CCL

Összesen 7 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM107991
035-os BibID:(cikkazonosító)20190733 (WOS)000507289800002 (Scopus)85077885225
Első szerző:Angelier, Frédéric
Cím:When do older birds better resist stress? A study of the corticosterone stress response in snow petrels / Frédéric Angelier, Olivier Chastel, Adam Z. Lendvai, Charline Parenteau, Henri Weimerskirch, John C. Wingfield
Dátum:2020
ISSN:1744-9561
Megjegyzések:Life-history theory predicts that, to optimize their fitness, individuals should increase their reproductive effort as their residual reproductive value decreases. Accordingly, several studies have shown that individuals downregulate their glucocorticoid stress response (a proxy of reproductive investment in vertebrates) as they age, and as the subsequent reproductive value decreases. However, and surprisingly, results appear inconsistent, suggesting that the environmental context or the individual state may affect the relationship between age and reproductive effort. Here, we tested for the first time this hypothesis, and more specifically, whether this attenuation of the corticosterone stress response with advancing age depends on the energetic status of individuals. We compared the influence of age on the corticosterone stress response between fasting and non-fasting breeding snow petrels (Pagodroma nivea), an extremely long-lived bird. As expected, we found that the corticosterone stress response was attenuated in old petrels, but only when they were not fasting. Interestingly, this pattern was not apparent in fasting petrels, suggesting that old birds downregulate their corticosterone stress response and increase their parental investment only when they are in good body condition. At the ultimate level, old individuals may maintain a strong corticosterone stress response when fasting because the survival costs of increased stress resistance and parental effort might then outweigh their reproductive benefits.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Biology Letters. - 16 : 1 (2020), p. 1-4. -
További szerzők:Chastel, Olivier Lendvai Ádám Zoltán (1977-) (biológus) Parenteau, Charline Weimerskirch, Henri Wingfield, John C.
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM107997
035-os BibID:(Wos)000352630300013 (Scopus)84926419812
Első szerző:Brischoux, Francois
Cím:Marine lifestyle is associated with higher baseline corticosterone levels in birds / Francois Brischoux, Ádám Z. Lendvai, Ádám Z., Veronika Bókony, Olivier Chastel, Frédéric Angelier
Dátum:2015
ISSN:0024-4066
Megjegyzések:Because seawater is hyperosmotic relative to body fluids of most vertebrates, marine lifestyle is expected to strongly influence the physiology of marine tetrapods. Regulating the salt content of body fluids is energetically costly; and osmoregulatory organs may not totally overcome salt load and/or water loss. As a consequence, marine lifestyle should influence physiological systems involved in the maintenance of the physiological balance (homeostasis), in the mobilisation of energetic resources (e.g., to fuel salt excretion), or in the acquisition of resources (e.g., fresh water). Corticosterone (CORT) is one such ?generalist` mediator that is linked with energy expenditure, physiological stress and that activates osmoregulation. As a consequence, CORT is expected to be overall higher in marine tetrapods but this hypothesis has never been tested. Using comparative analyses, we tested this hypothesis in birds, a lineage for which available data on baseline CORT allow comparing marine versus terrestrial species, and species with or without salt glands. We found that marine species (and species with salt glands) display significantly higher baseline CORT during the wintering (but not the breeding) stage. Although salt glands` presence was tightly linked to phylogeny, our results suggest that marine lifestyle may impose a strong, but overlooked, influence on the allostasis-related physiology of marine birds. Such habitat-related variation in physiology is a major phenomenon to explore owing to its general implications for understanding the physiological basis of evolutionary transitions in habitat use.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
mineralocorticoid
osmoregulation
phylogenetic comparative analysis
salinity
salt glands
Megjelenés:Biological Journal Of The Linnean Society. - 115 : 1 (2015), p. 154-161. -
További szerzők:Lendvai Ádám Zoltán (1977-) (biológus) Bókony Veronika (alkalmazott zoológus) Chastel, Olivier Angelier, Frédéric
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

3.

