Anabaena bergii Ostenf. [f. minor (Kisselev) Kossinsk.] (Cyanoprokaryota): The first record in Serbia, its taxonomic status, and that of the genus Anabaena Bory ex Born. & Flah.

Within the framework of a detailed survey of the algal community in salt marshes of the Vojvodina Province (Northern Serbia), we rather unexpectedly found the blue-green alga Anabaena bergii Ostenf. [forma minor (Kisselev) Kossinsk.] in water samples from Slatina Pond near Opovo. Our finding represents its first record in Serbia. The present paper gives general characteristics of this alga and of the habitat in which it was found. Based on analysis of a large number of works dealing with characteristics and the taxonomic status of the genus Anabaena, the species A. bergii, and its forma minor, it is concluded that there are numerous problems in taxonomy of the given genus, with no consensus among researchers. In light of the available data, the authors retain the name of the species A. bergii, but accept forma minor with some reserve

Biofilm forming cyanobacteria, algae and fungi on two historic monuments in Belgrade, Serbia

Biofilm on the sandstone substrata of the bridge 'Brankov most' and on the granite substrata of the 'Monument of the Unknown Hero' contains a complex consortia of cyanobacteria, algae, and fungi. Coccoid and filamentous cyanobacteria, green algae and diatoms make up the photosynthetic part of the biofilm while hyphal fragments, chlamydospores, fruiting bodies and spores take part as fungal components. These structures make a dense layer by intertwining and overlapping the stone surface. Five cyanobacterial, 11 algal and 23 fungal taxa were found. The interaction of the biofilm's constituents results in the bioweathering of the stone substrata through mechanical penetration, acid corrosion and the production of secondary mycogenic biominerals.

Diatoms on the carapace of European pond turtle (Emys orbicularis L.) in Vojvodina

Epibiotic diatoms inhabiting the carapace of European pond turtle (Emys orbicularis Linnaeus, 1758) are examined between May and July 2017 from three locations in Vojvodina (Serbia): Special nature reserve „Deliblatska Peščara“, Natural monument „Ivankovačka ada“ and Special nature reserve „Gornje podunavlje“. Our objective was to compare the diatom flora on a single turtle species across part of its range. Diatoms were removed by brushing from the carapaces, preserved in 4% formalin and identified under Carl Zeiss AxioImager.M1 microscope after preparing permanent slides with Naphrax medium. The diverse diatom assemblages were recorded. A total of 116 diatom taxa from 32 genera were found on the carapace of European pond turtle. The highest diversity in epibiotic diatom community was recorded at SNP „Deliblatska Peščara“ and NM „Ivankovačka ada“ (85 and 81 taxa, respectively). Only 6 diatom taxa (Nitzschia denticula, N. fonticola, Fragilaria ulna, Cymbella parva, C. perparva and Cyclotella sp.) were found on all three localities. Of these species, Cymbella perparva i Nitzschia denticula were occurred on the greatest number of turtles. In contrast, 67 diatom taxa occurred only on a single locality. Diatom richness and abundance were variable both among and within localities. The most numerous were erect (Cymbella spp., Gomphonema spp.) and motile (Nitzschia spp., Navicula spp.) forms.7th Balkan Botanical Congress, Book of abstracts, Novi Sad, Serbia, 10-14 September 201

The first record of the genus Decussata (Patrick) Lange-Bertalot (Bacillariophyta) in Serbia – description, distribution and ecology of the rare species D. hexagona (Torka) Lange-Bertalot

The aim of this paper is to present the distribution of Decussata hexagona, a new species in diatom flora of Serbia. Seventy-two diatom samples were collected from six localities along the Vrla and Rasina Rivers during 2011 and 2012. Decussata hexagona was recorded with single specimens or low relative abundance (0.3%) from epilithic communities in seven samples from the Vrla River and in one sample from the Rasina River. It was recorded in unusual epilithic habitats of running neutral to low-alkaline waters with low ion content

Desmid flora of fishpond Horgoš (Northern Serbia)

