Magdalena Bowszys - Academia.edu (original) (raw)
Papers by Magdalena Bowszys
2011 SAMPE Spring Technical Conference and Exhibition - State of the Industry: Advanced Materials, Applications, and Processing Technology, Aug 30, 2011
Fisheries & Aquatic Life, 2021
The aim of this study was to assess the species composition and structure of zooplankton and fish... more The aim of this study was to assess the species composition and structure of zooplankton and fish communities in lakes with similar ecological conditions that are connected by periodic streams. This was done by assessing the relative importance of local biotic and abiotic interactions associated with the species composition and structure of the zooplankton and fish communities. The study was conducted in three small, soft water lobelia lakes located in the source area of the Brda River, which were characterized by low trophic statuses and similar depths. A total of 15 Rotifera taxa, 18 Cladocera taxa, and nine Copepoda taxa were identified in the lakes analyzed. The lake zooplankton communities differed in species richness, total density, and biomass, while the Shannon–Wiener diversity indexes of the zooplankton communities were similar. Of the three lakes analyzed, the faunal similarity index was the highest in Lake Smołowe. Comparisons of the three lakes indicated there was greate...
Water, 2021
The objective of this study was to analyze variations in the planktonic rotifer community in a la... more The objective of this study was to analyze variations in the planktonic rotifer community in a lake subjected to hypolimnetic withdrawal. The present study is also the first attempt to estimate the effects of changes in hypolimnion water withdrawal rates on the zooplankton community. The lake is located in northeastern Poland. Zooplankton were sampled in 1986, 2004 and 2013. Standard protocols of zooplankton sampling and elaboration were applied. Rotifer abundance, wet biomass, community structure, and species diversity were studied at different intensities of hypolimnetic water withdrawal. Trophic state indices based on rotifer abundance and species structure were used to evaluate changes in the trophic state of the lake. Our results showed increased planktonic rotifer species diversity over a period of years, which was a positive outcome of the restoration measures. Lower hypolimnetic withdrawal rates seemed to favor the development of a diverse rotifer community. Conversely, qual...
Knowledge & Management of Aquatic Ecosystems, 2020
Restoring lakes with hypolimnetic withdrawal can severely threaten water quality and biocenosis d... more Restoring lakes with hypolimnetic withdrawal can severely threaten water quality and biocenosis downstream. The objective of this study was to evaluate the effect of lake restoration on riverine zooplankton during a period of intense hypolimnion water inflow. Zooplankton density and biomass were determined in water samples. The water samples were also analyzed to determine the following physicochemical parameters: flow rate, dissolved oxygen, hydrogen sulphide, sulphate, ammonium nitrogen, nitrate nitrogen, total phosphorous, soluble reactive phosphorus, total organic carbon, and temperature. The results of multiple regression indicated that water flow was the most significant variable and was the best predictor of total zooplankton and rotifer density. Soluble reactive phosphorous was the main predictor of copepod biomass and density. Our study showed that hypolimnetic withdrawal disturbed the natural process of planktic community transformation, which was linked to the environment...
Chemistry and Ecology, 2020
ABSTRACT Zooplankton are an important link between trophic levels in aquatic ecosystems, and thei... more ABSTRACT Zooplankton are an important link between trophic levels in aquatic ecosystems, and their response to organic carbon is likely to have broad implications for lake food webs. The main objective of the research was to determine variations in zooplankton communities against the background of the structural heterogeneity of the lake and to link the observed patterns to the organic carbon content of the lake water. Spatial differences were noted in the organic carbon content of the lake water. Higher total organic carbon (TOC) and dissolved organic carbon (DOC) concentrations were recorded in the vegetated littoral area than in the lake pelagic zone. Zooplankton distribution and response to organic carbon content varied among habitats. At sites covered by plants, DOC and the bacterial sized fraction of particulate organic carbon were positively correlated with zooplankton biomass. In reeds, the grazing pressure by zooplankton on bacterial sized organic carbon was particularly strong. This implied that the microbial carbon link could be an important food web component providing carbon to higher trophic levels in areas covered by plants. This assumption corresponded well with the results of redundancy analysis (RDA).
