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001-es BibID:BIBFORM106954
035-os BibID:(Wos)000615948300006 (Scopus)85098499912
Első szerző:Kerekes Viola
Cím:Trends in demography, genetics, and social structure of Przewalski's horses in the Hortobagy National Park, Hungary over the last 22 years / Viola Kerekes, István Sándor, Dorina Nagy, Katalin Ozogány, Loránd Göczi, Benjamin Ibler, Lajos Széles, Zoltán Barta
Dátum:2021
ISSN:2351-9894
Megjegyzések:The world population of Przewalski`s horses has recovered from very few survivors, and is still categorized as ?Endangered" in the IUCN Red List of Threatened Species. For this reason, the maintenance of genetically valuable populations is highly important. The 3000 ha Pentezug Reserve in Hortobagy National Park, Hungary, was home to 270 Przewalski`s horses at the end of 2018, approximately 30% of the total European population. In this study, we show the main changes in demographic, genetic, and social characteristics of the population since the establishment of the reserve in 1997. The first years clearly demonstrated that the steppe ecosystem and the wetlands in this area were ideal for the population. We observed that the growing number of individuals affected the total number of harems, but not the average size of the harems. Remarkably, a new phenomenon, herd formation, also appeared. The number of foals per year increased for 17 years (the zenith was in 2014, N ? 60 per year) then started to decrease due to both non-human factors (e.g. delay in female fecundity and decreasing foaling rate) and human intervention (e.g. immunocontraception treatment). The total number of horses peaked in 2017 (N ? 328) and in 2018 decreased (N ? 276) due to decreasing foaling rate, exports, and a population crash. The inbreeding coefficient increased slightly after 2012, while gene diversity stabilized at a relatively high value. Today many individuals from this well-monitored population can be found in Russia and Mongolia. Collectively, understanding of the social structure and mechanisms of population self-control in Przewalski`s horses is improved by our observations. From a population management point of view, our study highlights the importance of human interventions for birth-control and interactions between Przewalski`s horse projects in different countries.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Equus ferus przewalskii
Conservation management
Harem
Home range
Birth control
Fertility control
Megjelenés:Global Ecology and Conservation. - 25 (2021), p. e01407. -
További szerzők:Sándor István Nagy Dorina Ozogány Katalin (1982-) (biológiai fizikus) Göczi Loránd (1993-) (PhD Hallgató) Ibler, Benjamin Széles Lajos (1971-) (molekuláris biológus) Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:NKFIH-1150-6/2019
Egyéb
FK 123880
Egyéb
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2.

001-es BibID:BIBFORM104008
035-os BibID:(Wos)000475671200005 (Scopus)85069899297
Első szerző:Kerekes Viola
Cím:Analysis of habitat use, activity, and body condition scores of Przewalski's horses in Hortobagy National Park, Hungary / Viola Kerekes, Katalin Ozogány, István Sándor, Zsolt Vegvari, Csilla Czető, Bettina Nyírő, Timea Szabados, Lajos Széles, Zoltán Barta
Dátum:2019
ISSN:2500-008X
Megjegyzések:A founder population of Przewalski's horses (Equus ferus przewalskii) was set free in a semi-reserve called Pentezug in the Hortobagy National Park (Hungary) in 1997. Beside the Przewalski's horses reconstructed aurochs (Bos taurus taurus) were bred as well in the 24.5-km2 large area. Both species reproduced successfully in this steppe reserve, which was once the homeland of their distant ancestors. The number of large grazers has grown so quickly that different strategies of population control had to be implemented for reconstructed aurochs and horses in 2007 and 2013, respectively. The activity, habitat use, and body condition of Przewalski's horses were monitored regularly throughout the 22 years. We detected seasonal changes in the activity of the horses but the proportions of the main activity types were similar in two distant time periods. In contrast, habitat use and body condition scores for the horses showed remarkable differences between early vs. late years of the project, implying that horses were forced to use non-preferable areas and their condition was worsened in parallel with the increased population density of the large grazers. During the cold spring in 2018, there was a massive loss of both horses and cattle. These observations suggest that limited food sources could lead to changes in habitat use and/or worse body condition and a greater death rate in extreme weather conditions. In summary, strict birth control measures must be implemented in dense Przewalski's horse populations, and the habitat use and body conditions must be monitored to balance the population size and carrying capacity of the areas.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Bos taurus taurus, carrying capacity, Equus ferus przewalskii, large grazers, population control, Pentezug Reserve, reconstructed aurochs, semi-reserve
Megjelenés:Nature Conservation Research. - 4 : Suppl.2 (2019), p. 31-40. -
További szerzők:Ozogány Katalin (1982-) (biológiai fizikus) Sándor István Végvári Zsolt (1969-) (biológus) Czető Csilla Nyírő Bettina Szabados Timea Széles Lajos (1971-) (molekuláris biológus) Barta Zoltán (1967-) (biológus, zoológus)
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3.

001-es BibID:BIBFORM114543
035-os BibID:(cikkazonosító)5096 (WoS)001063751200018 (Scopus)85169756508
Első szerző:Ozogány Katalin (biológiai fizikus)
Cím:Fine-scale collective movements reveal present, past and future dynamics of a multilevel society in Przewalski's horses / Ozogány, Katalin; Kerekes, Viola; Fülöp, Attila; Barta, Zoltán; Nagy, Máté
Dátum:2023
ISSN:2041-1723
Megjegyzések:Studying animal societies needs detailed observation of many individuals, but technological advances offer new opportunities in this field. Here, we present a state-of-the-art drone observation of a multilevel herd of Przewalski's horses, consisting of harems (one-male, multifemale groups). We track, in high spatio-temporal resolution, the movements of 238 individually identified horses on drone videos, and combine movement analyses with demographic data from two decades of population monitoring. Analysis of collective movements reveals how the structure of the herd's social network is related to kinship and familiarity of individuals. The network centrality of harems is related to their age and how long the harem stallions have kept harems previously. Harems of genetically related stallions are closer to each other in the network, and female exchange is more frequent between closer harems. High movement similarity of females from different harems predicts becoming harem mates in the future. Our results show that only a few minutes of fine-scale movement tracking combined with high throughput data driven analysis can reveal the structure of a society, reconstruct past group dynamics and predict future ones.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Nature Communications. - 14 : 1 (2023), p. 1-12. -
További szerzők:Kerekes Viola Fülöp Attila (1987-) (biológus) Barta Zoltán (1967-) (biológus, zoológus) Nagy Máté
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