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The Lesser Kestrel (Falco naumanni, Fleischer, 1818) strongly attached to agro-environmental landscapes, showing high preferences towards extensively managed wheat crops and extensively grazed or otherwise maintained pastures. The colonies of that species are often nesting in urban areas usually surrounded by agricultural fields or open uncultivated grasslands, securing food resources. This defines the species as a typical representative of farmland birds, whose main foraging and breeding habitats in Bulgaria fall into two main types of ecosystems - agroecosystems and grassland ecosystems, and its breeding habitats cover urban ecosystems. The aim of the present study is to assess the potential ecosystem services provide by Lesser Kestrel after recovering the species as a breeder in Bulgaria by Green Balkans NGO. MAES Ecosystem classification and data from the largest colony of the species in the country, located within SPA Sakar, part of the ecological network NATURA 2000 used. As a result, two major ecosystem services provided by the species: the provision of regulating ecosystem services by suppressing arthropods, reptiles and rodents populations and cultural ecosystem services through opportunities of ecotourism, environmental education, birdwatching were identify. Because of the critically endangered status of the Lesser Kestrel in Bulgaria, the species further contributes to the protection of habitats and thus, to the ecosystem services they provide. [ABSTRACT FROM AUTHOR]

For the period 2019-2021, three fish species of the family Cobitidae, caught from the upper section of the Danube River in Bulgaria, were subjected to ecologohelminthological investigation. Four specimens of Cobitis elongata Heckel & Kner, 1858 (two specimens from Kudelin biotope and two from Koshava biotope); six specimens of spined loach (Cobitis taenia Linnaeus, 1758) (from Koshava biotope) and one specimen of Sabanejewia bulgarica Drensky, 1928 (from Kudelin biotope) are objects of research. The trematode Asymphylodora tincae (Modeer, 1790) Lühe, 1909 was reported for the first time as a helminth of S. bulgarica. The nematode Pseudocapillaria tomentosa (Dujardin, 1845) Moravec, 1987 was reported for the first time as a helminth of C. elongat?. Kudelin and Koshava biotopes are new habitats for the found helminth species. During the helminthological examination of C. taenia, infection with helminths was not found. The study provides new data on helminth fauna and ecological indices (MI, MA, and P%) in the helminth communities of C. elongat? and S. bulgarica. [ABSTRACT FROM AUTHOR]