Összesen 3 találat.


001-es BibID:BIBFORM097704
Első szerző:Elek Z.
Cím:Call rate in Common Cuckoos does not predict body size and responses to conspecific playbacks / Elek Zoltán, Bán Miklós, Fülöp Attila, Marton Attila, Hauber Márk E., Moskát Csaba
ISSN:0021-8375 2193-7206
Megjegyzések:The brood parasitic Common Cuckoo Cuculus canorus is best known for its two-note "cu-coo" call which is almost continuously uttered by male during the breeding season and can be heard across long distances in the field. Although the informative value of the cuckoo call was intensively investigated recently, it is still not clear whether call characteristic(s) indicate any of the phenotypic traits of the respective vocalising individuals. To fill this gap, we studied whether the call rate of male cuckoos (i.e., the number of calls uttered per unit of time) provides information on their body size, which might be a relevant trait during intrasexual territorial conflicts. We captured free-living male cuckoos and measured their body size parameters (mass, wing, tail and tarsus lengths). Each subject was then radio-tagged, released, and its individual "cu-coo" calls were recorded soon after that in the field. The results showed that none of the body size parameters covaried statistically with the call rates of individual male Common Cuckoos. In addition, we experimentally tested whether the "cu-coo" call rates affect behavioural responses of cuckoos using playbacks of either a quicker or a slower paced call than the calls with natural rates. Cuckoos responded similarly to both types of experimental playback treatments by approaching the speaker with statistically similar levels of responses as when presented with calls at the natural rate. We conclude that male Common Cuckoos do not advertise reliable information acoustically regarding their body size, and so, cuckoo calls are neither useful to characterize cuckoos' phenotypic traits directly nor to indicate environmental quality indirectly.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Call rate
Body size
Territorial signalling
Megjelenés:Journal Of Ornithology. - 162 : 4 (2021), p. 1183-1192. -
További szerzők:Bán Miklós (1975-) (biológus) Fülöp Attila (1987-) (biológus) Marton Attila (1990-) (biológus) Hauber, Márk E. Moskát Csaba
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001-es BibID:BIBFORM058711
Első szerző:Mérő Thomas Oliver (ökológia)
Cím:Habitat management varying in space and time : the effects of grazing and fire management on marshland birds / Thomas Oliver Mérő, László Lontay, Szabolcs Lengyel
ISSN:0021-8375 2193-7206
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal of Ornithology. - 156 : 3 (2015), p. 579-590. -
További szerzők:Lontay László (1976-) (biológus) Lengyel Szabolcs (1971-) (biológus)
Pályázati támogatás:OTKA NNF 78887, NNF 85562, K 106133
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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)
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