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1

Characterization of phycotoxins produced by cyanobacteria

100%
Mazur-Marzec H.
Oceanological and Hydrobiological Studies
|
2006
|
tom 35
|
nr 1
2

The effect of cyanobacterial blooms in the Siemianowka Dam Reservoir on the phytoplankton structure in the Narew River

63%
Grabowska M., Mazur-Marzec H.
Oceanological and Hydrobiological Studies
|
2011
|
tom 40
|
nr 1
3

Vertical distribution of cyanobacteria biomass and cyanotoxin production in the polymictic Siemianowka Dam Reservoir (eastern Poland)

63%
Grabowska M., Mazur-Marzec H.
Archives of Polish Fisheries
|
2014
|
tom 22
|
nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Do toxic cyanobacteria blooms pose a threat to the Baltic ecosystem?

63%
Mazur-Marzec H., Plinski M.
Oceanologia
|
2009
|
tom 51
|
nr 3
293-319
Cyanobacteria, otherwise known as blue-green algae, are oxygenic, photosynthetic prokaryotes. They occur naturally in many fresh, marine and brackish waters worldwide and play an important role in global carbon and nitrogen cycles. In their long history, cyanobacteria have developed structures and mechanisms that enable them to survive and proliferate under different environmental conditions. In the Baltic Sea, the mass development of cyanobacteria is compounded by a high level of eutrophication. The dominant species in the Baltic, the filamentous Aphanizomenon flos-aquae and Nodularia spumigena, can fix dissolved atmospheric N2, as a result of which they can outcompete other phytoplankton organisms. Heterocystous, filamentous cyanobacteria also make a significant contribution to the internal nutrient loading in the Baltic. The blooms of N. spumigena are of particular concern, as this cyanobacterium produces nodularin (NOD), a hepatotoxic peptide. The concentration of the toxin in the sea is regulated mainly by dilution with uncontaminated water, photolysis, sorption to sediments and microbial degradation. The transfer of the toxin in the Baltic trophic chain through zooplankton, mussels, fish and birds has been reported, but biodilution rather than bioconcentration has been observed. Cyanobacterial blooms are thought to pose a serious threat to the ecosystem. Their harmful effects are related to the occurrence of a high biomass, oxygen depletion, a reduction in biodiversity, and the production of toxic metabolites.
5

Cyanobacterial blooms in the Gulf of Gdansk [Southern Baltic]: the main effect of eutrophication

51%
Jozwiak T., Mazur-Marzec H., Plinski M.
Oceanological and Hydrobiological Studies
|
2008
|
tom 37
|
nr 4
115-121
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Toxic cyanobacteria blooms in the Lithuanian part of the Curonian Lagoon

51%
Paldaviciene A., Mazur-Marzec H., Razinkovas A.
Oceanologia
|
2009
|
tom 51
|
nr 2
203-216
The phenomenon of cyanobacteria (blue-green algae) blooms in the Baltic and the surrounding freshwater bodies has been known for several decades.The presence of cyanobacterial toxic metabolites in the Curonian Lagoon has been investigated and demonstrated for the first time in this work (2006–07). Microcystis aeruginosa was the most common and widely distributed species in the 2006 blooms. Nodularia spumigena was present in the northern part of the Curonian Lagoon, following the intrusion of brackish water from the Baltic Sea; this is the first time that this nodularin-(NOD)-producing cyanobacterium has been recorded in the lagoon.W ith the aid of high-performance liquid chromatography (HPLC), four microcystins (MC-LR, MC-RR, MC-LY, MC-YR) and nodularin were detected in 2006.T he presence of these cyanobacterial hepatotoxic cyclic peptides was additionally confirmed by enzyme-linked immunosorbent assay (ELISA) and protein phosphatase inhibition assay (PP1).Micr ocystin-LR, the most frequent of them, was present in every sample at quite high concentrations (from <0.1 to 134.2 μg dm−3).I n 2007, no cyanobacterial bloom was recorded and cyanotoxins were detected in only 4% of the investigated samples.A comparably high concentration of nodularin was detected in the northern part of the Curonian Lagoon.I n one sample dimethylated MC-RR was also detected (concentration 7.5 μg dm−3).
7
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Bioaccumulation of microcystins in invasive bivalves: A case study from the boreal lagoon ecosystem

51%
Paldaviciene A., Zaiko A., Mazur-Marzec H., Razinkovas-Baziukas A.
Oceanologia
|
2015
|
tom 57
|
nr 1
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Bioactive metabolites produced by Spirulina subsalsa from the Baltic Sea

51%
Szubert K., Wiglusz M., Mazur-Marzec H.
Oceanologia
|
2018
|
tom 60
|
nr 3
9

Effect of two different Nodularia spumigena extracts on Danio rerio egg mortality and hatching time

51%
Tyminska A., Mazur-Marzec H., Graczyk M., Plinski M.
Oceanological and Hydrobiological Studies
|
2005
|
tom 34
|
nr Suppl.3
10

The potential causes of cyanobacterial blooms in Baltic Sea estuaries

51%
Plinski M., Mazur-Marzec H., Jozwiak T., Kobos J.
Oceanological and Hydrobiological Studies
|
2007
|
tom 36
|
nr 1
11
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Toxic Nodularia spumigena blooms in the coastal waters of the Gulf of Gdańsk: a ten-year survey

