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1.

001-es BibID:BIBFORM054066
Első szerző:Barta Zoltán (biológus, zoológus)
Cím:Social Role Specialization Promotes Cooperation between Parents / Zoltán Barta, Tamás Székely, András Liker, Freya Harrison
Dátum:2014
Megjegyzések:Biparental care of offspring is a widespread social behavior, and various ecological, life-history, and demographic factors have been proposed to explain its evolution and maintenance. Raising offspring generally requires several types of care (e.g., feeding, brooding, and defense), and males and females often specialize in providing diffferent types of care. However, theoretical models of care often assume that care is a single variable and hence that a unit of care by the mother is interchangable with a unit of care by the father. We hypothesize that the ability of one parent to provide all types of care may be limited by nonadditive costs or by sex-based asymmetries in the costs of particular care types. Using an individual-based simulation, we show that synergistic costs of investing in two tasks or negligible sex-based cost asymmetries select for task specialization and biparental care. Biparental care persists despite intense sexual selection and sex-based mortality, suggesting that previous models make overly restrictive predictions of the conditions under which cooperation can be maintained. Our model provides a mechanistic underpinning for published models that show that the synergistic benefits of individuals cooperating can stabilize cooperation, both in the context of parental care and in other social scenarios.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
evolutionary simulation
mortality
parental care
sexual selection
social evolution
Élettudományok - Biológiai tudományok
Megjelenés:The american naturalist. - 183 : 6 (2014), p. 747-761. -
További szerzők:Székely Tamás (1959-) (biológus) Liker András Harrison, Freya
Pályázati támogatás:MTA-DE Lendület
MTA
Viselkedésökológiai Kutatócsoport
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2.

001-es BibID:BIBFORM023387
Első szerző:Barta Zoltán (biológus, zoológus)
Cím:Viselkedésbiológiai kutatások természetvédelmi alkalmazásának lehetőségei / Barta Zoltán, Liker András
Dátum:1999
Megjegyzések:A viselkedésbiológia és a konzervációbiológia napjaink egyedfeletti biológiájának legdinamikusabban fejlődő területei közé tartoznak. E cikkben áttekintjük a közöttük már kialakult és még feltáratlan együttműködési területeket, és javaslatokat teszünk olyan, véleményünk szerint hazánkban is megindítható viselkedésbiológiai kutatásokra melyek eredményeit a hazai természetvédelem is felhasználhatja.
Tárgyszavak:Természettudományok Biológiai tudományok magyar nyelvű folyóiratközlemény hazai lapban
állati viselkedés
konzervációbiológia
természetvédelem
viselkedésbiológia
viselkedésökológia
Megjelenés:Természetvédelmi Közlemények. - 8 (1999), p. 89-109. -
További szerzők:Liker András
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3.

001-es BibID:BIBFORM022845
Első szerző:Barta Zoltán (biológus, zoológus)
Cím:The effects of predation risk on the use of social foraging tactics / Zoltán Barta, András Liker, Ferenc Mónus
Dátum:2004
Megjegyzések:The effects of predation on the use of social foraging tactics, such as producing and scrounging, are poorly known in animals. On the one hand, recent theoretical models predict increased use of scrounging with increasing predation risk, when scroungers seeking feeding opportunities also have a higher chance of detecting predators. On the other hand, there may be no relation between tactic use and predation when antipredator vigilance is not compatible with scanning flockmates. We investigated experimentally the effects of predation risk on social foraging tactic use in tree sparrows, Passer montanus. We manipulated predation risk in the field by changing the distance between shelter and a feeder. Birds visited the feeder in smaller flocks, spent less time on it and were somewhat more vigilant far from shelter than close to it. Increased predation risk strongly affected the social foraging tactic used: birds used the scrounger tactic 30% more often far from cover than close to it. Between-flock variability in scrounging frequency was not related to the average vigilance level of the flock members, and within-flock variability in the use of scrounging was negatively related to the vigilance of birds. Our results suggest that in tree sparrows, the increased frequency of scrounging during high predation risk cannot simply be explained by an additional advantage of increasing antipredator vigilance. We propose alternative mechanisms (e.g. increased stochasticity in food supply, and that riskier places are used by individuals with lower reserves) that may explain increased scrounging when animals forage under high predation risk
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Animal Behaviour. - 67 : 2 (2004), p. 301-308. -
További szerzők:Liker András Mónus Ferenc
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4.

