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001-es BibID:	BIBFORM066150
Első szerző:	Mónus Ferenc
Cím:	Is foraging time limited during winter? : A feeding experiment with tree sparrows under different predation risk / Ferenc Mónus, Zoltán Barta
Dátum:	2016
ISSN:	0179-1613
Megjegyzések:	Small passerines are faced with a trade-off when foraging during winter. Increasing energy reserves makes them more vulnerable to predators, while a low level of reserves exposes them to a high risk of starvation. Whether small birds under these circumstances are allowed to reduce their foraging activity under increased predation risk, for example in feeding sites more exposed to predators, remains controversial in former behavioural and ecological researches. In this study, we investigated the foraging activity of free-living Tree Sparrow Passer montanus flocks feeding on an artificial feeding platform. The predation risk perceived by the sparrows was manipulated by placing the platform either close to or far from a bushy shelter. Foraging activity, assessed as cumulative activity of sparrows per unit time on the platform, did not differ between the low-risk and the high-risk conditions and did not significantly change during the day. Feeding efficiency, assessed as pecking rate, was not either reduced under the high-risk condition. Our results suggest that sparrows were forced to feed almost continuously during the day in order to maintain their preferred level of energy reserves. However, several behavioural changes helped sparrows to adopt a safer foraging policy when feeding far from cover, as we found in another study. Altogether, sparrow flocks feeding far from cover decreased the overall foraging time (the time when any sparrow stayed on the platform) by approximately 20% as compared to the near cover condition. A possible way to maintain the same level of foraging activity despite of the reduction in overall foraging time is discussed.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban foraging activity predation risk time-limited foraging Tree Sparrow
Megjelenés:	Ethology 122 : 1 (2016), p. 20-29. -
További szerzők:	Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:	T-46661 OTKA K75696 OTKA 4.2.1./B-09/1/KONV-2010-0007 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM018800
Első szerző:	Mónus Ferenc
Cím:	The effect of within-flock spatial position on the use of social foraging tactics in free-living tree sparrows / Ferenc Mónus, Zoltán Barta
Dátum:	2008
ISSN:	0179-1613
Megjegyzések:	The benefit of producer (searches for own food) or scrounger (exploits the others' food discoveries) foraging tactic in a group of socially feeding animals may depend on where the individual searches for food within the group. Scrounging may be more advantageous in the centre of the group, having more individuals around to join, while producing may be more beneficial at the edges, where more unexplored food patches may be found. This study shows within-flock position correlates with forag- ing tactic use of feeding birds in socially foraging tree sparrows, Passer montanus. Sparrows staying closer to the centre of the flock found their food patches more requently by joining (i.e. use more frequently the scrounging tactic) than those staying toward the edges. To our knowledge this is the first field study demonstrating the relationship between spatial position and foraging tactic use. We investigated this relationship under different perceived predation hazard, and found that under elevated risk of predation, central individuals may increase their use of joining more than individuals on the periphery of the flock. Moreover, we show that extremely specialized use of searching tactics may be very infrequent in tree sparrows. As both within-flock position and search tactic use can be altered very quickly and without leaving the flock, individuals may easily alter them in order to adjust their behaviour.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Ethology. - 114 : 3 (2008), p. 215-222. -
További szerzők:	Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:	NF 61143 OTKA T-46661 OTKA
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM087555
Első szerző:	Somogyi Anna Ágnes (biológus)
Cím:	Colony size, nestmate density and social history shape behavioural variation in Formica fusca colonies / Anna Ágnes Somogyi, András Tartally, István Elek Maák, Zoltán Barta
Dátum:	2020
ISSN:	0179-1613 1439-0310
Megjegyzések:	In ants, individuals live in tightly integrated units (colonies) and work collectively for its success. In such groups, stable intraspecific variation in behaviour within or across contexts (personality) can occur at two levels: individuals and colonies. This paper examines how colony size and nestmate density influence the collective exploratory behaviour of Formica fusca (Hymenoptera: Formicidae), in the laboratory. The housing conditions of the colonies were manipulated to vary the size of colonies and their densities under a fully factorial design. The results demonstrate the presence of colony behavioural repeatability in this species, and contrary to our expectations, colonies were more explorative on average when they were kept at lower nestmate densities. We also found that experimental colonies created from larger source colonies were more explorative, which conveys that a thorough understanding of the contemporary behaviour of a colony may require knowing its social history and how it was formed. Our results also convey that the colony size and nestmate density can have significant effects on the exploratory behaviour of ant colonies.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk collective behaviour colony size exploration housing condition nestmate density
Megjelenés:	Ethology. - 126 : 7 (2020), p. 727-734. -
További szerzők:	Tartally András (1975-) (biológus) Maák István Elek Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:	EFOP-3.6.1-16-2016-00022 EFOP ÚNKP-18-4-DE-452 Egyéb ÚNKP-19-4-DE-303 Egyéb PCIG11-GA-2012-322110 Egyéb NKFIH-1150-6/2019 FIKP
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