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001-es BibID:	BIBFORM078569
035-os BibID:	(cikkazonosító)929 (Wos)000472680400059 (Scopus)85066328449
Első szerző:	Berta Csaba (hidrobiológus)
Cím:	Community Response of Cladocera to Trophic Stress by Biomanipulation in a Shallow Oxbow Lake / Csaba Berta, Béla Tóthmérész, Marta Wojewódka, Olga Augustyniuk, János Korponai, Boglárka Bertalan-Balázs, Alex Sándor Nagy, István Grigorszky, István Gyulai
Dátum:	2019
ISSN:	2073-4441
Megjegyzések:	Studying contemporary and subfossil Cladocera (Crustacea) communities, we explored the effect of top-down stressors on the cladoceran communities; we are also interested in the coherence of the contemporary and subfossil communities. The studied Cibakháza oxbow lake is in E Hungary, on the left-floodplain of the River Tisza; it is a large, long, and shallow oxbow lake. Three areas of the oxbow lake were distinguished based on the strength of top-down stress: protected area with low top-down stress, biomanipulated area with high top-down stress, and recreational area with moderate top-down stress. Altogether, we identified 28 taxa in the contemporary and subfossil communities in the oxbow lake. We found that the species number of the contemporary Cladocera communities was lower (protected area: 13; biomanipulated area: 9, and recreational area: 14) than in the subfossil communities (protected area: 20; biomanipulated area: 16, and recreational area: 14). Among the environmental variables, we observed differences between the protected and biomanipulated area, while the recreational area showed a transition. Species number, abundances, and Simpson diversity also showed the effect of the fish introduction. There were no differences in beta-diversity among the contemporary and subfossil Cladocera community. The non-metric multidimensional scaling (NMDS) ordination showed that the biomanipulated area in the case of the contemporary communities was separated from the other areas, while in the case of the subfossil communities, there was no separation according to top-down stress. Our results showed that the number of species of contemporary Cladocera communities was lower in each area (3-10; 3-9; 5-9) compared to the subfossil communities (6-17; 7-12; 8-12). However, the highest abundances were found in the biomanipulated area due to the appearance of small-sized Cladocera species. Our findings suggest that the effect of a short-time fish introduction is restorable when the oxbow lake has a protected part.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk zooplankton diversity biomanipulation nature protection anthropogenic impacts restoration
Megjelenés:	Water. - 11 : 5 (2019), p. 929-942. -
További szerzők:	Tóthmérész Béla (1960-) (ökológus) Wojewódka, Marta Augustyniuk, Olga Korponai János (1964-) (biológus) Balázs Boglárka (1985-) (geográfus) Nagy Sándor Alex (1956-) (hidrobiológus) Grigorszky István (1967-) (biológus-ökológus) Gyulai István (1980-) (biológus)
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001-es BibID:	BIBFORM123102
Első szerző:	Ojani, Mohammad Reza PHD student
Cím:	The role of land use on phosphorus release and longitudinal changes of pollution in an agricultural watershed, Bostankar river, Iran / Mohammad Reza Ojani, Mehdi Ghajar Sepanlou, MohammadAli Bahmanyar, Majid Danesh, Boglárka Bertalan-Balázs, Szilárd Szabó
Dátum:	2024
ISSN:	2363-5037 2363-5045
Megjegyzések:	Phosphorus in surface waters accelerate algal growth and eutrophication, considerably influencing water quality. Spatiotemporal changes in phosphorus concentration are crucial for environmental issues. We aimed to study the temporal and spatial changes in water quality in a river and in a drainage water system considering different land uses. To this aim, 15 water samples were collected from the origin of the river to the estuary, in the Bostankar River watershed (N-Iran), during spring and winter. Further samples were collected from agricultural drainage water in rice fields, tea, flower, orange as well as kiwi gardens, and forests during spring and winter. EC, pH, TDS, and three forms of phosphorus (total, particulate, and soluble) were measured in the water samples. The results showed that water quality changes in agricultural drainage water were time-dependent; the average total phosphorus was 0.4 mg l-1 lower in the spring than in the winter. The highest phosphorus concentration (1.29 mg l-1) occurred in the winter in the drainage water of the orange gardens. Temporal and spatial changes of the river showed that water quality reduced from the river upstream (jungles and grasslands) towards the downstream (different agricultural land uses), and the amount of phosphorus increased from 0.25 to 0.5 mg l??1. The TDS increased from 60 to 220 mg l??1 in the river in the winter. Finally, the results showed that human activities were the main factor in river water quality reduction due to agricultural activities.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Dissolved solids Eutrophication Soluble phosphorus Water quality
Megjelenés:	Sustainable Water Resources Management. - 10 : 4 (2024), p. 1-12. -
További szerzők:	Sepanlou, Mehdi Ghajar Bahmanyar, Mohammad Ali Danesh, Majid Balázs Boglárka (1985-) (geográfus) Szabó Szilárd (1974-) (geográfus)
Pályázati támogatás:	TKP2021-NKTA-32 Egyéb RRF 2.3.1 21 2022 00008 Egyéb
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