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Recent Submissions
On the species diversity of Psocodea (Insecta) of Mount Ismaros, North Greece
(Plovdiv University Press "Paisii Hilendarski", 2025-06-09) Georgiev, Dilian
This study presents the first data on the species diversity of barklice (Psocodea: Insecta) from Mount Ismaros in northern Greece. Fieldwork conducted between July 2020 and May 2025 resulted in the identification of 21 species from 12 families. Information on the copulation of Ectopsocus vachoni was also recorded, including season, time of day, and air temperature.
Cyprus Lizards: Patterns of distribution, endemic species habitat suitability modelling and conservation implications
(Plovdiv University Press "Paisii Hilendarski", 2025-05-31) Svana, Kaliana; Zotos, Savvas; Kiamos, Nikolaos; Lymberakis, Petros; Mylonas, Moisis
Considering the limited information on the distribution of Cyprus’ lizards, especially on endemic and endangered species, herein we explore their spatial patterns, with the aim of addressing this knowledge gap and contributing to informed conservation of the species as they face increasing pressure and threats. We recorded the eleven species present on the island, belonging to five families, of which two are endemic species (i.e. Laudakia cypriaca, Phoenicolacerta troodica) and four are endemic sub-species (i.e. Ablepharus budaki budaki, Acanthodactylus schreiberi schreiberi, Mediodactylus orientalis fitzingeri, Ophisops elegans schlueteri), including one listed as endangered by IUCN. We present new species occurrences and maps for all species, resulting from our extensive systematic survey in 2009. As a novelty, for the lizards and the island, we conducted species distribution modelling (SDM) for five endemic taxa. We used the maximum entropy algorithm (MaxEnt), with a combination of selected environmental predictors and user defined parameter settings. We provide potential habitat suitability maps and investigate the role of environmental predictors influencing the possible species’ distribution. We conclude that temperature, precipitation and vegetation have the most important influence in predicting habitat suitability. We propose five subregions, as a general pattern of differing habitat suitability for lizard species on the island. We discuss the added value and conservation implications of new knowledge and datasets we provide.
Lysosomal membrane stability assessment in wild and farmed mussels (Mytilus galloprovincialis Lamarck, 1819) as biomarkers for environmental stress: winter and spring results
(Plovdiv University Press "Paisii Hilendarski", 2025-05-28) Yancheva, Vesela; Stoyanova, Stela; Georgieva, Elenka; Todorova, Borislava; Antal, Laszlo; Samogyi, Dora; Uzochukwu, Ifeany Emmanuel; Nagy, Laszlo; Nyeste, Krisztian
This study evaluated lysosomal membrane stability using the Neutral Red Retention Time (NRRT) assay in hemocytes of Mytilus galloprovincialis from wild and farmed populations, as a biomarker for environmental stress. Mussels were sampled during winter and spring to assess seasonal variability. NRRT values showed a significant reduction in both populations across both seasons, indicating compromised lysosomal integrity and exposure to environmental stressors. However, the wild mussels exhibited consistently lower NRRT values compared to the farmed individuals, suggesting a higher level of stress. The question of why is yet to be answered.
Going Against the Flow: Notes on the re-colonisation of the Eurasian Beaver Castor fiber Linnaeus, 1758 in Northern Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2025-05-23) Bradley, Ian; Deleva, Stanimira
The Eurasian beaver (Castor fiber Linnaeus, 1758) was once wide-ranging across Northern Europe and Asia (Lavrov 1981). However, anthropogenic factors such as the intensive hunting for their fur, meat, and oils, along with significant habitat loss, have caused a drastic decline in their population over the last 300 years. This decline seemed irreversible until recent observations have shown promising signs of their return. Recently, the beaver was observed to return to Bulgaria, on the Danube River and its tributaries (Kodzhabashev et al. 2021). Observations in the country's interior were limited (Kodzhabashev, 2022, Kodzhbashev et al., 2023). Here we report the recent observation of this species in a new location - the Rositsa River, a tributary of the Yantra River.
They are heading south – new data from the distribution of the Eurasian beaver (Castor fiber) in Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2025-05-18) Marinova, Pavlina; Chernikov, Chavdar; Petkov, Nasko; Nedyalkov, Nikolay; Natchev, Nikolay
We report on a case of a wild specimen of Eurasian beaver (Castor fiber) that was detected south of the city of Razgrad (North East Bulgaria). To date, this is the southernmost area on the River Beli Lom, where the newly established Bulgarian beaver population has been registered. One young adult female specimen was rescued from a shaft in the spring of 2025. The specimen was palpated and inspected via X-ray for sexing, and full blood tests were performed. The female beaver was in general good condition. The river section, where the animal was captured, was observed in detail for signs of habitation of beavers and a number of gnawed trees were found. We recorded both newly impacted stems, as well as much older tooth marks (probably one or more years back in time). The investigated spot represents a bio-corridor for the beavers, as more gnawed trees were detected further south on the stream of Beli Lom River. We propose that the Bulgarian beaver population may reach the watershed of Kamchia River and in the near future, the beavers may cross the lower Eastern Balkan ridges and will expand into southern Bulgaria.