Male expulsion in cooperative Mongolian gerbils (Meriones unguiculatus)

E Scheibler*, René Weinandy, Rolf Gattermann

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Mongolian gerbils are territorial rodents of steppes and semideserts of Mongolia and Northern China. At least under laboratory conditions, the family life is characterized by long-term harmonious and short-term aggressive periods in which some members are expelled. The purpose of this study was to clarify which features of male offspring promote their expulsion. Therefore body mass, absolute and relative weight of testes and epididymis, histology of testes and testosterone concentrations were analyzed in males derived from five families living in semi-natural enclosures with food and water ad libitum. Males expelled (EFM, n = 40) had significantly higher relative testes and relative epididymis weight and higher testosterone concentrations in harmonious periods than it did non-attacked ones (IFM, n = 13). A stepwise discriminant analysis has established the relative testes weight as decisive for the affiliation to EFM or IFM. Based on this parameter, 71.7% of the offspring could be classified correctly. Moreover, histological results showed that 50.0% of integrated and 29.4% of the expelled family members had incomplete spermiogenesis, indicating a reduced fertility. It is concluded, that males do compete for reproduction within the families which triggers the expulsion of the males with the highest reproductive capacity. (c) 2005 Elsevier Inc. All rights reserved.

    Original languageEnglish
    Pages (from-to)24-30
    Number of pages7
    JournalPhysiology & Behavior
    Volume87
    Issue number1
    DOIs
    Publication statusPublished - 30 Jan 2006

    Keywords

    • aggression
    • reproductive competition
    • spermiogenesis
    • expulsion
    • SPERM COMPETITION
    • REPRODUCTIVE SUCCESS
    • TESTOSTERONE LEVELS
    • FECAL TESTOSTERONE
    • SOCIAL-DOMINANCE
    • TESTIS SIZE
    • AGGRESSION
    • BEHAVIOR
    • MAMMALS
    • NEST

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