Sammanfattning

Natal dispersal is assumed to be costly. Such costs can be difficult to detect, and fitness consequences of dispersal are therefore poorly known. Because of lower phenotypic quality and/or familiarity with the environment, natal dispersers may be less buffered against a sudden increase in reproductive effort. Consequently, reproductive costs associated with natal dispersal may mostly be detected in harsh breeding conditions. We tested this prediction by comparing lifetime reproductive success between natal dispersers and non- dispersers in a patchy population of collared flycatchers (Ficedula albicollis) when they reared either a non- manipulated brood or an experimentally increased or decreased brood. Natal dispersers achieved lower lifetime reproductive success than non- dispersers only under more stressful breeding conditions (i. e. when brood size was experimentally increased). This was mostly due to a lower number of recruits produced in the year of the increase. Our results suggest a cost associated with natal dispersal paid immediately after an increase in reproductive effort and not subsequently compensated for through increased survival or future offspring recruitment. Natal dispersers adjusted their breeding investment when reproductive effort is as predicted but seemed unable to efficiently face a sudden increase in effort, which could affect the influence of environmental predictability on dispersal evolution.

Nyckelord

reproductive success; return rate; natal dispersal; reproductive effort; dispersal cost; brood size manipulation

Publicerad i

Proceedings of the Royal Society B: Biological Sciences
2017, Volym: 284, nummer: 1851, artikelnummer: 20162445

SLU författare

• Pärt, Tomas

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Ekologi


Publikationens identifierare

DOI: https://doi.org/10.1098/rspb.2016.2445

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/93663