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  1. Artikel: Melanin-based ornament darkness positively correlates with across-season nutritional condition.

    Hegyi, Gergely / Laczi, Miklós / Kötél, Dóra / Csörgő, Tibor

    Ecology and evolution

    2020  Band 10, Heft 23, Seite(n) 13087–13094

    Abstract: Sexually dimorphic ornamental traits are widely regarded as indicators of nutritional condition. However, variation of nutritional condition outside the reproductive and the ornament production seasons has rarely been considered, although it affects the ... ...

    Abstract Sexually dimorphic ornamental traits are widely regarded as indicators of nutritional condition. However, variation of nutritional condition outside the reproductive and the ornament production seasons has rarely been considered, although it affects the generality of information content, especially for ornaments that may be used across the year. We measured several indicators of migratory and molt condition in male and female blackcaps (
    Sprache Englisch
    Erscheinungsdatum 2020-10-12
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2635675-2
    ISSN 2045-7758
    ISSN 2045-7758
    DOI 10.1002/ece3.6898
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel: Triparental care in the collared flycatcher (

    Laczi, Miklós / Kopena, Renáta / Sarkadi, Fanni / Kötél, Dóra / Török, János / Rosivall, Balázs / Hegyi, Gergely

    Ecology and evolution

    2021  Band 11, Heft 16, Seite(n) 10754–10760

    Abstract: Certain predominant forms of mating and parental care systems are assumed in several model species among birds, but the opportunistic and apparently infrequent variations of "family structures" may often remain hidden due to methodological limitations ... ...

    Abstract Certain predominant forms of mating and parental care systems are assumed in several model species among birds, but the opportunistic and apparently infrequent variations of "family structures" may often remain hidden due to methodological limitations with regard to genetic or behavioral observations. One of the intensively studied model species, the collared flycatcher (
    Sprache Englisch
    Erscheinungsdatum 2021-07-28
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2635675-2
    ISSN 2045-7758
    ISSN 2045-7758
    DOI 10.1002/ece3.7923
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Direct benefits of mate choice: a meta-analysis of plumage colour and offspring feeding rates in birds.

    Hegyi, Gergely / Kötél, Dóra / Laczi, Miklós

    Die Naturwissenschaften

    2015  Band 102, Heft 9-10, Seite(n) 62

    Abstract: Mate choice is generally costly to the choosy sex, so fitness benefits must counterbalance these costs. Genetic benefits of choice are widely examined and have received overall support. Direct benefits such as high quality parental care by highly ... ...

    Abstract Mate choice is generally costly to the choosy sex, so fitness benefits must counterbalance these costs. Genetic benefits of choice are widely examined and have received overall support. Direct benefits such as high quality parental care by highly ornamented individuals are widely assumed to be important but are less frequently tested, theoretically debated, and their support in the recent literature is unknown. Furthermore, in taxa where both sexes provide care, the preferential investment of the partner in relation to ornamentation may reduce own investment and modify apparent parental care quality. In a phylogenetically controlled meta-analysis, we collated correlative results from birds concerning parental plumage coloration and the nestling feeding rates of the ornament bearer and its partner. Overall evidence was weak for signalling of parental care quality and somewhat stronger for preferential partner investment. Surprisingly, the sex of the signaller and the type of plumage colour seemed to exert weak effects on the signalling of parental care quality. Finally, there was a group of cases with opposite relationships of care and ornamentation in the two parties. We found that this group arose predominately from preferential partner investment in relation to ornamentation, with concomitant, but weaker, reduction of own investment. We conclude that the effect of partner investment on parental care indication seems system-specific and needs further study.
    Mesh-Begriff(e) Animals ; Birds/classification ; Birds/physiology ; Feathers/physiology ; Feeding Behavior/physiology ; Female ; Male ; Maternal Behavior ; Paternal Behavior ; Phylogeny ; Pigmentation/physiology ; Sex Characteristics ; Sexual Behavior, Animal
    Sprache Englisch
    Erscheinungsdatum 2015-10
    Erscheinungsland Germany
    Dokumenttyp Journal Article ; Meta-Analysis ; Research Support, Non-U.S. Gov't
    ZDB-ID 123257-5
    ISSN 1432-1904 ; 0028-1042
    ISSN (online) 1432-1904
    ISSN 0028-1042
    DOI 10.1007/s00114-015-1311-6
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel: Stable correlation structure among multiple plumage colour traits: can they work as a single signal?

    Hegyi, Gergely / Laczi, Miklós / Nagy, Gergely / Szász, Eszter / Kötél, Dóra / Török, János

    Biological journal of the Linnean Society. 2015 Jan., v. 114, no. 1

    2015  

    Abstract: The presence of multiple distinct ornamental traits in the same species is frequently explained by context‐specificity and different information content. However, the expression of multiple ornaments is often correlated, and such traits may therefore ... ...

