Evolution of large males is associated with female-skewed adult sex ratios in amniotes

András Liker, Veronika Bókony, Ivett Pipoly, Jean-François Lemaître, Jean-Michel Gaillard, Tamas Szekely & Robert P. Freckleton
Body size often differs between the sexes (leading to sexual size dimorphism, SSD), as a consequence of differential responses by males and females to selection pressures. Adult sex ratio (the proportion of males in the adult population, ASR) should influence SSD because ASR relates to both the number of competitors and available mates, which shape the intensity of mating competition and thereby promotes SSD evolution. However, whether ASR correlates with SSD variation among species has...
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