@article{MTMT:34500851, title = {Functional properties of planktic microalgae determine their habitat selection}, url = {https://m2.mtmt.hu/api/publication/34500851}, author = {Görgényi, Judit and Török-Krasznai, Enikő and Lukács, Áron and Kókai, Zsuzsanna and Bácsiné Béres, Viktória and Várbíró, Gábor and Ács, Éva and Kiss, Keve Tihamér and Tóthmérész, Béla and Borics, Gábor}, doi = {10.1007/s10750-023-05421-1}, journal-iso = {HYDROBIOLOGIA}, journal = {HYDROBIOLOGIA}, volume = {851}, unique-id = {34500851}, issn = {0018-8158}, abstract = {In this study, we aim to investigate how the functional properties of microalgae help to delineate the major groups of aquatic habitats. Using functional trait-based and Reynolds’ functional group-based approaches similarities of the microalgal flora of all aquatic habitats occurring in Hungary were compared. The habitats covered the whole size spectrum of standing waters (10-2–108m2) and water currents (watershed: 102–1011m2), , limnological and chemical properties. Both functional trait-based and functional group-based habitat classifications overrode the hydromorphology-based typology, however, functional group-based clusters showed closer resemblance to limnological-hydromorphological types than clusters created by trait-based approaches both for qualitative and quantitative data. Most of the aquatic habitats that have similar limnological characteristics showed resemblance in the functional properties of their microflora. Rivers and river-related habitats were the most diverse functionally. These were followed by standing waters with extended macrophyte coverage. The small, unique habitats displayed the lowest functional richness. The occurrence of several functional groups in some extreme habitats implies two alternative explanations: first, the habitat template of the groups is wider than defined in the original description; second, detailed information on the autecology of species assigned to a functional group necessitates the creation of new groups specific for the unique habitats.}, keywords = {PHYTOPLANKTON; habitat selection; TRAIT COMPOSITION}, year = {2024}, eissn = {1573-5117}, pages = {801-821}, orcid-numbers = {Kókai, Zsuzsanna/0000-0003-0315-9343; Várbíró, Gábor/0000-0001-5907-3472; Ács, Éva/0000-0003-1774-157X} } @article{MTMT:34163944, title = {Phytoplankton biomass and functional composition in the Danube River and selected tributaries: a case study Joint Danube Survey 4}, url = {https://m2.mtmt.hu/api/publication/34163944}, author = {Stanković, Igor and Hanžek, Nikola and Mischke, Ute and Krisa, Harald and Velická, Zuzana and Török-Krasznai, Enikő and Kiss, Keve Tihamér and Belkinova, Detelina and Bălan, Marinela and Amăriucăi, Vlad and Diaconu, Ionela and Borics, Gábor}, doi = {10.1007/s10750-023-05359-4}, journal-iso = {HYDROBIOLOGIA}, journal = {HYDROBIOLOGIA}, volume = {851}, unique-id = {34163944}, issn = {0018-8158}, abstract = {In 2019, phytoplankton and environmental parameters were analysed monthly during the growing season from April to September at 26 sampling sites in the Danube and 10 additional sampling sites in the main tributaries as part of the Joint Danube Survey 4, organised by the ICPDR. Our results showed that both phytoplankton biomass and composition follow the River Continuum Concept on free-flowing sections, but also responds to hydromorphological changes where the largest dam Iron Gate represents the largest interruption of the river and the phytoplankton continuum. Besides longitudinal interruption, water residence time was the most important factor for phytoplankton composition, while nutrients were less relevant. The low phytoplankton biomass and its composition in the Danube support the oligotrophication trend, but this one-year study could not confirm it with certainty. Phytoplankton is the most important autotrophic component in the Upper and Middle Danube, where environmental conditions do not support the optimal growth of other river flora. The predominant FGs coda were A, C and D as a typical potamoplankton component, while the codon TB occurs throughout the Danube but is more prominent in the Upper reach and other river sections with higher discharge events.