Advanced Search
MyIDEAS: Login

Viability of Small Populations Experiencing Recurring Catastrophes

Contents:

Author Info

  • PETER JAGERS
  • KARIN HARDING
Registered author(s):

    Abstract

    Some small populations are characterized by periods of exponential growth interrupted by sudden drops. These drops can be linked to the population size itself, for example, through overexploitation of local resources. The long-term population extinction risk and the time to extinction for such a repeatedly collapsing population are estimated from general branching processes. The latter allows realistic modeling of lifespan distributions and reproduction patterns, litter (or brood or clutch) sizes as long as individuals reproduce freely and density effects are absent. As the population grows, the carrying capacity of the habitat increasingly matters. This is modeled as a drop after reaching a ceiling. The probability of recovery is then determined by the population size after the drop and by the risk of extinction of branching processes. The reproductive behavior of individuals during the periods free of density effects determines the intrinsic rate of increase of populations close to the carrying capacity. The details of life history which produce demographic stochasticity remain important in systems with density effects. Finally, the time to extinction of a single system with a high carrying capacity is compared to that of a population distributed over several small patches. For systems not allowing migration, survival is favored by a single large habitat rather than by several small habitats.

    Download Info

    If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.
    File URL: http://www.tandfonline.com/doi/abs/10.1080/08898480903034694
    Download Restriction: Access to full text is restricted to subscribers.

    As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.

    Bibliographic Info

    Article provided by Taylor & Francis Journals in its journal Mathematical Population Studies.

    Volume (Year): 16 (2009)
    Issue (Month): 3 ()
    Pages: 177-198

    as in new window
    Handle: RePEc:taf:mpopst:v:16:y:2009:i:3:p:177-198

    Contact details of provider:
    Web page: http://www.tandfonline.com/GMPS20

    Order Information:
    Web: http://www.tandfonline.com/pricing/journal/GMPS20

    Related research

    Keywords: branching processes; carrying capacity; density dependent catastrophes; survival time;

    References

    No references listed on IDEAS
    You can help add them by filling out this form.

    Citations

    Lists

    This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.

    Statistics

    Access and download statistics

    Corrections

    When requesting a correction, please mention this item's handle: RePEc:taf:mpopst:v:16:y:2009:i:3:p:177-198. 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: (Michael McNulty).

    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.

    If references are entirely missing, you can add them using this form.

    If the full references list an item that is present in RePEc, but the system did not link to it, you can help with 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 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.