Sammanfattning

Natural populations are becoming increasingly fragmented which is expected to affect their viability due to inbreeding depression, reduced genetic diversity and increased sensitivity to demographic and environmental stochasticity. In small and highly inbred populations, the introduction of only a few immigrants may increase vital rates significantly. However, very few studies have quantified the long-term success of immigrants and inbred individuals in natural populations. Following an episode of natural immigration to the isolated, severely inbred Scandinavian wolf (Canis lupus) population, we demonstrate significantly higher pairing and breeding success for offspring to immigrants compared to offspring from native, inbred pairs. We argue that inbreeding depression is the underlying mechanism for the profound difference in breeding success. Highly inbred wolves may have lower survival during natal dispersal as well as competitive disadvantage to find a partner. Our study is one of the first to quantify and compare the reproductive success of first-generation offspring from migrants vs. native, inbred individuals in a natural population. Indeed, our data demonstrate the profound impact single immigrants can have in small, inbred populations, and represent one of very few documented cases of genetic rescue in a population of large carnivores.

Nyckelord

Canis lupus; genetic rescue; heterozygosity; immigration; inbreeding; inbreeding depression

Publicerad i

Molecular Ecology
2016, Volym: 25, nummer: 19, sidor: 4745-4756
Utgivare: WILEY-BLACKWELL

SLU författare

• Åkesson, Mikael

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

• Liberg, Olof

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

• Sand, Håkan

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

Globala målen

SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald


UKÄ forskningsämne

Ekologi
Genetik


Publikationens identifierare

DOI: https://doi.org/10.1111/mec.13797

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/78348