}, keywords = {Hydromorphology; oligotrophication; potamoplankton; river continuum concept; Reynold’s functional groups}, year = {2024}, eissn = {1573-5117}, pages = {973-998}, orcid-numbers = {Stanković, Igor/0000-0001-7341-144X; Hanžek, Nikola/0009-0004-4904-8424; Belkinova, Detelina/0000-0003-0738-4871} } @article{MTMT:34506155, title = {Alkalmas-e a kavitációs vízkezelés az algavirágzások csúcsainak letörésére?}, url = {https://m2.mtmt.hu/api/publication/34506155}, author = {Ács, Éva and Bíró, Tibor and Béres Deák, László and Duleba, Mónika and Grigorszky, István and Kiss, Keve Tihamér and Németh, Zoltán and Papp, András and Vadkerti, Edit}, doi = {10.32567/hm.2023.3.2}, journal-iso = {HADMÉRNÖK}, journal = {HADMÉRNÖK}, volume = {18}, unique-id = {34506155}, abstract = {Egy kísérleti kavitációs berendezés tervezésével, létrehozásával és kisüzemi alkalmazásával a szennyezett vizek egyik lehetséges tisztítási módját vizsgáltuk. A kísérleti berendezés mobil kivitelű, és alkalmas különböző szennyezettségű vizek tisztítására. Bemutatjuk a kavitáció hatását különböző mikroszkopikus méretű élőlényekre. Először egy hígított zöldalgatenyészetet vizsgáltunk, megállapítottuk, hogy 16–32 perces kavitáció több mint 10–20%-kalcsökkenti a klorofillkoncentrációt és az ép sejtek arányát. Biológiailag bontható szennyvízzel kevert algás halastóvízben, kavitáció hatására a cianobaktériumok, ostoros algák mennyisége 40–80%-kalcsökkent, a zöldalgáknál minimális volt a csökkenés. Ezeknél a méréseknél síkszelepes, nagynyomású kavitációgenerátort alkalmaztunk. Bizonyítottuk,hogy a hajók ballasztvize és a szennyvizek mikrobiótája mennyiségének csökkentésére a kavitációs vízkezelés ígéretes megoldásnak tekinthető, de figyelemmel kell lenni arra, hogy csak elpusztul a mikrobióta, de nem tűnik el a vízből.}, year = {2023}, eissn = {1788-1919}, pages = {19-32}, orcid-numbers = {Ács, Éva/0000-0003-1774-157X; Bíró, Tibor/0000-0002-5553-9850; Béres Deák, László/0000-0002-1558-2109; Vadkerti, Edit/0000-0001-9513-5546} } @article{MTMT:34449902, title = {Halamphora taxa in Hungarian soda pans and shallow soda lakes detected via metabarcoding and microscopic analyses}, url = {https://m2.mtmt.hu/api/publication/34449902}, author = {Ács, Éva and Bíró, Tibor and Boros, Emil and Dobosy, Péter and Duleba, Mónika and Földi, Angéla and Kiss, Keve Tihamér and Levkov, Zlatko and Orgoványi, Péter and Pálné Szén, Orsolya and Trábert, Zsuzsa and Vadkerti, Edit and Grigorszky, István}, doi = {10.3897/mbmg.7.111679}, journal-iso = {METABARCODING AND METAGENOMICS}, journal = {METABARCODING AND METAGENOMICS}, volume = {7}, unique-id = {34449902}, issn = {2534-9708}, abstract = {The research presented investigates whether DNA-based metabarcoding can replace the morphology-based identification of diatom taxa in the ecological status assessments of aquatic habitats. When comparing data obtained with microscopy and metabarcoding, significant deviations have been noticed. One of the main reasons includes the incompleteness of the reference database used for taxonomic annotation of sequences. The database library should be complemented with species inhabiting unique habitats and having specific environmental requirements representing environmental endpoints for genetic diversification. Soda pans and soda lakes are examples of an extreme habitat with the loss of sodic character as the main threat; thus, accurate identification of species and exact information on their salinity tolerance is essential for adequate ecological status assessment. In the present study, by using microscopy and metabarcoding, we investigated taxa of the genus Halamphora that are common in soda pans and soda lakes. We detected six species of which Halamphora dominici and H. veneta occurred frequently and often in high abundance (it was often dominant having relative abundance higher than 5%). Analyses of DNA data confirmed the separation of the two species; as a result, the reference database library has been supplemented with sequences of H. dominici . Furthermore, we have confirmed that this species, which is a significant indicator of sodic character, shows a positive correlation with salinity.