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001-es BibID:	BIBFORM108001
035-os BibID:	(cikkazonosító)e110564 (WOS)000345250400010 (Scopus)84911480326
Első szerző:	Lendvai Ádám Zoltán (biológus)
Cím:	Experimental Food Restriction Reveals Individual Differences in Corticosterone Reaction Norms with No Oxidative Costs / Ádám Z. Lendvai, Jenny Q. Ouyang, Laura A. Schoenle, Vincent Fasanello, Mark F. Haussmann, Frances Bonier, Ignacio T. Moore
Dátum:	2014
ISSN:	1932-6203
Megjegyzések:	Highly plastic endocrine traits are thought to play a central role in allowing organisms to respond rapidly to environmental change. Yet, not all individuals display the same degree of plasticity in these traits, and the costs of this individual variation in plasticity are unknown. We studied individual differences in corticosterone levels under varying conditions to test whether there are consistent individual differences in (1) baseline corticosterone levels; (2) plasticity in the hormonal response to an ecologically relevant stressor (food restriction); and (3) whether individual differences in plasticity are related to fitness costs, as estimated by oxidative stress levels. We took 25 wild-caught house sparrows into captivity and assigned them to repeated food restricted and control treatments (60% and 110% of their daily food intake), such that each individual experienced both food restricted and control diets twice. We found significant individual variation in baseline corticosterone levels and stress responsiveness, even after controlling for changes in body mass. However, these individual differences in hormonal responsiveness were not related to measures of oxidative stress. These results have implications for how corticosterone levels may evolve in natural populations and raise questions about what we can conclude from phenotypic correlations between hormone levels and fitness measures.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Plos One. - 9 : 11 (2014), p. 1-10. -
További szerzők:	Ouyang, Jenny Q. Schoenle, Laura A. Fasanello, Vincent J. Haussmann, Mark F. Bonier, Frances Moore, Ignacio T.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM107996
035-os BibID:	(cikkazonosító)e0141194 (Wos)000364433100024 (Scopus)84955440104
Első szerző:	Lendvai Ádám Zoltán (biológus)
Cím:	Analysis of the Optimal Duration of Behavioral Observations Based on an Automated Continuous Monitoring System in Tree Swallows (Tachycineta bicolor): Is One Hour Good Enough? / Ádám Z. Lendvai, Çağlar Akçay, Jenny Q. Ouyang, Roslyn Dakin, Alice D. Domalik, Prianka S. St John, Mark Stanback, Ignacio T. Moore1, Frances Bonier
Dátum:	2015
ISSN:	1932-6203
Megjegyzések:	Studies of animal behavior often rely on human observation, which introduces a number of limitations on sampling. Recent developments in automated logging of behaviors make it possible to circumvent some of these problems. Once verified for efficacy and accuracy, these automated systems can be used to determine optimal sampling regimes for behavioral studies. Here, we used a radio-frequency identification (RFID) system to quantify parental effort in a bi-parental songbird species: the tree swallow (Tachycineta bicolor). We found that the accuracy of the RFID monitoring system was similar to that of video-recorded behavioral observations for quantifying parental visits. Using RFID monitoring, we also quantified the optimum duration of sampling periods for male and female parental effort by looking at the relationship between nest visit rates estimated from sampling periods with different durations and the total visit numbers for the day. The optimum sampling duration (the shortest observation time that explained the most variation in total daily visits per unit time) was 1h for both sexes. These results show that RFID and other automated technologies can be used to quantify behavior when human observation is constrained, and the information from these monitoring technologies can be useful for evaluating the efficacy of human observation methods.
