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In this study, we present new distribution data of 79 alien plant species from Hungary collected over the last few years. Of the listed species, five are new to the Hungarian flora: Bidens connata, Dianthus giganteus, Guizotia abyssinica, Oenothera deflexa, Polypogon monspeliensis. Several occurrences of Bidens connata were recorded in riparian vegetation in the middle and lower sections of the Tisza river. Dianthus giganteus, a rarely planted ornamental, was encountered in closed grasslands in some parts of the Balaton Uplands and the Rába Valley. The East-African Guizotia abyssinica - probably introduced with fish food - appears occasionally so far. Oenothera deflexa was found in an old-field on Hatvan Plain, while Polypogon monspeliensis turned up in a gravel pit at Rábapaty. Symphoricarpos or-biculatus is presumably already a more widespread, under-mapped species, and is expected to occur near settlements mainly. We report the first occurrence of Artemisia verlotiorum - a species of high invasive potential - from the Szigetköz section of the Danube. We illustrate on maps the spread of Euphorbia maculata and Lepidium densiflorum, which spread rapidly in the last two to three decades and are now widespread in Hungary. We add ample new data to the distribution of Lepidium oblongum, which appeared along railway lines a few years ago and has spread intensively since then, and on Plantago coronopus, which has been present along transport routes for a decade. We report on the recurrent appearence of Eclipta prostrata in riparian environments, the rapid spread of Torilis nodosa in dry habitats in the settlements of the Balaton region, and clarify the current status of invasion for Panicum dichotomiflorum, P. riparium and Setaria faberi based on numerous new observations. For the first time, we report on the occurrence of Albizia julibrissin, Chenopodium pumilio, Euphorbia serpens and Parietaria judaica in Western Transdanubia, and that of Lepidium virginicum in the Transdanubian Mountains. In the future, Leymus arenarius is expected to become a dangerous invasive species in sandy areas, Elymus elongatus in dry grasslands, Buddleja davidii and Pyracantha coccinea in shrublands, and Pennisetum alopecuroides in urban lawns. [ABSTRACT FROM AUTHOR]

In this paper we report our floristic observations in urban and suburban areas of Szeged. We provide data from downtown, peri-urban, Tisza-side, railway-associated, and various ruderal habitats. In total, we present occurrence data for 40 plant species, seven of which are protected in Hungary. Some of the species presented have been already known in Szeged in some form, but their data are often very old (e.g. Allium rotundum, Chenopodium vulvaria, Reseda phyteuma, Thrincia nudicaulis) and/or the species are very rare in the Southern Great Plain (e.g. Chenopodium botrys, Ch. murale, Sherardia arvensis). Among protected species, the new occurrences of Acorus calamus on the banks of the Tisza and Reseda inodora in the new urban areas are worth mentioning. The occurrences of several alien species that recently appeared in the country are also described for which there are no previous records from the Crisicum or its southern part (e.g. Erigeron sumatrensis, Torilis nodosa); several of the latter are newer occurrences associated with railways (Chenopodium pumilio, Geranium purpureum, Lepidium oblongum etc.). We also report data from the riverbank of Tisza in Szeged and from the river itself (Bidens cernua, Crypsis schoenoides, Najas marina etc.). Cyperus esculentus and Ornithogalum refr actum have earlier records from the city as herbarium specimens, but due to their misidentification they have not been included in the public record. [ABSTRACT FROM AUTHOR]

In this paper I present my recently observed floristic data on the Danube-Tisza Interfluve. I report a total of 117 species of vascular plants, of which 27 are protected and 3 are strictly protected. As the landscape of the Danube-Tisza Interfluve is diverse, these data come from a wide range of habitats: disturbed and natural dry, mesophilic and wet grasslands, forest edges, and different weed communities. I also provide a considerable amount of data from various sec ondary habitats: forest plantations, cemeteries, buildings, habitats along railroads, road verges, dry canal beds, water-filled canals, and ruderal habitats in urban environments. My data cover a total of nine microregions, the most prominent of which are: the Bácska Loess Plain, the Bugac Sand Ridge, the Dorozsma-Majsa Sand Ridge, the Kiskunság Sand Ridge and the Kiskunság Loess Ridge. For protected plant species, most noteworthy are the new observations of Apium repens, Epipactis bugacensis, E. atrorubens, Ranunculus illyricus, Muscari botryoides, Ophrys sphegodes, Vicia biennis. From a phytogeographical perspective, the most important new records are those of Galium tenuissimum, G. parisiense, Spiranthes spiralis and Bifora radians in the Kiskunság, and that of Ornithogalum refr actum in the Praematricum. From secondary habitats, I report the occurrence of five fern species, one of which (Asplenium ceterach) was not previously reported from the Great Hungarian Plain. I also present recent localities for certain alien plant species, some of which have barely known occurrence or historical data even at the country level (Echium plantagineum, Persicaria orientalis, Periploca graeca), and some of which are poorly known for the Danube-Tisza Interfluve (e.g., Lepidium densiflorum, L. virginicum, Geranium purpureum, Taeniatherum caput-medusae, Humulus scandens). The paper also describes the occurrence of several species for which there are no previous records from the region or microregion, only historical records are available, or data are scarce (Alcea biennis, Arabis glabra, Arctium minus, Chenopodium botrys, Ch. murale, Herniaria incana, Melilotus dentatus, Potentilla inclinata, Reseda luteola, Vicia pannonica subsp. striata, Vulpia myuros etc.). New records for several aquatic plant species (e.g., Najas marina, Lemna gibba, Wolffia arrhiza) are also provided. [ABSTRACT FROM AUTHOR]

In the second half of the 20th century the River Sajó was one of the most polluted Hungarian rivers because of industrial activity. As a result of the improvement of water quality since 1990, the fish fauna of the river has changed for the better. In our survey we studied the fish fauna of tributaries of the River Sajó. Altogether 2120 individuals of 21 species were captured in 10 streams along the River Sajó in autumn 2015. Conservation and ecological assessment based on fish communities was performed using previous publications about fish fauna of the River Sajó. Our results suggest a correlation between the quality of fish communities in tributaries and those in River Sajó being an overlapping species composition in tributaries and in the main river. Our observation indicates that the tributaries may serve as a valuable fish habitat of fish species of Sajó River Basin. [ABSTRACT FROM AUTHOR]