}, keywords = {Diatoms; Metabarcoding; Halamphora; halobity; soda pans/lakes}, year = {2023}, pages = {413-438}, orcid-numbers = {Ács, Éva/0000-0003-1774-157X; Bíró, Tibor/0000-0002-5553-9850; Pálné Szén, Orsolya/0000-0002-6610-3681; Vadkerti, Edit/0000-0001-9513-5546} } @article{MTMT:34431758, title = {Reskóné Dr. Nagy Mária – Ács Éva, Borsodi Andrea, Kiss Keve Tihamér és Teszárné Nagy Mariann megemlékezése}, url = {https://m2.mtmt.hu/api/publication/34431758}, author = {Ács, Éva and Kériné Borsodi, Andrea and Kiss, Keve Tihamér and Teszárné, Nagy Mariann}, journal-iso = {HIDROL KOZL}, journal = {HIDROLÓGIAI KÖZLÖNY}, volume = {103}, unique-id = {34431758}, issn = {0018-1323}, year = {2023}, eissn = {2939-8495}, pages = {80-80}, orcid-numbers = {Ács, Éva/0000-0003-1774-157X; Kériné Borsodi, Andrea/0000-0002-3738-7937} } @article{MTMT:34363198, title = {Quantitative Morphometric Analysis of Morphologically Similar Species of Fragilaria (Fragilariaceae, Bacillariophyta) Allows Detection of Non-Indigenous Taxa: A Case Study from Lake Ladoga (North of European Russia)}, url = {https://m2.mtmt.hu/api/publication/34363198}, author = {Rusanov, Alexander G. and Gololobova, Maria A. and Kolobov, Mikhail Y. and Duleba, Mónika and Georgiev, Anton A. and Grigorszky, István and Kiss, Keve Tihamér and Ács, Éva and Somlyai, Imre}, doi = {10.3390/w15223994}, journal-iso = {WATER-SUI}, journal = {WATER}, volume = {15}, unique-id = {34363198}, abstract = {In Lake Ladoga (northwestern Russia), we found a diatom, putatively Fragilaria sublanceolata-baikali, an endemic species from Lake Baikal (southeastern Siberia, Russia). To determine whether this population matches a previously recognized species from Lake Baikal and assess how it differs from other similar Fragilaria taxa, we studied the valve morphology of three morphologically similar Fragilaria populations (the putative F. sublanceolata-baikali, F. pectinalis and F. perminuta) sampled in Lake Ladoga, along with a population of F. sublanceolata-baikali sampled in Lake Baikal. We used light and scanning electron microscopy with a combination of traditional and geometric morphometric methods. To analyze covariation between the valve shape and size (i.e., allometry), we examined differences in the ontogenetic–allometric trajectories at both the interspecific and intraspecific levels. In addition, the effect of size correction of the valve shape on species differentiation was tested. Traditional morphometrics revealed that F. sublanceolata-baikali is distinguished from F. pectinalis and F. perminuta by valve length, while F. pectinalis and F. perminuta are distinguished by striae density. All three species of Fragilaria showed separate and parallel allometric trajectories. In contrast, the two populations of F. sublanceolata-baikali were on a common allometric trajectory, indicating the conspecificity between these populations. Prior to allometric correction, geometric morphometrics was not able fully discriminate between the three Fragilaria species. After allometric correction, the three Fragilaria species were clearly separated in a size-corrected morphospace, whereas the two populations of F. sublanceolata-baikali formed a tightly overlapping group. Thus, we conclude that geometric morphometrics can reliably distinguish between these morphologically similar species of Fragilaria, but only after accounting for allometric shape variation. Our study confirmed morphological similarity between the two geographically distant populations of F. sublanceolata-baikali, which indicates that this taxon can be considered as invasive in Lake Ladoga.}, keywords = {INVASIONS; Lake Baikal; Fragilaria; Lake Ladoga; geometrics morphometrics; periphytic diatoms; allometric trajectories; size-correction}, year = {2023}, eissn = {2073-4441}, orcid-numbers = {Gololobova, Maria A./0000-0003-0781-603X; Ács, Éva/0000-0003-1774-157X} } @book{MTMT:34224787, title = {Képes útmutató Magyarország leggyakoribb bevonatlakó kovaalgáihoz (Bacillariophyceae)}, url = {https://m2.mtmt.hu/api/publication/34224787}, isbn = {9786156598189}, author = {Ács, Éva and Bíró, Tibor and Buczkó, Krisztina and Duleba, Mónika and Földi, Angéla and Kiss, Keve Tihamér and Orgoványi, Péter and Trábert, Zsuzsa}, editor = {Ács, Éva}, publisher = {Ludovika Press}, unique-id = {34224787}, abstract = {A könyv, amelyet az Olvasó a kezében tart, Magyarország leggyakoribb bevonatlakó kovaalgáit bemutató határozási segédlet, amelynek elkészítését az a 2019-ben és 2020-ban zajló országos felmérés tette lehetővé. Ennek során többek között olyan felszíni vizekből gyűjtöttünk mintákat, amelyeket korábban egyáltalán nem vizsgáltak. Az összeállításban csak azok a taxonok kaptak helyet, amelyek ezen felmérés során legalább egy mintában dominánsak voltak (relatív egyedszámuk elérte az 5%-ot). A könyv megírásával a felszíni vizeknek az Európai Unió Víz Keretirányelve (EU VKI) által előírt ökológiai állapotértékelését kívántuk segíteni azáltal, hogy a bevonatban előforduló legfontosabb taxonokhoz határozási segédletet nyújtunk. Mivel az EU VKI a felszíni vizek monitorozása során a fénymikroszkóp használatát írja elő, így jelen munkában mi is alapvetően a fénymikroszkópos bélyegekre fókuszáltunk, de ahol a határozást az ultrastrukturális bélyegek megismerése is segítheti, ott pásztázó elektronmikroszkópos képeket is közöltünk.