Aleksandra Pełechata

Aleksandra Pełechata
Adam Mickiewicz University | UAM · Institute of Environmental Biology

PhD

About

56
Publications
18,349
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559
Citations
Additional affiliations
October 2015 - present
Adam Mickiewicz University · Institute of Environmental Biology
Position
  • PhD
September 2000 - September 2015
Adam Mickiewicz University
Position
  • Lecturer

Publications

Publications (56)
Article
A significant portion of calcium carbonate is deposited in lake sediments as a result of biological processes related to the photosynthetic activity of phytoplankton in the pelagic realm and, in addition, macrophytes in the littoral zone. Lake Wigry, one of the largest lakes in Poland (north-east Poland), is characterized by: (i) carbonate sediment...
Article
For practical reasons, cyanobacteria attract scientific interest in eutrophicated, often degraded water bodies. Much less attention is paid to blue-greens in less fertilized lakes, including a group of macrophytic lakes with vegetation dominated by charophytes (Chara-lakes). In this study, therefore, two small, mid-forest Chara-lakes with negligibl...
Article
Full-text available
The aim of this work was to present a quantitative and qualitative analysis of a phytoplankton assemblage under the influence of Ceratophyllum demersum L. during a two-year field study. Literature data obtained under laboratory conditions indicate that C. demersum may cause a decrease in the blue-green algae biomass, which is considered to be evide...
Article
Full-text available
Organism dispersal is nowadays highly driven by human vectors. This also refers to the aquatic organisms that can often silently spread in and invade new waters, especially when human vectors of dispersal act without brakes. Thus, it is mandatory to continuously identify human-mediated mechanisms of organism dispersal and implement proper biosecuri...
Article
Full-text available
To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and tot...
Article
Full-text available
The recovery or reconstruction of aquatic vegetation has recently been reported as a result of water quality improvement after anthropogenic eutrophication. The objectives of this study were: to investigate long-term trends in aquatic vegetation abundance in relation to decreasing water fertility and to present new directions in changes of the subm...
Article
Full-text available
We conducted year-round, monthly monitoring of the stable isotope composition of DIC and water in hypereutrophic Lake Kierskie, western Poland, along with isotope measures of calcite collected in sediment traps installed at 16 and 30 m water depth in the lake. Isotope data were supplemented by previously published data on physico-chemical variables...
Article
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Accurate lake sediment-derived palaeoenvironmental reconstructions require in-depth knowledge on sediment record formation processes. In order to understand formation of laminated sediments in the eutrophic Lake Kierskie (western Poland) we conducted a year-round (November 2015–October 2016), monthly sediment trap study along with physico-chemical...
Article
Full-text available
Four Chara lakes, differing in their morphological features, physico-chemical water properties, catchment area characteristics and human pressure, were studied in order to recognize the influence of the charophyte PVI, proportion in the phytolittoral zone and species composition on phytoflagellate community. In one lake, the proportion of vegetatio...
Article
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent probl...
Article
Full-text available
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent probl...
Conference Paper
Full-text available
In urban Lake Kierskie (Western Poland) distinct, however discontinuous, varve deposits were observed in the lower and uppermost Holocene sediment sequence. Varves occurring in the uppermost 50 cm of the sediment sequence are linked with man induced eutrophication of the lake. To recognize the conditions of these varves deposition sediment traps we...
Poster
Full-text available
In aquatic environment submerged macrophytes are a key contributor to the circulation of elements, particularly of carbon, which is transformed from assimilated CO2 into the plant biomass. Organic carbon can subsequently be deposited in the bottom sediment and it can potentially become largely unavailable in a time perspective longer than the annua...
Article
Full-text available
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to thei...
Article
Full-text available
Insight into how environmental change determines the production and distribution ofcyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus onhepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g.,anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their p...
Conference Paper
Full-text available
Out of six genera representing extant charophytes (Characeae) Lychnothamnus (Ruprecht) Leonhardi em. A. Braun is a monotypic genus, represented by the only extant species, Lychnothamnus barbatus (Meyen) Leonhardi. About 50 sites of L. barbatus are known currently and more than 60 localities have disappeared since the end of the 19th century, mainly...
Conference Paper
There is still little known about cyanobacteria in oligo- and mesotrophic hard-water lakes dominated by charophyte vegetation (Chara-lakes). In such ecosystems, through various mechanisms (e.g. nutrient trapping, intensified sedimentation of particles from the water column and discharge of allelopathic substances), charophytes affect the qualitativ...
