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Tytuł pozycji:

Offspring sex ratio variation in the bridled nailtail wallaby, Onychogalea fraenata.

Tytuł :
Offspring sex ratio variation in the bridled nailtail wallaby, Onychogalea fraenata.
Autorzy :
Fisher, Diana O.
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Temat :
ANIMAL offspring sex ratio
BRIDLED nail-tailed wallaby
AGE factors in animal behavior
ANIMAL mortality
ANIMAL sexual behavior
Źródło :
Behavioral Ecology & Sociobiology; May1999, Vol. 45 Issue 6, p411-419, 9p
Czasopismo naukowe
The bridled nailtail wallaby is a sexually size dimorphic, promiscuous, solitary macropod. Sex ratios of pouch young were studied at two sites over 3 years, beginning with 14 months of severe drought. Females that were in better condition were more likely to have sons, and condition was dependent on body size. Females at one site were heavier, were consequently in better condition, and produced more sons than females at the other site. Females that declined in condition had more daughters during the most severe part of the drought than females that maintained condition, but endoparasite infection did not affect the pouch young sex ratio. Age also appeared to affect sex ratio adjustment, because weight was strongly influenced by age. Sex ratio bias was not caused by early offspring mortality, but occurred at conception. Mothers did not appear to bias energy expenditure on sons or daughters; males and females did not differ in condition at the end of pouch life. Pouch young sex ratio variation was most consistent with the Trivers-Willard hypothesis, but could also have been influenced by local resource competition, since sons dispersed further than daughters. Offspring condition was related to survival, and was correlated with maternal condition. [ABSTRACT FROM AUTHOR]
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