}, year = {2023}, orcid-numbers = {Ács, Éva/0000-0003-1774-157X; Ács, Éva/0000-0003-1774-157X; Bíró, Tibor/0000-0002-5553-9850} } @article{MTMT:33282833, title = {Rarity of microalgae in macro, meso, and microhabitats}, url = {https://m2.mtmt.hu/api/publication/33282833}, author = {Görgényi, Judit and Török-Krasznai, Enikő and Ács, Éva and Kiss, Keve Tihamér and Botta-Dukát, Zoltán and Végvári, Zsolt and Lukács, Áron and Várbíró, Gábor and Bácsiné Béres, Viktória and Kókai, Zsuzsanna and Tóthmérész, Béla and Borics, Gábor}, doi = {10.1080/20442041.2022.2152247}, journal-iso = {INLAND WATERS}, journal = {INLAND WATERS}, volume = {13}, unique-id = {33282833}, issn = {2044-2041}, abstract = {Climate change and human-induced habitat degradations result in loss of species diversity in natural ecosystems. While the extinction of macroscopic organisms has been well documented in both the scientific literature and the public media, we have only limited knowledge on the loss of microscopic elements of the ecosystems. Since rarity coincides with the increased risk of extinction, we investigated the commonness and rarity of microalgae in the Pannonian ecoregion. We reviewed the published literature of microalgal research in Hungary over the last 140 years and created a species-by-site matrix containing 2489 algae species and 1145 localities. Analysing this dataset, we found that although the core-satellite hypothesis suggests a bimodal site occupancy distribution, microalgae displayed a unimodal pattern with high number of rarely occurring species. We also demonstrated that the well-known negative relationship between the body size of organisms and the number of occupied habitats also holds for microalgae. Rarity values of taxa have a phylogenetic signal indicating that in terms of rarity, closely related species (desmids, dinoflagellates, euglenophytes) show considerable similarities. The various habitat types showed differences in the number of rare taxa. Small and medium-sized habitats (bog lakes, streams, oxbows) hosted the majority of rare species. These results highlight the conservation importance of small habitats in preserving microbial diversity.}, keywords = {PHYTOPLANKTON; MICROALGAE; Habitat types; rarity; habitat specificity; rarity metrics}, year = {2023}, eissn = {2044-205X}, pages = {231-246}, orcid-numbers = {Ács, Éva/0000-0003-1774-157X; Botta-Dukát, Zoltán/0000-0002-9544-3474; Várbíró, Gábor/0000-0001-5907-3472; Kókai, Zsuzsanna/0000-0003-0315-9343; Tóthmérész, Béla/0000-0002-4766-7668} } @article{MTMT:33180178, title = {Metabarcoding as an effective complement of microscopic studies in revealing the composition of the diatom community – a case study of an oxbow lake of Tisza River (Hungary) with the description of a new Mayamaea species}, url = {https://m2.mtmt.hu/api/publication/33180178}, author = {Bíró, Tibor and Duleba, Mónika and Földi, Angéla and Kiss, Keve Tihamér and Orgoványi, Péter and Trábert, Zsuzsa and Vadkerti, Edit and Wetzel, Carlos E. and Ács, Éva}, doi = {10.3897/mbmg.6.87497}, journal-iso = {METABARCODING AND METAGENOMICS}, journal = {METABARCODING AND METAGENOMICS}, volume = {6}, unique-id = {33180178}, issn = {2534-9708}, abstract = {Diatoms are valuable bioindicators and their traditional classification and identification are mainly based on the morphological characteristics of their frustules. However, in recent years, DNA-based methods have been proposed and are rapidly growing in the scientific literature as a complementary tool to assess the ecological status of freshwaters. Diatom-based ecological status assessment uses indices calculated from sensitivity and tolerance values as well as relative abundance of species. Correct assessment requires an accurate