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    Characterizing the Helminth Community of the Mountain Gazelle (Gazella gazella Pallas, 1766) Through DNA Metabarcoding
    (Springer Science and Business Media Deutschland GmbH, 2025) Karaer, Mina Cansu; Karataş, Büşra; Madak, Elif; Sönmez, Hande İrem; Keskin, Emre; Sarımehmetoğlu, Hıfsı Oğuz; Kankılıç, Tolga; Tavşanoğlu, Çağatay
    Understanding parasite diversity in wild and captive animal populations is vital for their individual health and ecosystem dynamics. The helminth community in mountain gazelles (Gazella gazella Pallas, 1766), particularly in the isolated northernmost population in Türkiye, remains poorly understood, posing challenges for conservation. This study aimed to identify and compare the diversity of helminths in captive and free-ranging mountain gazelles in Hatay, Türkiye, while assessing potential zoonotic risks. Methods: We collected a total of 188 fresh fecal samples from both captive and free-ranging populations. The samples were analyzed using DNA metabarcoding to assess helminth species and their species diversity across seasons. Results: Our findings revealed eight helminth taxa in Gazella gazella, including six intestinal and two lung nematodes, with four of these species previously unreported in Türkiye. We also found seasonal differences in helminth composition and abundance. Conclusions: The identification of these helminth taxa highlights the value of advanced molecular techniques in uncovering parasite diversity in ungulates. Seasonal differences in helminth composition and abundance, and the biological characteristics of the detected helminth species align with the climatic parameters of the seasons in which they were identified.
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    Microplastic-associated biofilms in a river catchment: Diversity, public health impact, and ecosystem risks
    (Elsevier, 2025) Çelik, Işılay; Fırat, Müge; Çırak, Tamer; Başaran Kankılıç, Gökben; Dalgıç, Açelya; Ürker, Okan; Keskin, Emre; Tavşanoğlu, Ülkü Nihan
    Microplastics (MPs) serve as vectors for microbial colonization and biofilm formation, posing risks to aquatic environments and public health. This study investigated the seasonal dynamics of biofilm-forming microorganisms in the Melen River catchment - a vital water source for the cosmopolitan city of İstanbul - using an environmental DNA (e-DNA) approach, which analyzes genetic material present in the environment to detect and study organisms. Polyethylene (PE) and polypropylene (PP) were the most prevalent polymers year-round, supporting the attachment of bacterial genera such as Acinetobacter, Pseudomonas, Flavobacterium, Paludibacter, and Undibacterium. A total of 70,366 and 83,327 genera were identified from water and MPs samples, respectively. The presence of pathogens such as Acinetobacter and Flavobacterium on MPs underscores significant threats to public health and aquatic food webs. Functional predictions made using PICRUSt2, a bioinformatics tool that infers metabolic pathways from 16S rRNA gene sequences, suggested that biofilm-forming bacteria on plastic surfaces may be involved in fermentation, vitamin biosynthesis, nucleoside and nucleotide degradation, and secondary metabolite degradation. These findings provide crucial insights into the ecological and health risks associated with MPs, emphasizing the role of these particles in harboring pathogens, influencing biofilm formation, and contributing to plastic degradation. This study highlights the urgent need to address MPs contamination in freshwater ecosystems to mitigate its environmental and public health risks within the framework of the 'One Health' approach.