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

Fisher, Diana O. (1999) Offspring sex ratio variation in the bridled nailtail wallaby, Onychogalea fraenata. Behavioral Ecology and Sociobiology, 45 6: 411-419. doi:10.1007/s002650050578


Author Fisher, Diana O.
Title Offspring sex ratio variation in the bridled nailtail wallaby, Onychogalea fraenata
Journal name Behavioral Ecology and Sociobiology   Check publisher's open access policy
ISSN 0340-5443
1432-0762
Publication date 1999-05-01
Sub-type Article (original research)
DOI 10.1007/s002650050578
Volume 45
Issue 6
Start page 411
End page 419
Total pages 9
Place of publication Berlin / Heidelberg
Publisher Springer
Collection year 1999
Language eng
Subject C1
270707 Sociobiology and Behavioural Ecology
780105 Biological sciences
Abstract 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.
Keyword Behavioral Sciences
Ecology
Zoology
Onychogalea Fraenata
Macropodidae
Offspring Sex Ratio
Bridled Nailtail Wallaby
Trivers-willard Hypothesis
Maternal Investment
Elephant Seals
Red Deer
Mammals
Competition
Marsupialia
Allocation
Selection
Daughters
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Tue, 10 Jun 2008, 23:47:20 EST