Temporal fluctuations of the phytoplankton community in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River (Northern Turkey)

Abstract

The aim of this study was to determine the spatial and temporal variation of phytoplankton and water quality in response to the hydrological regime in an isolated floodplain lake (North Mollaköy Lake) of the Sakarya River. Variations in the composition, biomass and functional groups of phytoplankton and environmental parameters were monthly analyzed in subsurface samples collected from the pelagic zone at four stations from July 2012 to June 2013. A total of 109 taxa were identified, and the species which contributed the most to the phytoplankton biomass were grouped into 14 functional groups (FGs). The distribution of FGs was linked to the transition (T1 and T2), high (HW) and low (LW) water periods in North Mollaköy Lake. FGs J, MP, N, G, X1, X2, Y, W1, W2, S1, H1, B and C were the contributors to the phytoplankton biomass during the low-water period (LW) and the transition periods (T1 and T2), while Lo contributed the most during the high-water period (HW). RDA revealed that the most important factor affecting the temporal distribution of FGs was the water discharge and that there are

Environmental heterogeneity affecting spatial distribution of phytoplankton community structure and functional groups in a large eutrophic lake, Lake Chaohu, China

“…When Y ≧ 0.02, phytoplankton was regarded as dominant species (Jiang et al, 2014). The phytoplankton functional groups were classi ed according to the methods of Reynolds et al, (2002) and Padisák et al, (2009), and those with a relative biomass above 5% were de ned as dominant functional groups (Sevindik et al, 2014).…”

Environmental heterogeneity affecting spatial distribution of phytoplankton community structure and functional groups in a large eutrophic lake, Lake Chaohu, China

“…The biomass of phytoplankton functional groups can explain the dynamics of phytoplankton community structure and response to environmental characteristics (Hu et al 2015 ). The phytoplankton functional groups are classified according to the methods of Reynolds et al ( 2002 ) and Padisák et al ( 2009 ), and those with a relative biomass above 5% are defined as dominant functional groups (Sevindik et al 2014 ). The formula is P i = n i / N , in which n i is the biomass of the i th functional group, and N is total biomass of phytoplankton.…”

Temporal monitoring of vast sand mining in NW Turkey: Implications on environmental/social impacts

“…These artificial lakes are formed of excavating 326 hectares of the floodplain. These lakes are now part of the landscape with having its own habitat (Ongun-Sevindik, et. al., 2014).…”