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001-es BibID:BIBFORM028111
Első szerző:Avilés, Jesús M.
Cím:Common Cuckoos (Cuculus canorus) Do Not Rely on Indicators of Parental Abilities When Searching for Host Nests: The Importance of Host Defenses / Jesús M. Avilés, Csaba Moskát, Miklós Bán, Rita Har gitai, Deseada Parejo
Dátum:2009
ISSN:0004-8038
Megjegyzések:There is widespread evidence that individuals within and among host populations are not evenly parasitized by Common Cuckoos (Cuculus canorus). We first investigated whether the song and nest size of a host species, the Great Reed Warbler (Acrocephalus arundinaceus), reveal information on parental abilities and level of defense against Common Cuckoos. Second, we analyzed whether female Common Cuckoos' preference for host nests is predicted by the degree of song expression and the nest size of the host. Earlier-breeding hosts built bigger nests, were more active singers, and had less rich syllable repertoires than late breeders. Host nestlings raised in a big nest received more feedings than those raised in a small nest. Host males that were active singers were paired with females that built bigger nests. All host pairs rejected nonmimetic artificial eggs, but those with a big nest were more prone to reject natural Common Cuckoo eggs. Thus, Great Reed Warbler pairs with a big nest were more willing to feed nestlings, but also had higher discriminatory abilities against Common Cuckoo eggs, than those with a small nest. These findings, and female Common Cuckoos' inability to capture the information provided by Great Reed Warblers' sexual signals, may explain why the females followed a simple rule of selecting the more visible host nests in the population.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:The auk. - 126 : 2 (2009), p. 431-438. -
További szerzők:Moskát Csaba Bán Miklós (1975-) (biológus) Hargitai Rita Parejo, Deseada
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DOI
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001-es BibID:BIBFORM028108
Első szerző:Moskát Csaba
Cím:Increased host tolerance of multiple cuckoo eggs leads to higher fledging success of the brood parasite / Csaba Moskát, Márk E. Hauber, 1, Jesús M. Avilés, Miklós Bán, Rita Hargitaie, Marcel Honza
Dátum:2009
ISSN:0003-3472
Megjegyzések:In birds, multiple parasitism is the laying of two or more eggs by one or more parasitic females in a single host nest. Several cognitive mechanisms may explain how multiple parasitism could affect parasite egg discrimination by hosts. Rejection based on discordance predicts that multiple parasitism provides a perceptually more error-prone way for hosts to reject parasitism because more foreign eggs decrease the chance that any one egg is perceived as most dissimilar and recognized as foreign, unless parasite eggs are all similarly highly nonmimetic. In contrast, rejection based on clutch uniformity predicts that in multiple parasitism egg rejection is more error-proof if mimicry by parasite eggs is variable, because increased variation in egg appearance makes for easier egg rejection for hosts. Finally, true egg recog- nition, that is, rejection based on memory of the host's own eggs, predicts no differences in rejection rates from nests with single or multiple parasitism. We studied common cuckoos, Cuculus canorus, parasitizing a population of great reed warblers, Acrocephalus arundinaceus, in Hungary where multiple parasitism was frequent. Hosts rejected parasite eggs less often in nests with multiple parasitism than in nests with single parasitism. These observations were confirmed by experimental parasitism and support the rejection based on discordance hypothesis. As hosts were more likely to tolerate cuckoo eggs in nests with multiple parasitism, we found that multiple parasitism more than doubled cuckoos' reproductive output per host nest compared to single parasitism.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Animal Behaviour. - 77 : 5 (2009), p. 1281-1290. -
További szerzők:Hauber, Mark E. Avilés, Jesús M. Bán Miklós (1975-) (biológus) Hargitai Rita Honza Marcel
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3.

001-es BibID:BIBFORM005419
Első szerző:Moskát Csaba
Cím:Experimental support for the use of egg uniformity in parasite egg discrimination by cuckoo hosts / Csaba Moskát, Jesús M. Avilés, Miklós Bán, Rita Hargitai, Anikó Zölei
Dátum:2008
Megjegyzések:Common cuckoo (Cuculus canorus) parasitism drastically reduces the reproductive success of their hosts and selects for host discrimination of cuckoo eggs. In a second stage of anti-parasite adaptation, once cuckoos can lay eggs that mimic those of their hosts, a high uniformity of host egg appearance within a clutch may favour cuckoo egg discrimination. Comparative evidence provides indirect support for this hypothesis although experimental support is currently lacking. Here, we studied the effect of experimentally decreased uniformity of host egg appearance on cuckoo egg discrimination by great reed warbler (Acrocephalus arundinaceus) hosts in a population in which long-term cuckoo parasitism has led to high levels of cuckoo?host egg mimesis. We manipulated host clutch uniformity by adding extra spots to fresh host eggs just after they were laid. Rejection of non-mimetic experimental eggs added to these nests was compared with those in control nests in which uniformity was not altered. Previously, by over-painting real spots in a control group of nests, we showed a negligible effect of our paints on hosts' perception of their eggs. We show that for the great reed warbler, non-mimetic experimental eggs were relatively more tolerated in experimental nests, i.e. with lower unifor- mity (40%) than in control nests (5%). This is the first experimental study, to our knowledge, which demonstrates a reduced discrimination of foreign eggs as a consequence of an increase of egg phenotypes variation perception in a cuckoo host.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Behavioral Ecology and Sociobiology. - 62 (2008), p. 1885-1890. -
További szerzők:Avilés, Jesús M. Bán Miklós (1975-) (biológus) Hargitai Rita Zölei Anikó
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