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22 →- MakaleAçık Erişim2026Scopus SJRQ4Climate-driven synchronization of honey bee flight activity and plant phenology in Türkiye: development of a Beekeeping Climate Suitability Index (BCSI)
Erdoğan, Yaşar; Erdoğan, Ümmügülsüm
Honey bees (Apis mellifera L.) provide essential pollination services that depend on the temporal synchronization between flight activity and plant flowering phenology, both strongly influenced by climatic conditions. However, this relationship remains insufficiently quantified at large spatial and temporal scales. In this study, we quantified climate-driven honey bee flight activity and its alignment with flowering phenology of major nectar plants in Türkiye using ERA5-Land data for the period 1981–2023. Suitable flight days were defined based on temperature (≥12°C) and precipitation (0 mm), and seasonal suitability was evaluated at a monthly scale. A composite Beekeeping Climate Suitability Index (BCSI) was developed by integrating flight activity, flowering overlap and nectar flow window. The number of suitable flight periods ranged between 4 and 7 months (mean ≈5.5), indicating substantial interannual variability. Flight flowering synchrony was low for early-spring species (23–35%) but reached 100% for summer species. BCSI values ranged from 0.44 to 1.00, capturing variability in climatic suitability for beekeeping. These findings demonstrate that climatic variability plays a decisive role in shaping bee plant interactions and provide a quantitative basis for climate-informed beekeeping management.
- MakaleAçık Erişim2026Scopus SJRQ1Chemical composition acaricidal activity and honeybee safety of essential oils from Origanum acutidens, Satureja hortensis, and Juniperus communis against Varroa destructor
Erdoğan, Yaşar
Varroa destructor is a destructive ectoparasite of honeybees (Apis mellifera). This study investigates the chemical composition and bioactivity of essential oils obtained from three medicinal plants (Origanum acutidens, Satureja hortensis, and Juniperus communis). The chemical components of the essential oils were determined by Gas Chromatography-Mass Spectrometry (GC-MS). These oils were evaluated for their acaricidal, repellent, and insecticidal activities against V. destructor, as well as their lethal effects against honeybee larvae. The results revealed that the essential oils of O. acutidens (LC50: 2.18, LC90: 6.07 µL/L) and S. hortensis (LC50: 1.79, LC90: 5.77 µL/L) exhibited strong acaricidal effects, while those of J. communis (LC50: 3.75, LC90: 4.16 µL/L) exhibited moderate activity. S. hortensis showed the highest repellent effect against V. destructor (ED50: 0.44, ED90: 1.25 µL/L), followed by O. acutidens (ED50: 0.58, ED90: 4.22 µL/L) and J. communis (ED50: 0.87, ED90: 46.3 µL/L). Furthermore, the larval mortality rates remained below 5% in all treatments, indicating negligible toxicity to honeybee larvae. Overall, this study highlights for the first time the comparative acaricidal and repellent efficacy of these three essential oils under identical experimental conditions, emphasising their potential as natural and environmentally friendly alternatives for controlling V. destructor. Further research is needed to optimise application methods and evaluate long-term effects under field conditions.
