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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
Internet cím:Szerző által megadott URL
DOI
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2.

001-es BibID:BIBFORM116536
035-os BibID:(WoS)001105138500002 (Scopus)85176771928
Első szerző:Rödel, Heiko G.
Cím:Age-specific effects of density and weather on body condition and birth rates in a large herbivore, the Przewalski's horse / Heiko G. Rödel, Benjamin Ibler, Katalin Ozogány, Viola Kerekes
Dátum:2023
ISSN:0029-8549
Megjegyzések:Reproduction in young females can show a particularly sensitive response to environmental challenges, although empirical support from individual-based long-term studies is scarce. Based on a 20-year data set from a free-roaming Przewalski's horse population (Equus ferus przewalskii), we studied effects of large-herbivore density (horses + cattle) and weather conditions experienced during different life stages on females' annual birth rates. Foaling probability was very low in 2-year-olds, reaching maximum values in 5 to 10-year-olds, followed by a decrease in older females indicating reproductive senescence. Mother's previous reproductive investment affected her current reproduction; young and old mothers (as opposed to middle-aged ones), which had nursed a foal for at least 60 days during the previous year, reproduced with a lower probability. Foaling probability and body condition of young females were lower when large-herbivore density was high. Reproduction was also influenced by interactive weather effects during different life stages. Low late-summer precipitation during the females' year of birth was associated with a pronounced decrease in foaling probability in response to harsh late-winter temperatures prior to the mating season. In turn, increased amounts of late-summer rain during this early age together with more late-summer rain during the females' current pregnancy led to an increased reproductive probability in 2-3-year-olds. These results were corroborated by the ameliorating effects of late-summer rain on body condition in such females. In conclusion, our findings highlight the interactive importance of weather conditions experienced during early life, and of density and weather during current pregnancy on foaling probability, particularly in young females.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Age-dependence
Equus ferus przewalskii
Foaling
Parturition
Precipitation
Reproduction
Senescence
Winter temperature
Megjelenés:Oecologia. - 203 : 3-4 (2023), p. 435-451. -
További szerzők:Ibler, Benjamin Ozogány Katalin (1982-) (biológiai fizikus) Kerekes Viola
Pályázati támogatás:FK 123880
Egyéb
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
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