title: Theoretical considerations of Fisher's theorem in small at-risk populations.
abstract: Small populations at risk of extinction due to threshold or competitive exclusion have a vested interest in rapid growth. Taking chance of survival into account for diploid populations, Fisher's theorem predicts a sex ratio favoring females under certain circumstances. Theoretical consideration of competitive exclusion shows such circumstances are reasonable under accepted modeling assumptions.
authors.affiliation: Department of Mathematics and Statistics, Williams College, Williamstown, MA 01267, USA. sjohnson@williams.edu
authors.forename: Stewart D
authors.initials: SD
authors.lastname: Johnson
mesh_terms: D000818:Animals; D053476:Extinction, Biological; D005260:Female; D008297:Male; D008954:Models, Biological; D011157:Population Dynamics; D012744:Sex Ratio