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001-es BibID:	BIBFORM114811
035-os BibID:	(WoS)001060251500001 (Scopus)85170096928
Első szerző:	Lodjak, Jaani
Cím:	Short- and long-term effects of nutritional state on IGF-1 levels in nestlings of a wild passerine / Jaanis Lodjak, Jelle Boonekamp, Ádám Z. Lendvai, Simon Verhulst
Dátum:	2023
ISSN:	0029-8549
Megjegyzések:	Growth trajectories of young animals are intimately connected to their fitness prospects, but we have little knowledge of growth regulation mechanisms, particularly in the wild. Insulin-like growth factor 1 (IGF-1) is a central hormone in regulating resource allocation, with higher IGF-1 levels resulting in more growth. IGF-1 levels generally increase in conjunction with nutritional state, but whether IGF-1 levels are adjusted in response to current nutrient availability or to the nutrient availability integrated over a longer term is not well known. We tested for such effects by supplementary feeding the jackdaw (Corvus monedula) nestlings in experimentally reduced or enlarged broods with either water (control) or a food solution; these manipulations have long- and short-term effects on the nutritional state, respectively. Baseline plasma IGF-1 levels were higher in reduced broods. Food supplementation induced an increase in plasma IGF-1 levels measured one hour later, and this effect was significantly more substantial in nestlings in reduced broods. Changes in plasma IGF-1 levels increased with increased retention of the supplementary food, which was higher in reduced broods, explaining the stronger IGF-1 response. Thus, IGF-1 levels respond to short-term variations in the nutritional state, but this effect is amplified by longer-term variations in the nutritional state. We discuss our findings using a graphical model that integrates the results of the two treatments.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk IGF-1 táplálkozás madár
Megjelenés:	Oecologia. - 203 : 1-2 (2023), p. 27-35. -
További szerzők:	Boonekamp, Jelle Lendvai Ádám Zoltán (1977-) (biológus) Verhulst, Simon
Pályázati támogatás:	K139021 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM067141
Első szerző:	Pap Péter László (ökológus)
Cím:	Physiological pace of life: the link between constitutive immunity, developmental period, and metabolic rate in European birds / Péter László Pap, Csongor István Vágási, Orsolya Vincze, Gergely Osváth, Judit Veres-Szászka, Gábor Árpád Czirják
Dátum:	2015
ISSN:	0029-8549
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Oecologia 177 : 1 (2015), p. 147-158. -
További szerzők:	Vágási Csongor István Vincze Orsolya (1988-) (biológus) Osváth Gergely (1985-) (biológus) Veres-Szászka Judit Czirják Gábor Árpád
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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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
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