Fisheries Management and Ecology, 2020
Oceanologia, 2017
The instability of environmental conditions is a typical feature of brackish waters such as estua... more The instability of environmental conditions is a typical feature of brackish waters such as estuaries or lagoons (Cognetti and Maltagliati, 2000). Changes in abiotic factors are reflected in the biochemical activity of both vertebrates and invertebrates. These factors determine the rate of metabolic transformations, the efficacy of immune systems, and reaction patterns of bodies to stressors (Kinne, 1964; Roddie et al., 1984). Studies to date of the Vistula Lagoon have focused on the physicochemical characters of the water (Nawrocka and
Journal of Limnology, 2016
Knowledge and Management of Aquatic Ecosystems, 2014
Water eutrophication is associated with an increase in the organic carbon content (both particula... more Water eutrophication is associated with an increase in the organic carbon content (both particulate and dissolved forms), which may affect the functioning of the zooplankton community. Mesotrophic and eutrophic lakes in the Masurian Lake District (Poland) were selected to evaluate the relationship between the organic carbon level and the zooplankton community. The lakes differed significantly in most environmental variables. RDA analysis was performed to evaluate the impact of environmental variables on zooplankton. The variables that significantly explained the variance in the zooplankton community abundance (Monte Carlo permutation test) included dissolved and particulate organic carbon, Secchi disc visibility, soluble reactive phosphorus and total nitrogen. The response of zooplankton to an increasing level of organic carbon is functional rather than quantitative. In the mesotrophic system, the results of the redundancy analysis indicated relatively strong positive relationships between dissolved organic carbon and zooplankton biomass, and negative correlations between chlorophyll a and zooplankton biomass. The above suggests that indirect organic carbon utilization by zooplankton could partly compensate for the poor feeding conditions of planktonic animals (decreased phytoplankton availability). In the eutrophic lake, elevated organic carbon levels are partly limited by zooplankton, which is suggested by the positive relationship between particulate organic matter and the total zooplankton biomass (RDA results). The positive relationship between the biomass of copepods and organic carbon in particulate and dissolved forms implies that copepods benefit from the increased heterotrophic carbon flow that is activated in the eutrophic lake. RÉSUMÉ Réponse du zooplancton au niveau de carbone organique dans des lacs de statuts trophiques différents
Ochrona Środowiska
Abstract: Causes and effects of changes in structure and growth of phytoplankton in Lake Kortowsk... more Abstract: Causes and effects of changes in structure and growth of phytoplankton in Lake Kortowskie (Olsztyn, Poland) were presented, under the conditions of blue-green algae dominance and increase in their stability of occurrence. Specific adaptation abilities of the blue-green algae which could have an impact on this phenomenon, but also could be a limiting factor in occurrence and growth of other algal groups, were analyzed. Qualitative and quantitative phytoplankton analysis for Lake Kortowskie was performed and applied as a basis for the planktonic algae dominance structure and stability of occurrence determination. As a result, a significant increase in the blue-green algae stability and dominance was demonstrated. It was established that under these conditions stability level and growth of other planktonie algae groups gradually decreased. The increasing dominance and stability of the blue-green algae in the lake contributed to shifts in the taxonomic structure and affected g...
In a mesotrophic, shallow, macrophyte-dominated lake, stable plant cover can be attractive for zo... more In a mesotrophic, shallow, macrophyte-dominated lake, stable plant cover can be attractive for zooplankton species being a grazer or a prey; dense submerged vegetation, Chara beds in particular, can offer a day-time refuge for cladocerans and some adult copepods. The former use this shelter also at night; on the contrary, young stages of Copepoda distinctively avoided both types of plant covered areas during the day and migrated towards open water. That might resulted from the increased grazing upon zooplankton. The pressure of predatory fish in open water probably forced young fish to seek for a shelter. As Chara beds are too dense to be penetrated, they preferred emergent plant zone. That might encourage copepods to undertake reversed DHM. The present study suggests a significant role of plant cover on diurnal zooplankton distribution. Dense charophyte patches could offer a daytime refuge for cladocerans, and some adult forms of Copepoda, while both groups of planktonic invertebra...
Archives of Polish Fisheries, 2014
The objective of the study was to identify seasonal changes in phytoplankton taxonomic structure ... more The objective of the study was to identify seasonal changes in phytoplankton taxonomic structure and development rates to characterize phytoplankton communities as determinants of the trophic and ecological conditions of Lake Kortowskie in northeast Poland which has been undergoing restoration with selective hypolimnetic withdrawal. The lake was designated as being of high trophic state and bad ecological status based on intense phytoplankton growth, the strong dominance and persistent occurrence of blue-green algae, and seasonal modifications in phytoplankton taxonomic structure and assemblage growth rates. The ecological status of the lake assessed in 2011 corresponds to that determined in 1987-1990 and 1999 and indicates that eutrophication in Lake Kortowskie is progressing.