51%
Mazur-Marzec H., Krezel A., Kobos J., Plinski M.
Oceanologia
|
2006
|
tom 48
|
nr 2
In the Baltic Sea, summer blooms of the filamentous, nitrogen-fixing cyanobacterium Nodularia spumigena are favoured by high P concentrations at low N:P ratios and a salinity range of 5–13 PSU. The blooms are initiated by calm and sunny weather, an elevated surface water temperature and thermal stratification. The mass occurrence of N. spumigena in coastal waters is a matter of special concern, as the cyanobacterium produces nodularin, a potent pentapeptide hepatotoxin. In the Gulf of Gdańsk, the large-scale occurrence of N. spumigena was recorded for the first time in 1994. Blooms of a similar intensity occurred in 2001, 2003 and 2004. Nodularin concentrations in freeze-dried bloom samples varied from 0.01 to 4.01 mg g−1 d.w. In the coastal waters of the Gulf of Gdańsk, cell-bound nodularin concentrations in 2004 and 2005 attained maxima of 25 852±107 μg dm−3 and 3964±125 μg dm−3, respectively. Microscopic analysis revealed the presence of diverse Nodularia forms, with the dominance of curved filaments in bloom samples. The results of in situ studies and remote sensing measurements indicate a high frequency and intensity of cyanobacterial blooms in the Gulf of Gdańsk in the last ten years.
12

Ekologia toksycznych sinic

45%
Blaszczyk A., Torunska A., Kobos J., Browarczyk-Matusiak G., Mazur-Marzec H.
Kosmos
|
2010
|
tom 59
|
nr 1-2
173-198
13

Cyanobacterial hepatotoxins, microcystins and nodularins, in fresh and brackish waters of the Pomeranian Province, Northern Poland

45%
Mazur-Marzec H., Spoof L., Kobos J., Plinski M., Meriluoto J.
Oceanological and Hydrobiological Studies
|
2008
|
tom 37
|
nr 4
3-21
14
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Morphological, genetic, chemical and ecophysiological characterisation of two Microcystis aeruginosa isolates from the Vistula Lagoon, Southern Baltic

45%
Mazur-Marzec H., Browarczyk-Matusiak G., Forycka K., Kobos J., Plinski M.
Oceanologia
|
2010
|
tom 52
|
nr 1
127-146
The Vistula Lagoon (southern Baltic Sea) is a shallow and highly eutrophic water body, with frequent blooms of cyanobacteria dominated by Microcystis and Anabaena species. Two Microcystis strains, MK10.10 and MAKR0205, isolated from the lagoon were characterised in this work. The morphology of the isolates differed significantly with respect to cell size and their ability to form aggregates. Based on the 16S rRNA sequence and 16S-23S internal transcribed spacer (ITS) sequence, both isolates were classified as Microcystis aeruginosa. However, only one isolate, MK10.10, possessed the mcy genes responsible for microcystin biosynthesis and only this strain produced microcystins. The effects of environmental factors, such as light, temperature and salinity, on toxin production turned out to be minor. Under the culture conditions used in the experiments, the biomass of the toxic MK10.10 was always lower. Hybrid quadrupole-time-of-flight liquid chromatography/tandem mass spectrometry (QTOF-LC/MS/MS) was used to elucidate the structure of the microcystin (MC) variants produced by MK10.10. Based on molecular ion and fragmentation spectra, the toxins were identified as MC-LR, MC-VR and MC- HIlR. Our study confirmed that some morphological criteria could be useful in preliminarily assessing the potential toxicity of a Microcystis bloom.
15

Toxic cyanobacterial blooms in the Kociewskie Lakes [Northern Poland]

45%
Kobos J., Mazur-Marzec H., Dittmer M., Witek B., Plinski M.
Oceanological and Hydrobiological Studies
|
2005
|
tom 34
|
nr Suppl.3
16

Biotechnological potentialof Baltic cyanobacteria

39%
Mazur-Marzec H., Ceglowska M., Fidor A., Goua M., Kropidlowska M., Wieczerzak E., Edwards C.
Acta Biochimica Polonica
|
2018
|
tom 65
|
nr S2
17

Mikroskopijni zabojcy

32%
Mazur-Marzec H.
Wiedza i Życie
|
2006
|
nr 02
62-65
18
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

A study of episodic events in the Baltic Sea – combined in situ and satellite observations

27%
Lysiak-Pastuszak E., Bartoszewicz M., Bradtke K., Darecki M., Drgas N., Kowalczuk P., Krasniewski W., Krezel A., Krzyminski W., Lewandowski L., Mazur-Marzec H., Piliczewski B., Sagan S., Sutryk K., Witek B.
Oceanologia
|
2012
|
tom 54
|
nr 2
A project was developed concerning the operational system of surveillance and the recording of episodic events in the Baltic Sea. In situ information was to be combined with multi-sensory satellite imagery to determine the extent of algal blooms, to track their evolution and that of rapid environmental events like hydrological fronts. The main element of the system was an autonomous Ferry Box module on a ferry operating between Gdynia and Karlskrona, automatically measuring temperature, salinity and chlorophyll a fluorescence. At pre-selected locations, discrete water samples were collected, which were subsequently analysed for their phytoplankton content, and algal hepato- and neurotoxins; they were also used in toxicity tests with Artemia franciscana.
19

Cyanobacteria and cyanotoxins in Polish freshwater bodies

24%
Kobos J., Blaszczyk A., Hohlfeld N., Torunska-Sitarz A., Krakowiak A., Hebel A., Sutryk K., Grabowska M., Toporowska M., Kokocinski M., Messyasz B., Rybak A., Napiorkowska-Krzebietke A., Nawrocka L., Pelechata A., Budzynska A., Zagajewski P., Mazur-Marzec H.
Oceanological and Hydrobiological Studies
|
2013
|
tom 42
|
nr 4
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