Tárgyszavak:	Természettudományok Biológiai tudományok esettanulmány folyóiratcikk
Megjelenés:	Plos One. - 10 : 11 (2015), p. 1-11. -
További szerzők:	Akcay, Caglar Ouyang, Jenny Q. Dakin, Roslyn Domalik, Alice D. St John, Prianka S. Stanback, Mark Moore, Ignacio T. Bonier, Frances
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM104050
035-os BibID:	(cikkazonosító)e0209737 (WoS)000454952800025 (Scopus)85059455395
Első szerző:	Szép Tibor
Cím:	Older birds have better feathers: A longitudinal study on the long-distance migratory Sand Martin, Riparia riparia / Tibor Szép, János Dobránszky,Anders Pape Møller, Gareth Dyke, Ádám Z. Lendvai
Dátum:	2019
ISSN:	1932-6203
Megjegyzések:	Feather quality is of critical importance to long-distance migratory birds. Here, we report a series of analyses of a unique data set encompassing known-age individuals of the long-distance migratory Sand Martin (Riparia riparia). Sampling over 17 years along the Tisza River, eastern Hungary, has resulted in the recapture of numerous individuals enabling longitudinal and cross-sectional investigation of the role of adaptation to variable environmental conditions on feather morphology. We show that older individuals tend to possess better quality feathers, measured using bending stiffness, feather length and thickness as proxies. Bending stiffness and feather thickness do not change with individual age, in contrast with increases in feather length and declines in daily feather growth versus age of individual alongside moult duration. Individuals who live to older ages tend to have similar, or higher, feather growth rates and better feather quality than individuals captured at younger ages. Thus, on the basis of strong selection against individuals with slow feather growth, as seen in other species of swallows and martins, which causes a delay in moult completion, the results of this analysis highlight the potential cost of producing better quality feathers when this depends on moult duration. Feather length also does change during the lifetime of the individual and thus enabled us to further investigate influence of individual and environmental conditions during the moult. The results of this analysis provide important insights on the adaptive significance of these traits, and the potential use of physical characteristics in unravelling the reasons why long distance migratory bird populations are in global decline.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Plos One. - 14 : 1 (2019), p. 1-14. -
További szerzők:	Dobránszky János Møller, Anders P. Dyke, Gareth J. Lendvai Ádám Zoltán (1977-) (biológus)
Pályázati támogatás:	OTKA K69068 OTKA NKFI K 120348 Egyéb OTKA-113108 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM072322
035-os BibID:	(cikkazonosító)e0192701 (WOS)000424814300039 (Scopus)85042120858
Első szerző:	Vágási Csongor István
Cím:	Experimental increase in baseline corticosterone level reduces oxidative damage and enhances innate immune response / Csongor I. Vágási, Laura Pătraș, Péter L. Pap, Orsolya Vincze, Cosmin Mureșan, József Németh, Ádám Z. Lendvai
Dátum:	2018
ISSN:	1932-6203
Megjegyzések:	Glucocorticoid (GC) hormones are significant regulators of homeostasis. The physiological effects of GCs critically depend on the time of exposure (short vs. long) as well as on their circulating levels (baseline vs. stress-induced). Previous experiments, in which chronic and high elevation of GC levels was induced, indicate that GCs impair both the activity of the immune system and the oxidative balance. Nonetheless, our knowledge on how mildly elevated GC levels, a situation much more common in nature, might influence homeostasis is limited. Therefore, we studied whether an increase in GC level within the baseline range suppresses or enhances condition (body mass, hematocrit and coccidian infestation) and physiological state (humoral innate immune system activity and oxidative balance). We implanted captive house sparrows Passer domesticus with either 60 days release corticosterone (CORT) or control pellets. CORT-treated birds had elevated baseline CORT levels one week after the implantation, but following this CORT returned to its pre-treatment level and the experimental groups had similar CORT levels one and two months following the implantation. The mass of tail feathers grown during the initial phase of treatment was smaller in treated than in control birds. CORT implantation had a transient negative effect on body mass and hematocrit, but both of these traits resumed the pre-treatment values by one month post-treatment. CORT treatment lowered oxidative damage to lipids (malondialdehyde) and enhanced constitutive innate immunity at one week and one month post-implantation. Our findings suggest that a relatively short-term (i.e. few days) elevation of baseline CORT might have a positive and stimulatory effect on animal physiology.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk antioxidant glucocorticoid stress condition innate immunity oxidative stress
Megjelenés:	Plos One. - 13 : 2 (2018), p. 1-17. -
További szerzők:	Pătraş, Laura Pap Péter László (ökológus) Vincze Orsolya (1988-) (biológus) Mureşan, Cosmin Németh József (1954-) (vegyész, analitikus) Lendvai Ádám Zoltán (1977-) (biológus)
Pályázati támogatás:	EFOP-3.6.2-16-2017-00009 EFOP OTKA K 113108 OTKA EFOP-3.6.1-16-2016-00022 EFOP PD-76862 OTKA
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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