IDEAS home Printed from https://ideas.repec.org/a/oup/beheco/v22y2011i4p776-783.html
   My bibliography  Save this article

Sex-specific effects of size and condition on timing of natal dispersal in kangaroo rats

Author

Listed:
  • Andrew J. Edelman

Abstract

The effects of proximal cues in eliciting natal dispersal are predicted to vary between sexes because of differences in reproductive strategies. I examined how body mass and condition affected timing of natal dispersal in male and female banner-tailed kangaroo rats (Dipodomys spectabilis), a species that lacks sex-biased dispersal. I experimentally manipulated cues by providing additional food to a subset of offspring prior to dispersal. All supplemented offspring, regardless of sex, grew faster, were in better condition, and had higher survivorship than unsupplemented offspring. Sons who received food supplements dispersed earlier than unsupplemented sons, indicating that timing of dispersal was related to size and condition. Timing of dispersal in daughters was unaffected by resource supplementation, suggesting that size and condition are less important proximal cues. These sex-specific responses match the intersexual differences in mammalian reproductive strategies and parental investment patterns. My results support the hypothesis that sons remain at the natal territory until a certain threshold of size and condition is reached. Male reproductive success is typically dependent on body size, which affects their ability to find and defend mates. By allowing sons to remain at the natal territory until this threshold is attained, mothers likely increase the fitness of their sons. Female reproductive success is influenced more by securing resources than by body size. Thus, dispersing as early as developmentally feasible would allow daughters to secure an existing burrow system and maximize the time available for caching food prior to their first breeding attempt. Copyright 2011, Oxford University Press.

Suggested Citation

  • Andrew J. Edelman, 2011. "Sex-specific effects of size and condition on timing of natal dispersal in kangaroo rats," Behavioral Ecology, International Society for Behavioral Ecology, vol. 22(4), pages 776-783.
  • Handle: RePEc:oup:beheco:v:22:y:2011:i:4:p:776-783
    as

    Download full text from publisher

    File URL: http://hdl.handle.net/10.1093/beheco/arr050
    Download Restriction: Access to full text is restricted to subscribers.

    As the access to this document is restricted, you may want to search for a different version of it.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:oup:beheco:v:22:y:2011:i:4:p:776-783. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Oxford University Press) or (Christopher F. Baum). General contact details of provider: https://academic.oup.com/beheco .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.