Diel Changes in Phytoplankton Composition and Abundance in the Surface and Sub‐Surface Strata from a Shallow Eutrophic Pond

Abstract

Representative phytoplankton assemblages were identified in a eutrophic pond over a 24 hour period. One assemblage characterized species in the surface (neuston) layer and another consisted of algae from 2, 5, and 20 cm sub-surface depths. The surface layer (0 cm) included a similar, but less diverse assemblage of species, and a lower abundance of cells per unit volume, than those at the lower depths. At each of the sub-surface depths (2-20 cm), the major phytoplankton components initially followed similar patterns of abundance in reference to the time and depth of sample collections then later differed in their abundance levels. The dominant algae were chlorophytes, cryptophytes, diatoms, and cyanobacteria. Mean concentrations of total phytoplankton, over the 24 hours for the surface, were 3.3 × 10 3 cells ml -1 , compared to 36.9 × 10 3 cells ml -1 for depths 2-20 cm. The autotrophic picoplankton abundance was recorded separately from the phytoplankton with mean concentrations of 472.9 × 10 3 cells ml -1 in the surface layer and 623.0 × 10 3 cells ml -1 for the three sub-surface depths. Photos of representative species from these surface layers are presented.

Phyto- and zooplankton in fishponds contaminated with heavy metal runoff from a lead-zinc mine

“…Although Xanthophyceae taxa are very often found in shallow and small ponds, our knowledge about their ecology is very limited. Moreover, some of species are mixed up with green algae (Wilk-Woźniak and Marshall 2009). Together with a decrease in diatoms, the contribution of green algae increased, especially Desmodesmus species, which are tolerant to many types of contamination (Vymazal 1995).…”

Changes in Water Quality for Sprinkler Irrigation in Selected Lakes of the Poznan Lake District

“…An important factor modifying the physico-chemical parameters of water, having an indirect effect on phytoplankton, is the environment of a given reservoir and the way it is managed (Wilk-Woźniak et al, 2016). Any changes in environmental factors are reflected in the dynamics, density, biomass and groups of dominant phytoplankton communities of a water body (Godlewska et al, 2003;Strzesak, 2014;Wilk-Woźniak, 1996, 2000Wilk-Woźniak and Marshall, 2009).…”