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1.

001-es BibID:BIBFORM070922
Első szerző:Bókony Veronika (alkalmazott zoológus)
Cím:Innovative females are more promiscuous in great tits (Parus major) / Bókony Veronika, Pipoly Ivett, Szabó Krisztián, Preiszner Bálint, Vincze Ernő, Papp Sándor, Seress Gábor, Hammer Tamás, Liker András
Dátum:2017
ISSN:1045-2249
Megjegyzések:Individual variation in the propensity to express innovative behaviors is increasingly recognized as ecologically and evolutionarysignificant. A growing number of studies show that more innovative individuals can realize higher breeding success, indicating thatinnovativeness may be important in mating decisions. Here we investigated whether male and female performance in innovative problem-solving tasks is linked to sexual selection via extra-pair mating behavior. We observed the problem-solving success of great tit(Parus major) pairs in 2 tasks at the nest, and related it to the occurrence of extra-pair paternity (EPP) in their broods. In a food-acquisitiontask, we found no difference in EPP among pairs in which the male solved, pairs in which the female solved, and unsuccessfulpairs. In an obstacle-removal task that was solved almost exclusively by females, EPP was more frequent in broods of solver femalesthan in broods of unsuccessful females. These results do not support the hypothesis that the social male's innovativeness influencesthe female's extra-pair mating behavior. Instead, they suggest that the female's infidelity covaries positively with her innovativeness.Furthermore, EPP was related to both parents' neophobia such that pairs of highly neophobic individuals were less likely to have EPPthan pairs that contained at least one individual with low neophobia. These findings indicate that promiscuity is associated with certainbehavioral phenotypes, suggesting that both innovativeness and novelty seeking may facilitate the investment into and/or the exposureto extra-pair mating attempts.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
extra-pair fertilization
great tit
innovative problem solving
novel object
personality
promiscuity.
Megjelenés:Behavioral Ecology 28 : 2 (2017), p. 579-588. -
További szerzők:Pipoly Ivett Szabó Krisztián (1975-) (zoológus) Preiszner Bálint Vincze Ernő Papp Sándor Seress Gábor Hammer Tamás Liker András
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2.

001-es BibID:BIBFORM070938
Első szerző:Liker András
Cím:Genetic relatedness in wintering groups of house sparrows (Passer domesticus) / Liker András, Bókony Veronika, Kulcsár Anna, Tóth Zoltán, Szabó Krisztián, Kaholek Balázs, Pénzes Zsolt
Dátum:2009
ISSN:0962-1083
Megjegyzések:Social behaviour of group-living animals is often influenced by the relatedness ofindividuals, thus understanding the genetic structure of groups is important for theinterpretation of costs and benefits of social interactions. In this study, we investigatedgenetic relatedness in feeding aggregations of free-living house sparrows (Passerdomesticus) during the nonbreeding season. This species is a frequent model system forstudies of social behaviour (e.g. aggression, social foraging), but we lack adequateinformation on the kin structure of sparrow flocks. During two winters, we ringed andobserved sparrows at feeding stations, and used resightings to identify stable flock-members and to calculate association indices between birds. We genotyped the birdsusing seven highly polymorphic microsatellite loci, and estimated pairwise relatednesscoefficients and relatedness categories (close kin vs. unrelated) by maximum likelihoodmethod. We found that most birds were unrelated to each other in the flocks (mean ? SErelatedness coefficient: 0.06 ? 0.002), although most individuals had at least a few closerelatives in their home flock (14.3 ? 0.6% of flock-mates). Pairwise association betweenindividuals was not significantly related to their genetic relatedness. Furthermore, therewas no difference between within-flock vs. between-flock relatedness, and birds hadsimilar proportions of close kin within and outside their home flock. Finally, relatednessamong members of different flocks was unrelated to the distance between their flocks.Thus, sparrow flocks were not characterized by association of relatives, nevertheless thepresence of some close kin may provide opportunity for kin-biased behaviours to evolve.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
association,
dispersal
feeding groups
house sparrow,
kinship
Megjelenés:Molecular Ecology 18 : 22 (2009), p. 4696-4706. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Kulcsár Anna Tóth Zoltán Szabó Krisztián (1975-) (zoológus) Kaholek Balázs Pénzes Zsolt
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3.

