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Article

Disentangling the effect of genes, the environment and chance on sex ratio variation in a wild bird population.

Proceedings. Biological sciences - 7 Oct 2011

Postma Erik, Heinrich Franziska, Koller Ursina, Sardell Rebecca J, Reid Jane M, Arcese Peter, Keller Lukas F

Abstract excerpt

Sex ratio theory proposes that the equal sex ratio typically observed in birds and mammals is the result of natural selection. However, in species with chromosomal sex determination, the same 1 : 1 sex ratio is expected under random Mendelian segregation. Here, we present an analysis of 14 years of sex ratio data for a population of song sparrows (Melospiza melodia) on Mandarte Island, at the nestling stage and...

Topics

Animals
Ecosystem
Female
Genetic Variation
Male
Sex Ratio
Sparrows

Source

Methodology Data sources Editorial policy Privacy About Contact Helena Bioinformatics

Identifiers

PMID: 21345862
DOI: 10.1098/rspb.2010.2763
PMCID: PMC3151710

Provenance

PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 29 Aug 2026. Prepared record publication-21345862-2026-08-29.1. Manifest publication-graph-cohort-2026-08-29.1.

Source receipt: PubMed via Helena Literature Corpus, retrieved 29 Aug 2026.

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