Fishpond Horgoš is situated in the north of Serbia, at the altitude of 75 m a.s.l, next to the Hungarian border. It was created due to long-term peat exploitation. There is no data about earlier algological research of fishpond Horgoš. The algological samples from fishpond Horgoš were collected in April, June, August and October 2008. All samples were fixed with formaldehyde to a final concentration of about 4% shortly after sampling. They were observed with a Carl Zeiss Axio Imager, M1 microscope and digital camera AxioCam MRc5 with AxioVision 4.8. software. The physicochemical analyses of water were performed at the Institute of Public Health of Serbia “Dr Milan Jovanović-Batut”, by standard analytical methods. The water temperature varies within the range of 13–22 °C, pH: 7–8; conductivity: 500–720 μS/cm; dissolved oxygen: 4.5–10.6 mg/l; BOD: 4.3–93 mg/l. On the basis the relevant literature (Lenzenweger 1996, 2003, Coesel & Meesters 2007) 28 desmid taxa were identified. Among 5 genera of desmids in all the most diverse was Closterium (18 taxa). During this research we identified 4 taxa from genera Cosmarium and Staurastrum, and 1-1 taxa from genera Staurodesmus and Teilingia. The species Closterium aciculare T. West, Cosmarium phaseolus Brébisson ex Ralfs and Staurastrum polymorphum Brébisson in Ralfs were the most quantitative abundant. The new species for Serbian desmids flora is Closterium nordstedtii Chodat. Fishpond Horgoš is characterized by desmid taxa, which prefer neutral to alkaline habitats. Results of statistical analysis using desmid as indicator showed that fishpond Horgoš is meso-eutrophic habitat.11th International Conference „Advances in research on the flora and vegetation of the Carpato-Pannonian region”, Budapest, 12–14 February 201

Diatoms of the genus Gomphonema Ehrenberg fromthe peat bog at Pešter plateau

Diatoms are large and diverse group of single-celled algae and are distributed throughout the world in nearly all types of aquatic systems. The main purpose of this study was to collect records on the floristics and characteristics of the assemblages of the peat bog at Pešter plateau inhabiting diatoms. Peat bogs are very important as significant relict habitats and have unique character not only in Serbia but in Europe as well. One of the permanent componenets of the biota of peat bogs are diatoms. The material used in the present study was collected from peat bog at Pešter plateau in June and September 2008, May 2009 and August 2011 from three localities. Various types of diatom communities including epiphytes, benthos and plankton were studied. The results of a floristic analyses were focused on taxa representing the genus Gomphonema Ehrenberg. Taxa belonging to the genus Gomphonema were very frequently recorded diatom in the observed material. Among 250 records 22 belong to this genus. Some of them are widespread in Serbia, but five are new to the Serbian diatom flora. All reported taxa are documented by LM micrographs. Brief notes on their morphological characters and dimensions of frustule, distribution and ecology are provided.18th Symposium for Biology Students in Europe, Alexandroupoli, 23.07.2015

Prvi nalaz roda Haslea Simonsen u Srbiji i novi taksoni silikatnih algi za floru države u ekstremnim i jedinstvenim staništima Vojvodine

Salt habitats are extreme and unique environments found from Austria through Hungary to the Vojvodina Province in Serbia. In our study, we investigated eight saline habitats (channeled salt marshes, moist salt meadows and saline ponds), from which we collectedplankton, epipelic and epiphytic diatoms. Seventeen diatom taxa new for the Serbian diatom flora were recorded. In addition, the genus Haslea, with one species (H. spicula), was recorded for the first time in Serbia. The identified taxa were sporadic or rare in the samples.Alkalna slana jezera, bare i močvare su ekstremna i jedinstvena staništa rasprostranjena u Austriji, Mađarskoj i Srbiji (Vojvodina). Istraživanje je obuhvatilo osam slanih staništa različitog tipa: kanalizovane slatine, zabarena slana staništa i slane bare. Uzorci obuhvataju različite zajednice silikatnih algi: plankton, bentos i epifite. Utvrđeno je prisustvo 17 taksona silikatnih algi po prvi put zabeleženih na teritoriji Srbije, a među njima prvi put i rod Haslea Simonsen sa jednom vrstom, H. spicula. Identifikovani taksoni su retki i sporadično nalaženi u uzorcima

