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001-es BibID:	BIBFORM074978
Első szerző:	Kenyeres Zoltán
Cím:	Enhancement of a declining European ground squirrel (Spermophilus citellus) population with habitat restoration / Kenyeres Zoltán, Bauer Norbert, Nagy Lajos, Szabó Szilárd
Dátum:	2018
ISSN:	1617-1381
Megjegyzések:	The European ground squirrel is a vulnerable species in Europe, and a critically endangered species in the north-western part of its range. In Hungary, although there are several robust populations on a European scale, we are also witnessing a process of decline. Local individual numbers of the focal species decreased quickly until 2011, caused by the drastic reduction in the grazing and mowing of its habitat. In response to the decline of the focal species' population, a habitat restoration project was started in 2012 in order to stop and reverse this process. We studied the interventions for habitat restoration (elimination of scrubs and Elaeagnus angustifolia trees, grazing and mechanical mowing) between 2012 and 2015. In the monitoring program the number of European ground squirrel specimens was estimated by the quadrat-method and a small-scale transect survey. Potentially the most effective parameters of vegetation, soil and macroclimate were used as predictor variables. The results of our monitoring study showed that the most significant factors in the differences in the individual numbers were the height of the vegetation, and the depth and percentage of the sand and silt fractions of the soil. The density of Spermophilus citellus was positively affected by the cover of xeric grasses and therophyta plant species, soil depth, the percentage of sand and silt fractions of the soil, and was negatively affected by height of vegetation, cover of scrub, tall-herb plant species, and the percentage of the gravel fraction of the soil. Accordingly, the soil conditions of the target areas should be assessed in advance in order to achieve success in supplying the European ground squirrel population. This could help in the successful planning of interventions and relocation attempts in order to repatriate European ground squirrel populations.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban soil vegetation structure grazing abandonment Elaeagnus angustifolia reconolization
Megjelenés:	Journal for Nature Conservation. - 45 (2018), p. 98-106. -
További szerzők:	Bauer Norbert Nagy Lajos Szabó Szilárd (1974-) (geográfus)
Pályázati támogatás:	Higher Education Institutional Excellence Programme of the Ministry of Human Capacities in Hungary, within the framework of the 4. thematic program of the University of Debrecen Egyéb
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001-es BibID:	BIBFORM037383
Első szerző:	Szabó Szilárd (geográfus)
Cím:	Distance models in ecological network management : A case study of patch connectivity in a grassland network / Szabó Szilárd, Novák Tibor József, Elek Zoltán
Dátum:	2012
Megjegyzések:	Landscape connectivity is a key issue of nature conservation and distance parameters are essential for the calculation of patch level metrics. For such calculations the so-called Euclidean and the least cost distance are the most widespread models. In present work we tested both distance models for landscape connectivity, using connectivity metrics in the case of a grassland mosaic, and the ground beetle Pterostichus melas as a focal species. Our goal was to explore the dissimilarity between the two distance models and the consequent divergence from the calculated values of patch relevance in connectivity. We found that the two distance models calculated the distances similarly, but their estimations were more reliable over short distances (circa 500 m), than long distances (circa 3000 m). The variability in the importance of habitat patches (i.e. patch connectivity indices) was estimated by the difference between the two distance models (Euclidean vs. least cost) according to the patch size. The location of the habitat patches in the matrix seemed to be a more important factor than the habitat size in the estimation of connectivity. The uncertainty of three patch connectivity indices (Integral Index of Connectivity, Probability of Connectance and Flux) became high above a habitat size of 5 ha. Relevance of patches in maintaining connectivity varied even within small ranges depending on the estimator of distance, revealing the careful consideration of these methods in conservation planning.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban Distance models Matrix effect NDVI Patch connectivity Pterostichus melas
Megjelenés:	Journal for Nature Conservation. - 20 : 5 (2012), p. 293-300. -
További szerzők:	Novák Tibor (1973-) (geográfus) Elek Z.
Pályázati támogatás:	TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Bolyai János Kutatási Ösztöndíj Egyéb
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001-es BibID:	BIBFORM083298
Első szerző:	Török Péter (biológus-ökológus)
Cím:	Recovery of native grass biodiversity by sowing on former croplands : is weed suppression a feasible goal for grassland restoration? / Péter Török, Tamás Miglécz, Orsolya Valkó, András Kelemen, Balázs Deák, Szabolcs Lengyel, Béla Tóthmérész
Dátum:	2012
ISSN:	1617-1381
Megjegyzések:	Grassland restoration on former croplands offers good opportunity to mitigate the loss of grassland biodiversity. Weed suppression can be another benefit, which becomes increasingly important because of the high recent rate of abandonment of arable lands in Central and Eastern Europe. Our aim was to evaluate the usefulness of sowing two low-diversity seed mixtures followed by annual mowing, a frequently used restoration technique, in weed suppression. We found that rapidly forming cover of sown grasses effectively suppressed short-lived weeds and their germination except in the first year. The detected dense seed bank of short-lived weeds points out the possibility and threat of later weed infestation. In the short run perennial weeds cannot be suppressed easily by sowing and annual mowing. We found that the effectiveness of seed sowing followed by mowing in weed suppression can be different on sites with different history or seed mixture. Rapidly establishing perennial weeds, such as Agropyron species were only detected in former alfalfa fields; Cirsium arvense was found in former cereal and sunflower fields but not in former alfalfa fields. We found that the rate of weed suppression and success was influenced by the seed mixtures used. In several alkali restorations the high proportion of perennial weeds was detected in year 3. In loess restorations, much lower scores were typical. This was likely caused by the different seed mixture used. The loess seed mixture contained seeds of a clonally spreading tall-grass, Bromus inermis, which could compete more effectively with clonally spreading weeds, than could short grass species with or without tussock forming. Our findings indicate that post-restoration management require carefully designed actions that are fine-tuned addressing specific threats at the site level.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal for Nature Conservation. - 20 : 1 (2012), p. 41-48. -
További szerzők:	Miglécz Tamás (1986-) (biológus ökológus) Valkó Orsolya (1985-) (biológus) Kelemen András (1986-) (biológus-ökológus) Deák Balázs (1978-) (biológus) Lengyel Szabolcs (1971-) (biológus) Tóthmérész Béla (1960-) (ökológus)
Pályázati támogatás:	LIFE04NAT/HU/000119 egyéb OTKA NN F78887 OTKA TÁMOP 4.2.1./B-09/1/KONV-2010-0007 TÁMOP
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