Data from: Sex ratio of Western Bluebirds Sialia mexicana is mediated by phenology and clutch size

Andrew Bartlow, Mark Jankowski, Charles Hathcock, Randall Ryti, Steven Reneau & Jeanne Fair
Mothers may produce more of one sex to maximize their fitness if there are differences in the cost of producing each sex or there are differences in their relative reproductive value. We tested if breeding date, clutch size and drought conditions influenced offspring sex ratios in Western Bluebirds (Sialia mexicana) from 1997 to 2017. We found that hatch dates late in the breeding season were associated with the production of more females. When clutch size...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
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