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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:	BIBFORM102672
035-os BibID:	(cikkazonosító)2149 (WoS)000833329100001 (Scopus)85134040601
Első szerző:	Tumurtogoo, Uyanga
Cím:	Density and Diversity Differences of Contemporary and Subfossil Cladocera Assemblages: A Case Study in an Oxbow Lake / Uyanga Tumurtogoo, Aida Figler, János Korponai, Zsófi Sajtos, István Grigorszky, Csaba Berta, István Gyulai
Dátum:	2022
ISSN:	2073-4441
Megjegyzések:	Cladocerans are biological indicators of environmental changes. Their remains provide information on past changes in lake environments. We studied the correspondence between con- temporary Cladocera assemblages and their subfossil remains from an oxbow lake. We sought to demonstrate that there were differences among the various sites of an oxbow lake with different utilization based on contemporary and subfossil Cladocera assemblages and physical?chemical variables. The oxbow lake's two sides are used as fishing sites, where angling is the main activity. The middle site of the lake is under nature protection with high macrovegetation coverage. Contemporary and subfossil Cladocera assemblages were sampled from 21 sampling sites along the oxbow lake. Our research showed that the subfossil Cladocera assemblages had higher species richness and densi- ties (36 taxa) than the contemporary species (29 taxa). We found one species of the Polyphemidae family only in the contemporary assemblage. Among the sites, Cladocera assemblages differed in their species composition and density. The highest densities were found in the second fishing site due to the appearance of the small-sized Bosmids. The relationship between Cladocerans and the physical?chemical variables showed that some variables, such as chlorophyll-a, biological oxygen demand, dissolved oxygen, copper, phosphide, and organic matter content, significantly affected Cladocera composition. We found that the subfossil Cladocera assemblage was significantly more diverse and abundant than the contemporary one, indicating that an integrated sampling may be sufficient to provide better results on the total species composition of the water body.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk physical-chemical variables contemporary subfossil Cladocera fishing and natural site
Megjelenés:	Water. - 14 : 14 (2022), p. 1-14. -
További szerzők:	Figler Aida (1993-) (okleveles hidrobiológus) Korponai János (1964-) (biológus) Sajtos Zsófi (1994-) (kémikus) Grigorszky István (1967-) (biológus-ökológus) Berta Csaba (1991-) (hidrobiológus) Gyulai István (1980-) (biológus)
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