    Abstract The presence of multiple distinct ornamental traits in the same species is frequently explained by context‐specificity and different information content. However, the expression of multiple ornaments is often correlated, and such traits may therefore function as a single, integrated signal. Delayed use of an integrated signal relative to production requires temporal stability in integration, which has seldom been examined. We used autumn and spring reflectance data from the breast, breast stripe, and crown of great tits (Parus major) to assess the stability and mating implications of colour signal integration, as well as the repeatability of any integrated colour trait and its correlation with condition during moult. We found high levels of stability between seasons, years, sexes, and ages in the correlation patterns of colour measures across the three plumage areas. The first principal component colour axis described joint variation of ultraviolet (UV) reflectance on the crown and the breast stripe, thereby representing an among‐trait UV chroma axis. However, only breast yellow chroma showed condition‐dependence, whereas temporally consistent and significant assortative mating was restricted to crown UV chroma. Our results therefore do not support the idea that the overall UV chroma of the breast stripe and the crown is special in condition‐dependence and repeatability, or that it plays a specific role in mutual sexual selection as an integrated signal. The results show that stable association between display traits is an existing phenomenon. They also indicate that, even in the presence of correlated traits, functional trait integration among these requires further scrutiny. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society, 2014, 114, 92–108.
    Schlagwörter Parus major ; assortative mating ; autumn ; color ; molting ; ornamental value ; plumage ; reflectance ; sexual selection ; spring
    Sprache Englisch
    Erscheinungsverlauf 2015-01
    Umfang p. 92-108.
    Erscheinungsort Published for the Linnean Society of London by Blackwell [etc.]
    Dokumenttyp Artikel
    ZDB-ID 1461865-5
    ISSN 1095-8312 ; 0024-4066
    ISSN (online) 1095-8312
    ISSN 0024-4066
    DOI 10.1111/bij.12412
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel ; Online: Reflectance variation in the blue tit crown in relation to feather structure.

    Hegyi, Gergely / Laczi, Miklós / Kötél, Dóra / Csizmadia, Tamás / Lőw, Péter / Rosivall, Balázs / Szöllősi, Eszter / Török, János

    The Journal of experimental biology

    2018  Band 221, Heft Pt 9

    Abstract: Structural plumage colour is one of the most enigmatic sexually selected traits. The information content of structural colour variation is debated, and the heterogeneity of the findings is hard to explain because the proximate background of within- ... ...

    Abstract Structural plumage colour is one of the most enigmatic sexually selected traits. The information content of structural colour variation is debated, and the heterogeneity of the findings is hard to explain because the proximate background of within-species colour differences is very scarcely studied. We combined measurements of feather macrostructure and nanostructure to explain within-population variability in blue tit crown reflectance. We found that sexual dichromatism in aspects of crown reflectance was explained only by feather macrostructure, whereas nanostructural predictors accounted for some of the age-related differences in reflectance. Moreover, we found that both mean reflectance and spectral shape traits reflected a combination of quantity and regularity aspects in macrostructure and nanostructure. This rich proximate background provides ample scope for reflectance to convey various types of information on individual quality.
    Mesh-Begriff(e) Animals ; Color ; Feathers/chemistry ; Female ; Male ; Phenotype ; Pigmentation ; Songbirds/physiology
    Sprache Englisch
    Erscheinungsdatum 2018-05-10
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218085-6
    ISSN 1477-9145 ; 0022-0949
    ISSN (online) 1477-9145
    ISSN 0022-0949
    DOI 10.1242/jeb.176727
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel: Ornaments and condition: plumage patch sizes, nutritional reserve state, reserve accumulation, and reserve depletion

    Hegyi, Gergely / Jenni-Eiermann, Susanne / Boross, Nóra / Garamszegi, László Zsolt / Laczi, Miklós / Kötél, Dóra / Krenhardt, Katalin / Jablonszky, Mónika / Markó, Gábor / Nagy, Gergely / Rosivall, Balázs / Szász, Eszter / Török, János

    Behavioral ecology and sociobiology. 2019 June, v. 73, no. 6

    2019  

    Abstract: Condition-dependence is considered as a dominant mechanism ensuring the fitness benefits of continued mate choice for heritable sexual signal traits, but crucial questions remain concerning the underlying physiological pathways. For example, it is ... ...