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İncele - MakaleYayıncıda açık erişim2026Scopus SJRQ3Effects of phenolic-standardized Crataegus orientalis flower extract on honey bee colony development and seasonal honey yield; [Efectos del extracto floral de Crataegus orientalis estandarizado en compuestos fenólicos sobre el desarrollo de colonias de abejas melíferas y el rendimiento estacional de miel]
Erdoğan, Yaşar; Erdoğan, Ümmügülsüm
Aim of study: The aim of this study was to evaluate the effects of a phenolic-standardized flower extract from Crataegus orientalis Pall. on honey bee colony development and end-of-season honey yield under field conditions, and to assess its lasting colony-level effects. Area of study: The study was conducted during the 2025 beekeeping season at the apiary of Bayburt University Beekeeping Application and Research Center, located in northeastern Türkiye. Material and methods: Twenty-four initially balanced honey bee (Apis mellifera L.) colonies were randomly assigned to four groups (n = 6): a control group receiving 1:1 sucrose:water syrup and three treatment groups receiving 50, 100, or 200 mg GAE L⁻¹ of phenolic-standardized Crataegus orientalis flower extract. Colonies were fed daily for 21 days in early spring and monitored at seven time points (T0–T6) from mid-May to late August. Colony development was assessed using brood area (cm²) and number of frames with bees, while hive-front dead bees were recorded as a safety indicator. Net honey yield was determined at the end of the season. Main results: Daily syrup consumption did not differ among groups (P > 0.05), whereas daily phenolic intake increased in a dose-dependent manner (P < 0.05). Brood area increased significantly with dose and was generally higher in the high-dose group than in the control group throughout the season (P < 0.001). No significant differences were observed among groups for seasonal averages of frames with bees or mortality index; however, a significant treatment × time interaction was detected for frames with bees. Net honey yield was significantly higher in the high-dose group compared to the control group (P < 0.01). Research highlights: Short-term early spring supplementation with phenolic-standardized Crataegus orientalis flower extract supported brood development without increasing adult bee mortality. This early developmental advantage resulted in a measurable improvement in end-of-season honey yield under field conditions.
- MakaleAçık Erişim2026Scopus SJRQ2Physicochemical properties, phytohormone profiles and quality assessment of honey from the Çoruh Valley of Türkiye
Tosun, Murat; Cengiz, Mahir Murat; Erdoğan, Yaşar; Turan, Metin
In this study, seventeen floral honey samples collected from Türkiye’s Çoruh Valley were examined and a total of 59 parameters were analyzed to evaluate their quality attributes. Accordingly, hydroxymethylfurfural (HMF), diastase activity, fructose, glucose, sucrose, total fructose + glucose (F + G), the fructose/glucose ratio (F/G), color and δ13C isotope values were determined together with amino acid profiles, organic acid composition, mineral contents, and phytohormone profiles. All chemical and biological data were evaluated using multivariate statistical approaches, including Principal Component Analysis (PCA), Pearson correlation analysis and Hierarchical Clustering Analysis (HCA), to characterize similarities and differences among the samples. The analytical results demonstrated that honeys from this region comply with established quality standards and exhibit natural purity, balanced chemical composition, and favorable nutritional properties. The detection of diverse phytohormone types and concentrations across the samples, as revealed by the analyses, indicates a rich biochemical signature originating from plant sources. This finding also highlights the functional properties, biological value, and nutritional significance of these honeys. Overall, the results confirm that the floral honeys obtained from Türkiye’s Çoruh Valley are high-quality products in terms of both chemical and biological properties.
- MakaleAçık Erişim2026Scopus SJRQ1Dietary chokeberry (Aronia melanocarpa) supplementation improves colony development, nutritional status, antioxidant defences, and honey production in honey bee colonies
Erdoğan, Yaşar; Erdoğan, Ümmügülsüm
This study evaluated the effects of chokeberry (Aronia melanocarpa) fruit powder as a functional dietary supplement for honey bee (Apis mellifera) colonies, focusing on colony development, antioxidant defences, nutritional status, behaviour, and honey yield under field conditions. A total of 48 colonies were randomly assigned to four feeding treatments (control, 2, 5, and 10 g L−1 chokeberry supplementation), with six colonies per treatment in each apiary (n = 6 per apiary; n = 12 per treatment). The experiment was conducted as a balanced field trial across two apiaries. Colonies were fed sucrose syrup supplemented with chokeberry powder for 21 days. Following the feeding period, colonies were transferred to two high-altitude summer apiaries where colony development, flight activity, defensive behaviour, antioxidant biomarkers, and end-of-season honey yield were evaluated. Results demonstrated that chokeberry supplementation significantly improved colony development, with significant dose effects on brood area and bee-covered frames (both p < 0.001). Flight activity also increased with supplementation dose (p < 0.001), whereas defensive behaviour was not affected. Total antioxidant capacity (TAC), superoxide dismutase (SOD), catalase (CAT) activity, and haemolymph total protein concentration all increased significantly with supplementation (all p < 0.001). End-of-season honey yield was significantly higher in supplemented colonies than in the control group (p < 0.001). Overall, these findings demonstrate that chokeberry fruit powder represents a promising functional dietary supplement capable of improving colony performance through the combined contribution of its nutritional composition and bioactive phytochemicals under practical field conditions.
