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Fine-Scale Variation in Optimal Clutch Size in a Blue Tit Population.

Jorge Garrido-Bautista, Zaida Ortega, Amalia Pérez-Jiménez

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    Summary

    Blue tits adjust clutch size to maximize offspring quality. While parents can raise extra nestlings, enlarged broods lead to lower body mass, indicating optimized clutch sizes ensure high-quality fledglings.

    Keywords:
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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Ornithology

    Background:

    • Clutch size variation in birds can be adaptive if it maximizes offspring recruitment.
    • Brood size manipulation experiments help test clutch size optimization by assessing nestling condition and fitness traits.

    Purpose of the Study:

    • To test if blue tits (Cyanistes caeruleus) optimize clutch size for maximum offspring quality in different forest habitats.
    • To evaluate the impact of manipulated brood sizes on nestling morphology, physiology, and parental care.

    Main Methods:

    • Manipulated brood sizes (reduced, control, enlarged) in blue tit populations across two forest habitats.
    • Assessed nestling body mass, structural size, immune function, oxidative status, and telomere dynamics.
    • Recorded parental feeding effort and nestling diet composition.

    Main Results:

    • Nestling body mass decreased in enlarged broods, but structural size, immune system, and oxidative status remained unaffected.
    • Parents did not increase feeding effort in enlarged broods, regardless of habitat-specific clutch size differences.
    • Blue tits successfully raised extra nestlings, but at a cost to individual body mass.

    Conclusions:

    • Blue tit clutch size appears optimized at a fine scale, balancing the number of offspring with their quality.
    • The observed clutch sizes likely ensure the maximal production of high-quality fledglings in each habitat.
    • Despite raising extra young, parents did not compensate with increased feeding effort, suggesting physiological constraints or trade-offs.