Összesen 3 találat.


001-es BibID:BIBFORM077160
Első szerző:Nagy Jenő (biológus)
Cím:Phylogeny, migration and life history: filling the gaps in the origin and biogeography of the Turdus thrushes / Nagy Jenő, Végvári Zsolt, Varga Zoltán
ISSN:0021-8375 2193-7206
Megjegyzések:Although the biogeographic history of thrushes (Turdidae) has been extensively studied, a concise discussion of this topic is still lacking. Therefore, in this study we aimed to investigate: (1) the evolutionary origin of the migratory behaviour of the Turdus thrushes in a biogeographic context including (2) trans-Atlantic dispersal events, (3) possible colonization routes into the Nearctic, and (4) relationships among life history traits, ecological factors, and migratory strategies within the most comprehensive taxon set of 72 Turdus thrushes to date. We estimated the ancestral ranges of the studied species, primarily by comparing main biogeographic models (dispersal-vicariance, dispersal-extinction-cladogenesis, BayArea models), and performed phylogenetic generalized least squares analyses to identify relationships among distribution patterns, diet, body measurements, clutch size, and migratory behaviour. We found that the most probable ancestral regions for all Turdus species were located in the East Palearctic realm, followed by early colonization of the western Palearctic and Africa, and that several trans-Atlantic movements occurred between 11 and 4 million years ago, which is earlier than previously thought. Migration emerged as an ancestral behaviour of the genus Turdus, and differences in clutch size and main food types were significant between migratory and non-migratory species. Correlated evolution was found between migration and along-latitudinal mobility, main food type, and the shift in main food type between the seasons. We conclude that along-latitudinal movements may have evolved earlier, simultaneously with the radiation of the Turdus thrushes, followed by the appearance of meridional migration, associated with orographic and climatic changes. The increased clutch sizes observed in migratory species and documented here for thrushes could serve as an important mechanism to compensate for losses due to mortality during migration.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
clutch size
comparative phylogeny
Foraging strategies
migratory behaviour
Megjelenés:Journal of Ornithology. - 160 (2019), p. 1-15. -
További szerzők:Végvári Zsolt (1969-) (biológus) Varga Zoltán (1939-) (professor emeritus, evolúcióbiológus, zoológus)
Internet cím:Szerző által megadott URL
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001-es BibID:BIBFORM067599
Első szerző:Nagy Jenő (biológus)
Cím:Life history traits, bio-climate and migratory systems of accipitrid birds of prey (Aves: Accipitriformes) / Jenő Nagy, Zsolt Végvári, Zoltán Varga
Megjegyzések:Although migration is a widespread phenomenon across a range of taxa, the evolution of migratory behaviour remains insufficiently understood. Therefore, the aim of this study was to examine the relationships between migratory behaviour and life history traits of diurnal birds of prey (Accipitriformes) in a phylogenetic context and also to investigate the bioclimatic suitability of geographical ranges for migratory raptors. We performed phylogenetic generalized least square analysis, using a previously published phylogenetic tree of 179 accipitrid raptors, to identify relationships among distribution patterns, diet, hunting strategies, body measurements, clutch size, and migratory behaviour. Bioclimatic data were employed into computer learning maximum entropy modelling (Maxent) to specify differences between climatic conditions on breeding and wintering grounds. Clutch size and hunting strategies have been proved to be the most important variables in shaping distribution areas, and also the geographic dissimilarities may mask important relationships between life history traits and migratory behaviours. However, this result supports the need for distinctions among the three major migratory routes in raptors. Indeed, the West Palearctic-Afrotropical and the North-South American migratory systems are fundamentally different from the East Palearctic-Indomalayan system, owing to the presence versus absence of ecological barriers. This suggests that the migratory behaviours differ among the three main migratory routes for these species. Future studies could uncover the causes of differences among the three main flyways in more detail.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
clutch size
comparative phylogenetic methods
ecology barriers
hunting strategies
maximum entropy modelling
Megjelenés:Biological Journal of the Linnean Society. - 121 : 1 (2017), p. 63-71. -
További szerzők:Végvári Zsolt (1969-) (biológus) Varga Zoltán (1939-) (professor emeritus, evolúcióbiológus, zoológus)
Pályázati támogatás:NTP-EFÖ-P-15-A-0495
Internet cím:Szerző által megadott URL
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001-es BibID:BIBFORM083947
035-os BibID:(WoS)000519572600004 (Scopus)85084204290
Első szerző:Varga Zoltán (professor emeritus, evolúcióbiológus, zoológus)
Cím:Contribution to the taxonomy and phylogeny of the genus Polia Ochsenheimer, 1816 (Noctuidae, Noctuinae, Hadenini): Species groups and pairs in the Holarctic subgenus Polia s. str. / Varga Zoltán, Ronkay Gábor, Nagy Jenő, Ronkay László
Megjegyzések:We review the phylogenetic and biogeographical connections of the Holarctic subgenus Polia, re-considering the diagnoses of the species groups based on the external morphology and the characterisation of the male and female genitalia, as well. We produced trees based on genital morphological characters. A preliminary CO1 consensus tree was also constructed which generally supports the morphologically outlined species groups. The plesiomorphic abdominal brush organ was observed to become lost in different species groups independently. The asymmetrisation of the tufts of bristles on the saccular extensions represents one of the most important traits of the genus. These are weakly differentiated, and the shape is nearly symmetrical in supposedly plesiomorphic character states. The most differentiated asymmetrical saccular processes were found in P. serratilinea and, parallel, also in the species of the Holarctic P. nebulosa group. Holarctic connections are present in most Arctic-Boreal species and certain sister species and/or species groups in temperate taxa (i.e. in the P. bombycina and the P. nebulosa species groups), with subsequent speciation in the Nearctic. It means that Trans-Beringian migrations should have occurred at least three times in the geographical history of Polia, from which the trans-migration of the basally split P. nebulosa group was the most ancient.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény hazai lapban
consensus tree
genital morphology
character status
sister species
Megjelenés:Acta Zoologica Academiae Scientiarum Hungaricae. - 66 : 1 (2020), p. 35-67. -
További szerzők:Ronkay Gábor Nagy Jenő (1989-) (biológus) Ronkay László (1955-) (biológus)
Pályázati támogatás:OTKA-116694
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat
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