권문상 (한국해양과학기술원 해양정책연구소) ;
  • 박흥식 (한국해양과학기술원 태평양해양연구센터)
  • Received : 2013.09.26
  • Accepted : 2013.11.22
  • Published : 2013.12.30
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Abstract

In order to understand phytoplankton and bacterial distribution in tropical coral reef ecosystems in relation to the mangrove community, their biomass and activities were measured in the sea waters of the Chuuk and the Kosrae lagoons located in Micronesia. Chlorophyll a and bacterial abundance showed maximal values in the seawater near the mangrove forests, and then steeply decreased as the distance increased from the mangrove forests, indicating that environmental conditions for these microorganisms changed greatly in lagoon waters. Together with chlorophyll a, abundance of Synechococcus and phototrophic picoeukaryotes and a variety of indicator pigments for dinoflagellates, diatoms, green algae and cryptophytes also showed similar spatial distribution patterns, suggesting that phytoplankton assemblages respond to the environmental gradient by changing community compositions. In addition, primary production and bacterial production were also highest in the bay surrounded by mangrove forest and lowest outside of the lagoon. These results suggest that mangrove waters play an important role in energy production and nutrient cycling in tropical coasts, undoubtedly receiving large inputs of organic matter from shore vegetation such as mangroves. However, the steep decrease of biomass and production of phytoplankton and heterotrophic bacteria within a short distance from the bay to the level of oligotrophic waters indicates that the effect of mangrove waters does not extend far away.

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References

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