Phytoplankton in an ecological status assessment of the vendace-type Lake Dejguny (northeastern Poland)

Abstract

The aim of the study was to perform an ecological status assessment based on the phytoplankton in the vendace-type Lake Dejguny in accordance with the requirements of the Water Framework Directive. The phytoplankton analyses were conducted during three growth seasons in 2006, 2007, and 2008. The phytoplankton multimetric Phytoplankton Metric for Polish Lakes (PMPL) was used to assess the lake’s ecological status. The average total biomass of phytoplankton ranged from 1.6 to 3.9 mg dm-3, while the average biomass of Cyanoprokaryota ranged from 0.4 to 1.4 mg dm-3, with the minimum noted in 2008. The phytoplankton assemblages were dominated mainly by filamentous Cyanoprokaryota and pennate Bacillariophyceae in 2006 and 2008, or exclusively by pennate Bacillariophyceae in 2007. The relatively low total biomass and Cyanoprokaryota biomass, as well as seasonal phytoplankton dynamics with the dominant taxa of Tabellaria flocculosa, Dinobryon sociale, and D. divergens confirmed the lake’s mesotrophic state and some of the features of reference conditions in this lake, whereas the predominance of filamentous species Planktothrix agardhii and Planktolyngbya limnetica was characteristic of eutrophic conditions. However, a clear tendency towards progressive eutrophication stemming from the significant domination of filamentous Cyanoprokaryota was observed, and according to the PMPL the assessment indicated that Lake Dejguny had a good ecological status in 2006 and 2007 and even a high one in 2008.

Assessing water quality and classifying trophic status for scientifically based managing the water resources of the Lake Timsah, the lake with salinity stratification along the Suez Canal

“…The phytoplankton community of the Lake Timsah was characterized by higher population density with maximum values (20,986 cell l −1 ) during summer and lower density (11,115 cell l −1 ) during winter, and the dominancy of the diatom group. Phytoplankton structure and abundance are result of spatial and temporal changes in physical, chemical and biological variables (Roy and Chattopadhyay, 2007, Pacheco et al, 2010, Zhang et al, 2011, Demir et al, 2014, Napiórkowska-Krzebietke and Hutorowicz, 2014). Among the algal communities, diatom taxa are considered as a group sensitive to water chemistry and specific ecological conditions, and thus are used as an indicator for water-quality in many aquatic systems (Stevenson and Smol, 2003, Zhang et al, 2011).…”

Aquatic ecosystem health and trophic status classification of the Bitter Lakes along the main connecting link between the Red Sea and the Mediterranean

“…In the areas with lower concentration of phosphorus (TP: 0.76–2.3 µg l −1 ), diatom species such as Amphiprora alata , A. paludosa , Chaetoceros anastomosans , C. curvisetus , C. decipiens , C. tortissimus , Coscinodiscus granii , Hemiaulus heibergii , N. Kützingiana , N. longissima , Nitzschia sigma , N. pungens , Rhizosolenia alata , Skeletonema costatum were dominant diatom species. These dominant diatom species can be suggested as indicators to oligotrophic status of the Bitter Lakes ecosystem, a phenomenon used as potent indicator of trophic status in the water of many lakes (Phillips et al, 2013, Napiórkowska-Krzebietke and Hutorowicz, 2014). On the other hand, Euglenophyceae, represented only by two species and constituting 2% of the total algal community, are rightly represented in this manner owing to the absence of organic matters in the Bitter Lakes water.…”

“…Monitoring and assessing the aquatic environment for eutrophication is essential to mitigate or prevent adverse environmental and economic impacts (Devlin et al, 2011, Napiórkowska-Krzebietke and Hutorowicz, 2014). To ensure the environmental health of aquatic ecosystem including lakes, different regulatory instruments are in place across the regions and the world.…”

Phytoplankton population as alarming warning bioindicator of water pollution in El-Temsah Lake, Egypt

“…This nding is slightly lower than that reported in the recent survey in Temsah lake of Gaballa (2014), who found 116 different genera during 2012. These differences may be associated with spatial and temporal variations in the physiochemical and biological parameters of water bodies (Zhang et al 2011;Demir et al 2014;Napiórkowska-Krzebietke and Hutorowicz 2014;Elshobary et al 2020). The low number of species recorded in the lake can generally be attributed to the persistent discharge of wastewater, leading to increased nutrient supplements hence decreasing predominant species.…”