Tran Thi Le Van, Doan Nhu Hai, Phan Tan Luom, Nguyen Thi Mai Anh, Tran Thi Minh Hue, Huynh Thi Ngoc Duyen


Phytoplankton, especially community characteristics, in coastal waters of Da Nang have not been well studied. This present study analyzed data of phytoplankton for diversity and abundance from surveys from 2002 to 2016 at 44 stations in the coastal Da Nang waters. A total of 316 taxa from 9 classes were identified: Dinophyceae (134 taxa), Mediophyceae (77 taxa), Coscinodiscophyceae (44 taxa), Bacillariophyceae (36 taxa), Cyanophyceae (3 taxa), Dictyochophyceae (2 taxa), Bacillariophyta classis incertae sedis (1 taxon), Conjugatophyceae (1 taxon) and Thecofilosea (1 taxon). A list of 36 species of potentially harmful microalgae was recorded in coastal waters of Da Nang. In which, Pseudo-nitzschia spp. often had higher cell densities in some locations during the northeast monsoon. Analyzing diversity indices in different locations showed that there were significance differences of Margalef and Shannon indices, low in estuarine area (CS) and higher in the south of Son Tra peninsula (NST). Meanwhile no strong differences of Pielou and Simpson indices were found among the locations. However, there were strong differences of Margalef, Simpson and Pielou indices, which were found over the three studied years (2004, 2005, and 2006), mainly in NST, the northeast of Son Tra peninsula (DBST) and Da Nang bay (VDN). Analysis of species accumulation curves indicated that only 56–95% of species  was found compared to maximal expected species richness in all studied locations. DMS analysis showed that there was year-based similarity among the years (ca. 50% of similarity) of phytoplankton communities. Among the studied years, average phytoplankton cell densities in Da Nang bay and the northeast of Son Tra were higher than those in other years and locations. This present study on species richness, expected species richness and variation in phytoplankton abundance suggested that there is a need of increasing sampling efforts, especially in riverine area and DBST for better understanding of characteristics of phytoplankton communities in coastal Da Nang waters.


Diversity index, phytoplankton, Son Tra peninsula, Da Nang bay.

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William, K. T., and Munger, S. P., 2009. Marine Phytoplankton. New York: Nova Science Publishers, 382 p.

Bužančić, M., Gladan, Ž. N., Marasović, I., Kušpilić, G., and Grbec, B., 2016. Eutrophication influence on phytoplankton community composition in three bays on the eastern Adriatic coast. Oceanologia, 58(4), 302–316.

Nguyễn Văn Khôi, Nguyễn Cho và Nguyễn Ngọc Lâm, 1995. Tổng quan tình hình nghiên cứu sinh vật phù du vùng biển Việt Nam trong 70 năm (1924–1994). Tuyển tập Nghiên cứu biển, 6, 81–90.

Shirota, A., 1966. The plankton of South Vietnam: Fresh water and marine plankton. Overseas Technical Cooperation Agency. 462 p.

Graham, H. W., and Bronikovsky, N., 1944. The Genus Ceratium in the Pacific and North Atlantic Oceans (Vol. 565). (Scientific Results of Cruise VII of the Carnegie, During 1928-1929 Under Command of Captain JP Ault. Biology-v.). Carnegie Institution of Washington. 209 p.

Hoàng Quốc Trương, 1962. Phiêu sinh vật vịnh Nha Trang: 1. Khuê tảo: Bacillariale. Universite de Sai Gon - Ann. de la Faculté des Saigon. Contribution No. 59, 121–214.

Hoàng Quốc Trương, 1963. Phiêu sinh vật vịnh Nha Trang. 2. Tảo giáp. Institut Océanographique de Nha Trang - Ann. de la Faculté des Saigon 2, 129–176.

Taylor, F. J. R., 1976. Dinoflagellates from the International Indian Ocean Expedition. A report on material collected by the R. V. “Anton Bruun” 1963–1964.

Trương Ngọc An, 1993. Tảo silic phù du biển Việt Nam. Nxb. Khoa học và Kỹ thuật, 315 tr.