Conference Paper
Full-text available
Out of six genera representing extant charophytes (Characeae) Lychnothamnus (Ruprecht) Leonhardi em. A. Braun is a monotypic genus. Today it is represented by the only extant species, Lychnothamnus barbatus (Meyen) Leonhardi, considered rare and in decline worldwide. More than 60 localities of L. barbatus have disappeared since the end of the 19th...
Poster
Full-text available
Jeziorko Czerniakowskie is a shallow (max depth 4 m), eutrophic lake with a surface area of 14.6 ha. The lake is located in the area of a former Vistula flood plain in Warsaw, 2 km far from the Vistula River. As the lake is located in the city, 1 km from the Siekierki power plant, it is under high anthropogenic pressure. It results in a permanent l...
Poster
Full-text available
Phycological studies of Lake Jarosławieckie (Wielkopolski National Park) dates back to the early 1950s of the twentieth century, and initially focused on charophytes. The first comprehensive hydrobiological studies, including phytoplankton research, were carried out in the 1970s of the last century. Since the 1990s the frequency and range of studie...
Conference Paper
Full-text available
Jeziorko Czerniakowskie (surface area of 14,6 ha) is a shallow (max. depth 4.0 m), eutrophic lake, located in the area of former Vistula flood plain in Warsaw. Lack of river flooding, urbanization of the catchment and cone of depression caused by activity of nearby power plant contribute to reduction of the water level in the lake. Despite its smal...
Book
Full-text available
W monografii zawarto wyniki kompleksowych badań jezior Wielkopolskiego Parku Narodowego i jego otuliny, obejmujące analizę parametrów biotycznych i abiotycznych. Badania parametrów biotycznych dotyczyły składu jakościowego i ilościowego fitoplanktonu, fitobentosu, makrofitów, zooplanktonu, zoobentosu i ichtiofauny. Warunki abiotyczne jezior obejmow...
Conference Paper
Full-text available
Formy wiciowe w fitoplanktonie jezior ramienicowych Aleksandra Pełechata1, Mariusz Pełechaty2, Andrzej Pukacz3 1 Uniwersytet im. A. Mickiewicza, Collegium Polonicum, ul. Kościuszki 1, 69-100 Słubice; e-mail: ola.p@amu.edu.pl 2 Uniwersytet im. A. Mickiewicza, Zakład Hydrobiologii, ul. Umultowska 89, 61-614 Poznań 3 Uniwersytet im. A. Mickiewicza,...
Conference Paper
Full-text available
Zaburzenie stratyfikacji jeziora meromiktycznego jako efekt ekstremalnych zjawisk pogodowych i jego wpływ na zbiorowisko fitoplanktonu Aleksandra Pełechata1, Mariusz Pełechaty2, Andrzej Pukacz3 1 Uniwersytet im. A. Mickiewicza, Collegium Polonicum, ul. Kościuszki 1, 69-100 Słubice; e-mail: ola.p@amu.edu.pl 2 Uniwersytet im. A. Mickiewicza, Wydział...
Conference Paper
Dynamika fitoplanktonu płytkiego jeziora ramienicowego jako efekt ekstremalnych zim Aleksandra Pełechata1, Mariusz Pełechaty2, Andrzej Pukacz3 1 Uniwersytet im. A. Mickiewicza, Collegium Polonicum, ul. Kościuszki 1, 69-100 Słubice; e-mail: ola.p@amu.edu.pl 2 Uniwersytet im. A. Mickiewicza, Wydział Biologii, Zakład Hydrobiologii, ul. Umultowska 89,...
Conference Paper
Full-text available
Chrysophyceae occur in clear fresh waters of low nutrient concentrations, preferring spring and autumn months. Along with other representatives of flagellates, Chrysophyceae are the main component of phytoplankton in macrophyte lakes, especially those dominated by charophyte vegetation. The aims of this study was to describe the species composition...
Article
Full-text available
In this work, the authors examined the presence of cyanobacteria and cyanotoxins in 21 samples collected from fresh water bodies located in 5 provinces in Poland: Lublin (2), Podlasie (1), Pomerania (6), Warmia-Masuria (1) and Wielkopolska (11). In addition, to determine the general pattern of geographical distribution, frequency of cyanobacteria o...
Article
Full-text available
Interdisciplinary investigations of 39 lakes of the Lubuskie Lakeland (mid-Western Poland) were undertaken in the vegetation seasons 2002–2009. The aim of presented study was to characterize the significance of charophytes as indicators of habitat differentiation of lakes using the number of species, number of communities and the percentage share i...
Conference Paper
Full-text available
At the peak of the growth season 2012, interdisciplinary field studies of 29 aquatic ecosystems were carried out in the Wielkopolska (Great Poland) National Park, Western Poland. The samples for physico-chemical and algological analyses were collected from lakes, ponds, oxbow lakes and waterways of the Park and its protection zone. Two alien specie...
Conference Paper
Full-text available
Do charophytes influence the phytoplankton community structure under the “in situ” conditions? Aleksandra Pełechata1, Mariusz Pełechaty2, Andrzej Pukacz1 1Adam Mickiewicz University - Europa-Universität Viadrina, Collegium Polonicum, Kościuszki 1, 69-100 Słubice, e-mail: ola.p@amu.edu.pl 2Adam Mickiewicz University, Faculty of Biology, Department o...
Article
Teren Wielkopolskiego Parku Narodowego obejmuje 17 jezior, zróżnicowanych pod względem powierzchni zlewni i lustra wody, objętości wód, głębokości, ukształtowania misy jeziornej, stanu troficznego, biologicznego i ekologicznego. Pierwsze informacje na temat różnorodności morfometrycznej jezior z tego terenu pochodzą z lat 1908-1920 (Schutze 1908, 1...
Chapter
Full-text available
