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Climate and maternal effects modify sex ratios in a weakly dimorphic marsupial

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dc.contributor Australian Institute Of Marine Science
dc.contributor Sch Earth & Environm Sci
dc.contributor James Cook Univ
dc.contributor University Of Adelaide
dc.contributor Australian Inst Marine Sci
dc.contributor Univ Adelaide
dc.contributor Inst Environm
dc.contributor James Cook University
dc.contributor Australian Institute Of Marine Science (aims) en MARSH, HELENE DELEAN, STEVEN DE'ATH, GLENN 2017-03-21T00:54:49Z 2017-03-21T00:54:49Z 2013-02-28T06:45:23Z 2019-05-09T01:18:11Z 2013-02-28T06:45:23Z 2013-02-28T06:45:23Z 2017-03-21T00:54:49Z 2019-05-09T01:18:11Z 2009-12-01
dc.identifier 8400 en
dc.identifier.citation Delean S, De'ath AG and Marsh H (2009) Climate and maternal effects modify sex ratios in a weakly dimorphic marsupial. Behavioural Ecology and Sociobiology. 64: 265-277. en
dc.identifier.issn 0340-5443
dc.description Link to abstract/full text - en
dc.description.abstract There is growing evidence that the sex ratios of wild vertebrate populations are determined by mechanisms that are directly influenced by environmental characteristics. The Trivers-Willard (TWH) and extrinsic modification (EMH) hypotheses postulate differing determinants of mammalian offspring sex ratios. TWH states that mothers allocate resources according to their current condition and sex-specific offspring costs. EMH states that environmental forces that affect maternal condition determine offspring sex ratios, independently of maternal tactics of sex-biased allocation. We statistically assessed support for each of these hypotheses using long-term life histories of the allied rock-wallaby, Petrogale assimilis; a continuously breeding, polygynous, weakly dimorphic marsupial. We showed that birth sex ratios were equal and independent of maternal and environmental conditions. However, secondary sex ratios were male-biased under good environmental conditions and for high quality mothers or mothers in good condition. Sex differences in offspring survival contributed to these biases: (1) environmental conditions strongly influenced survival to pouch emergence (in support of EMH) and (2) maternal quality affected survival to the end of maternal care (in support of TWH). Environmental effects on survival were more important than maternal factors over the entire period of maternal care and contributed most to male-biased sex ratios at pouch emergence. In contrast, maternal mass was the best predictor of sex ratios at the end of maternal care-the life history stage where offspring body mass differed between the sexes.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Behavioural Ecology and Sociobiology - pages: 64: 265-277 en
dc.relation.ispartof Null
dc.subject Allocation
dc.subject Maternal Quality
dc.subject Mammals
dc.subject Ecology
dc.subject Adjustment
dc.subject Daughters
dc.subject Behavioral Sciences
dc.subject El Nino-southern Oscillation
dc.subject Juvenile Survival
dc.subject Rock-wallaby
dc.subject Body-mass
dc.subject Macropodidae
dc.subject Environmental Sciences & Ecology
dc.subject Zoology
dc.subject Petrogale-assimilis
dc.subject Maternal Allocation
dc.subject Generalised Linear Mixed Models
dc.subject Red Deer Calves
dc.subject Investment
dc.subject Survival Analysis
dc.title Climate and maternal effects modify sex ratios in a weakly dimorphic marsupial
dc.type journal article en
dc.identifier.doi 10.1007/s00265-009-0844-0
dc.identifier.wos WOS:000271978300012

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