Effect of physicochemical parameters on zooplankton in the brackish, coastal Vistula Lagoon (original) (raw)
Related papers
The impact of environmental factors on zooplankton communities in the Vistula Lagoon
Oceanological and Hydrobiological Studies, 2011
The Vistula Lagoon, an estuarine system exposed to both continental and marine impacts, is marked by rapid changes in local environmental conditions, including salinity levels, water transparency, temperature, pH, dissolved oxygen concentrations, trophic state and wind speed. Here, the effect of environmental factors on the abundance and horizontal distribution of zooplankton was analysed. A higher number of taxa were noted in the saltwater intrusion section of the Vistula Lagoon (Central Basin) compared to the area of freshwater inflow (Western Basin). The average density of the analysed zooplankton in the western section of the Vistula Lagoon reached 654 indiv. dm -3 , three-fold higher than in the central section (224 indiv. dm -3 ). Differences in zooplankton biomass were even more pronounced (13.43 mg dm -3 vs. 2.33 mg dm -3 ). The Central Basin of the Vistula Lagoon was dominated by Copepoda (approx. 50% total abundance), mostly Calanoida (genus Acartia) typically found in brackish waters. Marine species, including Acartia bifilosa and Acartia tonsa, were also reported. Species of freshwater 1 Corresponding author: epaturej@uwm.edu.pl Cladocera predominated in the Western Basin (over 50% total abundance, mostly the eutrophic species Chydorus sphaericus) where Copepoda were represented by a single cyclopoid species, Cyclops vicinus. The saline and freshwater environments of the Vistula Lagoon differed significantly (p<0.001) with respect to the abundance and biomass of zooplankton. The above differences resulted not only from salinity and temperature conditions, but also from dissolved oxygen concentrations, the trophic state of the investigated water body, and the existing biocenotic relationships.
Oceanologia, 2011
The aim of the study was to determine the trophic state of the Vistula Lagoon in [2007][2008][2009]. The analysis of various trophic state indices, abiotic parameters and different water classifications indicated the eutrophy and even advanced hypereutrophy of the lagoon waters. The composition, abundance and biomass of phytoplankton likewise reflect the eutrophic nature of this water body. For this lagoon, Reynold's functional groups of phytoplankton were used as an indicator of eutrophication for the first time. The dominant phytoplankton organisms in the surface waters belong to 8 functional groups: S1, X1, F, J, K, H1, L O, M. Some key concepts of the EU Water Framework Directive were implemented in this study.
Oceanologia, 2016
The aim of this work was to find out whether the difference between the central Vistula Lagoon (the southern Baltic Sea) and the western lagoon was reflected in the relationships between nutrients and phytoplankton during one-day hot summer conditions when the water temperature exceeded 208C. Significant differences in Soluble Reactive Phosphorus (SRP) and Dissolved Inorganic Nitrogen (DIN) concentrations, and also in the biomass of the dominant phytoplankton assemblage of Cyanoprokaryota, were noted in the studied parts of the lagoon. No such differences were found for the nitrogen to phosphorus ratio (N:P) or for the biomasses of Bacillariophyta and Chlorophyta. The very low values of N:P (on average 2.8 and 3.4) indicated strong nitrogen limitation. The Correspondence Canonical Analysis (CCA) showed that the central part of the lagoon could be defined as positively related to DIN and to N:P, and western part could be characterized by correlation with temperature, dissolved oxygen and SRP concentrations. Competition for the limited resources of Dissolved Inorganic Nitrogen in the western, shallower part of the lagoon was in favour of Cyanoprokaryota, to the detriment of other phytoplankton assemblages. In contrast, the Cyanoprokaryota biomass in the central part of the lagoon, where DIN concentrations were increased, was lower, and Bacillariophyta in particular prospered at their expense. Here, the competition for Soluble Reactive Phosphorus was not so clear-cut.
Biocontamination of the western Vistula Lagoon (south-eastern Baltic Sea, Poland)
OCEANOLOGIA, 2013
Non-native species exert considerable pressure on aquatic ecosystems; accordingly, they are treated as biopollutants. The Vistula Lagoon, one of the largest brackish water bodies in the Baltic, has become a part of the central corridor for hydrobionts migrating in the direction of western Europe and species expanding in inshore waters. Ten non-indigenous species of benthic invertebrates from five different biogeographical regions have been found in the western part of the Lagoon. Their considerable abundance relative to the numbers and abundance of native species testifies to the high level of biopollution there. The integrated biological
Non-native species exert considerable pressure on aquatic ecosystems; accordingly, they are treated as biopollutants. The Vistula Lagoon, one of the largest brackish water bodies in the Baltic, has become a part of the central corridor for hydrobionts migrating in the direction of western Europe and species expanding in inshore waters. Ten non-indigenous species of benthic invertebrates from five different biogeographical regions have been found in the western part of the Lagoon. Their considerable abundance relative to the numbers and abundance of native species testifies to the high level of biopollution there. The integrated biological
Ecological Engineering 36, 2010
The research on the Włocławek Reservoir (WR), situated on the Lower Vistula River (Poland), was carried out during two periods: between 1986 and 2002, hydrochemistry was studied, and between 1994 and 2000 – plankton. WR is 70 km2 in area, its capacity is 370 × 106 m3 and the retention time with the average flow rate (Q) amounts to 930 m3 s−1 – only 5 days (!). Until 2002, due to cyclic work of a hydroelectric power plant, considerable variability in the daily flow rate was recorded (from 600 to 1800 m3 s−1). Its specific hydrology and fluvial character mean that WR functions in a completely different way compared to dam reservoirs described in textbooks, with significantly longer retention time.WR significantly improves most of the water quality variables in the river. It reduces the concentration of suspended matter (on average by more than 50%), Ptot (by 16%), BOD5 (by 40%) and chlorophyll “a” (by 50–60%) (unpublished data).Phytoplankton is rich in species – altogether 441 taxa, with the count of 7.4 × 106 individuals per dm−3 and biomass of 16 mg dm−3. Throughout the research period, a significant reduction in the abundance of phytoplankton was recorded in WR, sometimes more than 60%. The total number of zooplankton taxa at the site upstream from WR and in the reservoir was almost identical (68 and 67), however in the reservoir itself, a small decrease in the number of Rotifera species and an increase in the number of Crustacea species was observed, as well as a significant, fourfold increase in the total zooplankton biomass. The aforementioned reduction of phytoplankton and enrichment of the river with Crustacea are one of the major biocenotic consequences of the functioning of the Włocławek Reservoir.
