Variation in incubation length and hatching asynchrony in Eastern Kingbirds: Weather eclipses female effects

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چکیده

Abstract Incubation length and hatching asynchrony are integral elements of the evolved reproductive strategies birds. We examined intra- interpopulation variation in both traits for Eastern Kingbird (Tyrannus tyrannus) populations from New York (NY), Kansas (KS), Oregon (OR) found that incubation were not repeatable among females, after controlling a trait, clutch size. Instead, size influenced by ambient temperature precipitation. exhibited same median (15 days) range (13–17 at all sites. Model selection results indicated periods smallest largest clutches longer NY than KS when rain was frequent throughout incubation, replacement nests, likely temperatures low during egg-laying. Full usually required 2 days (but up to 3), with synchronous associated small sizes, short periods, egg-laying period, first half incubation. Nestling starvation uncommon (5–9% nestlings monitored) greater asynchrony. These indicate while size, female contributed Kingbirds, weather source variation, especially length.

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ژورنال

عنوان ژورنال: The Auk

سال: 2021

ISSN: ['1938-4254', '0004-8038']

DOI: https://doi.org/10.1093/ornithology/ukab031