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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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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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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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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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