001-es BibID:BIBFORM098542
035-os BibID:(cikkazonosító)109396 (WoS)000722192800007 (Scopus)85119432181
Első szerző:Csákvári Edina biológus, ökológus)
Cím:Conservation biology research priorities for 2050: A Central-Eastern European perspective / Csákvári Edina, Fabók Veronika, Bartha Sándor, Barta Zoltán, Batáry Péter, Borics Gábor, Botta-Dukát Zoltán, Erős Tibor, Gáspár Judit, Hideg Éva, Kovács-Hostyánszki Anikó, Sramkó Gábor, Standovár Tibor, Lengyel Szabolcs, Liker András, Magura Tibor, Márton András, Molnár V. Attila, Molnár Zsolt, Oborny Beáta, Ódor Péter, Tóthmérész Béla, Török Katalin, Török Péter, Valkó Orsolya, Szép Tibor, Vörös Judit, Báldi András
Dátum:2021
ISSN:0006-3207
Megjegyzések:One of the main goals of the EU Biodiversity Strategy for 2030 is to avoid further loss of biodiversity and to restore ecosystems. These efforts can be facilitated by compiling the main research topics related to conservation biology to provide new evidence for the most urgent knowledge gaps, and publicise it to researchers, research funders and policy makers. We used the possible future statements from the Hungarian Environmental Foresight Report for 2050 which identified region-specific problems. To highlight likely future environmental and conservation questions, in this study we asked researchers from the fields of ecology and conservation to define research questions addressing these future statements in line with international research trends and challenges. The study resulted in fourteen priority research topics, split into seven clusters relevant to biological conservation that should be targeted by stakeholders, primarily policy makers and funders to focus research capacity to these topics. The main overarching themes identified here include a wide range of approaches and solutions such as innovative technologies, involvement of local stakeholders and citizen scientists, legislation, and issues related to human health. These indicate that solutions to conservation challenges require a multidisciplinary approach in design and a multi-actor approach in implementation. Although the identified research priorities were listed for Hungary, they are in line with European and global biodiversity strategies, and can be tailored to suit other Central and Eastern European countries as well. We believe that our prioritisation can help science?policy discussion, and will eventually contribute to healthy and well-functioning ecosystems.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Biodiversity conservation
Habitat restoration
Ecosystem services
Pannonian biogeographical region
Research prioritisation
Megjelenés:Biological Conservation. - 264 (2021), p. 1-8. -
További szerzők:Fabók Veronika Bartha Sándor Barta Zoltán (1967-) (biológus, zoológus) Batáry Péter Borics Gábor (biológus) Botta-Dukát Zoltán Erős Tibor Gáspár Judit Hideg Éva Kovács-Hostyánszki Anikó Sramkó Gábor (1981-) (biológus) Standovár Tibor Lengyel Szabolcs (1971-) (biológus) Liker András Magura Tibor (1969-) (ökológus) Márton András Molnár V. Attila (1969-) (biológus, botanikus) Molnár Zsolt (botanikus) Oborny Beáta Ódor Péter Tóthmérész Béla (1960-) (ökológus) Török Katalin Török Péter (1979-) (biológus-ökológus) Valkó Orsolya (1985-) (biológus) Szép Tibor Vörös Judit Báldi András
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DOI
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5.

001-es BibID:BIBFORM022848
Első szerző:Lendvai Ádám Zoltán (biológus)
Cím:The effect of energy reserves on social foraging: hungry sparrows scrounge more / Ádám Z. Lendvai, Zoltán Barta, András Liker, Veronika Bókony
Dátum:2004
ISSN:0962-8452
Megjegyzések:Animals often use alternative strategies when they compete for resources, but it is unclear in most cases what factors determine the actual tactic followed by individuals. Although recent models suggest that the internal state of animals may be particularly important in tactic choice, the effects of state variables on the use of alternative behavioural forms have rarely been demonstrated. In this study, using experimental wind exposure to increase overnight energy expenditure, we show that flock-feeding house sparrows (Passer domesticus) with lowered energy reserves increase their use of scrounging (exploiting others' food findings) during their first feed of the day. This result is in accordance with the prediction of a state-dependent model of use of social foraging tactics. We also show that scrounging provides less variable feeding rates and patch finding times than the alternative tactic. These latter results support the theoretical assumption that scrounging is a risk-averse tactic, i.e. it reduces the risk of immediate starvation. As the level of energy reserves predicts the use of social foraging tactics, we propose that selection should favour individuals that monitor the internal state of flock mates and use this information to adjust their own tactic choice.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
producer-scrounger game
state-variables
starvation risk
foraging strategies
house sparrow
Passer domesticus
Megjelenés:Proceedings of the Royal Society. Series B. Biological sciences. - 271 : 1556 (2004), p. 2467-2472. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus) Liker András Bókony Veronika (alkalmazott zoológus)
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6.

