Temat: cyanoprokaryota - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Large red cyanobacterial mats (Spirulina subsalsa Oersted ex Gomont) in the shallow sublittoral of the Southern Baltic
Autorzy:: Wlodarska-Kowalczuk, M.
Balazy, P.
Kobos, J.
Wiktor, J.
Zajaczkowski, M.
Moskal, W.
Powiązania:: https://bibliotekanauki.pl/articles/48400.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Cyanoprokaryota
Spirulina subsalsa
diatom
nematode
algal mat
Baltic Sea
Gdansk Gulf
coastal water
Źródło:: Oceanologia; 2014, 56, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The effects of cyanobacterial blooms on MODIS-L2 data products in the Southern Caspian Sea
Autorzy:: Naghdi, K.
Moradi, M.
Kabiri, K.
Rahimzadegan, M.
Powiązania:: https://bibliotekanauki.pl/articles/958164.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Cyanoprokaryota
algal bloom
chlorophyll a
fluorescence
wind stress
sea surface
satellite image
Caspian Sea
Źródło:: Oceanologia; 2018, 60, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Is iron a limiting factor of Nodularia spumigena blooms?
Autorzy:: Paczuska, L.
Kosakowska, A.
Powiązania:: https://bibliotekanauki.pl/articles/48305.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: pigment
Cyanoprokaryota
trace element
alga
chlorophyll a
Nodularia spumigena
bloom
Baltic Sea
growth
Opis:: It is well known that a deficiency of iron, a trace element essential to every living organism, limits the growth of algae and cyanobacteria. Nodularia spumigena Mertens is a blue-green algae species inhabiting the Baltic region that often forms toxic blooms. The aim of the study was to assess the growth of the toxic cyanobacteria with respect to iron bioavailability. The measured growth parameters were the numbers of cells (optical density), chlorophyll a and pheopigment a concentrations. The iron concentrations used ranged from 10−7 to 10−4 mol dm−3. Under iron stress conditions (< 5 × 10−7 mol dm−3), growth inhibition, gradual pigment decay and cell mortality were observed. However, enriching the medium with complexing factors like citric acid and EDTA significantly stimulated the growth rate and chlorophyll a production. The citric acid – EDTA – Fe (5 × 10−7 mol dm−3) complex was demonstrably effective in stimulating the rate of cell division. Starting with 10−6 mol dm−3, the higher the iron(III) concentration used in the media, the more intensive the growth of the cyanobacteria populations. This was most rapid in the presence of high iron concentrations (10−4 mol dm−3), regardless of the presence of complexing agents. It appears that the growth of toxic cyanobacteria N. spumigena, and thus also its ability to form blooms, may well depend on iron availability in the environment.
Źródło:: Oceanologia; 2003, 45, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stability of cyanotoxins, microcystin-LR, microcystin-RR and nodularin in seawater and BG-11 medium of different salinity
Autorzy:: Mazur, H.
Plinski, M.
Powiązania:: https://bibliotekanauki.pl/articles/48388.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: cyanotoxin
microcystin-LR
biodegradation
microcystin-RR
Gdansk Gulf
Cyanoprokaryota
hepatotoxin
sea water
nodularin
Opis:: Microcystins and nodularin are potent hepatotoxins produced by fresh and seawater cyanobacteria.T he persistence of three hepatotoxins – microcystin-LR, microcystin-RR and nodularin – was investigated in sterile BG-11 medium of different salinity and in water collected from the Gulf of Gdańsk.After 21 days of incubation at 17±1◦ C and constant illumination of about 40 μmol photon m−2 s−1 the concentration of toxins decreased by about 30–37%.N o significant changes in toxin concentration in the BG-11 media of different salinity were observed. When toxins were incubated in non-sterile seawater, their concentrations decreased markedly.It is likely that some strains of bacteria are responsible for the breakdown of the toxins.No dularin turned out to be more resistant to biodegradation than the two microcystins.The influence of certain components of cyanobacteria cells on the accelerated rate of toxin degradation was also considered.
