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Inbreeding depression in the wild.

P Crnokrak1, D A Roff

  • 1Department of Biology, McGill University, 1205 Docteur Penfield Ave., Montreal, Quebec, Canada H3A 1B1. crnokrak@bio1.lan.mcgill.ca

Heredity
|October 3, 1999
PubMed
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The cost of inbreeding in wild populations is often high and biologically significant. Inbred wild species frequently show moderate to high inbreeding depression in fitness traits.

Area of Science:

  • Ecology and Evolutionary Biology
  • Conservation Biology

Background:

  • The cost of inbreeding in natural populations is poorly understood.
  • Inbreeding depression (delta) is a critical factor in evolutionary and conservation biology.

Purpose of the Study:

  • To compile and analyze existing estimates of inbreeding depression in wild species.
  • To compare inbreeding depression in wild versus captive animal populations.

Main Methods:

  • Literature review of field-monitored wild species.
  • Data compilation of inbreeding depression (delta) and inbreeding coefficient (F).
  • Statistical comparison of inbreeding depression estimates between wild and captive mammals.

Main Results:

  • Mean inbreeding depression (delta) for homeotherms (0.509), poikilotherms (0.201), and plants (0.331).

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  • Wild mammal inbreeding depression estimates were significantly higher than captive estimates (2.155 vs. 0.314 at F=0.25).
  • 90 out of 169 estimates showed significant inbreeding depression in wild species.

    • Conclusions:

    • Inbreeding depression is a significant factor affecting fitness in wild populations.
    • Wild species exhibit higher inbreeding depression costs than captive species.
    • Inbreeding poses a substantial threat to the viability of natural populations.