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Temporal changes of phytoplankton community at different depths of a shallow hypertrophic reservoir in relation to environmental variables

Published online by Cambridge University Press:  20 June 2009

YongSu Kwon ,
SoonJin Hwang ,
KuSung Park ,
HoSeob Kim ,
BaikHo Kim ,
KyungHoon Shin ,
KwangGuk An ,
YoungHee Song  and
YoungSeuk Park
YongSu Kwon
Affiliation:
Department of Biology and The Korea Institute of Ornithology, Kyung Hee University, Seoul 130701, Korea
SoonJin Hwang*
Affiliation:
Department of Environmental Science, Konkuk University, Seoul 143701, Korea
KuSung Park
Affiliation:
Department of Environmental Science, Konkuk University, Seoul 143701, Korea
HoSeob Kim
Affiliation:
Watershed Management Research Divisions, National Institute of Environmental Research, Incheon 404170, Korea
BaikHo Kim
Affiliation:
Department of Environmental Science, Konkuk University, Seoul 143701, Korea
KyungHoon Shin
Affiliation:
Department of Environmental Marine Science, Hanyang University, Ansan 425791, South Korea
KwangGuk An
Affiliation:
School of Bioscience and Biotechnology, Chungnam National University, Daejeon 305764, South Korea
YoungHee Song
Affiliation:
Rural Research Institute, Ansan 426908, South Korea
YoungSeuk Park
Affiliation:
Department of Biology and The Korea Institute of Ornithology, Kyung Hee University, Seoul 130701, Korea
*
sjhwang@konkuk.ac.kr parkys@khu.ac.kr
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Abstract

We characterized phytoplankton community succession at different depths of a shallow hypertrophic reservoir in relation to physical and chemical environmental variables. The phytoplankton community was sampled biweekly at three different water depths (surface, middle and bottom) in the reservoir from November 2002 to February 2004. A range of 18 environmental variables including temperature, electrical conductivity (EC), total phosphorus (TP) and total nitrogen (TN) were measured to assess their influence on phytoplankton community succession. As well, combined multivariate analyses with a cluster analysis and a nonmetric multidimensional scale (NMDS) were conducted. Microcystis aeruginosa was the dominant species in all seasons except spring. Thus, Cyanophyceae was a dominant taxonomic group. In spring, Bacillariophyceae dominated, followed by Cryptophyceae and Chlorophyceae. The succession was relatively delayed at the middle and bottom layers compared with at the surface layer. Abundance and species richness of phytoplankton were also higher in the surface layer than in the bottom layer. Cluster analysis classified the phytoplankton community into four clusters at each depth, and the changes were also well reflected in the NMDS ordination. Each cluster showed seasonal patterns characterized by indicator species, as well as environmental variables such as temperature, conductivity, and nutrients including N and P. Seasonal dynamics of the phytoplankton community was the strongest at the surface layer and weakest at the bottom layer. These depth-variable environmental variables are likely to be the key factors driving changes in the phytoplankton community composition.

Keywords

Algaeclassificationlakessuccessionvertical differences
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 45 , Issue 2 , 2009 , pp. 93 - 105
Copyright
© EDP Sciences, 2009

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