Multiple structural colors of the plumage reflect age, sex, and territory ownership in the Eurasian Magpie Pica pica

• Autorzy: Nam H.-Y. , Lee S.-I. , Lee J. , Choi C.-Y. , Choe J.C.

Warianty tytułu

PL

Związek barw strukturalnych upierzenia srok z płcią, wiekiem i statusem terytorialnym osobników

• Języki publikacji: EN

Abstrakty

EN

The role of structural coloration, which is produced by the optical interactions among micro- and nanostruc- tures in the feather barb or barbules, is still unclear in the context of sexual or social signaling, because the mechanism of color production is complex and the factors affecting it are not fully documented. We investigated whether structural colors represent class signals related to age, sex, and territory ownership in a social, sexually monochromatic species, the Eurasian Magpie Pica pica. We examined the reflectance spectra from white scapulars, bluish iridescent secondary and greenish iridescent tail plumage, as well as size of white scapular patch. Significant color differences between age classes were found in all measured plumage parts, with adults having plumage with higher color score, that is brighter, shorter wavelength-directed, and more saturated color, than young magpies. Color differences between males and females and between breeding adults (territorial owners) and non-breeding adults were only detected in the tail plumage. Size of white scapular patch did not differ between age and sex classes. Color differences among individuals belonging to different social classes may lessen agonistic confrontations. Sex differences in coloration may enable prompt sex recognition and thus facilitate pair formation. Higher tail color scores of adults, particularly males, support previous suggestions that the tail characteristics of avian species with relatively long tails represent a visual signal of the bearer's quality.

PL

Rola barw strukturalnych, które powstają poprzez rozpraszanie światła w promieniach i promykach piór nie jest jasna w kontekście sygnałów płciowych lub socjalnych, ponieważ mechanizm powstawania kolorów jest skomplikowany, a czynniki wpływające na te barwy nie są w pełni poznane. W pracy badano czy u sroki — gatunku monomorficznego — barwy strukturalne mogą funkcjonować jako sygnał niosący informację o wieku, płci oraz o tym, czy osobnik posiada terytorium. Ptaki chwytano i znakowano indywidualnie, określano wiek (osobniki młode — z danego sezonu lęgowego oraz starsze), a w kolejnym sezonie, czy zajęły i utrzymały terytorium lęgowe. Przeprowadzono pomiary spektrofotometryczne białych barkówek, niebieskawo opalizujących lotek drugorzędowych oraz zielonkawo opalizującego upierzenia ogona, jak również określono wielkość białej plamy na barkówkach (Tab. 1, Fig. 1). Płeć ptaków oznaczono molekularnie. Stwierdzono znaczące różnice w barwach wszystkich mierzonych części upierzenia w zależności od wieku — osobniki starsze miały pióra jaskrawsze, o żywszych i bardziej nasyconych barwach niż młode (Tab. 1, Tab. 2). Różnice między samcami i samicami oraz pomiędzy posiadaczami terytorium i osobnikami nieterytorialnymi stwierdzono tylko w barwach sterówek. Wielkość białych plam na barkówkach nie wykazywała związku z płcią lub wiekiem ptaków (Tab. 1, Tab. 2). Wyniki wskazują, że barwy strukturalne mogą ułatwiać ptakom zarówno rozpoznawanie płci (co ułatwia łączenie się w pary), jak i status socjalny (zmniejszając szansę zachowań antagonistycznych). Wysokie wskaźniki barw sterówek, szczególnie u samców, są zgodne z wcześniejszymi sugestiami, że u gatunków ptaków o stosunkowo długich ogonach, jego cechy stanowią sygnał jakości osobnika.

Słowa kluczowe

EN

bird; structural colour; iridescence; animal age; animal sex; territory ownership; Eurasian Magpie; Common Magpie zob.Eurasian Magpie; Magpie; Pica pica; sexual dichromatism

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2016
• Tom: 51
• Numer: 1
• Opis fizyczny: p.83-92,fig.,ref.

Twórcy

autor

Nam H.-Y.

• Laboratory of Behavioral Ecology and Evolution, School of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea

autor

Lee S.-I.

• Laboratory of Behavioral Ecology and Evolution, School of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea
• Institute of Advanced Machinery and Design, Seoul National University, Seoul 08826, Republic of Korea

autor

Lee J.

• Laboratory of Behavioral Ecology and Evolution, School of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea

autor

Choi C.-Y.

• Laboratory of Wildlife Ecology and Management, Department of Forest Sciences, Seoul National University, Seoul 08826, Republic of Korea

autor

Choe J.C.

• Laboratory of Behavioral Ecology and Evolution, School of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea
• Laboratory of Behavior and Ecology, Division of EcoScience, Ewha Womans University, Seoul 03760, Republic of Korea
• National Institute of Ecology, Chungchungnam-do Seocheon-gun 33657, Republic of Korea

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Identyfikatory

DOI

10.3161/00016454AO2016.51.1.007