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1.

001-es BibID:BIBFORM083449
Első szerző:Berta Csaba (hidrobiológus)
Cím:Examination of heterogeneity by Cladocera community along an oxbow lake in Central Tisza region. / Berta Csaba, Korponai János, Grigorszky István, Nagy Sándor Alex, Simon Edina, Somlyai Imre, Gyulai István
Dátum:2018
Tárgyszavak:Természettudományok Biológiai tudományok nem besorolt
egyéb
Cladocera
Megjelenés:15th Subfossil Cladocera Workshop : Abstract book. - p. 1-11.
További szerzők:Korponai János (1964-) (biológus) Grigorszky István (1967-) (biológus-ökológus) Nagy Sándor Alex (1956-) (hidrobiológus) Simon Edina (1981-) (ökológus) Somlyai Imre (1978-) (okleveles hidrobiológus) Gyulai István (1980-) (biológus)
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2.

001-es BibID:BIBFORM075110
Első szerző:Berta Csaba (hidrobiológus)
Cím:Cladocerans as indicators in the importance of passive nature conservation / Csaba Berta, István Gyulai, József László Szabó, Edina Simon, Alex Sándor Nagy, Imre Somlyai, István Grigorszky
Dátum:2018
ISSN:0006-3088 1336-9563
Megjegyzések:The aim of our study was to verify the effectiveness of passive nature conservation with regard to the preservation of species, by examining a typical mesozooplankton community. We investigated five oxbow lakes which were similar to each other in terms of size, depth and close-to-each, but which differed markedly from one to another in terms of lake management. One is under passive protection, the others are under different forms of management. Based on the NMDS (Non-metric Dimensional Scaling) analysis, we identified the variable (transparency) which is responsible for the segregation. In the case of rare species IndVal (Indicator Value) analysis was used to evaluate the occurrence and significance of indicator species. We also found marked differences in the species composition; seven species showed indicator values for the protected oxbow lake, five of which were significant (p <?0.001). In contrast, in the case of the other four oxbow lakes, a total of one species showed an indicator value. Finally, regression tree analysis was used to distinguish the oxbow lakes from each other for both common and mass-occurring species. Among the mass-occurring species, the protected oxbow lake is characterized by a large number of Acropreus harpae (Baird, 1835), while in case of the other, non-protected, oxbow lakes Alona guttata (Sars, 1862) and Alonella excisa (Fischer, 1854) are the basis for the separate classification. There is a positive effect of passive protection regarding the quantitative and qualitative occurrence of the zooplankton community. Our study highlights the importance of this kind of passive protection in the life of a particular water body and advocates that their protection should be maintained.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Biologia. - 73 : 9 (2018), p. 875-884. -
További szerzők:Gyulai István (1980-) (biológus) Szabó József László Simon Edina (1981-) (ökológus) Nagy Sándor Alex (1956-) (hidrobiológus) Somlyai Imre (1978-) (okleveles hidrobiológus) Grigorszky István (1967-) (biológus-ökológus)
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3.

001-es BibID:BIBFORM097906
Első szerző:Dévai György (ökológus)
Cím:Long-term analysis of River Tisza water level data with regard to the ecological water demand of floodplain water bodies / Dévai György, Gyöngy Martina, Berta Csaba, Bogár Ferenc, Bogár Imre, Varga György, Zoltán Lucza, Szabó László József, Somlyai Imre, Nagy Sándor Alex, Grigorszky István
Dátum:2021
ISSN:1789-4921 1789-7556
Megjegyzések:One of the main threats of our time is the increasing water demand not only globally, but also locally. These are often met at the expense of ecological water demand, jeopardizing the structural and operational conditions necessary to maintain good ecological status in aquatic and wetland habitats. This is why it is of great importance to explore possible water retention options. In 2019, based on the long-term data series on the water level of River Tisza, we studied the frequency and extent of flooding in the floodplain between Tiszabercel and Gávavencsellő, where there are valuable wetlands, including a ♭sanctuary'-type backwater. This was necessary because recently the floodplains have undergone negative changes. Their water volume has gradually decreased, their valuable wildlife has become rarer, some of them have completely dried out in the autumn and even one of them has burned out. From the analysis of the examined 48-years data, it could be concluded that flooding was relatively frequent in the sampled area, but the extent of water coverage had no significant effect either in space or time. It was also found that only water levels above 700 cm (based on the water meter of Tiszabercel, 98.36 mBf) could adequately ensure that the water bodies are filled up and flushed out. However, there is little chance of this, because of four reasons: (1) water levels of this height are becoming rare; (2) the duration and height of high water levels are mostly short in time; (3) water levels of several water bodies are artificially decreased; (4) the drainage effect of the River Tisza ? which has been significantly incised after the river regulation ? prevails in the area. Due to all, in the future, there would be a great need to maintain the water levels in the floodplain wetlands as efficiently as possible after the floods ? for which we have made specific proposals for the places and methods to preserve the ecologically necessary amount of water.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
water demand
ecological status
River Tisza
floodplain
wetlands
degradation
flood
water level
fluctuation
water retention
Megjelenés:Acta geographica Debrecina. Landscape & environment series. - 15 : 1 (2021), p. 16-32. -
További szerzők:Gyöngy Martina Berta Csaba (1991-) (hidrobiológus) Bogár Ferenc Bogár Imre Varga György Zoltán Lucza Szabó László József (1955-) (ökológus, hidrobiológus) Somlyai Imre (1978-) (okleveles hidrobiológus) Nagy Sándor Alex (1956-) (hidrobiológus) Grigorszky István (1967-) (biológus-ökológus)
Pályázati támogatás:KEHOP-1.1.0-15-2016-00008
Egyéb
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4.