    Abstract Condition-dependence is considered as a dominant mechanism ensuring the fitness benefits of continued mate choice for heritable sexual signal traits, but crucial questions remain concerning the underlying physiological pathways. For example, it is unclear whether condition-dependence is mediated by the different amount of resource obtained, some uncheatable functional link with nutritional status, or the adverse effect of nutritional stress experienced by some individuals. Furthermore, the pattern of change in nutritional reserves in relation to ornamental traits has recently been proposed as a critical pillar of the condition-dependence concept, but this pattern is virtually unknown in natural populations. We quantified separate measures for actual body condition, lipid reserve accumulation rate, and lipid reserve depletion, and applied these measures to two white plumage ornaments of male collared flycatchers during courtship, during nestling rearing, and before the summer moult. Neither actual condition nor reserve accumulation rate before moult predicted the subsequent change of ornament sizes, but reserve depletion was accompanied by the reduction of forehead patch size to the following year. Wing patch size, a trait important in territoriality, was negatively related to both reserve accumulation and reserve depletion in the courtship period, but not related to current condition. Finally, irrespective of breeding phase, measures of current condition, and recent nutritional reserve depletion were negatively correlated, but both were unrelated to resource accumulation rate. These results indicate that measuring nutritional reserve trajectories in addition to actual condition may reveal functionally important processes underlying signal-condition correlations. SIGNIFICANCE STATEMENT: Ornamental signal characters are known to convey honest information to signal receivers through their dependence on nutritional condition. Here, we show that such signals can also indicate the temporal trends of condition. We examine plumage patch sizes and separate measures of actual condition, nutritional reserve accumulation, and nutritional reserve depletion in three contexts: during courtship, during nestling rearing, and before the summer moult. The results suggest nutritional stress effects on signal expression, and predictable reserve dynamics in relation to signal expression, thereby highlighting the usefulness of dynamic nutritional measures in clarifying the fundamental concept of condition-dependent signalling.
    Schlagwörter Ficedula albicollis ; adverse effects ; body condition ; breeding ; courtship ; lipids ; males ; malnutrition ; molting ; nestlings ; nutritional status ; ornamental value ; plumage ; rearing ; summer ; territoriality
    Sprache Englisch
    Erscheinungsverlauf 2019-06
    Umfang p. 89.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 194510-5
    ISSN 1432-0762 ; 0340-5443
    ISSN (online) 1432-0762
    ISSN 0340-5443
    DOI 10.1007/s00265-019-2701-0
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel: Direct benefits of mate choice: a meta-analysis of plumage colour and offspring feeding rates in birds

    Hegyi, Gergely / Kötél, Dóra / Laczi, Miklós

    Naturwissenschaften

    Band v. 102,, Heft no. 9

    Abstract: Mate choice is generally costly to the choosy sex, so fitness benefits must counterbalance these costs. Genetic benefits of choice are widely examined and have received overall support. Direct benefits such as high quality parental care by highly ... ...

    Abstract Mate choice is generally costly to the choosy sex, so fitness benefits must counterbalance these costs. Genetic benefits of choice are widely examined and have received overall support. Direct benefits such as high quality parental care by highly ornamented individuals are widely assumed to be important but are less frequently tested, theoretically debated, and their support in the recent literature is unknown. Furthermore, in taxa where both sexes provide care, the preferential investment of the partner in relation to ornamentation may reduce own investment and modify apparent parental care quality. In a phylogenetically controlled meta-analysis, we collated correlative results from birds concerning parental plumage coloration and the nestling feeding rates of the ornament bearer and its partner. Overall evidence was weak for signalling of parental care quality and somewhat stronger for preferential partner investment. Surprisingly, the sex of the signaller and the type of plumage colour seemed to exert weak effects on the signalling of parental care quality. Finally, there was a group of cases with opposite relationships of care and ornamentation in the two parties. We found that this group arose predominately from preferential partner investment in relation to ornamentation, with concomitant, but weaker, reduction of own investment. We conclude that the effect of partner investment on parental care indication seems system-specific and needs further study.
    Schlagwörter meta-analysis ; progeny ; color ; phylogeny ; mating behavior ; plumage ; birds
    Sprache Englisch
    Dokumenttyp Artikel
    ISSN 0028-1042
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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  8. Artikel: Stable correlation structure among multiple plumage colour traits: can they work as a single signal?

    Hegyi, Gergely / Laczi, Miklós / Nagy, Gergely / Szász, Eszter / Kötél, Dóra / Török, János

    Biological journal of the Linnean Society

    Band v. 114,, Heft no. 1

    Abstract: The presence of multiple distinct ornamental traits in the same species is frequently explained by context‐specificity and different information content. However, the expression of multiple ornaments is often correlated, and such traits may therefore ... ...

    Abstract The presence of multiple distinct ornamental traits in the same species is frequently explained by context‐specificity and different information content. However, the expression of multiple ornaments is often correlated, and such traits may therefore function as a single, integrated signal. Delayed use of an integrated signal relative to production requires temporal stability in integration, which has seldom been examined. We used autumn and spring reflectance data from the breast, breast stripe, and crown of great tits (Parus major) to assess the stability and mating implications of colour signal integration, as well as the repeatability of any integrated colour trait and its correlation with condition during moult. We found high levels of stability between seasons, years, sexes, and ages in the correlation patterns of colour measures across the three plumage areas. The first principal component colour axis described joint variation of ultraviolet (UV) reflectance on the crown and the breast stripe, thereby representing an among‐trait UV chroma axis. However, only breast yellow chroma showed condition‐dependence, whereas temporally consistent and significant assortative mating was restricted to crown UV chroma. Our results therefore do not support the idea that the overall UV chroma of the breast stripe and the crown is special in condition‐dependence and repeatability, or that it plays a specific role in mutual sexual selection as an integrated signal. The results show that stable association between display traits is an existing phenomenon. They also indicate that, even in the presence of correlated traits, functional trait integration among these requires further scrutiny. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society, 2014, 114, 92–108.
    Schlagwörter sexual selection ; assortative mating ; color ; autumn ; plumage ; molting ; Parus major ; spring ; reflectance ; ornamental value
    Sprache Englisch
    Dokumenttyp Artikel
    ISSN 0024-4066
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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