Ecohydrology & Hydrobiology, 2012
Ecohydrology & Hydrobiology, 2009
Italian Journal of Animal Science, 2013
ABSTRACT The aim of this study was to evaluate a procedure of weighing live fish larvae and to de... more ABSTRACT The aim of this study was to evaluate a procedure of weighing live fish larvae and to determine its impact on the survival and growth rates based on the example of ide Leuciscus idus (L.). A 14-day rearing was conducted. Larvae were randomly divided into two groups - control (C) and experimental (E). During the experiment, 10% of larvae from the E group were sampled and weighed (with experimental method) daily. An integral part of weighing method was to place the anaesthetized larvae onto a nylon net platform. The platform with larvae was then dried on the blotting paper and next weighed together with larvae. The weight of the larvae was calculated by deducting the weight of the platform from the total weight recorded. After weighing, the fish were returned to the rearing tank. Fish from the control group were not manipulated during the whole experiment. At the end of the experiment 90 randomly chosen fish from each group were measured and weighted. No significant differences were recorded in larvae survival, weight and length (91.33 +/- 4.73%; 41.69 +/- 10.70 mg; 17.56 +/- 1.44 mm and 94.00 +/- 4.00%; 49.40 +/- 10.79 mg; 18.41 +/- 1.24 mm in E group and C group, respectively). Significant differences were recorded in case of SGR that reached 15.80 +/- 0.29 in C group and 14.60 +/- 0.17 in E group. The described method may be a useful tool for determining fish larvae weight. Although it requires conducting further researches in order to establish the influence of accompanying factors such as e. g. kind and concentration of anaesthetic.
ARCHIWUM …, 2007
ABSTRACT. The aim of the study was to present selected issues concerning the feeding of adult ven... more ABSTRACT. The aim of the study was to present selected issues concerning the feeding of adult vendace, Coregonus albula (L.) in Lake Wigry. Seasonal changes in dietary composition, feeding intensity, and vendace preferences for the most important prey taxa were determined. ...
2011 SAMPE Spring Technical Conference and Exhibition - State of the Industry: Advanced Materials, Applications, and Processing Technology, Aug 30, 2011
Fisheries & Aquatic Life, 2021
The aim of this study was to assess the species composition and structure of zooplankton and fish... more The aim of this study was to assess the species composition and structure of zooplankton and fish communities in lakes with similar ecological conditions that are connected by periodic streams. This was done by assessing the relative importance of local biotic and abiotic interactions associated with the species composition and structure of the zooplankton and fish communities. The study was conducted in three small, soft water lobelia lakes located in the source area of the Brda River, which were characterized by low trophic statuses and similar depths. A total of 15 Rotifera taxa, 18 Cladocera taxa, and nine Copepoda taxa were identified in the lakes analyzed. The lake zooplankton communities differed in species richness, total density, and biomass, while the Shannon–Wiener diversity indexes of the zooplankton communities were similar. Of the three lakes analyzed, the faunal similarity index was the highest in Lake Smołowe. Comparisons of the three lakes indicated there was greate...
Water, 2021
The objective of this study was to analyze variations in the planktonic rotifer community in a la... more The objective of this study was to analyze variations in the planktonic rotifer community in a lake subjected to hypolimnetic withdrawal. The present study is also the first attempt to estimate the effects of changes in hypolimnion water withdrawal rates on the zooplankton community. The lake is located in northeastern Poland. Zooplankton were sampled in 1986, 2004 and 2013. Standard protocols of zooplankton sampling and elaboration were applied. Rotifer abundance, wet biomass, community structure, and species diversity were studied at different intensities of hypolimnetic water withdrawal. Trophic state indices based on rotifer abundance and species structure were used to evaluate changes in the trophic state of the lake. Our results showed increased planktonic rotifer species diversity over a period of years, which was a positive outcome of the restoration measures. Lower hypolimnetic withdrawal rates seemed to favor the development of a diverse rotifer community. Conversely, qual...