Tomas, C. R. (Ed.), 1997. Identifying marine phytoplankton. Elsevier.

Larsen, J., and Nguyen, N. L., 2004. Potentially toxic microalgae of Vietnamese waters. Opera Botanica, 140, 5–216.

Nguyen-Ngoc, L., Ho-Van, T., and Larsen J., 2012. A taxonomic Account of Ceratium (Dinoflagellates) in Vietnamese Waters. The Thailand Natural History Museum Journal, 6(1), 25–59.

Doan-Nhu, H., Nguyen-Ngoc, L., Anh, N. T. M., Larsen, J., and Thoi, N. C., 2014. Diatom genus Chaetoceros Ehrenberg 1844 in Vietnamese waters. Nova Hedwigia, (143), 159–222.

Phan Tấn Lượm, Nguyễn Ngọc Lâm, Đoàn Như Hải, 2016. Phân loại học Phân chi Archaeperidinium thuộc chi Protoperidinium (Dinophyceae) ở vùng biển Việt Nam. Tạp chí Sinh học, 38(1), 39–52.

Phan‐Tan, L., Nguyen‐Ngoc, L., Doan‐Nhu, H., Raine, R., and Larsen, J., 2017. Species diversity of Protoperidinium sect. Oceanica (Dinophyceae, Peridiniales) in Vietnamese waters, with description of the new species P. larsenii sp. nov. Nordic Journal of Botany, 35(2), 129–146.

Guiry, M. D., and Guiry, G. M., 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 07 May 2018.

Sournia, A., 1978. Phytoplankton manual. UNESCO, Printed in France.

Andersen, P., and Kristensen, H. S., 1995. Rapid and precise identification and counting of thecate dinoflagellates using epifluorescence microscopy. Harmful Marine Algal Blooms. Lavoisier Publishing, Paris, 713–718.

Wickham, H., 2009. ggplot2: Elegant Graphics for Data Analysis. Springer Science & Business Media.

Giraudoux, P., 2017. Data Analysis in Ecology, Package ‘pgirmess’. Version 1.6.7.

Wickham, H., Francois, R., Henry, L., and Müller, K., 2018. A Grammar of Data Manipulation. Package “dplyr”, Version 0.7.6.

Margalef, D. R., 1958. Information theory in ecology, General systems. Transl, from Mem. Real Acad. Cienc. Arts. Barcelona, 32, 373–449.

Pielou, E. C., 1966. The measurement of diversity in different types of biological collections. Journal of theoretical biology, 13, 131–144.

Shannon, C. E., 1948. A mathematical theory of communication. Bell system technical journal, 27(3), 379–423.

Simpson, E. H., 1949. Measurement of diversity. Nature, 163(4148), 688.

Colwell, R. K., Mao, C. X., and Chang, J., 2004. Interpolating, extrapolating, and comparing incidence‐based species accumulation curves. Ecology, 85(10), 2717–2727.

Ilyash, L. V., and Matorin, D. N., 2007. Features of the spatial distribution of phytoplankton in Nhatrang Bay of the South China Sea during the rainy season. Oceanology, 47(6), 788–796.

H. Doan-Nhu, L. Nguyen-Ngoc, Nguyen C.T., 2016. ENSO and anthropogenic impacts on phytoplankton diversity in tropical coastal waters. Journal Progress in Oceanography, 140: 1-13. Publisher ScienceDirect.

Williams, V. L., Witkowski, E. T., and Balkwill, K., 2007. The use of incidence-based species richness estimators, species accumulation curves and similarity measures to appraise ethnobotanical inventories from South Africa. Biodiversity and Conservation, 16(9), 2495–2513.

Canning‐Clode, J., Valdivia, N., Molis, M., Thomason, J. C., and Wahl, M., 2008. Estimation of regional richness in marine benthic communities: quantifying the error. Limnology and Oceanography: Methods, 6(11), 580–590.


Journal of Marine Science and Technology ISSN: 1859 3097

Published by Vietnam Academy of Science and Technology