TY - JOUR AU - Szabó, Zoltán AU - Buczkó, Krisztina AU - Korponai, János AU - Luoto, T AU - Begy, RCs AU - Haliuc, A AU - Veres, D AU - Hamerlik, L AU - Csorba, R AU - Zsigmond, AR AU - Darabos, Gabriella AU - Méhes, Nikoletta AU - Kövér, Csilla AU - Magyari, Enikő Katalin TI - Two chironomid-inferred mean July air temperature reconstructions in the South Carpathian Mountains over the last 2000 years JF - HOLOCENE J2 - HOLOCENE VL - In press PY - 2024 SN - 0959-6836 DO - 10.1177/09596836241236353 UR - https://m2.mtmt.hu/api/publication/34753315 ID - 34753315 AB - We present chironomid-based reconstructions of mean July air temperature changes over the last 2000 years from Lake Latoriței (1530 m a.s.l.) in the Southern Carpathians. A multi-proxy analysis was performed along a 58 cm long sediment core and two training sets were used for quantitative July air temperature reconstructions: the Eastern-European (EE, 212 lakes) and the Finnish-Polish-Carpathian (FPC, 273 lakes). The transfer functions had a coefficient of determination (r2) 0.88 and 0.91 with a root mean squared error of prediction (RMSEP) 0.88°C and 1.02°C. Despite possible biases resulting from methodological problems and the ecological complexity of the chironomid response to both climatic and environmental changes, the agreement of the temperature reconstruction of Lake Latoriței with other alpine records suggests that the transfer function successfully reconstructed past summer temperatures between 750 and 1830 CE. Biases in the temperature reconstruction in the period before 750 and after 1830 CE were likely caused by increased abundance of rheophilic and semi-terrestrial chironomid species related to increased inflow activity before 750 CE and local land use changes after 1830 CE, which was also indicated by increasing deforestation and increasing lake productivity in the pollen and diatom records. Our results suggest that the region experienced a warm period between 750 and 1360 CE, and a cold period between 1360 and 1600 CE followed by fluctuating summer temperatures until 1830 CE. These events were associated with the so-called ‘Mediaeval Warm Period’ (MWP) and the ‘Little Ice Age’ (LIA), respectively. The inference models reconstructed a decrease in July air temperatures by 0.7°C–1.1°C during the LIA relative to the warmer MWP. We also demonstrated that the FPC training set gives better results, supporting that local/continental training sets are efficient to detect weak amplitude summer temperature changes in the Late-Holocene. LA - English DB - MTMT ER - TY - JOUR AU - Begy, Róbert-Csaba AU - Savin, Codrin-F. AU - Korponai, János AU - Magyari, Enikő Katalin AU - Kovács, Tibor TI - Investigation of the last two centuries sedimentation dynamics in high-altitude lakes of Southern Carpathians, Romania JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 IS - 1 PG - 10 SN - 2045-2322 DO - 10.1038/s41598-024-51812-2 UR - https://m2.mtmt.hu/api/publication/34510709 ID - 34510709 N1 - Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, 400084, Romania Interdisciplinary Research Institute On Bio-Nano-Sciences, Babes-Bolyai University, Cluj-Napoca, 400271, Romania Department of Water Supply and Sewerage, University of Public Service, Bajcsy-Zsilinszky utca 12–14, Baja, 6500, Hungary HUN-REN-MTM-ELTE Research Group for Palaeontology, Ludovika Tér 2, Budapest, 1083, Hungary Department of Environmental and Landscape Geography, Eötvös Loránd University, Pázmány Péter Stny 1/C, Budapest, 1117, Hungary Institute of Radiochemistry and Radioecology; Research Centre for Biochemical, Environmental and Chemical Engineering, University of Pannonia, Veszprém, 8200, Hungary Export Date: 19 March 2024 Correspondence Address: Kovács, T.; Institute of Radiochemistry and Radioecology; Research Centre for Biochemical, Hungary; email: kovacs.tibor@mk.uni-pannon.hu AB - This study investigates the last two centuries sedimentation dynamics in four high-altitude lakes located in Southern Carpathians, Romania. Furthermore, a novel approach is proposed for identifying the anthropic or natural underlying causes, by comparison of the acceleration of the change in sedimentation rate with a baseline growth rate trend provided by an isolated peat bog. The high-resolution chronologies were developed using the 210 Pb dating technique and the CRS model. 