Źródło:: Oceanologia; 2001, 43, 3; 329-339
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Ecological indices as a tool for assessing pollution in El-Dekhaila Harbour (Alexandria, Egypt)
Autorzy:: Ismael, A.A.
Dorgham, M.M.
Powiązania:: https://bibliotekanauki.pl/articles/48906.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: biomass
euglenophyte
Cyanoprokaryota
temperature
pollution
Alexandria
chlorophyte
El-Dekhaila Harbour
salinity
phytoplankton
Egypt
Opis:: Statistical analyses of data concerning the phytoplankton standing crop and biomass were applied as a tool for assessing pollution in El-Dekhaila Harbour. Univariate and multivariate analysis showed a succession of three clusters associated with salinity and temperature variations. The first and third clusters comprised mainly diatoms and dinoflagellates. The second cluster, richer in species, was dominated by brackish water cyanophytes, chlorophytes and euglenophytes. The diversity index ranged from 0.08 to 2.41. A high diversity was associated with high evenness, reflecting the multidominance pattern of cluster (2). On the other hand, multiple correlations between salinity and standing crop, richness and evenness, were negative and significant, but positive with the diversity index. The ABC curve showed that the k-dominance curve for numerical abundance extends above that for the biomass when clusters 1an d 3 are dominant. Both curves coincide more or less for another segment of the curve but when cluster 2 becomes dominant the numerical abundance curve runs below that of the biomass. Such a pattern may indicate unpolluted or moderate to heavily polluted conditions in El-Dekhaila Harbour. The present study reveals that the combination of univariate and multivariate analysis with the ABC curve provides a promising tool for the characterization of phytoplankton dynamics under stress conditions. On the other hand, the phytoplankton community in El-Dekhaila Harbour is stressed not by the inflow of brackish water but rather by the inflow of sea water. This is indicated by the higher diversity and evenness, and by the ABC curve during the dominance of cluster (2).
Źródło:: Oceanologia; 2003, 45, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effects of oxytetracycline on growth and chlorophyll a fluorescence in green algae (Chlorella vulgaris), diatom (Phaeodactylum tricornutum) and cyanobacteria (Microcystis aeruginosa and Nodularia spumigena)
Autorzy:: Siedlewicz, G.
Zak, A.
Sharma, L.
Kosakowska, A.
Pazdro, K.
Powiązania:: https://bibliotekanauki.pl/articles/2079298.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: oxytetracycline
microalga
chlorophyll a
fluorescence
green alga
Chlorella vulgaris
diatom
Phaeodactylum tricornutum
Cyanoprokaryota
Microcystis aeruginosa
Opis:: The study aimed at measuring the influence of a wide range of oxytetracycline concentrations, with particular attention to the low levels of the antibiotic on cyanobacteria Microcystis aeruginosa and Nodularia spumigena, diatom Phaeodactylum tricornutum and the model green algae Chlorella vulgaris by conducting prolonged toxicity tests (lasting 10 days). Standard measurements (cell number, optical density, chlorophyll a concentration) were combined with photosynthetic parameters measurements. The obtained results show that concentrations of oxytetracycline present in the environment can affect tested microorganisms. It was found to decrease photosystem II efficiency and disrupt the photosynthesis process. A careful interpretation of photosynthetic parameters allowed a better understanding of the mode of action of oxytetracycline in relation to non-target photoautotrophic organisms like cyanobacteria and microalgae. In conclusion, it would appear that the use of standard chronic toxicity tests (72 h) does not allow to accurately and reliably assess the chronic impact of bioactive compounds including drugs and their metabolites on water organisms. On this basis, we recommend the application of extended duration tests.
Źródło:: Oceanologia; 2020, 62, 2; 214-225
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Toxic effect of cyanobacterial blooms on the grazing activity of Daphnia magna Straus
Autorzy:: Lotocka, M.