- MakaleYalnız künye2026Scopus SJRQ2Effects of giant fennel (Ferula communis L.) on some performance traits in honey bees during supplementary feeding period
Çıvracı, Sadık; Yalçın, Sakine; Onbaşılar, Esin Ebru
This study was carried out to determine the effects of seeds and roots of giant fennel (Ferula communis L.) on some performance characteristics of Apis mellifera caucasia L. colonies. Equalized colonies were distributed with 4 colonies for each group. In the study, 5 groups were arranged, and only syrup was given to the control group. On the other hand, 0.1% and 0.2% levels of root and seed of giant fennel were added to the syrup in the experimental groups. Measurements were made at 21-day intervals in the experiment. At the end of the experiment, supplemental feeding by adding fennel seeds and roots to the syrup provided a statistically significant increase in the number of bee frames, hive weight, nectar flow weight gain, and honey yield. Although the use of seed and root at the levels of 0.1% and 0.2% did not make a difference in these parameters, the use of the 0.2% level of seed had a more positive effect than the level of 0.1%. Usage of giant fennel seed and root increased total antioxidant status, total oxidant status, and oxidative stress index in honey according to the control group. The total antioxidant status in honey was increased statistically with the usage of 0.1% fennel seed. As a result of this study, it was concluded that the brood production and honey yield in honey bees and the antioxidant status in honey can be increased with the use of fennel seed and root, especially at the level of 0.2%, in supplementary feeding.
- MakaleAçık Erişim2025Scopus SJRQ2Physicochemical properties, organic acid composition and free amino acid profiles in selected Cornus mas L. genotypes from the Çoruh Valley
ERDOĞAN, Ümmügülsüm; ERDOĞAN, Yaşar
Cornus mas L. (cornelian cherry) is a species widely used from traditional consumption to modern industrial applications due to its high nutritional content, richness in phenolic compounds, and functional food potential. This study aimed to comprehensively evaluate the physicochemical properties, organic acid composition, and free amino acid profiles of 15 cornelian cherry genotypes selected from the Çoruh Valley, one of Turkey's important biodiversity centers. Fruit samples were collected at full physiological maturity, and TSS, titratable acidity, pH, sugar composition, ascorbic acid, and tannin contents were analyzed using standard methods.Organic acids were determined by HPLC-UV, and free amino acids were determined by HPLC with OPA/FMOC derivatization. All measured traits differed significantly among genotypes (p < 0.05). Malic acid ranged from 38.12 to 251.34 mg/100 g, and total organic acids from 588.89 to 1038.15 mg/100 g. Free amino acid contents ranged from 71.34 to 93.14 mg/100 g, with the highest values in the G7 and G5 genotypes. This study demonstrates that the Çoruh Valley is an important hotspot of genetic diversity for cornelian cherry and contains genotype groups suitable for different uses. Overall, the findings provide a biochemical basis for selecting genotypes for breeding, nutritional applications, and industrial processing.