137 Cs alternative time-marker validated the age-depth models and reassured the quality of the results. The results indicated several short-interval high sedimentation events within the lake cores, yielding up to five times the average rate for the investigated period. The cause of the high sedimentation episodes was generally attributed to anthropic activities (primarily road construction) and extreme natural events. A first-order derivative equation was employed to plot the acceleration in the sedimentation rate of the lakes with the peat bog baseline. The discrepancies between the acceleration trends highlighted significant deviations from the natural variation tendencies and provided preliminary data regarding the underlying causes of the intense sedimentation periods. LA - English DB - MTMT ER - TY - JOUR AU - Zsuga, Katalin AU - Korponai, János TI - Dr. Forró László – Zsuga Katalin és Korponai János megemlékezése JF - HIDROLÓGIAI KÖZLÖNY J2 - HIDROL KOZL VL - 103 PY - 2023 IS - 4 SP - 81 EP - 81 PG - 1 SN - 0018-1323 UR - https://m2.mtmt.hu/api/publication/34431729 ID - 34431729 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Binti Mahadi, Izzati Hanun AU - Báldi, Katalin AU - Korponai, János AU - Buczkó, Krisztina TI - Diatom-based paleoenvironmental reconstruction in Lake Balaton, Hungary (Tó34f) JF - STUDIA BOTANICA HUNGARICA J2 - STUD BOT HUNG VL - 54 PY - 2023 IS - 1 SP - 5 EP - 38 PG - 34 SN - 0301-7001 DO - 10.17110/StudBot.2023.54.1.5 UR - https://m2.mtmt.hu/api/publication/34210675 ID - 34210675 AB - A high-resolution diatom assemblage’s database was built on a 65 cm long sediment core (Tó34f), obtained from the Siófok Basin of Lake Balaton in 2017. Light microscope photo-documentation was developed out of 15,797 diatom valves. The pictures were arranged according to taxonomy from centric diatoms via araphids, monoraphids to biraphid forms. 30 categories were established to group the diatom taxa instead of species level identification requiring high level of expertise. Some (1) characteristic, and easily identifiable taxa (Karayevia clevei, Cavinula scutelloides) were distinguished on species level, (2) taxa were grouped at genus level (like Amphora, Aulacoseira, Neidium), while (3) were joined based on their morphological features. Two large groups were created based on this approach, the “light fragilarioids” and the “heavy fragilarioids”. Both groups contain diatoms with taxonomic problems, e.g. Staurosira, Staurosirella genera and other fragilarioids. This approach allowed us to make paleo-ecological reconstruction on (1) rough taxonomic data and (2) apply trait-based methods. Diatom assemblage’s zones were defined by CONISS clustering method, validated by the broken stick model. Though the planktonic trait (referring the high lake level) is insignificant (< 5%) in most of the studied record, but some peaks (>35%) point to high water level. The most recent trend of increasing number of planktonic diatoms is hypothesized to be due to the recent global warming. We demonstrated that traits are a good alternative to time and expertise demanding species-level determination of diatoms, thus a quick method is found for paleo-ecological reconstructions, while the photo-base good for detailed taxonomic work at a future time. LA - English DB - MTMT ER - TY - GEN AU - Tombor, Eszter AU - Szabó, Zoltán AU - Andreea-Rebeka, Zsigmond AU - Marta, Wojewódja-Przybyl AU - Krisztina, Buczkó AU - Korponai, János AU - Róbert-Csaba, Begy AU - Magyari, Enikő Katalin TI - Ecosystem response to climate change and human impact in South Carpathian alpine lakes: can we define restoration targets? CY - 2023.05.17-19 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34177863 ID - 34177863 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Al-Imari, Tiba Jassam Kaison AU - Lengyel, Edina AU - Korponai, János AU - Padisák, Judit AU - Stenger-Kovács, Csilla TI - Lake morphology as an important constraint for benthic diatoms in temperate, humic forest ponds JF - ECOLOGICAL INDICATORS J2 - ECOL INDIC VL - 155 PY - 2023 PG - 11 SN - 1470-160X DO - 10.1016/j.ecolind.2023.110939 UR - https://m2.mtmt.hu/api/publication/34147875 ID - 34147875 AB - Small lakes are among the most threatened ecosystems in the world. Their protection is of crucial importance since they support an unusually high biodiversity relative to their size. The present study aimed at selecting the main drivers, especially the role of the morphological variables, shaping benthic diatom communities in unique, but rarely investigated forest pond ecosystems in the temperate region, using traditional (species-based methods and diversity indices) and novel approaches (trait-based methods and functional diversity indices) of diatom ecology. Therefore, we analyzed the effects of the environmental (temperature, conductivity, colour, shading, pH, nutrient forms, anions) and morphological (surface area, depth) variables of 70 