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001-es BibID:	BIBFORM076955
Első szerző:	Grigorszky István (biológus-ökológus)
Cím:	Drivers of the Ceratium hirundinella and Microcystis aeruginosa coexistence in a drinking water reservoir / István Grigorszky, Keve Tihamér Kiss, László József Szabó, György Dévai, Sándor Alex Nagy, Imre Somlyai, Csaba Berta, Marija Gligora-Udovič, Gábor Borics, Gabriella Pór, Yaqoob Majd Muwafaq, Arber Hajredini, Uyanga Tumurtogoo, Éva Ács
Dátum:	2019
ISSN:	0213-8409 1989-1806
Megjegyzések:	The spatial and temporal patterns of phytoplankton in relation to physical and chemical properties were studied in a drinking water reservoir - the Lázbérc Reservoir - located in north-east Hungary. The main objectives were to determine the role of the hydrologic regime in structuring algal growth and the effects of physical and chemical variables on the coexistence of a dominant species: cyanobacteria, Microcystis aeruginosa (Kützing) Kützing and an eukaryotic dinoflagellates, Ceratium hirundinella (O.F. Müller) Dujardin. The results suggest that nutrients (TP, NH4?N and NO3?N), turbidity, and the hydrologic regime play an important role in regulating the occurrence of investigated species. The rainy summer period resulting in a mixing of the water column, and the low level of nitrogen coupled with the internal release of phosphorus from the lake sediment under brief periods of anoxia promote cyanobacterial bloom. During this period, the water column was characterised by high turbidity, which created favourable conditions for developing a huge C. hirundinella biomass and the simultaneous occurrence of M. aeruginosa. This study also demonstrated - that contrary to what was previously known, deep standing waters in the temperate zone are not only dimictic (mixing twice a year during the spring and the fall), but they can also be mixed during the summer period due to continued rainfall, which equalizes the temperature in the whole water column. This can promote the occurrence of cyanobacterial and eukaryote planktonic organisms.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Microcystis aeruginosa Ceratium hirundinella phosphorus seasonal variation water management lake-poly-mixis in temperate zone
Megjelenés:	Limnetica. - 38 : 1 (2019), p. 41-53. -
További szerzők:	Kiss Keve Tihamér Szabó László József (1955-) (ökológus, hidrobiológus) Dévai György (1942-) (ökológus) Nagy Sándor Alex (1956-) (hidrobiológus) Somlyai Imre (1978-) (okleveles hidrobiológus) Berta Csaba (1991-) (hidrobiológus) Gligora-Udovič, Marija Borics Gábor (biológus) Pór Gabriella Yaqoob, Majd Muwafaq Hajredini, Arber Tumurtogoo, Uyanga Ács Éva (1970-) (biológus, ökológus)
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001-es BibID:	BIBFORM109709
035-os BibID:	(cikkazonosító)1062 (Scopus)85152373626 (WoS)000958832100001
Első szerző:	Yaqoob, Majd Muwafaq
Cím:	The Impacts of Land Use and Seasonal Effects on Phytoplankton Taxa and Physical-Chemical Variables in the Tigris River within the City of Mosul / Majd Muwafaq Yaqoob, Imre Somlyai, Csaba Berta, István Bácsi, Aws N. Al-Tayawi, Kossay K. Al-Ahmady, Ramadhan Hamza Mohammed, Omar Alalami, István Grigorszky
Dátum:	2023
ISSN:	2073-4441
Megjegyzések:	We investigated the effect of land use based on the dominant phytoplankton and physicalchemical variables in the different areas of the Tigris River, within the city of Mosul. Agricultural and urban activities have a significant impact on the water quality of the river. Regardless of physical and chemical variables, phytoplankton act as a bio-indicator of water quality due to their fast and sensitive response to changes in the environment. Our research was conducted in the Tigris River within the city of Mosul by examining the phytoplankton species and the physical-chemical variables at 16 sites during each vegetation period. Point and non-point source pollutants have affected the Tigris River within the city of Mosul, getting into the river from upstream through agricultural activities and by urban activities in the middle section of the city, respectively from both banks. Based on our results, we observed the highest phytoplankton abundance during the October sampling periods, while the lowest occurred during the July sampling period, which was associated with maximum water temperature and absence of rain. According to