Knowledge & Management of Aquatic Ecosystems, 2020
Restoring lakes with hypolimnetic withdrawal can severely threaten water quality and biocenosis d... more Restoring lakes with hypolimnetic withdrawal can severely threaten water quality and biocenosis downstream. The objective of this study was to evaluate the effect of lake restoration on riverine zooplankton during a period of intense hypolimnion water inflow. Zooplankton density and biomass were determined in water samples. The water samples were also analyzed to determine the following physicochemical parameters: flow rate, dissolved oxygen, hydrogen sulphide, sulphate, ammonium nitrogen, nitrate nitrogen, total phosphorous, soluble reactive phosphorus, total organic carbon, and temperature. The results of multiple regression indicated that water flow was the most significant variable and was the best predictor of total zooplankton and rotifer density. Soluble reactive phosphorous was the main predictor of copepod biomass and density. Our study showed that hypolimnetic withdrawal disturbed the natural process of planktic community transformation, which was linked to the environment...
Chemistry and Ecology, 2020
ABSTRACT Zooplankton are an important link between trophic levels in aquatic ecosystems, and thei... more ABSTRACT Zooplankton are an important link between trophic levels in aquatic ecosystems, and their response to organic carbon is likely to have broad implications for lake food webs. The main objective of the research was to determine variations in zooplankton communities against the background of the structural heterogeneity of the lake and to link the observed patterns to the organic carbon content of the lake water. Spatial differences were noted in the organic carbon content of the lake water. Higher total organic carbon (TOC) and dissolved organic carbon (DOC) concentrations were recorded in the vegetated littoral area than in the lake pelagic zone. Zooplankton distribution and response to organic carbon content varied among habitats. At sites covered by plants, DOC and the bacterial sized fraction of particulate organic carbon were positively correlated with zooplankton biomass. In reeds, the grazing pressure by zooplankton on bacterial sized organic carbon was particularly strong. This implied that the microbial carbon link could be an important food web component providing carbon to higher trophic levels in areas covered by plants. This assumption corresponded well with the results of redundancy analysis (RDA).
Fisheries Management and Ecology, 2020
Oceanologia, 2017
The instability of environmental conditions is a typical feature of brackish waters such as estua... more The instability of environmental conditions is a typical feature of brackish waters such as estuaries or lagoons (Cognetti and Maltagliati, 2000). Changes in abiotic factors are reflected in the biochemical activity of both vertebrates and invertebrates. These factors determine the rate of metabolic transformations, the efficacy of immune systems, and reaction patterns of bodies to stressors (Kinne, 1964; Roddie et al., 1984). Studies to date of the Vistula Lagoon have focused on the physicochemical characters of the water (Nawrocka and
Journal of Limnology, 2016
Knowledge and Management of Aquatic Ecosystems, 2014
Water eutrophication is associated with an increase in the organic carbon content (both particula... more Water eutrophication is associated with an increase in the organic carbon content (both particulate and dissolved forms), which may affect the functioning of the zooplankton community. Mesotrophic and eutrophic lakes in the Masurian Lake District (Poland) were selected to evaluate the relationship between the organic carbon level and the zooplankton community. The lakes differed significantly in most environmental variables. RDA analysis was performed to evaluate the impact of environmental variables on zooplankton. The variables that significantly explained the variance in the zooplankton community abundance (Monte Carlo permutation test) included dissolved and particulate organic carbon, Secchi disc visibility, soluble reactive phosphorus and total nitrogen. The response of zooplankton to an increasing level of organic carbon is functional rather than quantitative. In the mesotrophic system, the results of the redundancy analysis indicated relatively strong positive relationships between dissolved organic carbon and zooplankton biomass, and negative correlations between chlorophyll a and zooplankton biomass. The above suggests that indirect organic carbon utilization by zooplankton could partly compensate for the poor feeding conditions of planktonic animals (decreased phytoplankton availability). In the eutrophic lake, elevated organic carbon levels are partly limited by zooplankton, which is suggested by the positive relationship between particulate organic matter and the total zooplankton biomass (RDA results). The positive relationship between the biomass of copepods and organic carbon in particulate and dissolved forms implies that copepods benefit from the increased heterotrophic carbon flow that is activated in the eutrophic lake. RÉSUMÉ Réponse du zooplancton au niveau de carbone organique dans des lacs de statuts trophiques différents
Ochrona Środowiska
Abstract: Causes and effects of changes in structure and growth of phytoplankton in Lake Kortowsk... more Abstract: Causes and effects of changes in structure and growth of phytoplankton in Lake Kortowskie (Olsztyn, Poland) were presented, under the conditions of blue-green algae dominance and increase in their stability of occurrence. Specific adaptation abilities of the blue-green algae which could have an impact on this phenomenon, but also could be a limiting factor in occurrence and growth of other algal groups, were analyzed. Qualitative and quantitative phytoplankton analysis for Lake Kortowskie was performed and applied as a basis for the planktonic algae dominance structure and stability of occurrence determination. As a result, a significant increase in the blue-green algae stability and dominance was demonstrated. It was established that under these conditions stability level and growth of other planktonie algae groups gradually decreased. The increasing dominance and stability of the blue-green algae in the lake contributed to shifts in the taxonomic structure and affected g...
