Találati lista | Tudóstér

001-es BibID:	BIBFORM084693
Első szerző:	Deák Balázs (biológus)
Cím:	Solonetz meadow vegetation (Beckmannion eruciformis) in East-Hungary : an alliance driven by moisture and salinity / Deák Balázs, Valkó Orsolya, Török Péter, Tóthmérész Béla
Dátum:	2014
ISSN:	0722-494X
Megjegyzések:	Wet meadows are transitional habitats between wetlands and dry-mesophilous grasslands; thus, they are vital in sustaining biodiversity as sources, stepping stones and green corridors of species dispersal. It is especially valid for inland alkali vegetation, where high landscape-scale patchiness is typical and rapid shifts between vegetation types occur frequently. Solonetz meadows (Beckmannion eruciformis) are among the best-preserved open habitats in Europe harbouring a unique flora including several endemics. Besides their importance, studies on the vegetation of solonetz meadows are scarce even though this knowledge would be vital for their effective conservation and management. Using own records and literature data, we provide a synthesis of the alliance Beckmannion eruciformis to characterise its associations floristically and ecologically in five regions along the river Tisza, East Hungary. We studied three associations of the alliance: (i) Agrostio stoloniferae-Alopecuretum pratensis, (ii) Agrostio stoloniferae-Beckmannietum eruciformis and (iii) Agrostio stoloniferae-Glycerietum pedicellatae. We found that solonetz meadow associations were separated along a moisture gradient with Agrostio stoloniferae-Alopecuretum pratensis at the drier end and Agrostio stoloniferae-Glycerietum pedicellateae at the wet end. This gradient was also justified by the distribution of the phytosociological groups. The proportion of species of Festuco-Brometea division was the highest in Agrostio stoloniferae-Alopecuretum pratensis, while the proportion of Cypero-Phragmitetea species was the highest in Agrostio stoloniferae-Glycerietum pedicellateae. Species of Puccinellio-Salicornetea had the highest proportion in Agrostio stoloniferae-Beckmannietum eruciformis, indicating the high soil salinity of this association. Our results suggest that Agrostio stoloniferae-Alopecuretum pratensis association plays an important role in preserving the continental flora elements of the surrounding dry grasslands. The ecological indicator values for soil moisture and salinity suggest that in case of the studied solonetz meadow associations, humidity increases with decreasing elevation, while salinity is highest at medium elevations. Our results suggest that Agrostio stoloniferae-Beckmannietum eruciformis is a transition towards salt marsh associations, while Agrostio stoloniferae-Glycerietum pedicellatae is a transition towards freshwater marshes. Our results show that preserving solonetz meadows is an important task for nature conservation as they have a crucial role in maintaining landscape-scale species and habitat diversity and act as buffer zones around wetlands.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk alkali grasslands Festuco-Puccinellietea hay-meadows landscape-scale diversity moisture gradient salinity gradient
Megjelenés:	Tuexenia. - 34 (2014), p. 187-203. -
További szerzők:	Valkó Orsolya (1985-) (biológus) Török Péter (1979-) (biológus-ökológus) Tóthmérész Béla (1960-) (ökológus)
Pályázati támogatás:	TÁMOP 4.2.1./B-09/1/KONV-2010-0007 TÁMOP TÁMOP4.2.2_B-10_1-2010-0024 TÁMOP TÁMOP-4.2.2/C-11/1/KONV-2012-0010 TÁMOP TÁMOP- 4.2.4.A/2-11-1- 2012-0001 TÁMOP PD 100 192 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM079599
Első szerző:	Godó Laura (biológus, ökológus)
Cím:	Scale-dependent effects of grazing on the species richness of alkaline and sand grasslands / Godó Laura, Valkó Orsolya, Tóthmérész Béla, Török Péter, Kelemen András, Deák Balázs
Dátum:	2017
ISSN:	0722-494X
Megjegyzések:	Extensively managed pastures harbour rare and endangered species and have a decisive role in maintaining grassland biodiversity. Traditional herding of local robust cattle breeds is considered as a feasible tool for preserving these habitats. We studied the scale-dependent effects of grazing on the species richness and composition of three dry grassland types in the Great Hungarian Plain: Achilleo setaceae-Festucetum pseudovinae and Artemisio santonici-Festucetum pseudovinae alkaline grasslands, and Potentillo arenariae-Festucetum pseudovinae sand grassland. We asked the following questions: (1) Does extensive grazing have a scale-dependent effect on plant species richness of alkaline and sand grasslands? (2) How does grazing affect the proportion of specialists, generalists and weeds in the three grassland types? We sampled ten sites of each grassland type, including five extensively grazed and five non-grazed sites (altogether we had 30 sites). We used a series of nested plots each consisting of 10 plots from the size of 0.01 m? to 16 m?. We revealed that grazing has contrasting effects in the three grassland types, and had a considerable effect on their species richness even at small scales. In both alkaline grassland types, total species richness was overall higher in grazed plots but it increased in a similar manner for both ungrazed and grazed habitats across plot sizes. Small-scale heterogeneity likely due to the uneven distribution of grazing, trampling and defecation together with mitigated rate of competition allowed more species to co-exist even at small scales in grazed alkaline grasslands. Grazing increased the richness of specialists, but likely due to the salt