TY - JOUR
T1 - The adaptive value of male-biased sex ratios in stressed animals
AU - MCGINLEY, Mark, Alan
PY - 1984/10/1
Y1 - 1984/10/1
N2 - The question of adaptive sex ratio manipulation in higher vertebrates remains a controversial issue. Trivers and Willard (1973) proposed that facultative adjustment of the sex ratio could be adaptive when the mother can produce an excess of the more profitable sex. They emphasized that "natural selection should favor parental ability to adjust the sex ratio of their offspring according to their ability to invest" (p. 90). Generally, it has been assumed that strong mothers invest more per offspring, and should preferentially produce males in species with polygynous or promiscuous mating systems. Conversely, it has been assumed that weak females invest less per offspring, and should therefore bias their offspring sex ratio toward females.
AB - The question of adaptive sex ratio manipulation in higher vertebrates remains a controversial issue. Trivers and Willard (1973) proposed that facultative adjustment of the sex ratio could be adaptive when the mother can produce an excess of the more profitable sex. They emphasized that "natural selection should favor parental ability to adjust the sex ratio of their offspring according to their ability to invest" (p. 90). Generally, it has been assumed that strong mothers invest more per offspring, and should preferentially produce males in species with polygynous or promiscuous mating systems. Conversely, it has been assumed that weak females invest less per offspring, and should therefore bias their offspring sex ratio toward females.
UR - http://www.jstor.org/stable/2461600
UR - http://commons.ln.edu.hk/sw_master/4759
M3 - Journal Article (refereed)
VL - 124
SP - 597
EP - 599
JO - American Naturalist
JF - American Naturalist
SN - 0003-0147
IS - 4
ER -