In a mesotrophic, shallow, macrophyte-dominated lake, stable plant cover can be attractive for zo... more In a mesotrophic, shallow, macrophyte-dominated lake, stable plant cover can be attractive for zooplankton species being a grazer or a prey; dense submerged vegetation, Chara beds in particular, can offer a day-time refuge for cladocerans and some adult copepods. The former use this shelter also at night; on the contrary, young stages of Copepoda distinctively avoided both types of plant covered areas during the day and migrated towards open water. That might resulted from the increased grazing upon zooplankton. The pressure of predatory fish in open water probably forced young fish to seek for a shelter. As Chara beds are too dense to be penetrated, they preferred emergent plant zone. That might encourage copepods to undertake reversed DHM. The present study suggests a significant role of plant cover on diurnal zooplankton distribution. Dense charophyte patches could offer a daytime refuge for cladocerans, and some adult forms of Copepoda, while both groups of planktonic invertebra...
Archives of Polish Fisheries, 2014
The objective of the study was to identify seasonal changes in phytoplankton taxonomic structure ... more The objective of the study was to identify seasonal changes in phytoplankton taxonomic structure and development rates to characterize phytoplankton communities as determinants of the trophic and ecological conditions of Lake Kortowskie in northeast Poland which has been undergoing restoration with selective hypolimnetic withdrawal. The lake was designated as being of high trophic state and bad ecological status based on intense phytoplankton growth, the strong dominance and persistent occurrence of blue-green algae, and seasonal modifications in phytoplankton taxonomic structure and assemblage growth rates. The ecological status of the lake assessed in 2011 corresponds to that determined in 1987-1990 and 1999 and indicates that eutrophication in Lake Kortowskie is progressing.
Ecohydrology & Hydrobiology, 2012
Ecohydrology & Hydrobiology, 2009
Italian Journal of Animal Science, 2013
ABSTRACT The aim of this study was to evaluate a procedure of weighing live fish larvae and to de... more ABSTRACT The aim of this study was to evaluate a procedure of weighing live fish larvae and to determine its impact on the survival and growth rates based on the example of ide Leuciscus idus (L.). A 14-day rearing was conducted. Larvae were randomly divided into two groups - control (C) and experimental (E). During the experiment, 10% of larvae from the E group were sampled and weighed (with experimental method) daily. An integral part of weighing method was to place the anaesthetized larvae onto a nylon net platform. The platform with larvae was then dried on the blotting paper and next weighed together with larvae. The weight of the larvae was calculated by deducting the weight of the platform from the total weight recorded. After weighing, the fish were returned to the rearing tank. Fish from the control group were not manipulated during the whole experiment. At the end of the experiment 90 randomly chosen fish from each group were measured and weighted. No significant differences were recorded in larvae survival, weight and length (91.33 +/- 4.73%; 41.69 +/- 10.70 mg; 17.56 +/- 1.44 mm and 94.00 +/- 4.00%; 49.40 +/- 10.79 mg; 18.41 +/- 1.24 mm in E group and C group, respectively). Significant differences were recorded in case of SGR that reached 15.80 +/- 0.29 in C group and 14.60 +/- 0.17 in E group. The described method may be a useful tool for determining fish larvae weight. Although it requires conducting further researches in order to establish the influence of accompanying factors such as e. g. kind and concentration of anaesthetic.
ARCHIWUM …, 2007
ABSTRACT. The aim of the study was to present selected issues concerning the feeding of adult ven... more ABSTRACT. The aim of the study was to present selected issues concerning the feeding of adult vendace, Coregonus albula (L.) in Lake Wigry. Seasonal changes in dietary composition, feeding intensity, and vendace preferences for the most important prey taxa were determined. ...