Powiązania:: https://bibliotekanauki.pl/articles/48398.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Daphnia magna
Cyanoprokaryota
Aphanizomenon flos-aquae
herbivorous organism
bloom
grazing activity
toxic effect
Microcystis aeruginosa
Opis:: The investigations aimed to determine the impact of cyanobacteria Microcystis aeruginosa (K¨utz.) K¨utz. and Aphanizomenon flos-aquae (L.) Ralfs ex Bornet et Flah., both toxic algae, on the grazing intensity of Daphnia magna Straus. In order to determine the parameter permitting the quantitative determination of the grazing intensity of herbivorous organisms, methods based on the following techniques were applied: microscopy, to determine the degree of gut fullness; spectrophotometry, to determine the levels of chlorophyll a and its degradation products in the food composition; high-performance liquid chromatography (HPLC) to determine the content of exogenous and endogenous carotenoids. Each of these methods confirmed that the tested algae species inhibited grazing intensity in D. magna Straus. The most obvious effects were obtained when M. aeruginosa (K¨utz.) K¨utz. was used as food. With these cyanobacteria, the gut fullness indicator did not exceed 58%, and the chlorophyll a content in the digestive system of the tested D. magna was three times lower than that in the control organisms. It seems that the defensive reaction of organisms was a reversible process. However, the possibility of a long-term, sublethal influence of cyanobacteria on the physiology and internal processes of this species cannot be ruled out.
Źródło:: Oceanologia; 2001, 43, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Canthaxanthin in recent sediments as an indicator of heterocystous cyanobacteria in coastal waters
Autorzy:: Krajewska, M.
Szymczak-Zyla, M.
Kobos, J.
Witak, M.
Kowalewska, G.
Powiązania:: https://bibliotekanauki.pl/articles/47440.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Cyanoprokaryota
chlorophyll a
coastal water
carotenoid
chloropigment
canthaxanthin
Gdansk Gulf
Baltic Sea
recent sediment
Źródło:: Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Toxic cyanobacteria blooms in the Lithuanian part of the Curonian Lagoon
Autorzy:: Paldaviciene, A.
Mazur-Marzec, H.
Razinkovas, A.
Powiązania:: https://bibliotekanauki.pl/articles/48516.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Baltic Sea
blue-green alga
Curonian Lagoon
Microcystis aeruginosa
Nodularia spumigena
Cyanoprokaryota
bloom
microcystin
Lithuania
nodularin
Opis:: 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).
Źródło:: Oceanologia; 2009, 51, 2; 203-216
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Toxic Nodularia spumigena blooms in the coastal waters of the Gulf of Gdańsk: a ten-year survey
Autorzy:: Mazur-Marzec, H.
Krezel, A.
Kobos, J.
Plinski, M.
Powiązania:: https://bibliotekanauki.pl/articles/48080.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: Cyanoprokaryota
remote sensing
coastal water
nodularin
hepatotoxin
Nodularia spumigena
water quality
bloom
aquatic ecosystem
Gdansk Gulf
Opis:: 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.
Źródło:: Oceanologia; 2006, 48, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Bioactive metabolites produced by Spirulina subsalsa from the Baltic Sea
Autorzy:: Szubert, K.
Wiglusz, M.
Mazur-Marzec, H.
Powiązania:: https://bibliotekanauki.pl/articles/47501.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: bioactive metabolite
Spirulina subsalsa
Baltic Sea
Cyanoprokaryota
bioremediation
cytotoxic activity
liquid chromatography-tandem mass spectrometry
protease inhibitor
Źródło:: Oceanologia; 2018, 60, 3
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: A simple tool for the early prediction of the cyanobacteria Nodularia spumigena bloom biomass in the Gulf of Finland
Autorzy:: Lilover, M.J.
Laanemets, J.
