TY - CHAP AU - Molnár, Ákos ED - Vidra, Tamás TI - Vízibogarak (Coleoptera: Hydradephaga, Hydrophiloidea) faunisztikai és ökológiai vizsgálata a Tápió-vidéken T2 - Természetvédelem és kutatás a Tápió-vidéken : tanulmánygyűjtemény = Nature conservation and research in the Tápió region PB - Duna-Ipoly Nemzeti Park Igazgatóság CY - Budapest SN - 9786155241031 T3 - Rosalia, ISSN 1787-825X ; 7. PY - 2012 SP - 291 EP - 310 PG - 20 UR - https://m2.mtmt.hu/api/publication/2724451 ID - 2724451 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Molnár, Ákos AU - Oláh, János AU - Szekeres, József AU - Boda, Pál ED - Baranyai, A ED - Benkő, D TI - Effect of Livestock Grazing on Water Beetle (Coleoptera) and Bug (Heteroptera) Assemblages in a Restored Salt Marsh: Different Responses to the Same Treatment T2 - Wetlands: Management, Restoration and Conservation PB - Nova Science Publishers CY - New York, New York SN - 9781621009184 T3 - Environmental research advances series ; Environmental remediation technologies, regulations and safety. PY - 2012 SP - 167 EP - 183 PG - 17 UR - https://m2.mtmt.hu/api/publication/2086208 ID - 2086208 LA - English DB - MTMT ER - TY - JOUR AU - Molnár, Ákos AU - Hegedüs, Ramón AU - Kriska, György AU - Horváth, Gábor TI - Effect of cattail (Typha spp.) mowing on water beetle assemblages: changes of environmental factors and the aerial colonization of aquatic habitats JF - JOURNAL OF INSECT CONSERVATION J2 - J INSECT CONSERV VL - 15 PY - 2011 IS - 3 SP - 389 EP - 399 PG - 11 SN - 1366-638X DO - 10.1007/s10841-010-9347-6 UR - https://m2.mtmt.hu/api/publication/1761506 ID - 1761506 AB - Some studies found no, or weak evidence that dense monotypic cattail (Typha spp.) stands exclude water beetle species from aquatic habitats, or modify aquatic beetle assemblages. Other studies suggest that cattail may reduce the chance of aerial water beetle colonization, and decreases water temperature; negatively affecting these insects. We examined the response of aquatic beetle assemblages to the mowing of cattail (Typha angustifolia L., T. latifolia L.) in a freshwater marsh. Following removal of cattail at the water level in experimental plots, aquatic beetles were sampled both in mowed and intact (control) plots weekly, through a month in the spring of 2008. Aquatic beetles were more abundant in mowed plots. Species richness was the same, but it showed different patterns in mowed and intact plots. Shannon's diversity was similar between treatments, while evenness was lower in mowed plots. 29% of the aquatic beetles showed a strong preference for mowed plots, and 15% preferred the control plots. Water temperature was an important factor, with mowed plots having higher water temperatures because of increased solar radiation. Polarization visibility of the water surface was also a factor, since aerially colonizing (flying) aquatic beetles use horizontally polarized light reflected from the water surface to seek potential locations. Using imaging polarimetry, we showed that mowing strongly enhanced the water-reflected polarized light signal, because it reduced the screening effect of cattail leaves, which made the visual detection of water easier. Our results suggest that cattail mowing is a useful method in aquatic beetle conservation: it increases the chance of aerial colonization due to the enhanced polarization visibility of the water surface, and creates a habitat for more abundant assemblages otherwise excluded by the monodominant dense cattail stands. Thus, sustaining hemi-marsh conditions with vegetated and mowed areas is advisable to maximize overall aquatic beetle diversity. LA - English DB - MTMT ER - TY - CONF AU - Molnár, Ákos TI - A vízibogarak biodiverzitása és természetvédelmi helyzete a nemzetközi és hazai kutatások tükrében T2 - VII. Makroszkópikus Vízi Gerinctelenek Kutatási Konferencia PY - 2010 SP - 33 UR - https://m2.mtmt.hu/api/publication/1994260 ID - 1994260 LA - Hungarian DB - MTMT ER - TY - CONF AU - Molnár, Ákos TI - Gyékénykaszálás hatása vízibogár-közösségekre T2 - VI. Makroszkópikus Vízi Gerinctelenek Kutatási Konferencia PY - 2009 SP - 40 UR - https://m2.mtmt.hu/api/publication/1994259 ID - 1994259 LA - Hungarian DB - MTMT ER - TY - GEN AU - Molnár, Ákos TI - Vizesélőhely-kezelési módszerek hatásai vízibogarakra PY - 2009 UR - https://m2.mtmt.hu/api/publication/1993030 ID - 1993030 N1 - [Előadás] LA - Hungarian DB - MTMT ER - TY - CHAP AU - Molnár, Ákos ED - [Czech, University of Life Sciences Faculty of Environmental Sciences] TI - Wetland management techniques and aquatic beetles – the effects of planting, mowing and grazing T2 - 2nd European Congress of Conservation Biology: "Conservation biology and beyond: from science to practice" PB - Wiley-Blackwell CY - Prague SN - 9788021319615 PY - 2009 SP - 195 UR - https://m2.mtmt.hu/api/publication/1992420 ID - 1992420 LA - English DB - MTMT ER - TY - JOUR AU - Molnár, Ákos AU - Csabai, Zoltán Szabolcs AU - Tóthmérész, Béla TI - Influence of flooding and vegetation patterns on aquatic beetle diversity in 3 constructed wetland complex JF - WETLANDS J2 - WETLANDS VL - 29 PY - 2009 IS - 4 SP - 1214 EP - 1223 PG - 10 SN - 0277-5212 DO - 10.1007/BF03185922 UR - https://m2.mtmt.hu/api/publication/1251227 ID - 1251227 LA - English DB - MTMT ER - TY - CONF AU - Molnár, M AU - Molnár, Ákos AU - Farkas, J TI - Vízibogár-közösségek (Coleoptera) vizsgálata autópálya melletti vizes élőhelyeken: A víztestek korának hatása T2 - V. Makroszkópikus Vízi Gerinctelenek Kutatási Konferencia PY - 2008 SP - 28 UR - https://m2.mtmt.hu/api/publication/1994256 ID - 1994256 LA - Hungarian DB - MTMT ER - TY - CONF AU - Molnár, Ákos TI - Vízibogár-faunisztikai adatok a Tápió-vidékről T2 - V. Makroszkópikus Vízi Gerinctelenek Kutatási Konferencia PY - 2008 SP - 28 UR - https://m2.mtmt.hu/api/publication/1994248 ID - 1994248 LA - Hungarian DB - MTMT ER -