http://hdl.handle.net/10506/793 2025-12-26T02:29:59Z http://hdl.handle.net/10506/2616 Title: New habitats of some species of orchids on the territory of the European ecological network Natura 2000 (Bulgaria) Authors: Boycheva, Petya; Ivanov, Dobri Abstract: We present new data on the distribution of five orchid species in the Batova Valley Protected Area BG 0000102, part of the European ecological network Natura 2000. Although these orchid species are not new to the floristic region of Northeastern Bulgaria, we report new habitats in Batova River Valley Protected Area. Three of the species are reported for the first time, for the other two species, this is the second report in the study area. All described orchid species are subject to protection by various national and international documents. 2024-05-13T00:00:00Z http://hdl.handle.net/10506/2615 Title: Algal diversity on the granite monument in front of the Faculty of Biology of Sofia University Authors: Ivanov, Kristian; Androv, Miroslav Abstract: The paper presents the results on the species composition of aeroterrestrial algae that developed on a granite monument in the urban environment in the central part of the Bulgarian capital town Sofia, situated in front of the Faculty of Biology of Sofia University “St. Kliment Ohridski”. After scraping the visible algal layers from both frontal (northern) and back (southern) side of the monument, samples were immediately processed by conventional light microscopy on non-permanent slides. The algal diversity comprised six species from the following four taxonomic phyla: Cyanoprokaryota, Chlorophyta, Streptophyta and Ochrophyta. The obtained samples are deposited in the Living Algal Collection of Sofia University (ACUS) for further proceeding and cultivation. 2024-05-13T00:00:00Z http://hdl.handle.net/10506/2614 Title: Species composition of Cyanoprokaryota in the summer phytoplankton of 55 lakes and reservoirs, sampled in Bulgaria in the years 2018, 2019, 2021 and 2023 Authors: Stoyneva-Gärtner, Maya; Uzunov, Blagoy; Gärtner, Georg; Androv, Miroslav; Ivanov, Kristian Abstract: The paper presents detailed results on cyanoprokaryote diversity in the summer phytoplankton of 55 lakes, small and large reservoirs sampled in Bulgaria in the frame of three joined projects related to algal blooms threat to human health and national security. The phytoplankton of twenty from these selected waterbodies was sampled for first time. In total, 185 species and one variety from 55 genera have been identified, 54 of which (29%) were novel for the country. The average contribution of cyanophytes to the phytoplankton per site was 8 species (or 44% of the total biodiversity), reaching in some sites 80%. According to the morphology, the recorded algae were distributed as follows: 83 coccal, 52 non-heterocytous filamentous and 51 heterocytous filamentous cyanoprokaryotes. Their average contribution to the phytoplankton diversity was estimated as 4 coccal, 2 non-heterocytous and 2 heterocytous species per site. Most of the cyanoprokaryote species (94, or 51%) were recorded only once, even in the case of wetlands and sites which have been repeatedly visited during all sampling campaigns. These 96 species embrace 39 coccal, 23 non-heteroctous and 32 heterocytous forms. No species was found in all studied waterbodies. The most widely spread species were Microcystis aeruginosa (19 records), Planktolyngbya limnetica (17 records), Aphanizomenon klebahnii (16 records), Microcystis wesenbergii (16 records), Aphanocapsa delicatissima (13 records), Cuspidothrix issatschenkoi (12 records), Coelomoron pusillum (11 records), Pseudanabaena limnetica (11 records), Anagnostidinema amphibium (10 records), Raphidiopsis raciborskii (10 records), Limnococcus limneticus (10 records), and separate cells of Microcystis as well (15 records). The record of the chytrid parasite Rhizosiphon anabaenae on separate trichomes of Sphaerospermopsis aphanizomenoides is described. 2024-05-13T00:00:00Z http://hdl.handle.net/10506/2613 Title: First data on the summer phytoplankton composition of 21 microreservoirs in Bulgaria and their floristic similarity Authors: Stoyneva-Gärtner, Maya; Uzunov, Blagoy; Androv, Miroslav; Ivanov, Kristian; Gärtner, Georg Abstract: The present paper provides first detailed data on the phytoplankton species composition collected during two summer campaigns (2019 and 2021) from 21 Bulgarian microreservoirs (<100 ha). By conventional light microscopy (LM) 414 algae from seven phyla were identified, among which Chlorophyta were the taxonomically richest group (143 taxa). The recorded high algal biodiversity corresponded to the average species contribution of 36 taxa per site. It was associated with a significant variability between the phytoplankton composition in different microreservoirs: the total number of species ranged from 9 to 97. The dominant/co-dominant and sub-dominant phytoplankton composition comprised 46 algae from six phyla, most of which were cyanoprokaryotes (26 species, out of which 17 dominated in 12 microreservoirs and 11 sub-dominated in seven microreservoirs). The floristic similarity estimated through Sørensen’s Correlation Index (SCI) was quite low (0-43%) corresponding to the high number of species (256, or 61%) found in a single waterbody. We strongly believe that the obtained results will stimulate further investigations of such small waterbodies as unexplored genetic reservoirs of algae. 2024-05-13T00:00:00Z