identification of species. In the present study, diatom assemblages of an oxbow lake were investigated using light and scanning electron microscopy as well as metabarcoding using rbc L marker, and the identification results were compared, intending to match barcode sequences of species that are currently missing in the diatom reference database. The investigated oxbow is an important wetland for bird conservation, although it is impacted by land use. Taxon lists based on morphology and metabarcoding considerably differed when bioinformatics analysis involved DADA2 pipeline with Diat.barcode database. Previously unknown sequence variants of four pennate species were found with additional BLAST search. Using phylogeny and p-distance calculations sequences could be matched to three small-celled naviculoid species that were found under a microscope. One of them was found to be a new species of the genus Mayamaea and was described as a new species, Mayamaea ectorii . Additionally, spatial distribution maps for several small-celled naviculoid species are provided for the Hungarian territory.}, keywords = {OXBOW; Metabarcoding; new diatom species; Mayamaea}, year = {2022}, pages = {319-336}, orcid-numbers = {Bíró, Tibor/0000-0002-5553-9850; Vadkerti, Edit/0000-0001-9513-5546; Wetzel, Carlos E./0000-0001-5330-0494; Ács, Éva/0000-0003-1774-157X} } @article{MTMT:32382913, title = {Relative importance of climate and spatial processes in shaping species composition, functional structure and beta diversity of phytoplankton in a large river}, url = {https://m2.mtmt.hu/api/publication/32382913}, author = {Alexander G., Rusanov and Bíró, Tibor and Kiss, Keve Tihamér and Buczkó, Krisztina and Grigorszky, István and Hidas, András and Duleba, Mónika and Trábert, Zsuzsa and Földi, Angéla and Ács, Éva}, doi = {10.1016/j.scitotenv.2021.150891}, journal-iso = {SCI TOTAL ENVIRON}, journal = {SCIENCE OF THE TOTAL ENVIRONMENT}, volume = {807}, unique-id = {32382913}, issn = {0048-9697}, abstract = {Although metacommunity dynamics of lentic phytoplankton are relatively well-documented, studies on the role of environmental and spatial processes in shaping phytoplankton communities of large rivers are still scarce. Here, we examined six phytoplankton data sets, which were collected in 1978-2017 from large river-scale segments (mean spatial extent 1117 km) in the Danube River. Our aim was to elucidate role of climatic, spatial and temporal predictors in variation of phytoplankton beta diversity using variance partitioning for compositions of species and functional groups sensu Reynolds. We hypothesised that phytoplankton beta diversity (measured as average distance to group centroid) would be positively related to both climatic heterogeneity and spatial extent used as a proxy for dispersal limitation. Additionally, we tested alternative dispersal models to evaluate different spatial processes structuring phytoplankton community. Our results revealed that spatial variables were more important than climatic factors in controlling both species and functional group composition. Climatic heterogeneity showed significant positive relationship with beta diversity. In contrast, there was no significant relationship between beta diversity and spatial extent, suggesting that spatial effect on beta-diversity was attenuated by anthropogenic disturbance. The better performance of non-directional model compared to model of water directionality suggested that spatial dynamics of phytoplankton metacommunity was in large part regulated by differences in the regional species pools. Spatial and temporal variables outperformed environmental (including climatic) factors in explaining phytoplankton metacommunity structure, indicating that phytoplankton exhibited strong biogeographical patterns. Thus, dispersal limitation interfered with species-sorting processes in determining phytoplankton community structure. In conclusion, our findings revealed that the development of a more reliable bioassessment program of the Danube River should be based on separation into basin regions.}, keywords = {Danube River; dispersal limitation; METACOMMUNITY STRUCTURE; biogeographical pattern; riverine phytoplankton; climatic heterogeneity}, year = {2022}, eissn = {1879-1026}, orcid-numbers = {Bíró, Tibor/0000-0002-5553-9850; Hidas, András/0000-0002-6030-8459; Ács, Éva/0000-0003-1774-157X} }