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Fitting different visual models to behavioral patterns of parasitic egg rejection along a natural egg color gradient in a cavity-nesting host species
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SYSNO ASEP 0520689 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fitting different visual models to behavioral patterns of parasitic egg rejection along a natural egg color gradient in a cavity-nesting host species Author(s) Manna, T. J. (US)
Hanley, D. (US)
Honza, Marcel (UBO-W) RID, SAI, ORCID
Čapek, Miroslav (UBO-W) RID, ORCID, SAI
Rutila, J. (US)
Samaš, Peter (UBO-W) SAI, ORCID, RID
Abolins-Abols, M. (US)
Hauber, M. E. (US)Number of authors 8 Source Title Vision Research. - : Elsevier - ISSN 0042-6989
Roč. 167, FEB (2020), s. 54-59Number of pages 6 s. Language eng - English Country US - United States Keywords Brood parasitism ; Coevolution ; Conspecific acceptance threshold ; Perceptual modeling ; Visual recognition systems Subject RIV EG - Zoology OECD category Zoology R&D Projects GA17-12262S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UBO-W - RVO:68081766 UT WOS 000510315600008 EID SCOPUS 85077924408 DOI 10.1016/j.visres.2019.12.007 Annotation Avian brood parasites lay their eggs in other birds’ nests, and hosts can mitigate the fitness cost of raising unrelated offspring by rejecting parasitic eggs. A visually-based cognitive mechanism often thought to be used by hosts to discriminate the foreign egg is to compare it against the hosts’ own eggshell by size, shape, maculation, and/or ground coloration (i.e., absolute chromatic contrast). However, hosts may instead discriminate eggs based on their colors along a scale of natural avian eggshell coloration (i.e., directional chromatic contrast). In support of this latter visual process, recent research has found that directional chromatic contrasts can explain some host species’ rejection behavior better than absolute chromatic or achromatic contrasts. Here, for the first time, we conducted an experiment in a cavity-nesting host species to test the predictions of these different visual mechanisms. We experimentally parasitized nests of the Common Redstart Phoenicurus phoenicurus, a regular host of a mimetic-egg laying Common Cuckoo Cuculus canorus host-race, using painted, immaculate 3D-printed model eggs in two geographically distant areas (Finland and Czech Republic). We found that directional chromatic contrasts better explained rejection behaviors in both parasitized (Finland) and non-parasitized (Czech Republic) host populations, as hosts rejected eggs that were noticeably browner, but not eggs that were noticeably bluer, than redstart eggs. These results support the paradigm of a single rejection threshold predicted by the directional chromatic contrast model and contribute to a growing generality of these patterns across diverse avian host-brood parasite systems. Workplace Institute of Vertebrate Biology Contact Hana Slabáková, slabakova@ivb.cz, Tel.: 543 422 524 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0042698919302305?via%3Dihub
Number of the records: 1