001-es BibID:BIBFORM021571
Első szerző:Lendvai Ádám Zoltán (biológus)
Cím:The effects of energy reserves and dominance on the use of social-foraging strategies in the house sparrow / Ádám Z. Lendvai, András Liker, Zoltán Barta
Dátum:2006
Megjegyzések:In social animals, dominance rank often influences individuals' behaviour, but in most cases it is unknown how dominance modulates the effects of other phenotypic traits. We investigated the mutual effects of social dominance and the level of energy reserves on the use of social-foraging strategies in captive flocks of house sparrows, Passer domesticus.We used experimental wind exposure to manipulate overnight energy expenditure of dominant and subordinate individuals. In response to the experimental treatment dominants used scrounging (exploiting others' food finding) significantly more, whereas for subordinates there was only a moderate and nonsignificant increase in scrounging. Individual variability in the frequency of scrounging was higher in subordinates than in dominants and this difference between the dominance groups was unaffected by the treatment. These results suggest that individuals of different dominance status adopt different strategies: to cope with an energetically challenging situation, dominants behave rather uniformly by increasing further their preference for scrounging, whereas subordinates do not alter their tactic, but may rely on using scrounging opportunistically.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Animal behaviour. - 72 : 4 (2006), p. 747-752. -
További szerzők:Liker András Barta Zoltán (1967-) (biológus, zoológus)
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7.

001-es BibID:BIBFORM023351
Első szerző:Liker András
Cím:Male badge size predicts dominance against females in House Sparrows1 / András Liker, Zoltán Barta
Dátum:2001
Megjegyzések:We investigated dominance relationships and the use of male badge size as a status signal in a mixed-sex flock of House Sparrows (Passer domesticus). Specifically, we tested whether females differ from males in their fighting behavior or dominance status, and whether badge size predicts dominance and fighting success of males in male-female fights. We found that both sexes were involved frequently in aggressive encounters, and the mean dominance rank of males did not differ from the mean rank of females. Badge size was the only significant predictor of the dominance rank of males, and was a good predictor of their aggressiveness measured as the proportion of fights initiated. On the other hand, female dominance rank was correlated with body weight. In male-female fights, both the proportion of female-initiated aggressive interactions and the proportion of fights won by females decreased with increasing size of the opponent's badge. Large-badged males dominated more females in dyadic interactions than smaller-badged males. These correlational results suggest that male badge size may be used as a signal of dominance status between male and female House Sparrows in winter flocks.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
badge size
dominance
House Sparrow
intersexual aggression
Passer domesticus
social behavior
status signaling
Megjelenés:The Condor. - 103 : 1 (2001), p. 151-157. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus)
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8.

001-es BibID:BIBFORM022983
Első szerző:Liker András
Cím:The Effects of Dominance on Social Foraging Tactic Use in House Sparrows / András Liker, Zoltán Barta
Dátum:2002
Megjegyzések:We investigated whether social foraging tactic use (producing and scrounging) in birds is affected by the dominance rank of individuals as predicted by a phenotype limited producerscrounger game. In a captive ? ock of house sparrows, we observed the behaviour of the birds when they were foraging on a grid containing clumps of seeds. We measured the ? ghting success of the birds, determined the method by which they found food clumps (? nding or joining), and measured their feeding rate. Joining were frequently observed and usually involved aggressive interactions. Most birds used both ? nding and joining to obtain food. We found that foraging method was related to dominance: the frequency of joining gradually increased with increasing dominance rank, as predicted by the phenotype limited model for ? ocks where there are moderate competitive asymmetries among the birds. Food intake rate of individuals was not related to either their dominance rank or foraging method. Similar weak relationships were predicted by the model among these variables for ? ocks with moderate competitive asymmetries. Behavioural variability among sparrows in locomotion frequency and vigilance was not related to their foraging method, but the rate of investigating potential food caches strongly decreased with increasing frequency of joining. We conclude that the phenotype limited model successfully predicts the relationship between dominance and joining frequency in house sparrows feeding on concentrated food sources, and we suggest that the distribution of food used in tests of the model may crucially affect their results
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Behaviour. - 139 : 8 (2002), p. 1061-1076. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus)
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9.

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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10.

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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11.

001-es BibID:BIBFORM022915
035-os BibID:(WoS)000225203700004 (Scopus)11444264010
Első szerző:Torda G.
Cím:Dominance hierarchy and status signalling in captive tree sparrow (Passer montanus) flocks / G. Torda, A. Liker, Z. Barta
Dátum:2004
ISSN:1217-8837
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
tree sparrow
Passer montanus
badge size
dominance hierarchy
status signalling
Megjelenés:Acta Zoologica Academiae Scientiarum Hungaricae. - 50 : 1 (2004), p. 35-44. -
További szerzők:Liker András Barta Zoltán (1967-) (biológus, zoológus)
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