- MakaleYalnız künye2025Scopus SJRQ4EFFECT OF ELECTROMAGNETIC FIELD DERIVED FROM ELECTRIC FENCE SYSTEM ON SPERM ACTIVITIES OF HONEYBEES (Apis mellifera L.); [Elektrikli Çit Sistemi Tarafından Oluşturulan Elektromanyetik Alanın Bal Arılarının (Apis mellifera L.) Sperm Aktivitesine Etkisi]
Erdoğan, Yaşar
This study investigated the effects of electromagnetic fields (EMFs) from electric fence systems on physiological and reproductive parameters of male honeybees (Apis mellifera caucasica). The study was conducted between May and August 2024 at the Bayburt University Beekeeping Application and Research Center, with five experimental groups. Hives were positioned at varying distances (1–2.5 m) from the fence. The findings showed that the average body weight (245.4 mg), sexual maturity rate (58.56%), and sperm concentration (0.87 ± 0.04 × 10 ⁶/μL) of drones closest to the electric fence were significantly reduced (p < 0.05). The electric field effect was limited in groups at greater distances, with statistically insignificant differences in some parameters. No significant differences were found between groups in sperm volume. Results demonstrate that electric fields from fence systems suppress developmental processes and reproductive physiology of drones in a distance-dependent manner. Lower body weight, decreased sperm concentration, and proportion of mature males in colonies near the fence show electromagnetic stress is a significant risk for bee health. Future studies should examine the effects of electromagnetic fields at different frequencies and strengths on larval development, sperm morphology, oxidative stress markers, and gene expression profiles.
- MakaleAçık Erişim2023Could eumelanin molecule from Streptomyces parvus BSB49 strain be a potential anticancer agent for lung cancer?
Karakas, Ümıt; Bayram, Sinan; Kizil, Hamit Emre; Öztürk, Serdar
Melanins, which are divided into five different subgroups as eumelanin, pheomelanin, allomelanin, neuromelanin and pyomelanin, are a heterogeneous and amor- phous biopolymer family. Although melanin is produced in many different ways today, it is more practical, and more economical to produce melanin using bacterial strains. The eumelanin pigment, which is the subject of this study, was obtained using Streptomyces parvus BSB49 strain, and its antiproliferative effect at various concentrations against small cell (DMS-114) and non-small cell (H-460) lung cancer was determined. According to our results, the synthesized eumelanin molecule was statistically cytotoxic on non-small cell lung cancer cell line (H-460) at concentrations of 3.125 and 1.56 μg/mL after 24 hours of treatment (IC50=8 μg/mL) and only at a concentration of 3.125 μg/mL after 48 hours of treatment (IC50=8.4 μg/mL). In the small cell lung cancer cell line (DMS-114), no statistically cytotoxic concentration was detected (p<0.05).
- MakaleAçık Erişim2022Determination of Color and Odor Preferences of Honey Bees (Apis Mellifera L.)\r
Erdoğan, Yaşar; Yavuz, Kani
This study was carried out in the beekeeping research area of Bayburt University in order to\rdetermine the effect of odor and color on plant preference of honeybees in 2021. The experimental\rsetup was established at a distance of 200 meters from the apiary where 80 Caucasian bees (Apis\rmellifera caucasica) colonies are located. As a result of the study, the most preferred feeders were\rthe control group (pure sucrose syrup) (9.81 pieces), and the least preferred feeders were the rose-\rscent group (2.58). The effect of odor on honeybees' feed preferences varied according to months.\rConsidering the effect of months on honeybees' visits to their feeders, the most visited feeders were\rMelissa (6.8) in June, control (11.69) in July, and control (14.58) in August. The highest number of\rfeeder visits by honeybees was in August (9.24), and the lowest (2.89) in June. Considering the\rcolor preferences of honeybees, the most visited forage color was blue (5.98) and the least red was\r4.89. The effect of colors on the feed preferences of honeybees also varied according to the months.\rThe highest visitor bee average was found in the blue colored feeder (4.53) in June, the green\rcolored feeder (7.24) in July, and the yellow and blue colored feeders (7.29) in August.
Tam Kayıt
| Alan | Değer | Dil |
|---|---|---|
| dc.date.accessioned | 2026-10-29T17:14:21.360913642Z | |
| dc.date.available | 2026-10-29T17:14:21.360913642Z | |
| dc.identifier.uri | https://rdlopen.rawdatalibrary.net/r/bayburt/10202 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.title | Veterinerlik Bölümü | tr |
| dc.title | Department of Veterinary Studies | en |
| organization.identifier.code | bayburt-demirozu-veterinerlik | |
| organization.unitType | department | |
| rdl.unit.alias | \bveterinerlik bolumu\b | |
| rdl.unit.alias | \bdep\w* (of )?veterinary\b |