Powiązania:: https://bibliotekanauki.pl/articles/47999.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: biomass
logic model
Cyanoprokaryota
Sopot
Nodularia spumigena
toxicity
bloom
conference
Baltic Sea
algal bloom
Finland Gulf fuzzy
Opis:: A fuzzy logic model for predicting the maximum biomass of the toxic cyanobacteria Nodularia spumigena bloom in the Gulf of Finland is suggested. The model bloom biomass depends on the phosphate conditions up to 15 June, including the excess phosphate left over after the spring bloom and on the phosphate inputs parameterised by wind mixing and upwelling from 1 May to 15 June. The surface layer temperature, set to vary from 14 to 23◦C, is regarded as a bloom regulating parameter. The model simulations showed that the predicted N. spumigena biomasses differ markedly from year to year and clearly depend on phosphate conditions up to 15 June.
Źródło:: Oceanologia; 2006, 48, S
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Laboratory measurements of remote sensing reflectance of selected phytoplankton species from the Baltic Sea
Autorzy:: Soja-Wozniak, M.
Darecki, M.
Wojtasiewicz, B.
Bradtke, K.
Powiązania:: https://bibliotekanauki.pl/articles/47866.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: remote sensing
reflectance
phytoplankton
diatom
Cyclotella meneghiniana
Skeletonema marinoi
Cyanoprokaryota
Dolichospermum
Nodularia spumigena
Synechococcus
Baltic Sea
Opis:: Results of unique laboratory measurements of remote sensing reflectance (Rrs) of several phytoplankton species typically occurring in high abundances in the Baltic Sea waters are presented. Reflectance spectra for diatoms: Cyclotella meneghiniana and Skeletonema marinoi and Dolichospermum sp., Nodularia spumigena and sp. were analysed in terms of assessment of their characteristic features and the differences between them. These species contain similar pigments, which results in general similarities of reflectance spectra, i.e. decrease of reflectance magnitude in the blue and red spectrum regions. However, hyper-spectral resolution of optical measurements let us find differences between optical signatures of diatoms and cyanobacteria groups and between species belonging to one group as well. These differences are reflected in location of local maxima and minima in the reflectance spectrum and changes in relative height of characteristic peaks with changes of phytoplankton concentration. Wide ranges of phytoplankton concentrations were analysed in order to show the persistence of Rrs characteristic features. The picoplankton species, Synechococcus sp. show the most distinct optical signature, which let to distinguish separate cluster in hierarchical cluster analysis (HCA). The results can be used to calibrate input data into radiative transfer model, e.g. phase function or to validate modelled Rrs spectra.
Źródło:: Oceanologia; 2018, 60, 1
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Nodularia spumigena blooms and the occurrence of hepatotoxin in the Gulf of Gdańsk
Autorzy:: Mazur, H.
Plinski, M.
Powiązania:: https://bibliotekanauki.pl/articles/48762.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: nutrient concentration
Cyanoprokaryota
water temperature
nitrogen
Nodularia spumigena
hepatotoxin
Baltic Sea
occurrence
bloom
Gdansk Gulf
phosphorus
toxin
light intensity
Opis:: Nodularia spumigena forms extensive summer blooms in the Baltic Sea. The occurrence of the blooms is determined by water temperature, light intensity and nutrient concentration; levels of nitrogen and phosphorus in particular are critical. The time of the seasonal maximum and intensity of the Nodularia bloom in the Gulf of Gdańsk vary significantly from year to year. In 2001 a rapid and massive proliferation of N. spumigena was observed in late June – early July. The concentration of nodularin in water ranged from 90 to 18 135 μg dm−3 and in lyophilised phytoplankton samples from 3000 to 3520 μg g−1 d.w. (dry weight). Such a high concentration of toxin in the recreational waters of the Gulf of Gdańsk constitutes a health risk for users of bathing areas. In 2002, the N. spumigena bloom was less dense, but lasted longer, with a maximum in late July – early August. In 2002 the concentration of nodularin did not exceed 12.6 μg dm−3 in water and 919 μg g−1 d.w. in lyophilised phytoplankton samples. Other cyanobacterial toxins – microcystins and anatoxin-a – were also detected in the coastal waters of the Gulf of Gdańsk.
Źródło:: Oceanologia; 2003, 45, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki