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Evidence for egg discrimination preceding failed rejection attempts in a small cuckoo host
This is the first demonstration of a cuckoo host discriminating against real parasitic eggs but often accepting them, and results show that in host species experiencing difficulties in performing puncture ejection, non-mimetic cuckoos eggs may avoid rejection by means of their unusually high structural strength.
Avian colour perception predicts behavioural responses to experimental brood parasitism in chaffinches
A perceptual model of colour discrimination is applied to study behavioural responses to natural variation in parasite egg appearance in chaffinches Fringilla coelebs and confirms that colour differences of the eggs as perceived by birds are important integral parts of a matching signal used by chaffinch hosts.
Genetic differentiation among sympatric cuckoo host races: males matter
This first study that finds significant genetic differentiation in biparentally inherited markers among cuckoo host-specific races implies that males also may contribute to the evolution and maintenance of the different races, and hence that the genes responsible for egg phenotype may be found on autosomal chromosomes rather than the female-specific W-chromosome as previously assumed.
Factors influencing the risk of common cuckoo Cuculus canorus parasitism on marsh warblers Acrocephalus palustris
Though smaller nests tended to be parasitized more frequently than larger ones, nest size only approached significance, making its importance unclear, andTree height was an important predictor of parasitism, with higher trees increasing the parasitism odds ratio.
Rapid change in host use of the common cuckoo Cuculus canorus linked to climate change
- A. Møller, N. Saino, J. Shykoff
- Environmental ScienceProceedings of the Royal Society B: Biological…
- 7 March 2011
It is found that relative parasitism of residents and short-distance migrants decreased and this change in host use was positively related to increase in spring temperature, consistent with the prediction that relative change in phenology for different migrant classes drives host-use patterns.
Eggshell strength of an obligate brood parasite: a test of the puncture resistance hypothesis
- A. Antonov, B. Stokke, A. Moksnes, O. Kleven, M. Honza, E. Røskaft
- BiologyBehavioral Ecology and Sociobiology
- 11 January 2006
There was no evidence that egg damage was associated with cuckoo egg laying, and some support for the puncture resistance hypothesis for the occurrence of thick-shelled eggs in common cuckoos Cuculus canorus.
Egg phenotype differentiation in sympatric cuckoo Cuculus canorus gentes
The three cuckoo gentes showed a remarkable degree of mimicry to their three host species in some but not all egg features, including egg size, a hitherto largely ignored feature of egg mimicry.
Nest-Site Selection in the Magpie Pica pica in a High-Density Urban Population of Sofia (Bulgaria)
The study revealed one of the highest densities for Magpies in a 405 ha area urban habitat and the lack of a clear adjustment between the nest-site selection pattern and breeding success was hypothesized to be due to two non-exclusive mechanisms: either there are no strong selective pressures at any type of nest- site and on the behavioral plasticity of MagPies or else selective pressures may change during the season.
Getting rid of the cuckoo Cuculus canorus egg: why do hosts delay rejection?
The results are consistent with the hypothesis that host motivation when confronted with mimetic eggs needs to increase above a certain threshold before rejection behavior is released, which likely minimizes the risk of recognition errors.
Isolation by time and habitat and coexistence of distinct host races of the common cuckoo
Common cuckoos reproduced at a similar, but narrower subset of dates as did possible hosts, showing that only a fraction of hosts with specific breeding dates were parasitized, consistent with cuckoo host races being isolated by timing of breeding and habitat.