Du är här

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

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor: 925-934
Publikation/Tidskrift/Serie: Journal of Animal Ecology
Volym: 73
Nummer: 5
Dokumenttyp: Artikel
Förlag: Blackwell Publishing

Sammanfattning

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.

Disputation

Nyckelord

  • Biology and Life Sciences

Övrigt

Published
Yes
  • Molecular Ecology and Evolution Lab
  • ISSN: 0021-8790

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen

LERU logo U21 logo