Tesis Doctorado
Unbiased sex dispersal in a group living rodent is driven by competitión: implicatións for kin structure and mating system
Autor
Ebensperger-P, Luis A
Faugeron, Sylvain
Pontificia Universidad Católica de Chile
Institución
Resumen
In tbe following, cbapters I examine natal dispersa! bebavior and kin structure in tbe
communal rearing rodent Octodon degu. In Cbapter II, I evaluate wbetber extrinsic
(e.g., food abundance and quality) and endogenous (e.g., cbanges in tbe breeding
activity and sex of individuals) factors affect adults borne ranges. To tbis end I radiotracked
the same individuals during two seasons (winter-summer) and in two periods
15
( one set of adult: 2005-2006, anotber set of adults: 2007-2008). I further used tbis
information (the radius oftbe maximum borne range) in Cbapter III and separated
juveniles into two categories, dispersers (moved from spring to autumn at least two
times tbe radius ofadult's borne range) or pbilopatrics. In Cbapter III, I evaluated tbe
pattern of natal dispersa! (wbetber dispersa! were sex bias) and competition at tbe
population, group and individual leve! using Capture-Mark-Recapture (C-M-R) metbod,
during tbe first step of dispersa! process (emigration). Moreover I evaluated population
and group competition bypotbesis using a pbysiological measure reflecting tbe effects
of social and environmental stress (glucocorticoids). Finally in Cbapter IV I focused on
the last step ofthe dispersa! process (immigration). Tbe main objective was evaluating
sex-biased dispersa! using indirect metbod ( co-dominant genetic markers ). I discuss tbis
finding at tbe ligbt of kin structure.