temperate, forest ponds located in two regions of Hungary on the composition (species- and trait-based) and diversity (traditional and functional) of their benthic diatom communities. Based on the multivariate analyses, no regional differences in the environmental and morphological variables were been observed among the ponds. Our results showed that both environmental variables and lake morphology had significant effects on the benthic diatom communities, but they contributed to their variation with different proportions. Environmental variables such as nutrient content (rsoluble reactive phosphate = 0.72) and conductivity (r = 0.65) affected mostly the species composition, and the traditional diversity metrics (rtotal phoshate = −0.42, rconductivity = −0.54). In contrast, morphological features of the ponds were the most important drivers of diatom trait composition. This functional response of diatoms manifested in the selection of species according to their size, shape and lifeforms, moreover, in changing of functional diversity. Overall, this study revealed the complex interplay between environmental variables and lake morphology in shaping the composition of benthic diatom communities. Furthermore, it highlights the necessity to apply different methods to understand the ecology and functioning of these special aquatic ecosystems. LA - English DB - MTMT ER - TY - JOUR AU - Jakab, Jázmin AU - Böjthe, Andrea AU - Soltész, Andor Gergő AU - Korponai, János AU - Gyulai, István TI - Paleolimnológiai módszerek alkalmazásának korlátai sekély állóvizek esetében JF - HIDROLÓGIAI KÖZLÖNY J2 - HIDROL KOZL VL - 103 PY - 2023 IS - 2 SP - 46 EP - 51 PG - 6 SN - 0018-1323 DO - 10.59258/hk.11449 UR - https://m2.mtmt.hu/api/publication/34019402 ID - 34019402 AB - Világszerte egyre inkább növekednek az aszályos időszakok, jelentősen csökkentek az állóvizeink vízszintjei. Paleolimnológiai vizsgálatok esetében az állóvizek üledékének tanulmányozása folyik, melynek segítségével a múltban lejátszódott folyamatok, illetve környezeti hatások elemzésére adódik lehetőség. Paleolimnológiai kutatások során, amikor az üledékben megőrződött szervezetek maradványait, beleértve a Cladocera maradványokat vizsgáljuk, a meder legmélyebb részéről szoktunk üledék mintát venni, mert a legmélyebb pontra sodródnak össze a maradványok. Hazánkban azonban a legnagyobb számban sekély vízterek fordulnak elő, így vizsgálatunk célja az volt, hogy megnézzük, sekély vízterek esetében célszerűbb lenne-e a több mintavételi pont kijelölése? A mintavételekre hat vízteret jelöltünk ki és mindegyik víztérből három mintát vettünk, úgy, hogy a mintavételi helyek legalább 75-100 m távolságban helyezkedjenek el egymástól. A medrekben a habitatok is hasonlóak voltak. Az eredmények azt mutatták, hogy egymástól 100 méteres távolságban lévő mintavételi ponton is különböző Cladocera egyedszámok és fajszámok azonosíthatók. LA - Hungarian DB - MTMT ER - TY - CHAP AU - Buczkó, Krisztina AU - Máthé, István AU - Jakab, Gusztáv AU - Tóth, Mónika AU - Braun, Mihály AU - Korponai, János AU - Ács, Éva AU - Karátson, Dávid AU - Magyari, Enikő Katalin ED - Karátson, Dávid ED - Veres, D. ED - Gertisser, R. ED - Magyari, Enikő Katalin ED - Jánosi, C. ED - Hambach, U. TI - A Szent Anna-kráter tavi-lápi fejlődéstörténete T2 - A Kárpátok legfiatalabb tűzhányója, a Csomád. Vulkánosság, őskörnyezet, ember és táj. PB - Tortoma Könyvkiadó CY - Barót SN - 9786069716472 PY - 2023 SP - 157 EP - 170 PG - 14 UR - https://m2.mtmt.hu/api/publication/33746530 ID - 33746530 LA - Hungarian DB - MTMT ER - TY - GEN AU - Szabó, Zoltán AU - Magyari, Enikő Katalin AU - Buczkó, Krisztina AU - Korponai, János AU - Tombor, Eszter TI - A Déli-Kárpátok hegyi tavainak ökoszisztéma változásai a növekvő légszennyezettség mellett az ipari forradalom kezdete óta CY - Visegrád PY - 2022 UR - https://m2.mtmt.hu/api/publication/34177846 ID - 34177846 LA - Hungarian DB - MTMT ER - TY - CONF AU - Magyari, Enikő Katalin AU - Pálfi, Ivett AU - Pósfai, Mihály AU - Buczkó, Krisztina AU - Demény, Attila AU - Czuppon, György AU - Szabó, Zoltán AU - Korponai, János AU - Szalai, Zoltán AU - Veres, D. AU - Arnaud, F. AU - Falus, György AU - Bihari, Árpád ED - Hassan, SG ED - de Porras, EM ED - Halac, SR. ED - Córdoba, FE TI - Stable isotopes, biogenic calcite crystal composition and biotic remains were used to infer Holocene paleoenvironmental conditions in Lake Balaton, the largest shallow waterbody in Central Europe T2 - Lagos, Memorias del Territorio PY - 2022 SP - 157 EP - 157 PG - 1 UR - https://m2.mtmt.hu/api/publication/33709053 ID - 33709053 N1 - FS17-ORAL PRESENTATIONS LA - English DB - MTMT ER -