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Time to extinction in relation to mating system and type of density regulation in populations with two sexes

  1. BERNT-ERIK SÆTHER1,*,
  2. STEINAR ENGEN2,
  3. RUSSELL LANDE3,
  4. ANDERS PAPE MØLLER4,
  5. STAFFAN BENSCH5,
  6. DENNIS HASSELQUIST5,
  7. JOSEF BEIER6,
  8. BERND LEISLER6

Article first published online: 18 AUG 2004

DOI: 10.1111/j.0021-8790.2004.00869.x

Issue

Journal of Animal Ecology

Journal of Animal Ecology

Volume 73, Issue 5, pages 925–934, September 2004

Additional Information

How to Cite

SÆTHER, B.-E., ENGEN, S., LANDE, R., MØLLER, A. P., BENSCH, S., HASSELQUIST, D., BEIER, J. and LEISLER, B. (2004), Time to extinction in relation to mating system and type of density regulation in populations with two sexes. Journal of Animal Ecology, 73: 925–934. doi: 10.1111/j.0021-8790.2004.00869.x

Author Information

  1. 1

    Institute for Biology, Norwegian University of Science and Technology, Realfagsbygget, N-7491 Trondheim, Norway;

  2. 2

    Department of Mathematical Sciences, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;

  3. 3

    Division of Biology 0116, University of California at San Diego, La Jolla, CA 92093, USA;

  4. 4

    Laboratoire Parasitologie Evolutive, CNRS UMR 7103, Université Pierre et Marie Curie, Bat. A, 177, quai St Bernard, Case 237, F-75252 Paris Cedex 5, France;

  5. 5

    Department of Animal Ecology, Ecology Building, Lund University, S-223 62 Lund, Sweden; and

  6. 6

    Max Planck Research Centre for Ornithology, Vogelwarte Radolfzell, Schlossallee 2, D-78315 Radolfzell, Germany

* Bernt-Erik Sæther, Institute for Biology, Norwegian University of Science and Technology, Realfagsbygget, N-7491 Trondheim, Norway. Fax: +4773591309; E-mail: Bernt-Erik.Sather@bio.ntnu.no

Publication History

  1. Issue published online: 18 AUG 2004
  2. Article first published online: 18 AUG 2004
  3. Received 24 June 2003; accepted 12 February 2004

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Keywords:

  • demographic stochasticity;
  • density regulation;
  • mating system;
  • sex-specific population dynamics;
  • great reed warbler

Summary

  • 1
    Population viability models usually consider only the female segment of the population. However, random variation in sex ratio as well as the mating system may also affect variation in fitness among females. Here we develop population models incorporating demographic stochasticity in both sexes. Furthermore, we consider the effects on the estimated time to extinction and whether density regulation acts only on females or on total population size.
  • 2
    We applied these models to two populations of polygynous great reed warblers Acrocephalus arundinaceus L. with differences in population trends to investigate the importance of considering sex in population viability models.
  • 3
    Demographic stochasticity was larger in a polygynous than in a monogamous mating system.
  • 4
    The estimated time to extinction was considerably shorter for a monogamous than for a polygynous mating system, particularly if density regulation acted only on females than rather on the total population.
  • 5
    This study demonstrates that structure of mating system must be included when making population viability analysis based on counts of total population sizes. It is especially important to model the specific effects of density regulation on the two sexes.
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