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Why there is no negative correlation between egg size and number in the Common Pochard?

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081766%3A_____%2F08%3A00306971" target="_blank" >RIV/68081766:_____/08:00306971 - isvavai.cz</a>

  • Alternative codes found

    RIV/00216208:11310/08:13682 RIV/00023272:_____/08:#0000521 RIV/00216208:11310/08:13545

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Why there is no negative correlation between egg size and number in the Common Pochard?

  • Original language description

    Trade-off between offspring size and number belongs to the most discussed concepts in the life history theory. Although it has been frequently described at interspecific level as a negative correlation between egg size and number, it is usually difficultto provide similar evidence at a population level. We did not find any evidence for negative correlation between estimated egg mass and clutch size in the Common Pochard (Aythya ferina). However, the predicted negative relationship appeared after incubation when young with many siblings were on average lighter than conspecifics in nests with fewer young. Such a pattern might be generated by differences in hatching success and energy consumption by developing embryos among particular nests. Our data indicate that females which had laid clutches containing many big eggs lost a much larger amount of energy invested and, moreover, produced hatchlings of relatively lower body mass if compared with females having few small eggs.

  • Czech name

    Proč u poláka velkého neexistuje korelace mezi velikostí vejce a počtem vajec?

  • Czech description

    Vztah mezi velikostí mláděte a počtem mláďat patří k často diskutovaným tématům evoluční biologie. Ačkoliv vztah mezi velikostí vejce a počtem byl mezidruhově často dokumentován, evidence na úrovni druhu je nepřesvědčivá. V naší studii jsme nenašli vztahmezi hmotností vajec a jejich počtem u poláka velkého (Aythya farina). Nicméně tento vztah byl zjištěn u mláďat. Mláďata s mnoha sourozenci byla menší nežli ta s málo. Tento vztah může souviset s rozdíly v úspěšnosti líhnutí a rozdílné míře spotřeby energie v zárodku v době inkubace mezi jednotlivými hnízdy. Naše výsledky naznačují, že samice které investovaly hodně energie do produkce velkých snůšek s hodně velkými vejci produkovaly relativně malá mláďata.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    EG - Zoology

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2008

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Acta Oecologica-International Journal of Ecology

  • ISSN

    1146-609X

  • e-ISSN

  • Volume of the periodical

    33

  • Issue of the periodical within the volume

    2

  • Country of publishing house

    FR - FRANCE

  • Number of pages

    6

  • Pages from-to

    197-202

  • UT code for WoS article

  • EID of the result in the Scopus database