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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5.

001-es BibID:BIBFORM074265
Első szerző:Grigorszky István (biológus-ökológus)
Cím:Temperature and growth strategies as the essential factors influencing the occurrence of Stephanodiscus minutulus (Kützing) Cleve & Möller and Palatinus apiculatus (Ehrenberg) Craveiro, Calado, Daugbjerg & Moestrup / Grigorszky István, Kiss Tihamér Keve, Pór Gabriella, Dévai György, Nagy Sándor Alex, Somlyai Imre, Berta Csaba, Duleba Mónika, Trábert Zsuzsa, Ács Éva
Dátum:2017
ISSN:1863-9135
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Fundamental and Applied Limnology. - 189 : 2 (2017), p. 167-175. -
További szerzők:Kiss Tihamér Keve Pór Gabriella Dévai György (1942-) (ökológus) Nagy Sándor Alex (1956-) (hidrobiológus) Somlyai Imre (1978-) (okleveles hidrobiológus) Berta Csaba (1991-) (hidrobiológus) Duleba Mónika Trábert Zsuzsa Ács Éva (1970-) (biológus, ökológus)
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6.

001-es BibID:BIBFORM080980
035-os BibID:(cikkazonosító)2002 (WoS)000495598400047 (Scopus)85073198500
Első szerző:Somlyai Imre (okleveles hidrobiológus)
Cím:Heterogeneity and Anthropogenic Impacts on a Small Lowland Stream / Imre Somlyai, Csaba Berta, Sándor Alex Nagy, György Dévai, Éva Ács, László József Szabó, János Nagy, István Grigorszky
Dátum:2019
ISSN:2073-4441
Megjegyzések:During our work, we investigated the physical and chemical variables of a small surface watercourse to investigate how different anthropogenic effects affect its water quality. Along this small watercourse, there are well-separated areas that are affected by various anthropogenic effects. In addition to its origin and branches, in many places it is surrounded by agricultural land with insufficient buffer zones, which burdens the small watercourse with nitrogen and phosphorus forms. In the lower stages, artificial damming inhibits the natural flow of the Tócó Canal, thereby creating eutrophicated stagnant water areas. This is further strengthened by, in many cases, illegal communal and used water intake that further burdens the small watercourse. Considering the experience of our investigation, it can be stated that the examined small watercourse could barely suffer human impacts, and it could be described with great heterogeneity using physical and chemical variables. We experienced that this heterogeneity caused by anthropogenic effects appeared in all hydrologic states and seasons. Furthermore, our research showed that these small watercourses had such high heterogeneity that their monitoring and examination should be taken just as seriously as when it comes to larger watercourses.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
urban water
anthropogenic impacts
land use
small lowland stream
physical-chemical variables
EU Water Framework Directive
Megjelenés:Water. - 11 : 10 (2019), p. 1-14. -
További szerzők:Berta Csaba (1991-) (hidrobiológus) Nagy Sándor Alex (1956-) (hidrobiológus) Dévai György (1942-) (ökológus) Ács Éva (1970-) (biológus, ökológus) Szabó László József (1955-) (ökológus, hidrobiológus) Nagy János (1951-) (agrármérnök, mérnök-tanár) Grigorszky István (1967-) (biológus-ökológus)
Pályázati támogatás:20428-3/2018/FEKUTSTRAT
egyéb
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7.

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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