DSpace 7
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Recent Submissions
Hidden diversity: noteworthy cortinarioid fungi (Cortinarius s. l.) from relict deciduous forests of Strandzha Mountain, Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-04-10) Assyov, Boris; Radoukova, Tzenka
The paper communicates interesting findings of cortinarioid fungi from relict deciduous forests in Strandzha Mt. (Bulgaria). Five species were revealed based on the above-ground collecting approach coupled with DNA-barcoding, targeting the nrITS region. These are Calonarius albertii, Ca. violaceipes, Cortinarius pseudocollinitus, Phlegmacium perpallens, and P. scaurocaninum. They are recorded for the first time from Bulgaria and represent their first molecularly supported findings in Southeastern Europe. The collections are illustrated and commented on, and brief morphological data are provided.
Evaluation of vegetation development in reclaimed sites using the NDVI
(Plovdiv University Press "Paisii Hilendarski", 2026-04-10) Petrov, Petar; Stefanova, Veneta
This study investigates the recovery processes in reclaimed sites (an old embankment from copper mining), which was reclaimed by various methods in 2010. For the purpose of this study, the maximum average values of the NDVI index for 2018-2021 were used. According to the results of the study, restoration processes are taking place in recultivated areas, and a tendency for the index to increase over time has been observed. The extent of the restorative process depends on the remedial measures that have been carried out. In the reclamation of sites disturbed by copper mining, liming has been found to be a key amelioration. The use of a NDVI index is a viable and reliable method of tracking site recovery and on-going soil formation process.
Recent wintertime observations of parrots from the genus Psittacula in Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-04-10) Petrov, Rusko; Dimitrova, Tsvetina
Climate change, characterized by rising winter temperatures and decreasing snow cover in Bulgaria, facilitates the adaptation and overwintering of exotic parrots of the genus Psittacula – the Alexandrine Parakeet (Psittacula eupatria) and the Rose-ringed Parakeet
(Psittacula krameri), which have been released from private collections or aviaries in urbanized and park environments. Observations since 2020 have registered a total of 8 Alexandrine Parakeets (Stara Zagora - 2, Veliko Tarnovo - 2, Valchi Dol - 2, Montana - 1, Plovdiv - 1) and 4 Rose-ringed Parakeets (2 in Varna and 2 in Stara Zagora). They utilize local tree species (e.g., plane trees, maples, hackberries, cherry laurels) for food, shelter, and roosting, similar to their invasive establishment in neighboring Europe. These changes highlight how milder winters allow tropical species to expand northward, potentially threatening the local fauna.
Nutritional composition of Abies x borisii-regis Mattf. cones from Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-04-08) Mladenova, Vasilena; Radoukova, Tzenka; Ivanova, Miroslava; Dospatliev, Lilko; Mladenov, Rumen; Stoyanov, Plamen; Mladenova, Tsvetelina; Todorov, Krasimir; Gyuzeleva, Donika
In this study, a proximate analysis and determination of the mineral content of Abies x borisii-regis cones from Bulgaria were carried out in connection with their potential use in the pharmaceutical industry. A. x borisii-regis cones showed to be rich in carbohydrates (79.06 g 100-1 g-1 dw), which were the most abundant macronutrients. The proteins in the A. x borisii-regis cones averaged 11.19 g 100-1 g-1 dw. The total energy content in the A. x borisii-regis cones is relatively high 1665.10 g-1 dw. The obtained data on the content of trace elements in the cones of A. x borisiiregis show the highest content of Fe (137.03 mg kg-1), followed by Mn (95.7 mg kg-1) and Zn (70.06 mg kg-1). The results of the proximate analysis of the cones of Tsar Boris fir, as well as the total content of trace elements, suggest the possibility of their direct use in pharmaceuticals and dietetics.
Мonthly fluctuations in litterfall in forest communities, part of the LTER-BG network
(Plovdiv University Press "Paisii Hilendarski", 2026-04-10) Dimitrova, Violeta; Damyanova, Sonya
Litterfall is a crucial component of forest ecosystems that links the tree canopy and soils. It is one of the indicators that must be monitored in the sites of the “Bulgarian Network for Long-Term Ecosystem Research - LTER BG”, which is a part of the “European Network for Long-Term Ecosystem Research”. The present study aimed to determine the production of total litterfall and its components (leaves, flowers and fruits, branches and seeds) and their monthly fluctuations at beech and spruce ecosystems situated at different altitudes. Litterfall quantities were studied in three sample plots in beech and spruce forests in the Balkan Mountains, located in sites of the LTER BG network. The monthly dynamics of deciduous forest show, as expected, the highest amounts of litterfall during the autumn months, with the leaf fraction dominating, followed by the cupulas and seeds. The average annual amount for beech forests was 506.5 g.m-2. In spruce forests, the annual amount was 623.28 g.m-2, with the largest percentage being needles, followed by cones and branches. The annual dynamics of litter in spruce forests show the presence of litter in all months of the year with a predominant fraction of needles. The difference in altitudes determines the monthly variations in litter fractions in beech forests. Further studies can continue with the study of the chemical composition of the litterfall in order to clarify the cycling of elements.