Assessment on trophic status of Nha Trang bay using environmental and phytoplankton based indices

Authors

  • Huynh Thi Ngoc Duyen University of Natural Sciences, National University of HCMC
  • Nguyen Thi Mai Anh Institute of Oceanography, VAST
  • Nguyen Chi Thoi Institute of Oceanography, VAST
  • Tran Thi Le Van Institute of Oceanography, VAST
  • Phan Tan Luom Institute of Oceanography, VAST
  • Nguyen Ngoc Lam Biology, Taxonomy, Dinoflagellates
  • Doan Nhu Hai Institute of Oceanography, VAST

DOI:

https://doi.org/10.15625/0866-7160/v37n4.7423

Keywords:

Environment indicator, phytoplankton, trophic status, Nha Trang bay

Abstract

Ten year data of environment and phytoplankton community structure were used to calculate trophic status indices of Nha Trang Bay. The two indicating groups, environmental and phytoplankton based indices, were different and varied in time. Both TRIX (4.3-5.9) and TSI (28.5-53.1) indices indicated Nha Trang Bay was in oligotrophic to mesotrophic status. However, trophic diatoms index, TDI (1.4-5.0) indicated high frequency of mesotrophic and eutrophic status of the waters. Ratios of centric to pennate diatoms (C/P, both in species number and in abundance) frequently indicated eutrophic status (>2.0) of the waters. Correlation matrix showed possitive relationships amongst environmental and phytoplankton based indices. The present study suggested that phytoplankton ratios, Dia/Dino-N and C/P-N indices, are applicable in assessing trophic status of coastal waters. The TDI index, however, is needed for further studies to be applicable for coastal waters.

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Author Biographies

Huynh Thi Ngoc Duyen, University of Natural Sciences, National University of HCMC

Environtmental Sciences

 

Nguyen Thi Mai Anh, Institute of Oceanography, VAST

Taxonomy, Diatoms

Nguyen Chi Thoi, Institute of Oceanography, VAST

Bio-statistic & phytoplankton ecology

Tran Thi Le Van, Institute of Oceanography, VAST

Database of phytoplankton, PlanktonSys Soft.

Phan Tan Luom, Institute of Oceanography, VAST

Taxonomy, Dinoflagellates

Doan Nhu Hai, Institute of Oceanography, VAST

Hydrobiology, Marine Biology & Ecology, Bio-statistic

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Published

26-11-2015

How to Cite

Ngoc Duyen, H. T., Mai Anh, N. T., Thoi, N. C., Le Van, T. T., Luom, P. T., Lam, N. N., & Hai, D. N. (2015). Assessment on trophic status of Nha Trang bay using environmental and phytoplankton based indices. Academia Journal of Biology, 37(4), 446–457. https://doi.org/10.15625/0866-7160/v37n4.7423

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