001-es BibID:BIBFORM070930
Első szerző:Pipoly Ivett
Cím:Effects of Extreme Weather on Reproductive Success in a Temperate-Breeding Songbird / Pipoly Ivett, Bókony Veronika, Seress Gábor, Szabó Krisztián, Liker András
Dátum:2013
ISSN:1932-6203
Megjegyzések:The frequency of extreme meteorological events such as heat waves and rainstorms is predicted to increase withclimate change. However, there is still little information about how extreme weather influences reproduction inanimals. It may not only affect breeding success but might also alter offspring sex ratio if males and females aredifferentially sensitive to meteorological conditions during development. We investigated the relationship betweenmeteorological conditions and reproductive success over 6 years in a house sparrow population in central Europe.We found that hatching success increased with the number of extremely hot days (daily maximum >31?C) anddecreased with the number of extremely cold days (<16?C) during incubation, although the latter effect held only forclutches with relatively short incubation periods. Fledging success was unrelated to weather variables. However, thefrequency of extremely hot days had a negative effect on fledglings' body mass and tarsus length, although both ofthese traits were positively related to average temperature. Additionally, fledglings' body mass increased with thelength of period without rainfall before fledging. Male to female ratio among fledglings did not differ from 1:1 and didnot vary with weather variables. The magnitude of the effects of extreme meteorological events was usually small,although in some cases comparable to those of ecologically relevant predictors of reproductive success. Our resultsindicate that meteorological conditions have complex effects on breeding success, as the effects of extreme weathercan differ between different aspects of reproduction and also from the effects of overall meteorological conditions.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
house sparrow, extreme weather conditions, reproductive success
Megjelenés:Plos One. - 8 : 11 (2013), p. e80033-[11]. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Seress Gábor Szabó Krisztián (1975-) (zoológus) Liker András
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4.

001-es BibID:BIBFORM065614
Első szerző:Szabó Krisztián (zoológus)
Cím:Adaptive Host-Abandonment of Ectoparasites Before Fledging? Within-Brood Distribution of Nest Mites in House Sparrow Broods / Krisztián Szabó, Anita Szalmás, András Liker, Zoltán Barta
Dátum:2008
ISSN:0022-3395
Megjegyzések:We studied the within-brood distribution of a haematophagous mite Pellonyssus reedi living on nestling house sparrows (Passer domesticus) near the time of fledging. We measured the natural level of infestation of individual nestlings, and determined the feeding efficiency of mites, by scoring their feeding status. Within-brood distribution of mite loads was unrelated to nestling body mass, tarsus length, or immunocompetence. These results did not support parasite preference for large or susceptible hosts. Mite feeding-efficiency was also unrelated to these nestling characteristics, confirming that large nestlings or nestlings with less-developed immunocompetence did not provide superior feeding conditions for mites. Therefore, our results do not support the hypothesis that within-brood distribution of avian ectoparasites is explained by the parasites' preferences for characteristics, such as large body size or low immunocompetence, that make nestlings suitable hosts. On the other hand, we found that mite loads were negatively correlated with nestling age and feather length, suggesting that nestlings closer to fledging harbored fewer mites then their less-developed nestmates. Furthermore, feather length had a stronger relationship with parasite distribution than did nestling age. We presume, therefore, that feather characteristics, i.e., length, may serve as a signal for mites to perceive the ready-to-fledge state of nestlings, inducing abandonment behavior. These results support another, largely neglected hypothesis, i.e., that the avoidance or abandonment of those nestlings that are close to fledging may also explain the parasites' distribution in a brood. This hypothesis is based on the argument that many nest-dwelling ectoparasites breed in the nest material and emerge only periodically to feed on nestlings. In such parasites, the ability to recognize and avoid mature fledglings can be adaptive because this may help the parasites to avoid their removal from the nest so they can continue to reproduce by feeding on unfledged chicks of the current or later broods. Our results suggest that adaptive host-abandonment by nest-dwelling ectoparasites can influence within-brood parasite distributions around the time of fledging.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
house sparrow
haematophagous mite
ectoparasite
nest mites
Pellonyssus reedi
abandonment behaviour
within-brood distribution
Megjelenés:Journal Of Parasitology 94 : 5 (2008), p. 1038-1043. -
További szerzők:Szalmás Anita (1978-) (biológus, mikrobiológus, klinikai mikrobiológus) Liker András Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:T046661
OTKA
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5.

001-es BibID:BIBFORM022989
Első szerző:Szabó Krisztián (zoológus)
Cím:Effects of haematophagous mites on nestling house sparrows (Passer domesticus) / Krisztián Szabó, Anita Szalmás, András Liker, Zoltán Barta
Dátum:2002
ISSN:1230-2821
Megjegyzések:Haematophagous mites are frequently found on nestling house sparrows (Passer domesticus), but their effects are poorly known. In this study we investigated whether natural levels of infection by two mite species Pellonyssus reedi and Ornithonyssus sylviarum have any fitness consequences on their hosts, including some physiological indices of chick health, body condition and fledging success. Among the haematological variables, thrombocytes and heterophils, but not lymphocytes and eosinophil granulocytes showed positive correlations with mite loads. There was also a significant decrease in the haematocrit values of the nestling sparrows with increasing mite intensity. We found no significant effect of ectoparasites on shortterm indices of nestling fitness, such as body mass or fledging success. These results suggest that the bloodfeeding mites of the studied house sparrow population mainly affected the haematological parameters of their hosts: They generated a nonspecific immune response, with inflammatory processes and anaemia. On the other hand, parasite infestation seemingly has only weak influence on feather and skeletal growth of nestling sparrows, and no effect on fledging success and body mass.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Passer domesticus
Pellonyssus reedi
Ornithonyssus sylviarum
haematophagous mites
haematological variables
anaemia
immune response
body mass
fitness effects
Megjelenés:Acta Parasitologica 47 : 4 (2002), p. 318-322. -
További szerzők:Szalmás Anita (1978-) (biológus, mikrobiológus, klinikai mikrobiológus) Liker András Barta Zoltán (1967-) (biológus, zoológus)
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6.