Badania zmienności sezonowej fitoplanktonu Jeziora Góreckiego (Wielkopolski Park Narodowy) prowadzono od kwietnia do grudnia 2007 roku. Stwierdzono wysokie wartości koncentracji chlorofilu-a (11,30-72,22 ug/l, średnia dla całego okresu badan 38,02 ug/l) oraz biomasy fitoplanktonu (1,90-36,50 mg/l, średnia 16,69 mg/l). Zbiorowisko fitoplanktonu zdom...
Article
Full-text available
In the vegetation seasons 2001-2005 phytocoenotic and habitat investigations of 33 lakes located on Ziemia Lubuska region (mid-Western Poland) were carried out. Based on statistical analysis, investigated lakes were divided into two groups, significantly distinguished as regards the cover and maximum depth extent of hydromacrophytes. It vas reveale...
Article
Multidisciplinary investigations of 30 lakes (mid-Western Poland) were carried out in the years 2001–2004. Micro- and macrophyte vegetation was studied against the background of abiotic conditions. Significantly higher biomass of phytoplankton was found in nutrient rich shallow lakes without both charophyte and vascular submersed vegetation as well...
Article
Full-text available
In the summer seasons 2001 - 2004, water samples were collected in 25 shallow lakes in the area of the Lubuskie Lakeland (mid-westem Poland). These investigations were the first detailed studies of phytoplankton in this part of Poland. A total of 73 taxa of Cyanoprokaryota were found. Two water blooms of Cyanoprokaryota were documented, with extrem...
Article
Full-text available
Measurements of physico-chemical and biological parameters (transparency, total phosphorus, total nitrogen, phytoplankton biomass) made in summer periods in 33 lakes of Lubuskie Lakeland have shown that according to foreign and polish classifications, including Carlson's trophic state index, the majority of them are eutrophic. Shallow, polymictic l...
Article
Full-text available
In the vegetation seasons 2001–2004 phytocoenotic and habitat investigations of 30 lakes located on Lubuskie Lakeland (mid-Western Poland) were carried out. Based on statistical analysis, investigated lakes were divided into two groups, significantly distinguished as regards the phytocoenetic diversity. The results obtained demonstrate that among a...
Article
Full-text available
This study was aimed at recognizing the levels of arsenic, antimony and selenium concentrations in dif- ferent zones of the lake ecosystem. Total content as well as inorganic species of the studied metalloids were considered. Shallow Lake Jarosławieckie (Wielkopolski National Park) was chosen for the study reported. Water samples were collected in...
Article
Full-text available
Regarding their distribution in lakes, Chara delicatula and Chara globularis are considered species of different or even opposite ecological requirements. C. delicatula is usually reported from oligotrophic lakes, but C. globularis from more fertile ones. Within Poland, both species rarely build extensive stands in the same ecosystem. The present s...
Article
Full-text available
Based on field investigations carried out into mid-forest Lake Lubińskie (Lubuskie Lakeland) in July, November and December 2003 a rare meromictic status was stated. Qualitative and quantitative structure with higher abundance and biomass of phytoplankton (and significant contribution of dinophytes) in the surface layer, and a large share of the di...
Article
Full-text available
The aim of the study is to characterize the current trophic status and mixing type of Lake Jarosławieckie, an ecosystem protected within the boundaries of the Wielkopolski National Park and, although, subject to anthropopressure resulting from its recreational use. The trophy level was recognized based on two-year study carried out in different sea...
Article
Full-text available
We determined the variety of chlorococcalean algae in the total phytoplankton in four shallow lakes with different surface areas but having a similar average depth: Lebsko, Gardno, Dolgie Wielkie and Dolgie Male located in the Slowinski National Park, close to the Baltic Sea. Water samples for phytoplankton analyses were obtained from the surface z...
Article
Full-text available
The aim of this study was to characterize the spatial and temporal variability of total organic carbon concentrations in a shallow, eutrophic lake (Lake Jarosławieckie, the Wielkopolski National Park, mid- western Poland) against the background of lake habitat heterogeneity. The interrelations between TOC and chlorophyll a in different studied site...

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Projects

Projects (4)
Project
Aim: to compare the amount of carbon fixed and then deposited in the sediments of lakes by the communities of submerged vascular plants and of macroscopic algae from the group of charophytes (Characeae). Hypothesis: Charophytes, thanks to their specific properties, are capable of permanently bind and accumulate in sediments significant amounts of carbon, and their effectiveness in this respect is higher compared to submerged vascular plants. Financed by: National Science Centre Poland.
Project
This project aims at understanding the mechanisms regulating carbon and methane cycling in lakes affected by increasing trophic status and global warming. Although methane fluxes have been studied in lakes for almost 40 years, the questions about importance of this gas as carbon and energy source for plankton have only recently been raised. The integration of plankton ecology, physical features of lakes and microbiology in this project will allow us to significantly augment the understanding of the ongoing mechanisms driving changes to carbon cycling in lake food webs..