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Overwinter survival of hibernators is directly influenced by the fat reserves accumulated during the active season. The European ground squirrel, Spermophilus citellus, an endangered flagship species of the open grasslands of central and southeastern Europe, is no exception. Considering anthropogenic changes affecting its habitats in northern Serbia, we studied the species’ feeding habits by subjecting its feces to microhistological examination. In addition to identifying plant remains in the feces, we examined the vegetation of the four study sites located inside a local mosaic of steppe and saline pastures. Our findings indicate that these remaining European ground-squirrel sites are diverse and stable grasslands covered by native flora that represents a complete dietary base for the species. The diet is dominated by a small number of plant species, specifically Achillea millefolium, legumes and grasses, with sporadic contributions from a number of other species. The diet of S. citellus also differs by location and season in that grasses dominate during the early season, while A. millefolium takes precedence later in the year. This dietary information is essential for the development of future species and habitat management strategies. In light of the predicted impact of climate change on grasslands in northern Serbia, our findings will be instrumental for translocations and conservation actions in the future.

Background: Despite abundance of small mammals in Serbia, there is no information on their role in the epidemiology of tick-borne diseases (TBDs). This retrospective study aimed to identify different tick-borne pathogens (TBPs) in small mammals in Serbia collected during 2011. Materials and Methods: A total of 179 small mammals were collected from seven different localities in Serbia. The five localities belong to the capital city of Serbia—Belgrade: recreational areas—Ada Ciganlija, Titov gaj, and Košutnjak as well as mountainous suburban areas used for hiking—Avala and Kosmaj. The locality Veliko Gradište is a tourist place in northeastern Serbia, whereas the locality Milošev Do is a remote area in western Serbia with minor human impact on the environment. Results: The results of the presented retrospective study are the first findings of Rickettsia helvetica, Rickettsia monacensis, Neoehrlichia mikurensis, Borrelia afzelii, Borrelia miyamotoi, Babesia microti, Hepatozoon canis, and Coxiella burnetii in small mammals in Serbia. The presence of R. helvetica was confirmed in two Apodemus flavicollis, the presence of one of the following pathogens, R. monacensis, B. afzelii, H. canis, Ba. microti, and N. mikurensis was confirmed in one A. flavicollis each, whereas the presence of B. miyamotoi was confirmed in one Apodemus agrarius. Coinfection with B. afzelii and Ba. microti was confirmed in one A. flavicollis. DNA of C. burnetii was detected in 3 of 18 pools. Conclusions: The results confirm that detected pathogens circulate in the sylvatic cycle in Serbia and point to small mammals as potential reservoir hosts for the detected TBPs. Further large-scale studies on contemporary samples are needed to clarify the exact role of particular small mammal species in the epidemiology of TBDs caused by the detected pathogens. [ABSTRACT FROM AUTHOR]

Wild canids are recognized as important reservoir hosts for several vector-borne pathogens and are a good sentinel species for epidemiological surveillance. Identifying the reservoir hosts for particular zoonotic pathogens in a specific area enables the implementation of adequate measures in order to prevent the occurrence of zoonotic diseases in humans and domestic animals. The present review aims to summarize the role of wild canids in the epidemiology of tick-borne zoonoses in Serbia based on previously published papers and to discuss the available data from an epidemiological point of view. The results of previously published studies indicate that wild canids are potential reservoir hosts for several zoonotic tick-borne pathogens in Serbia, and hosts for several tick species which are proven competent vectors. Based on molecular studies conducted so far, the presence of Anaplasma phagocytophilum, was confirmed in jackals while the presence of Candidatus Neoehrlichia micurensis (FU98), Borrelia burgdorferi sensu stricto, Borrelia garinii, and Borrelia lusitaniae was proven by PCR in analyzed red foxes. There is a need for continuous epidemiological monitoring of diseases caused by pathogens previously confirmed in wild canids. Also, further research is needed to reveal the role of other wild and domestic animals in the epidemiology of tick-borne zoonoses in Serbia.