001-es BibID:BIBFORM081449
035-os BibID:(cikkazonosító)20150272 (PMID)26179799
Első szerző:Lendvai Ádám Zoltán (biológus)
Cím:Within-individual plasticity explains age-related decrease in stress response in a short-lived bird / Ádám Z. Lendvai, Mathieu Giraudeau, Veronika Bókony, Frédéric Angelier, Olivier Chastel
Dátum:2015
ISSN:1744-9561
Megjegyzések:A crucial problem for every organism is how to allocate energy between competing life-history components. The optimal allocation decision is often state-dependent and mediated by hormones. Here, we investigated how age, a major state variable affects individuals' hormonal response to a standardized stressor: a trait that may reflect allocation between self-maintenance and reproduction. We caught free-living house sparrows and measured their hormonal (corticosterone) response to capture stress in consecutive years. Using a long-term ringing dataset, we determined the age of the birds, and we partitioned the variation into within- and among-individual age components to investigate the effects of plasticity versus selection or gene flow, respectively, on the stress response. We found large among-individual variation in the birds' hormone profiles, but overall, birds responded less strongly to capture stress as they grew older. These results suggest that stress responsiveness is a plastic trait that may vary within individuals in an adaptive manner, and natural selection may act on the reaction norms producing optimal phenotypic response in the actual environment and life-history stage.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
corticosterone
stress response
plasticity
Megjelenés:Biology Letters. - 11 : 7 (2015), p. 1-4. -
További szerzők:Giraudeau, Mathieu Bókony Veronika (alkalmazott zoológus) Angelier, Frédéric Chastel, Olivier
Pályázati támogatás:OTKA PD76862
OTKA
OTKA K113108
OTKA
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

4.

001-es BibID:BIBFORM018785
Első szerző:Lendvai Ádám Zoltán (biológus)
Cím:Conflict over parental care in house sparrows : do females use a negotiation rule? / Ádám Z. Lendvai, Zoltán Barta, Olivier Chastel
Dátum:2009
ISSN:1045-2249
Megjegyzések:Ho do parents resolve their conflict over parental care? The classical "sealed-bid" model of biparental care suggested that parents use a fixed best effort given the partner's effort. Alternatively, parents may "negotiate" their actual effort until the efforts of both partners settle down to limiting values, but in this case, the resulting efforts will not be the best responses to one another. Consequently, under the best response scenario, the response of 1 parent to the removal of its mate can be predicted from the response to a reduction in its partner's effort, whereas the "negotiation" model predicts that such an extrapolation will underestimate the effort of a parent caring alone. We tested this prediction in free-living house sparrows (Passer domesticus). We experimentally manipulated the males' parental care as follows: males' care in group 1) was reduced by using a capture-handling-release stress protocol, 2) stopped by removing the male, and 3) left as control. In response to these manipulations, control females kept their feeding rate constant, whereas male-stressed-released females showed a moderate increase of feeding rate. When this response was extrapolated to zero male effort, their effort was still significantly lower than the observed effort of male-removed females. These results suggest that females may use the negotiation rule to determine their actual parental effort.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
biparental care
handicapping
mate removal
Passer domesticus
sexual conflict.
Megjelenés:Behavioral Ecology. - 20 : 3 (2009), p. 651-656. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus) Chastel, Olivier
Internet cím:DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

5.

