Among ray-finned fishes that provide parental care, many spawn in constructed nests,
ranging from bowls, burrows and ridges to nests made of algae or bubbles. Because a nest …

Routine assessments of overall sexual selection, including comparisons of its direction and
intensity between sexes or species, rely on summary metrics that capture the essence of …

Sexual selection is a cornerstone of evolutionary theory, but measuring it has proved
surprisingly difficult and controversial. Various proxy measures—eg, the Bateman gradient …

Sexual selection is a potent evolutionary force that has been shown to vary in strength and
direction depending on demographic factors such as density and sex ratio. However, the …

Bateman's principles posit that male fitness varies more, and relies more on mate
acquisition, than female fitness. While Bateman's principles should apply to any organism …

Our understanding of sexual selection has greatly improved during the last decades. The
focus is no longer solely on males, but also on how female competition and male mate …

ABSTRACT The Darwin–Bateman paradigm predicts that females enhance their fitness by
being choosy and mating with high‐quality males, while males should compete to mate with …

Spatial and temporal variation in environmental factors and the social setting can help to
maintain genetic variation in sexually selected traits if it affects the strength of directional …

Sexual selection is generally predicted to act more strongly on males than on females. The
Darwin-Bateman paradigm predicts that this should also hold for hermaphrodites. However …

Highlights•The opportunity for sexual selection changes throughout a breeding season.•The
advantage conferred by body size depends on the operational sex ratio.•The timing of …