001-es BibID:BIBFORM070941
Első szerző:Tóth Zoltán
Cím:Kinship and aggression: do house sparrows spare their relatives? / Tóth Zoltán, Bókony Veronika, Lendvai Ádám Z., Szabó Krisztián, Pénzes Zsolt, Liker András
Dátum:2009
ISSN:0340-5443 1432-0762
Megjegyzések:Kin-selection theory predicts that relatedness may reduce the level of aggression among competing group members, leading to indirect fitness benefits for kin-favoring individuals. To test this hypothesis, we investigated whether relatedness affects aggressive behavior during social activities in captive house sparrow (Passer domesticus) flocks. We found that sparrows did not reduce their aggression towards kin, as neither the frequency nor the intensity of fights differed between close kin and unrelated flock-mates. Fighting success was also unrelated to kinship and the presence of relatives in the flock did not influence the birds' dominance rank. These results suggest that the pay-offs of reduced aggression towards kin may be low in non-breeding flocks of sparrows, e.g. due to competition among relatives as predicted by a recent refinement of kin-selection theory. Our findings indicate that the significance of kin selection may be restricted in some social systems such as winter aggregations of birds.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Genetic relatedness
Aggression Dominance
Kin discrimination
House sparrow
Megjelenés:Behavioral Ecology And Sociobiology 63 : 8 (2009), p. 1189-1196. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Lendvai Ádám Zoltán (1977-) (biológus) Szabó Krisztián (1975-) (zoológus) Pénzes Zsolt Liker András
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7.

001-es BibID:BIBFORM070940
Első szerző:Tóth Zoltán
Cím:Whom do the sparrows follow? The effect of kinship on social preference in house sparrow flocks / Tóth Zoltán, Bókony Veronika, Lendvai Ádám Z., Szabó Krisztián, Pénzes Zsolt, Liker András
Dátum:2009
ISSN:0376-6357
Megjegyzések:Non-aggressive social interactions between group-mates, e.g. maintenance of spatial proximity or activity synchrony are basic elements of a species' social structure, and were found to be associated with important fitness consequences in group-living animals. In the establishment of such affiliative relationships, kinship has often been identified as one of the key predictors, but this has rarely been studied in simple social groups such as flocks of gregarious birds. In this study we investigated whether kinship affects social preference, as measured by the tendency to associate with others during various social activities, in captive house sparrow (Passer domesticus) flocks where birds could interact with differently related flock-mates. We found that preference between flock-mates was correlated with familiarity from early nestling period: same-brood siblings followed their sib initiating new activities more often than non-sib birds. The strength of association between birds also tended to correlate with genetic relatedness, but this was mainly due to the effect of siblings' affiliation. Thus we concluded that house sparrows prefer the company of their siblings during social activities even well after fledging, which may facilitate kin-biased behaviours.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Genetic relatedness
Social preference
Kin discrimination
Passer domesticus
Megjelenés:Behavioural Processes 82 : 2 (2009), p. 173-177. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Lendvai Ádám Zoltán (1977-) (biológus) Szabó Krisztián (1975-) (zoológus) Pénzes Zsolt Liker András
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8.

001-es BibID:BIBFORM070939
Első szerző:Tóth Zoltán
Cím:Effects of relatedness on social-foraging tactic use in house sparrows / Tóth Zoltán, Bókony Veronika, Lendvai Ádám Z., Szabó Krisztián, Pénzes Zsolt, Liker András
Dátum:2009
ISSN:0003-3472
Megjegyzések:Kin selection is often important in the evolution of reproductive behaviour, but we know much less about its significance for nonreproductive social groups. We investigated whether relatedness affects social-foraging behaviour in captive house sparrow, Passer domesticus, flocks, where birds may either search for food or exploit flockmates' food findings by scrounging. In such systems, both increased and decreased frequency of scrounging from relatives can be predicted by kin selection theory, depending on the relative costs and benefits of exploiting close kin. We found that birds used aggressive joining less often and obtained less food by that tactic from their close kin than from unrelated flockmates. In nonaggressive joinings, males also tended to join less often and obtained less food from close kin flockmates than from unrelated birds, whereas an opposite trend was found in females. Close kin males also spent less time feeding together from the same food patch than unrelated males, further suggesting reduced exploitation by male kin. These results suggest that house sparrows are able to recognize their close kin flockmates and reduce aggressive scrounging towards them, and that the sexes may differ in some forms of kin exploitation.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
genetic relatedness house sparrow kin discrimination Passer domesticus scrounging
Megjelenés:Animal Behaviour 77 : 2 (2009), p. 337-342. -
További szerzők:Bókony Veronika (alkalmazott zoológus) Lendvai Ádám Zoltán (1977-) (biológus) Szabó Krisztián (1975-) (zoológus) Pénzes Zsolt Liker András
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