Studies of phltoplankton were carried out in the years 1994/1995 ovef a 103-km reach of the lower Vistula between Plock and Torui. Within that reach is situated a strongly rheolimnic dam reservoir with a rctention time of 4 5 days, the Woclawek Reservoir. In species composition, numbers and biomass prevailed centric diatoms,and Chlorcphyc€ae oftheorder Chlorococcales, whose abundance was evidence of high trophy of the river rcach under study. The damming up ofthe water was conducive to a reduction in the numbers of phltoplankton by a ca 20%, but did not affect the wealth of species. Immense time variability, resulting ftom the hydrological variability of the Vistula waters, was obse ed at all stations.
Oceanologia, 2020
Summary Phytoplankton community structure was studied from 2002 to 2016 in the Vistula Lagoon (southern Baltic Sea) in the context of the 2010 shift in its population, as well as the reason for this shift and its environmental impact. This evident shift was indicated by Multidimensional Scaling at the Bray Curtis similarity level of 31%. Before 2010, the primary components of phytoplankton were Cyanobacteria (up to 98% of the biomass, October 2007) and Chlorophyta (40%, July 2002). After 2010, the contribution of Cyanobacteria considerably decreased, and the proportions of other phyla increased. The total phytoplankton biomass positively correlated with phosphorus, and Cyanobacteria biomass with silica. Evident changes were also observed in the seasonal dynamics of phytoplankton. Before 2010, the highest values of biomass occurred in autumn, and were related to high biomass of Cyanobacteria. Higher biomass has been recently reached in spring, during the dominance of Ochrophyta associated with Chlorophyta, Charophyta, and Cryptophyta. Generalised additive models showed a significant decreasing trend of the total phytoplankton biomass, Cyanobacteria, Chlorophyta, and flagellates, suggesting a decrease in eutrophication. This trend is concurrent with a considerable increase in the ratio of zooplankton to phytoplankton biomass since 2010. The increased ratio, however, did not result from elevated zooplankton biomass, but from the drop in phytoplankton biomass. Therefore, the most probable reason for the decrease in phytoplankton biomass was the simultaneous decrease in the concentration of all nutrients. The potential additional impact of filtration by a new alien bivalve Rangia cuneata G. B. Sowerby I, 1832 is also discussed.
Periodicum Biologorum, 2014
Background and Purpose: Lake Vrana is shallow, Mediterranean, karstic lake, where water salinity is as an important ecological factor, because the lake is directly connected with the Adriatic Sea. Studies concerning zooplankton communities in these ecosystems are very scarce. To understand this very specific and unique ecosystem, the physical and chemical parameters and the makrozooplankton community structure in Lake Vrana were studied. Material and Methods: The investigation was conducetd monthly from January till December 2004 at four stations with different ecological characteristics (primarily depth, salinity, hydrology, nutrients supply). Chlorophyll a concentration was analyzed fluorometrically according to Method 445.0. Physical and chemical parameters (temperature, transparency, chlorinity, salinity, biological oxygen demand-BOD, dissolved oxygen-DO, ortho-phosphate, total phosphorus, chlorophyll a) were measured according to APHA. Data on environmental variables and makrozooplankton community were examined using Redundancy Analysis (RDA). Results: Among the 13 different species which are found in macrozooplankton community of Lake Vrana, the dominant species were Calanipeda aquedulcis Kritchagin (Copepoda), and Bosmina longirostris O.F. Műller, (Cladocera) which were present in all four stations during study period. The same occurring had Megacyclops gigas Claus, Alona sp., Alonella excisa Fischer, and Chydorus sphaericus O.F. Műller while other species appeared sporadically. The physical-chemical parameters showed temporal and spatial variations in Lake Vrana during study period resulting in different micro-habitat conditions on the studied sites. That is confirmed by the results of the RDA analysis that clearly shows the separation of stations due to the impact of studied indicators. According to multivariate analysis temperature, chlorophyll a and salinity have great influence on dynamics and structure of makrozooplankton in Lake Vrana. Conclusions: Temperature, chlorophyll a and salinity are ecological factors which define the development as well as dynamics and structure of macrozooplankton community in the Vrana Lake.