stress, establishment of weeds was hampered. Open gaps formed by trampling likely supported the establishment of several specialist species such as Plantago tenuiflora and Puccinellia limosa which are typical to open alkali grasslands. Contrary, in sand grasslands, we did not detect any effect of grazing on total species richness, likely due to the adverse effect of grazing on the species richness of specialists and weeds. In contrast with the former findings we detected significantly higher species richness in 0.01 m? and 0.0625 m? plots in the grazed sand grasslands, but found no differences at larger scales. Whilst species richness of specialists was significantly decreased, richness of weeds was increased by grazing. Decrease in the specialist species richness was likely due to the lack of their evolutionary adaptation to grazing. Degradation caused by grazing and trampling together with the propagule pressure from the neighbouring anthropogenic habitats resulted in an increased richness of weeds in the grazed sites.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk grassland management grassland specialist species pasture plot size scale spatial heterogeneity
Megjelenés:	Tuexenia. - 37 (2017), p. 229-246. -
További szerzők:	Valkó Orsolya (1985-) (biológus) Tóthmérész Béla (1960-) (ökológus) Török Péter (1979-) (biológus-ökológus) Kelemen András (1986-) (biológus-ökológus) Deák Balázs (1978-) (biológus)
Pályázati támogatás:	PD 115627 OTKA OTKA-111807 OTKA OTKA-116639 OTKA NKFIH K 119225 Egyéb NTP-NFTÖ-16-0068 Egyéb NTP-NFTÖ-16-0107 Egyéb
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM082240
Első szerző:	Lukács Balázs András (ökológus)
Cím:	Rainfall fluctuations and vegetation patterns in alkali grasslands - using self-organizing maps to visualise vegetation dynamics / Lukács Balázs András, Török Péter, Kelemen András, Várbíró Gábor, Radócz Szilvia, Miglécz Tamás, Tóthmérész Béla, Valkó Orsolya
Dátum:	2015
ISSN:	0722-494X
Megjegyzések:	Knowledge about the drivers of vegetation dynamics in grasslands is fundamental to select appropriate management for conservation purposes. In this study, we provide a detailed analysis of vegetation dynamics in alkali grasslands, a priority habitat of the Natura 2000 network. We studied vegetation dynamics in five stands of four alkali grassland types in the Hortobágy National Park (eastern Hungary), between 2009 and 2011. We analysed the effect of fluctuations in precipitation on both the overall vegetation composition and on the cover of each species using Self Organizing Map neural networks (SOM). We found that SOM is a promising tool to reveal plant community dynamics. As we analysed species cover and overall vegetation composition separately, we were able to identify the species responsible for particular vegetation changes. Fluctuations in precipitation (a dry season, followed by a wet and an average season) caused quick shifts in plant species composition because of an increasing cover of halophyte forbs, probably because of salinisation. We observed a similar effect of stress from waterlogging in all studied grassland types. The species composition of Puccinellia grasslands was the most stable over the three years with varying precipitation. This was important as this grassland type contained many threatened halophyte species. Self-organising maps revealed small-scale vegetation changes and provided a detailed visualisation of short-term vegetation dynamics, thus we suggest that the application of this method is also promising to reveal community dynamics in more species-rich habitat types or landscapes.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk halophytes neural network precipitation changes salt stress SOM water stress
Megjelenés:	Tuexenia. - 35 (2015), p. 381-397. -
További szerzők:	Török Péter (1979-) (biológus-ökológus) Kelemen András (1986-) (biológus-ökológus) Várbíró Gábor (biológus) Radócz Szilvia (1988-) (biológus) Miglécz Tamás (1986-) (biológus ökológus) Tóthmérész Béla (1960-) (ökológus) Valkó Orsolya (1985-) (biológus)
Pályázati támogatás:	SROP-4.2.2.B-15/1/KONV20150001 Egyéb TÁMOP- 4.2.4.A/2-11-1-2012-0001 TÁMOP TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP TÁMOP-4.2.1/B-09/1/KONV-2010-0007 TÁMOP OTKA-100192 OTKA OTKA-104279 OTKA OTKA-111807 OTKA
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat DOI
Borító:
Saját polcon:

001-es BibID:	BIBFORM065363
Első szerző:	Valkó Orsolya (biológus)
Cím:	High-diversity sowing in establishment gaps: a promising new tool for enchancing grassland biodiversity / Valkó Orsolya, Deák Balázs, Török Péter, Anita Kirmer, Sabine Tischew, Kelemen András, Tóth Katalin, Miglécz Tamás, Radócz Szilvia, Sonkoly Judit, Tóth Edina, Kiss Réka, Kapocsi István, Tóthmérész Béla
Dátum:	2016
ISSN:	0722-494X
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban Alkali grassland grazing loess grassland seed mixture species establishment weed control
Megjelenés:	Tuexenia 36 (2016), p. 359-378. -
További szerzők:	Deák Balázs (1978-) (biológus) Török Péter (1979-) (biológus-ökológus) Kirmer, Anita (1970-) (biológus) Tischew, Sabine (1964-) (biológus) Kelemen András (1986-) (biológus-ökológus) Tóth Katalin (1988-) (biológus) Miglécz Tamás (1986-) (biológus ökológus) Radócz Szilvia (1988-) (biológus) Sonkoly Judit (1989-) (biológus) Tóth Edina (1990-) (biológus) Kiss Réka (1990-) (biológus, ökológus) Kapocsi István (1960-) Tóthmérész Béla (1960-) (ökológus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat Szerző által megadott URL DOI
Borító:
Saját polcon: