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Title of Journal: Behav Ecol Sociobiol

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Abbravation: Behavioral Ecology and Sociobiology

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Springer-Verlag

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DOI

10.1007/s11745-999-0477-2

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1432-0762

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Secondary sex ratios do not support maternal manip

Authors: Marcela Nováková Barbora Vašáková Hana Kutalová Katarina Galeštoková Klára Průšová Petr Šmilauer Radim Šumbera Daniel Frynta
Publish Date: 2009/10/06
Volume: 64, Issue: 3, Pages: 371-379
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Abstract

Spiny mice of the genus Acomys Muridae represent a very suitable mammalian model for studying factors influencing the secondary sex ratio SSR The maternal effort in these rodents is extremely biased in favour of the prenatal period and therefore maternal manipulation of the SSR is potentially more advantageous We studied the SSR in four populations/species of spiny mice kept in family groups consisting of two closely related females one nonrelative male and their descendants The groups were established from founding animals aged about 3 months maturing age and were allowed to breed freely for several months Each litter was sexed after birth and relevant data were thoroughly recorded Altogether data were collected on 1684 litters 189 of Acomys sp from Iran 203 of A cilicicus 875 of A cahirinus and 417 of A dimidiatus We recorded the sex of 4048 newborns of which 1995 were males and 2053 were females The overall sex ratio was close to 11 492 Generalized linear mixed models and/or generalized linear models were constructed to evaluate the effect of four life history and eight social variables on the sex ratio No consistent effects of these variables on the sex ratio were found and interestingly none of the variables associated with maternal life history had any effect on the sex ratio Three factors associated with group composition ie the number of immature males the number of immature females and the number of breeding females did have significant effects on the sex ratio but these effects were not consistent across the studied species In conclusion our evaluation of this large dataset revealed that the sex ratio in spiny mice is surprisingly stableWe thank J Sádlová L Schwarzová P Kunzová J Flegr M Kaftan and J Borek for their help in collecting ancestral stocks of spiny mice We are grateful to Marco FestaBianchet and two anonymous reviewers for their helpful comments on earlier versions of the manuscriptThe project was supported by the Grant Agency of the Czech Academy of Sciences project no IAA6111410 Ministry of Education of the Czech Republic MSMT 6007665801 and Grant Agency of the University of South Bohemia project no GAJU 39/2007 The personal costs of MN were covered from grant no 206/05/H012 provided by The Grant Agency of the Czech Republic

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