A5071154612- Avian ecology and behavior
- Animal Behavior and Reproduction
- Advanced Chemical Physics Studies
- Textile materials and evaluations
- Plant and animal studies
- Animal Vocal Communication and Behavior
- Organic Chemistry Cycloaddition Reactions
- Wildlife Ecology and Conservation
- Bird parasitology and diseases
- Animal Ecology and Behavior Studies
- Ecology and Vegetation Dynamics Studies
- Spectroscopy and Quantum Chemical Studies
- Chemical Reaction Mechanisms
- Plant Parasitism and Resistance
- Magnetism in coordination complexes
- Chemical Thermodynamics and Molecular Structure
- Inorganic and Organometallic Chemistry
- Free Radicals and Antioxidants
- Rangeland Management and Livestock Ecology
- Genetic diversity and population structure
- Catalysis and Oxidation Reactions
- Crystallography and molecular interactions
- Protein Structure and Dynamics
- ATP Synthase and ATPases Research
- Marine and coastal plant biology
University of Debrecen
2015-2024
Evolutionary Genomics (United States)
2019
Budapest History Museum
2017
Budapest University of Technology and Economics
2008
University of Szeged
1964-2005
Institute of General and Physical Chemistry
1960-1990
University of California, Berkeley
1987
Lawrence Berkeley National Laboratory
1987
University of Sheffield
1968
B. Stevens and M. I. Ban, Trans. Faraday Soc., 1964, 60, 1515 DOI: 10.1039/TF9646001515
Hosts are expected to evolve resistance strategies that efficiently detect and resist exposure virulent parasites pathogens. When recognition is not error-proof, the acceptance threshold used by hosts recognize should be context dependent become more restrictive with increasing predictability of parasitism. Here, we demonstrate decisions great reed warblers Acrocephalus arundinaceus reject parasitism common cuckoo Cuculus canorus vary adaptively within a single egg-laying bout. typically...
Many avian hosts have evolved antiparasite defence mechanisms, including egg rejection, to reduce the costs of brood parasitism. The two main alternative cognitive mechanisms discrimination are thought be based on perceived discordancy eggs in a clutch or use recognition templates by hosts. Our experiments reveal that great reed warbler (Acrocephalus arundinaceus), host common cuckoo (Cuculus canorus), relies both mechanisms. In support mechanism, rejected their own (13%) and manipulated...
Many hosts have evolved diverse cognitive mechanisms to recognize and reduce the cost of social parasitism. For example, great reed warblers Acrocephalus arundinaceus can accurately reject closely mimetic eggs brood parasitic common cuckoos Cuculus canorus. Yet, these same are less effective at identifying rejecting parasitism when clutch is parasitized by multiple cuckoo eggs, suggesting a role for discordancy (the rejection egg type in minority clutch) and/or online self-referent phenotype...
Abstract Experimentation is at the heart of classical and modern behavioral ecology research. The manipulation natural cues allows us to establish causation between aspects environment, both internal external organisms, their effects on animals' behaviors. In recognition systems research, including quest understand coevolution sensory decision rules underlying rejection foreign eggs by hosts avian brood parasites, artificial stimuli have been used extensively, but not without controversy....
Sex-limited polymorphism has evolved in many species including our own. Yet, we lack a detailed understanding of the underlying genetic variation and evolutionary processes at work. The brood parasitic common cuckoo (
Many potential hosts of social parasites recognize and reject foreign intruders, reduce or altogether escape the negative impacts parasitism. The ontogenetic basis whether how avian their own brood parasitic eggs remains unclear. By repeatedly parasitizing same with a consistent egg type, contrasting responses naïve older breeders, we studied plasticity in rejection by great reed warbler (Acrocephalus arundinaceus), host species common cuckoo (Cuculus canorus).In response to experimental...
Chicks of virulent brood parasitic birds eliminate their nestmates and avoid costly competition for foster parental care. Yet, efforts to evict nest contents by the blind naked common cuckoo Cuculus canorus hatchling are counterintuitive as both adult parasites large older chicks appear be better suited tossing eggs young parents.Here we show experimentally that egg imposed a recoverable growth cost mass gain in during nestling period nests great reed warbler Acrocephalus arundinaceus hosts....
The developmental rate of cuckoo embryos and their hatching size is greater than that host species, which may require more nutrient resources in the egg intensive gas exchange during development. In present study, we compared various characteristics a brood parasite, common Cuculus canorus , its frequent host, great reed warbler Acrocephalus arundinaceus . As maternally‐derived testosterone known to enhance growth hatchlings, eggs are expected contain higher concentration eggs. addition,...
