Journal of Environmental Biology

Seasonal succession and diversity of phytoplankton in

a eutrophic lagoon (Liman lake)

 

Elif Neyran Soylu*¹ and Arif Gonulol²

 

¹Department of Biology, Faculty of Arts and Science, Giresun University, 28100, Giresun, Turkey

 

²Department of Biology, Faculty of Arts and Science, Ondokuz Mayis University, 55139, Kurupelit, Samsun, Turkey

(Received: January 12, 2008; Revised received: January 01, 2009; Accepted: April 18, 2009)

 

Abstract: The seasonal succession, composition and diversity of phytoplankton in a eutrophic lagoon (Liman lake) were studied between January 2002 and November 2003. Samples were collected from surface water and deeper (1m depth) at stations and species diversity (Shannon-Weaver, H) and evenness were calculated. Shannon Diversty was similar at Station 1? and Station 2. Minimum and maximum diversity values (0.101 and 0.765 bits.mm^-3) were recorded in June and July 2003 at Station 2. Cluster analysis and NMDS (Non metric multidimensial scaling) were applied to the phytoplankton community. The lagoon exhibits high conductivity (7211-10757 ?Scm^-1), mean temperature of 17.7^oC, varying concentrations of dissolved oxygen (3.3-8.4 mgl^?l). Light, temperature, rainfall, turbidity and salinity were expected to be the main factors affecting the seasonal succession. The seasonal succession of phytoplankton were similar at surface water and 1m depth. A total of 130 taxa belonging to Bacillariophyta, Chlorophyta, Euglenophyta, Cyanophyta, Dinophyta, Xantophyta, Chrysophyta and Cryptophyta divisions were identified. Pseudanabaena limnetica, Kirchneriella obesa, Kirchneriella lunaris, Ankistrodesmus falcatus and Ankistrodesmus spiralis were highly represented.

Key words: Phytoplankton, Lagoon, Seasonal succession, Liman lake, Kizilirmak Delta, Salinity

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