Understanding the spatial and temporal effects of variable environmental conditions on demographic characteristics is important in order to stop the decline of endangered-species populations. To capture interactions between a species and its environment, in this work the demographic traits of the European ground squirrel (EGS), Spermophilus citellus, were modeled as a function of agricultural landscape structure. The habitat suitability index was determined for 20 localities within the study area based on habitat use, management and type. After mapping the habitat patch occupancy in the field, crop cover maps, the average normalized difference vegetation index (NDVI) and automated water extraction index (AWEI) were obtained from satellite images covering the period 2013-2015. This data was used to develop population-level generalized linear models (GLMs) and individual-level conditional mixed-effects models (GLMMs) in R package Ime4, focusing on the key demographic traits of the EGS. The land composition and patch carrying capacity (PCC) are the key determinants of the endangered EGS population size, while system productivity is the main factor influencing individuals’ body condition after monitoring for variations across sampling years and age classes. The proposed landscape structural models show that human activities and abiotic factors shape the demographic rates of the EGS. Thus, to conserve threatened species, an appropriate focus on the spatial adaptation strategies should be employed. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III 43002: Biosensing Technologies and Global System for Long-Term Research and Integrated Management of Ecosystems]

Human activities such as deforestation, urbanization, and environmental pollution lead to a reduction in the spatial boundary between wild animals, domestic animals and humans. These activities increase the risk for the emergence of pathogens from the sylvatic cycle in the population of domestic animals and humans. Foxes are recognized as potential reservoirs for a number of bacterial pathogens of medical and public health concern. The aim of the present study was to investigate the prevalence and spatial distribution of bacterial tick-borne pathogens from the Anaplasmataceae family, Borrelia burgdorferi sensu lato (s.l.), Rickettsia spp., Coxiella burnetii, Francisella tularensis, Bartonella spp., in the red fox population from Serbia and to discuss the obtained results from the epidemiological point of view. Legally hunted red foxes (Vulpes vulpes) from 14 localities in Serbia were included in the study and spleen samples from 129 animals were tested with conventional PCR assays for the presence of bacterial tick-borne pathogens. DNA of Candidatus Neoehrlichia sp. (FU98), Borrelia burgdorferi sensu stricto, Borrelia lusitaniae, and Borrelia garinii was detected in 6 (4.7%), 1 (0.8%), 2 (1.6%) and 1 (0.8%) animals, respectively. Co-infection by Candidatus Neoehrlichia sp. (FU98) and B. garinii was detected in one animal. All samples were negative for other tested bacterial tick-borne pathogens. The results of the present study indicate the potential role of foxes in natural cycles of Candidatus Neoehrlichia sp. (FU98) and causative agents of Lyme borreliosis in the investigated areas. Further research is required to elucidate the role of foxes in the epidemiology of these and other tick-borne zoonotic pathogens in the Republic of Serbia.

The Eurasian beaver (Castor fiber) represents an extraordinary example of demographic recovery after centuries of severe hunting and extirpation. Reintroduction programs and legal protection have triggered the recolonisation of Europe, with rapid expansion of beaver populations in the last 25 years. In northern Italy, the species reappeared in 2018 after a 450-years absence, due to natural spreading of individuals from neighbouring countries. Since 2021, the presence of beavers has been reported in several areas of central Italy, probably following unofficial releases. Here, we employed mitochondrial DNA markers, mainly from non-invasive samples, to rule out the presence of the North American beaver (C. canadensis) and to characterise both the beavers from northern Italy and the new population from central Italy, assessing their genetic relationships with other European beavers. The analysis of 35 samples from Italy and other countries provided no evidence of the North American sister taxon and revealed four widely distributed mitochondrial haplotypes, which are discussed in the current framework of genetically mixed populations in Europe. In addition, this note reports genetic data from beavers in the Balkans, where no information has been available so far. [ABSTRACT FROM AUTHOR]

Fibromas present very frequent skin neoplasms in different species of wild game of the family Cervidae. Viral etiology of skin neoplasms was proven in certain species of wild game from this family, with the most frequent diagnoses being: fibromas, ossifying fibromas, fibrosarcomas, multiple neurofibromatosis, fibropapillomas, and papillomas. The diagnozed tumor in the roe deer had the histological characteristics of a polimorphous fibroblast, which is not the case with domestic animals. This finding can be considered as a characteristic of fibromas in animals of the family Cervidae. Solitary fibroma or multiple fibroma (fibromatosis) does not present a significant cause of deer deaths, but they cause concern among hunters who are in direct contact with them. Although fibromas do not lead to spoilage of game meat, they are esthetically repellent and people are reluctant to consume meat of such game.