Összesen 2 találat.


001-es BibID:BIBFORM097841
Első szerző:Mainwaring, Mark C.
Cím:Sex-specific contributions to nest building in birds / Mark C. Mainwaring, Jenő Nagy, Mark E. Hauber
Megjegyzések:The causes and consequences of interspecific variation in sex-specific contributions to animal parental care are relatively well understood during pregnancy or incubation and during offspring provisioning, but comparative patterns of sex-biased investment during nest-, den-, or other shelter-building have been almost completely overlooked. This is surprising because birthing shelters' protective properties have important fitness consequences for both parents and offspring. Here, we address this gap in our knowledge by testing predictions concerning sex-specific contributions to avian nest building in more than 500 species of Western Palearctic birds in relation to the time available to breed and sex-specific reproductive effort, while also examining correlates with nesting site and nest structure. Using multivariate phylogenetic comparative and path analysis approaches, we found that, opposite to what had been predicted, species in which females build nests alone have shorter breeding seasons and breed at higher latitudes. In addition, species in which females lay larger clutch sizes and incubate eggs alone are more likely to have nests built by females alone, again countering predictions that reproductive contributions are not traded-off between the sexes. Finally, however, sex-specific nest building contributions were predictably related to nest site and structure, as species in which females built nests alone were more likely to have open cup nests relative to enclosed, domed nests of species in which both parents build. Our study provides important new insights, and generates several new questions for experimental research into the adaptive dynamics of sex-specific contributions prior or at the onset of parental care.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
nest building
nest structure
offspring provisioning
parental care
Western Palearctic
Megjelenés:Behavioral Ecology. - 32 (2021), p. 1-11. -
További szerzők:Nagy Jenő (1989-) (biológus) Hauber, Márk E.
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001-es BibID:BIBFORM082239
Első szerző:Nagy Jenő (biológus)
Cím:Correlated evolution of nest and egg characteristics in birds / Jenő Nagy, Mark E.Hauber, Ian R.Hartley, Mark C. Mainwaring
Megjegyzések:Correlational selection is defined as selection for adaptive character combinations, and it therefore favours combinations of coevolved traits via phenotypic integration. Whereas the evolution of avian nestbuilding and egg-laying characteristics are well understood, their correlated dynamics remain overlooked. Here, we examined patterns of correlated evolution between nest, egg and clutch characteristics in 855 species of birds from 90 families, representing nearly 9% and 33% of avian species- and familylevel diversity. We show that the ancestral state of birds' nests was semi-open with nest sites having since become progressively more open over time. Furthermore, nest characteristics appear to have influenced egg-laying patterns in that while semi-open nests with variable clutch sizes were probably ancestral, clutch sizes have declined over evolutionary time in both open and closed nests. Ancestrally, avian eggs were also large, heavy and either elliptic or round, and there have been high transition rates from elliptic to round eggs in open nests and vice versa in closed nests. Ancestrally, both unpigmented (white) and pigmented (blueebrown) eggs were laid in open nests, although blueebrown eggs have transitioned more to white over time in open and closed nests, independently. We conclude that there has been a remarkable level of correlated evolution between the nest and egg characteristics of birds, which supports scenarios of correlational selection on both of these extended avian phenotypes.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
comparative analysis
correlated evolution
Megjelenés:Animal Behaviour. - 158 (2019), p. 211-225. -
További szerzők:Hauber, Márk E. Hartley, Ian R. Mainwaring, Mark C.
Pályázati támogatás:HJ Van Cleave Professorship
EMET No. NTP-EFÖ-P-15-A-0495
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Intézményi repozitóriumban (DEA) tárolt változat
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