The offspring of brood parasitic birds benefit from hatching earlier than host young. A proposed but little-known strategy to achieve this is ‘internal incubation’, by retaining the egg in oviduct for an additional 24 h. To test this, we quantified stage embryo development at laying four (European cuckoo, Cuculus canorus ; African gularis greater honeyguide, Indicator indicator and cuckoo finch, Anomalospiza imberbis ). For two cuckoos all which lay 48 h intervals, embryos were a relatively...
Abstract Egg discrimination by hosts is an antiparasitic defence to reject foreign eggs from the nest. Even when mimetic, presence of brood parasitic egg(s) typically alters overall similarity all in a clutch, producing discordant clutch compared more homogenous clutches composed only hosts’ own eggs. In multiple parasitism, are laid nest, heterogeneous appears. Perceptual filters and recognition templates cannot explain known pattern lower rejection rates vs. single parasitism. We therefore...
Abstract Eurasian steppes have an essential role in conserving biodiversity, but due to the huge habitat loss past centuries they are often preserved only small refuges. Among such refuges ancient steppic burial mounds (the so called ‘kurgans’) which a high cultural and historical importance also sites of nature conservation. Despite their number (approximately half million) conservational there is lack knowledge on locality state kurgans most regions Eurasia. To fill this gap, we built...
Evolutionary adaptations are required by common cuckoos Cuculus canorus to match host eggs. Hosts may discriminate against alien eggs; hence, accurate matching of the parasite egg hosts' is essential. Egg shape least-studied component mimicry, and it also have other functions: an optimal necessary for effective incubation. For this reason, cuckoo eggs show a wide range variations in set species. Here, we compare using parameters two distant areas: from nests great reed warblers Acrocephalus...
The coevolutionary process among avian brood parasites and their hosts involves stepwise changes induced by the antagonistic selection pressures of one on other. As long‐term data an evolutionary scale is almost impossible to obtain, most studies can only show snapshots such processes. Information host behaviour, as in egg rejection rates methods are scarce. In Hungary there interesting case between common cuckoo Cuculus canorus great reed warbler Acrocephalus arundinaceus , where level...
Capsule Brood parasitic Common Cuckoo Cuculus canorus chicks hatch earlier than the nestlings of their Great Reed Warbler Acrocephalus arundinaceus hosts, but hatching priority is less consistent when eggs are laid after onset host incubation.Aim To reveal by field observations what optimal stage for Cuckoos to lay in relation laying cycle ensure prior chicks.Methods We monitored hosts' at which appeared and also incubation behaviour.Results Warblers incubated more on day 5 host's relative...
Abstract Obligate brood parasitic birds have evolved a rare avian strategy for reproduction by laying eggs in the nests of other species. In doing so, their breeding ranges, but not necessarily foraging habitats, become intimately related to nesting territories hosts. We studied home range sizes and distribution patterns Common Cuckoos (Cuculus canorus) on grounds central Hungary, where cuckoos parasitize only Great Reed Warblers (Acrocephalus arundinaceus) channel-side reed-beds at high...
It is well known that avian brood parasites lay their eggs in the nests of other bird species, called hosts. remains less clear, however, just how are able to recognize hosts and identify exact location appropriate in. While previous studies attributed high importance visual signals finding hosts' (e.g. nest building activity or distance direct sight from vantage points used by parasites), role host acoustic during searching stage has been largely neglected. We present experimental evidence...
Abstract To avoid mobbing attacks by their hosts during egg laying, some avian brood parasites have evolved traits to visually and/or acoustically resemble predator(s) of hosts. Prior work established that reed warblers ( Acrocephalus scirpaceus ), a small host species the parasitic common cuckoo Cuculus canorus delayed returning nest when confronted either calls female or predatory sparrowhawk Accipiter nisus ). It remains less clear, however, whether also suppress defences larger and more...
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 nest size of a species, Great Reed Warbler (Acrocephalus arundinaceus), reveal information on parental abilities level defense against Cuckoos. Second, we analyzed female Cuckoos' preference for nests predicted degree expression host. Earlier-breeding hosts built bigger nests, were more active singers, had less...
Common Cuckoos (<i>Cuculus canorus</i>) parasitize nests of small passerines. The Cuckoo chicks cause the death their nest-mates when evicting eggs or nestlings from nests; consequently, hosts suffer a high loss reproduction. Host adaptations against parasitism, e.g., by egg discrimination behavior, and cuckoo counter-adaptations to hosts, mimetic eggs, are often regarded as result arms race between two interacting species. In Hungary Great Reed Warblers (<i>Acrocephalus arundinaceus</i>)...
Abstract The ratio of excimer to molecular fluorescence intensities in both the delayed and total emission spectra pyrene ethanol has been measured as a function solute concentration temperature from 150–350°K. An analysis data terms triplet-triplet annihilation leading directly formation (process 1) or production lowest excited singlet state 2) shows that relative probabilities k 1/k 2 these processes increases zero at low temperatures maximum 1.8 higher temperatures.