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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 (1988-) (PhD student) Ács Éva (1970-) (biológus, ökológus)
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001-es BibID:	BIBFORM126217
035-os BibID:	(Scopus)85211950766 (WoS)001376933900001
Első szerző:	Gyulai István (biológus)
Cím:	Comparative analysis of contemporary and subfossil Cladocera assemblages with respect to lake utilisation and environmental factors / István Gyulai, Arber Hajredini, Kinga Varga, Jázmin Jakab, Ángel Gabriel Vallejo-Cuzco, Imre Somlyai, István Grigorszky, Csaba Berta
Dátum:	2025
ISSN:	1015-1621 1420-9055
Megjegyzések:	Shallow lakes hold significant ecological importance, serving as habitats for various species and functioning as carbon sinks. In this study we investigated contemporary and subfossil Cladocera assemblages of a mixed-use (nature protection, agriculture and recreation) shallow oxbow lake. We examined the effects of utilisation on species variations and how these utilisations can affect Cladocera species. A total of 36 species were identified, from which ten were only found in the contemporary assemblage, with 35 belonging to the subfossil assemblage. The subfossil assemblage showed consistently higher species richness and abundance. The highest number of species in both assemblages was found in the protected area, which also exhibited the highest number of individuals for the contemporary assemblage. The Mantel test indicated a weak correlation between the assemblages collected. Non-metric multidimensional scaling revealed a clear separation between the agriculturally utilised section and other areas based on the composition of the contemporary assemblage. Furthermore, canonical correspondence analysis identified potential associations between specific chemical and physical variables and the observed variations in species abundances. These findings highlight the impacts of utilisation types and suggest environmental factors influence Cladocera distribution and abundance.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Cladocera assemblages Chemical and physical variables Contemporary and subfossil Utilisation effects Environmental factors
Megjelenés:	Aquatic Sciences. - 87 : 1 (2025), p. 1-14. -
További szerzők:	Hajredini, Arber Varga Kinga Jakab Jázmin Vallejo-Cuzco, Gabriel Somlyai Imre (1978-) (okleveles hidrobiológus) Grigorszky István (1967-) (biológus-ökológus) Berta Csaba (1991-) (hidrobiológus)
Pályázati támogatás:	TKP2021-NKTA-32 Egyéb RRF 2.3.1 21 2022 00008 Egyéb
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001-es BibID:	BIBFORM112165
035-os BibID:	(Scopus)85160695044 (WoS)001021959700001
Első szerző:	Hajredini, Arber
Cím:	Possible mediation of Cladocera species by a researcher's chest wader / Arber Hajredini, Florent Demelezi, Imre Somlyai, István Grigorszky, Csaba Berta
Dátum:	2023
ISSN:	2405-8440
Megjegyzések:	Mediation of aquatic species has become an increasing problem for the last few decades. With the increasing commercial import, species' direct or indirect spread can gain more space. There are several ways for them to land in their new home and spread through the country. Most of the aquatic species are spread by waterways, boats, vehicles, or even with the help of humans. Cladocerans have a good dispersal ability, thanks to their small size, additionally they possess good adaptation, and mechanisms to develop resting eggs. Benthic or littoral species can be mediated much more easily due to their living space, and with the help of human activities (e.g., scientists, anglers and people working in water bodies) they have a higher chance to colonize new habitats. Our goal was to explore if Cladocera species might be mediated by a scientist chest wader, while sampling in similar-sized, close-to-each other lakes, with different utilization. Most of the species were found in abandoned fishing lakes, followed by oxbow lakes (protected), and ultimately in intensively fished lakes. NMDS showed that samples from lakes with the same utilization are similar to each other. Differently utilized lakes can have various Cladocera species, even though they are closely related to each other. Based on the results, scientists can mediate species on their chest wader from lake to lake and may deteriorate the results. We recommend a necessary chest wader cleaning after every sampling process, especially when samples are taken from differently utilized lakes.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Cladocera Mediation Dispersal Utilization type Chest wader Cleaning
Megjelenés:	Heliyon. - 9 : 6 (2023), p. 1-10. -
További szerzők:	Demelezi Florent Somlyai Imre (1978-) (okleveles hidrobiológus) Grigorszky István (1967-) (biológus-ökológus) Berta Csaba (1991-) (hidrobiológus)
Pályázati támogatás:	TKP2021-NKTA-32 Egyéb RRF 2.3.1 21 2022 00008 NKFIH
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