001-es BibID:BIBFORM107994
035-os BibID:(WOS)000373920800011 (Scopus)84961990888
Első szerző:Tartu, Sabrina
Cím:Mercury exposure, stress and prolactin secretion in an Arctic seabird: an experimental study / Sabrina Tartu, Paco Bustamante, Frédéric Angelier, Ádám Z. Lendvai, Børge Moe, Pierre Blevin, Claus Bech, Geir W. Gabrielsen, Jan Ove Bustnes, Olivier Chastel
Dátum:2015
ISSN:0269-8463 1365-2435
Megjegyzések:Life-history theory predicts that long-lived organisms should reduce parental effort under inclement environmental conditions in order to favour long-term survival. Seabirds are long-lived top predators often exposed to environmental endocrine disrupting chemicals such as mercury (Hg). Hg-contaminated birds show disrupted parental behaviour. Avian parental behaviour is governed by two key hormones in birds: corticosterone (CORT, a glucocorticoid hormone) and prolactin (PRL, a pituitary hormone involved in parental care). Any disruption of these hormones may alter the ability of an individual to adjust parental behaviour to environmental conditions. The first aim of this study was to describe the relationships between blood Hg concentrations, plasma PRL and reproductive performance in Arctic black-legged kittiwakes (Rissa tridactyla). We a found negative relationship between plasma initial PRL and blood Hg concentrations in males. Moreover, Hg concentration was negatively related to breeding success in chick-rearing males. Secondly, to study the effect of a chronic increase in CORT levels on the Hg-PRL relationship, we experimentally increased stress with CORT pellet implantation. We predicted that Hg and CORT would act synergistically on PRL and an increase in CORT concentration would steepen the Hg-PRL relationship. However, adding CORT did not steepen the Hg-PRL relationship. Hatching success was significantly lower in CORT-implanted males than in controls, and breeding success was not reduced in CORT-implanted male kittiwakes with high levels of blood Hg. Our results suggest that Hg may impair reproductive performance through a disruption of PRL secretion. Contrary to our prediction, Hg and CORT did not act synergistically and the underlying mechanisms associating CORT and Hg with PRL might be more complex than a single interaction between two factors.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Functional Ecology. - 30 : 4 (2015), p. 596-604. -
További szerzők:Bustamante, Paco Angelier, Frédéric Lendvai Ádám Zoltán (1977-) (biológus) Moe, Børge Blévin, Pierre Bech, Claus Gabrielsen, Geir Wing Bustnes, Jan Ove Chastel, Olivier
Pályázati támogatás:K-113108
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

6.

001-es BibID:BIBFORM107998
035-os BibID:(Wos)000358754100017 (Scopus)84939415736
Első szerző:Tartu, Sabrina
Cím:Increased adrenal responsiveness and delayed hatching date in relation to polychlorinated biphenyl exposure in Arctic-breeding black-legged kittiwakes (Rissa tridactyla) / Sabrina Tartu, Ádám Z. Lendvai, Pierre Blévin, Dorte Herzke, Paco Bustamante, Børge Moe, Geir Wing Gabrielsen, Jan Ove Bustnes, Olivier Chastel
Dátum:2015
ISSN:0016-6480
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Corticosterone
ACTH
Dexamethasone
Adrenal gland
PCBs
Reproduction
Megjelenés:General And Comparative Endocrinology. - 219 (2015), p. 165-172. -
További szerzők:Lendvai Ádám Zoltán (1977-) (biológus) Blévin, Pierre Herzke, Dorte Bustamante, Paco Moe, Børge Gabrielsen, Geir Wing Bustnes, Jan Ove Chastel, Olivier
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

7.

001-es BibID:BIBFORM108002
035-os BibID:(WoS)000337618100014 (Scopus)84902551677
Első szerző:Westneat, David F.
Cím:Multiple aspects of plasticity in clutch size vary among populations of a globally distributed songbird / David F. Westneat, Veronika Bokony, Terry Burke, Olivier Chastel, Henrik Jensen, Thomas Kvalnes, Adám Z. Lendvai, Andras Liker, Douglas Mock, Julia Schroeder, P. L. Schwagmeyer, Gabriele Sorci, Ian R. K. Stewart
Dátum:2014
ISSN:0021-8790
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Journal Of Animal Ecology. - 83 : 4 (2014), p. 876-887. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Burke, Terry Chastel, Olivier Jensen, Henrik Kvalnes, Thomas Lendvai Ádám Zoltán (1977-) (biológus) Liker András Mock, Douglas Schroeder, Julia Schwagmeyer, P. L. Sorci, Gabriele Stewart, Ian R. K.
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1