Epiphytic diatoms from genus Navicula (Suvi Do, Pešte plateau, Serbia)

Rad sadrži podatke o sastavu epifitskih silikatnih algi roda Navicula (sensu stricto i sensu lato) sa lokaliteta Suvi Do (Pešterska visoravan, Srbija). Uzorci su sakupljani u julu i septembru 2008. godine i u maju 2009. godine ceđenjem mahovina Calliergon giganteum [(Schimp.) Kindb.], kao i struganjem epifita sa površine mahovina. U laboratoriji algološki uzorci su tretirani standardnom metodom sa koncentrovanom sumpornom kiselinom i kalijum permanganatom, a potom su napravljeni trajni preparati silikatnih algi. Pregledom preparata identifikovano je 14 taksona epifitskih silikatnih algi roda Navicula. U okviru roda Navicula sensu stricto identifikovano je 8 taksona. Analize su pokazale i prisustvo taksona iz rodova Placoneis, Cavinula i Sellaphora (rodovi u okviru Navicula sensu lato). Ovo su prvi podaci o rasprostranjenju silikatnih algi na Pešterskoj visoravni. Rezultati ovog rada uključuju i 4 nova taksona za floru silikatnih algi Srbije.The paper includes data for the composition of epiphytic diatoms of the genus Navicula (sensu stricto and sensu lato) from the site Suvi Do (Pester plateau, Serbian). Samples were collected in July and September 2008. year and in May 2009. squeezing the moss Calliergon giganteum [(Schimp.) Kindb.], and epiphytes by scraping the surface of moss. In the laboratory, samples were treated in standard method with concentrated sulfuric acid and potassium permanganate, and then were made permanent preparations of diatoms. A review of preparations identified 14 taxa of epiphytic diatoms genus Navicula. Within the genus Navicula sensu stricto 8 taxa were identified. Analysis showed the presence of taxa of the genera Placoneis, Cavinula and Sellaphora (in the genera Navicula sensu lato). These are the first data on the distribution of diatoms in the Pester plateau. The results of this study include 4 new taxa for diatoms flora of Serbia.Perućac, Serbia, 04-06.06.201

Algal Diversity Along the Serbian Stretch of the Sava River

Phytoplankton analysis is an essential part in water quality monitoring and predicting changes in aquatic ecosystems. In this study we investigated structure and diversity of algal communities along the Serbian stretch of the Sava River. We detected 109 species in four sampling localities (Bosut, Sremska Mitrovica, Jarak and Makiš). Species richness increases from Bosut to Jarak. However, a sudden decrease of species richness was recorded in the Makiš locality, probably due to increased pollution. Divisive numerical classification separates species with relatively narrow distribution (that are grouped in three clusters) from more common species (that form four clusters). Correspondence analysis clearly separates upper-stream sites (Bosut and Sremska Mitrovica) from down-stream sites Jarak and Makiš.Water Research and Management (2016), 6(2): 27-3

Ecological status of the Raška River evaluated by epiphytic diatom community

Bentosne silikatne alge koriste se kao bioindikatori i smatraju se korisnim u proceni ekološkog statusa voda. Uzorci epifitske zajednice silikatnih algi reke Raške sakupljeni su tokom pet sezona (2011. i 2012. godine), sa po 5 lokaliteta. Cilj ovog rada je određivanje vrednosti 17 dijatomnih indeksa radi procene ekološkog statusa vode reke Raške. Dobijene vrednosti dijatomnih indeksa ukazuju da je ekološki status vode reke Raške dobar do veoma dobar, sa umerenom do povišenom koncentracijom nutrijenata, beza većih varijacija u vrednostima između lokaliteta.Benthic diatoms have been regularly used as ecological indicators and considered to be valuable in water quality assessment and monitoring. Epiphytic samples were collected from five points during five seasons (2011-2012). The objective of this paper is to evaluate applicability of 17 diatom based indices used worldwide for water quality assessment. The water of the Raška River can be characterized as good to very good quality with moderate to elevated concentration of nutrients