our study, land use (e.g., agricultural, and urban activities) greatly affected the dominant phytoplankton species and physical-chemical variables of the Tigris River. Oscillatoria sp. dominated all seasons in the agricultural region, while at the same time, we observed an increase in the number of phytoplankton species caused by the nutrient availability upstream on the river. The effects of climate have very significant and characteristic effects in this area, which basically determine the community of organisms and the water quality; the effects resulting from anthropogenic activity significantly modify this. Based on our investigation, in the part of the Tigris River connected to Mosul, we found a clear connection between the pollution caused and the effects of different land uses, through the examination of the algal community and physical-chemical variables in different periods of the year.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk biomarkers water quality phytoplankton physical-chemical variables anthropogenic activities land use LDA
Megjelenés:	Water. - 15 : 6 (2023), p.1-17. -
További szerzők:	Somlyai Imre (1978-) (okleveles hidrobiológus) Berta Csaba (1991-) (hidrobiológus) Bácsi István (1977-) (biológus) Al-Tayawi, Aws N. Al-Ahmady, Kossay K. Mohammed, Ramadhan Hamza Alalami, Omar Grigorszky István (1967-) (biológus-ökológus)
Pályázati támogatás:	TKP2021-NKTA-32 NKFIH RRF 2.3.1 21 2022 00008 NKFIH (Víztudományi és Vízbiztonsági Nemzeti Laboratórium)
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001-es BibID:	BIBFORM096138
035-os BibID:	(cikkazonosító)2339 (Scopus)85114018366 (WoS)000694519200001
Első szerző:	Yaqoob, Majd Muwafaq
Cím:	Changes in algal plankton composition and physico-chemical variables in a shallow oxbow lake / Majd Mufafaq Yaqoob, Csaba Berta, László József Szabó, György Dévai, Szilárd Szabó, Sándor Alex Nagy, István Bácsi, Alexandra Simon, János Nagy, Imre Somlyai, Éva Ács, István Grigorszky
Dátum:	2021
ISSN:	2073-4441
Megjegyzések:	In our work, we sought to answer whether we find differences among the various zones of an oxbow lake with different land uses based on physico-chemical variables and dominant algal plankton species. The two ends of the oxbow lake are bordered by settlements, and near them there are open water areas where fishing is the major utilization form. Between the two open water areas we find a protected area with a large aquatic plant coverage and two transition zones towards the open water areas. The oxbow lake receives periodic water replenishment only at one end from one of the open water areas. During summer?due to the lack of rain?the water of the oxbow lake is used for irrigation in the surrounding arable land, so the water level fluctuation can be significant in the riverbed. Our study was performed within a vegetation period of spring, early summer, mid-summer, and fall. In connection with the ecological classification of a smaller water body, studies on the physical and chemical properties of the water and the composition of the algal plankton are usually carried out in few places and relatively infrequently. The characteristics of a water body are also influenced by seasonal changes, which can be the changes in the extent of vegetation coverage, the way land is used and the possibility of water replenishment, to which the algal community usually responds with changes. Based on our study, it can be said that even in a relatively small water body, we found a large differences based on the chemical and physical properties of the water and the characteristic algal species. Open water zones, areas with large macrovegetation coverage, and the transition zones were separated from each other.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk phytoplankton physico-chemical oxbow lake macrophytes open water PCA
Megjelenés:	Water. - 13 : 17 (2021), p. 1-20. -
További szerzők:	Berta Csaba (1991-) (hidrobiológus) Szabó László József (1955-) (ökológus, hidrobiológus) Dévai György (1942-) (ökológus) Szabó Szilárd (1974-) (geográfus) Nagy Sándor Alex (1956-) (hidrobiológus) Bácsi István (1977-) (biológus) Simon Alexandra Nagy János (1951-) (agrármérnök, mérnök-tanár) Somlyai Imre (1978-) (okleveles hidrobiológus) Ács Éva (1970-) (biológus, ökológus) Grigorszky István (1967-) (biológus-ökológus)
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