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Item

A case of partial albinism in the western jackdaw Coloeus monedula (Linnaeus, 1758)

(Plovdiv University Press "Paisii Hilendarski", 2025-09-09) Boev, Zlatozar

On 04.11.2024, an adult Western Jackdaw was observed in the centre of the city of Razgrad. The pure white feathers are located on the upper part of the wings, the lower part of the chest, on the neck and cheeks. Three unpublished cases of complete albinos in Coloeus monedula and Garrulus glandarius from the collection of the National Museum of Natural History in Sofia are also presented.

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Contribution to the knowledge of earthworm fauna (Lumbricidae) from Northern Bulgaria

(Plovdiv University Press "Paisii Hilendarski", 2025-09-05) Valchovski, Hristo; Tribis, Lev

Identifying the earthworm material recently collected from the Pre-Balkan hills resulted in the discovery of rare Allolobophora leoni (Michaelsen, 1891) and endemic species Cernosvitovia rebeli (Rosa, 1897). This is the first finding of Allolobophora leoni since 1965 and the northernmost finding of species Cernosvitovia rebeli from Bulgaria. The paper also provided information about the distribution and zoogeography of those taxa.

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Earthworm (Clitellata: Lumbricidae) records from Belasitsa Mts

(Plovdiv University Press "Paisii Hilendarski", 2025-09-05) Valchovski, Hristo; Kodzhabashev, Nikolay; Teofilova, Teodoroa

The research is a contribution to the knowledge of earthworm diversity in the Belasitsa Mountains (Bulgaria). This study presents new records of three taxa: Dendrobaena misirlioglui Csuzdi & Szederjesi, 2023, D. hortensis (Michaelsen, 1890), and Cernosvitovia rebeli (Rosa, 1897), which are registered for the first time from the Belasitsa Mts. The paper also provided information about the earthworm diversity of this region.

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Taxonomic Composition and Environmental Drivers of Phytoplankton in Earthen Fish Ponds (Bulgaria)

(Plovdiv University Press "Paisii Hilendarski", 2025-06-29) Dochin, Kostadin; Ivanova, Angelina; Ilieva, Lena; Iliev, Ivan

This study presents a comparative analysis of phytoplankton taxonomic structure and its relationship with environmental factors in earthen aquaculture ponds located in Plovdiv and Trivoditsi, Bulgaria, during the period May–September 2024. A total of 114 phytoplankton taxa were identified across six phyla, with Chlorophyta and Cyanoprokaryota dominating the bio-mass. The results showed a pronounced shift towards higher phytoplankton biomass (PhB up to 60.3 mg L⁻¹) and chlorophyll-a concentrations (up to 133 μg L⁻¹) in the Trivoditsi ponds, associated with blooms of green algae and cyanobacteria. For the first time, the invasive and potentially toxic species Raphidiopsis raciborskii was recorded in Bulgarian aquaculture ponds, contributing up to 15.5% of the phytoplankton biomass during bloom periods. Environmental parameters such as elevated ammonium, phosphate, and COD were positively correlated with increased PhB, chlorophyll-a, and total viable counts (TVC) of heterotrophic bacteria. Redundancy analysis (RDA) highlighted the influence of nutrient enrichment and organic load on the biological variables. The observed co-variation between PhB and TVC suggests the presence of a dynamic microbial loop, where intensive primary production supports hetero-trophic bacterial growth. These findings confirm the role of eutrophic conditions and nutrient availability in shaping phytoplankton and microbial communities in earthen ponds used for aquaculture. This study provides new insights into the ecological interactions in such systems, contributing to future strategies for water quality management and sustainable aquaculture practices.

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Seasonal characteristics of precipitation in the region of NAO Rozhen, Bulgaria, for the period 2023—2025

(Plovdiv University Press "Paisii Hilendarski", 2025-06-29) Paskaleva, Vesselina; Terziyski, Atanas; Kochev, Nikolay; Tenev, Stoyan; Petrov, Nikola

The article presents high-resolution observations of winter precipitation in the region surrounding the National Astronomical Observatory (NAO) Rozhen, Bulgaria, at an altitude of 1,730 meters above sea level, during the 2023–2025 period. Utilizing an array of advanced meteorological instruments, including the OTT Pluvio²L, Parsivel² disdrometer, WS100 radar sensor, and SHM31 snow depth sensor, we captured detailed in-situ data on precipitation type, intensity, and duration. The integrated sensor system enabled the classification and quantification of various precipitation events such as snow, rain, drizzle, and hail with minute-level resolution. The study features multiple precipitation-related variables, including total amount, intensity, and precipitation type. Seasonal and daily variations in precipitation behavior were documented, with snow dominating the winter period but often accompanied by mixed-phase events. The dataset supports enhanced understanding of precipitation dynamics in mountainous terrain and offers potential for model calibration, climate profiling, and natural air purification assessments. All data is provided in FAIR-compliant formats to support further research and environmental monitoring efforts.