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Article
Alfréd Trnka, Auteur ; Peter Samaš, AuteurDouble brooding, the laying of a second clutch after successfully fledging young from a first nest in a season, is a common reproductive strategy among short-lived birds to increase annual breeding success. Nevertheless, there is widespread intr[...]
Article
Oldřich Mikulica, Auteur ; Alfréd Trnka, AuteurUsing direct observations of Common Cuckoo Cuculus canorus behaviour at 53 nests of three Acrocephalus host species, we recorded no vocal activity by females shortly before, during, or after egg-laying, which suggests that female bubbling calls [...]
Article
Alfréd Trnka, AuteurBirds are one of the best-studied animal groups in Europe. Despite this, there are several bird species, including the Little Bittern (Ixobrychus minutus), of which the breeding biology is still little known. Here. I examine the sex of offspring[...]
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Alfréd Trnka, AuteurArtificial fishponds are assumed to be suitable alternative habitat for many waterbirds including fish-eating predators such as herons. However, fish farming may lead to contrasting consequences for birds breeding in these biotopes and act as an[...]
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Alfréd Trnka, Auteur ; Milica Požgayová, AuteurCapsule: Using dummy experiments at nests of Great Reed Warblers Acrocephalus arundinaceus, we found no evidence to support the hypothesis that the contrasting black and white plumage colouration in Magpies Pica pica has evolved to reduce mobbin[...]
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Alfréd Trnka, AuteurCapsule The Little Bittern is highly suitable as Common Moorhen host in terms of accepting and incubating parasitic eggs, however, the survival of Common Moorhen chicks remains disputable.
Article
Alfréd Trnka, Auteur ; Pavol Prokop, AuteurPredation can act as a selective pressure on birds, which may be expected therefore to change habitat use in the presence of predators. To examine this, experiments were performed using Marsh Harrier Circus aeruginosus silhouettes. The effect of[...]
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Alfréd Trnka, Auteur ; Milica Požgayová, Auteur ; Petr Procházka, Auteur ; Miroslav Capek, Auteur ; Marcel Honza, AuteurThe use of active chemical defence against predators is relatively rare in birds. Among others, it has been reported for some members of family Cuculidae whose chicks, when threatened, expel dark foul-smelling liquid from their cloaca. Apart fro[...]
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Alfréd Trnka, Auteur ; Viera Peterkova, Auteur ; Zuzana Grujbarova, AuteurIncreasing evidence suggests that birds minimize the risk of nest predation by preferentially settling in territories with low predator encounter rate. However, little is known about whether they are also able to assess the actual risk of nest p[...]
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Alfréd Trnka, Auteur ; Péter Batáry, Auteur ; Pavol Prokop, AuteurWe studied the rate of predation on artificial and natural nests of Great Reed Warbler Acrocephalus arundinaceus in two contrasting vegetation types, reed Phragmites australis and reed mace Typha angustifolia beds. Reed provided thinner and tall[...]
Article
Alfréd Trnka, Auteur ; Pavol Prokop, AuteurThere is increasing evidence that hosts within a population may not be parasitized by common cuckoos Cuculus canorus with equal probability. Such non-randomness has been documented, for example, for host nest sites and host quality. In this stud[...]
Article
Alfréd Trnka, Auteur ; Pavol Prokop, AuteurWe documented and experimentally tested the use of snake skins in construction of nests in a Great Reed Warbler Acrocephalus arundinaceus population in southwestern Slovakia. There was no difference in predation rates of artificial nests that di[...]
