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Sex-biased parasitism, seasonality and sexual size dimorphism in desert rodents

  • Population Ecology
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Abstract

We investigated seasonality of gender differences in the patterns of flea infestation in nine rodent species to test if sex-biased parasitism in terms of mean abundance, species richness, prevalence and the level of aggregation (a) varies among hosts and between seasons, and (b) is linked to sexual size dimorphism. Sexual size differences were significant in both summer and winter in Acomys cahirinus, Gerbillus pyramidum and Meriones crassus, and in winter only in Acomys russatus, Gerbillus dasyurus, Gerbillus nanus and Sekeetamys calurus. Sexual size dimorphism was male biased except for A. russatus in which it was female biased. Manifestation of sexual differences in flea infestation was different among hosts between seasons. A significant effect of sex on mean flea abundance was found in six hosts, on mean flea species richness in five hosts and on prevalence in two hosts. Male-biased parasitism was found in summer in one host only and in winter in five hosts. Female-biased parasitism occurred in winter in A. russatus. Gender differences in the slopes of the regressions of log-transformed variances against log-transformed mean abundances occurred in three hosts. No relationship was found between sexual size dimorphism and any parasitological parameter in any season using both conventional regressions and the method of independent contrasts. Our results suggest that sex-biased parasitism is a complicated phenomenon that involves several different mechanisms.

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Acknowledgements

We thank Allan Degen and three anonymous referees for helpful comments on the earlier draft of the manuscript. This study was partly supported by the Israel Science Foundation (Grant no. 249/04 to B.R.K., G. I. S. & I.S.K.). This is publication no. 187 of the Ramon Science Center and no. 491 of the Mitrani Department of Desert Ecology.

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Authors and Affiliations

  1. Ramon Science Center and Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, P.O.Box 194, Mizpe Ramon, 80600, Israel

    Boris R. Krasnov, Hadas Hawlena & Georgy I. Shenbrot

  2. Center for Biology and Management of Populations, Campus International de Baillarguet, CS, 30016 34988, Montferrier-sur-Lez cedex, France

    Serge Morand

  3. Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel

    Hadas Hawlena

  4. The Wyler Department of Dryland Agriculture, Jacob Blaustein Institutes for Desert Research, Sede Boqer Campus,  , Israel

    Irina S. Khokhlova

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  1. Boris R. Krasnov
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  2. Serge Morand
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  3. Hadas Hawlena
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  4. Irina S. Khokhlova
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  5. Georgy I. Shenbrot
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Correspondence to Boris R. Krasnov.

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Communicated by Hannu Ylonen

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Krasnov, B.R., Morand, S., Hawlena, H. et al. Sex-biased parasitism, seasonality and sexual size dimorphism in desert rodents. Oecologia 146, 209–217 (2005). https://doi.org/10.1007/s00442-005-0189-y

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