title: Revised evidence for facultative sex ratio adjustment in birds: a correction.
abstract: We provide a revision to the calculation of effect sizes and heterogeneity statistics in our original article, 'Facultative primary sex ratio variation: a lack of evidence in birds' (Ewen et al. 2004). Our revision shows that significant heterogeneity in sex ratio study effect sizes does indeed exist and that for a series of key traits the average effect sizes (while still weak) are in fact significantly different from zero.
authors.affiliation: School of Biosciences, Birmingham University, Edgbaston B15 2TT, UK.
authors.forename: Phillip
authors.initials: P
authors.lastname: Cassey
authors.forename: John G
authors.initials: JG
authors.lastname: Ewen
authors.forename: Anders P
authors.initials: AP
authors.lastname: Møller