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Providing evidence to improve practice

Individual study: Demographic trends of a reintroduced Iberian ibex Capra pyrenaica victoriae population in central Spain

Published source details

Refoyo P., Olmedo C., Polo I., Fandos P. & Munoz B. (2015) Demographic trends of a reintroduced Iberian ibex Capra pyrenaica victoriae population in central Spain. Mammalia, 79, 139-145


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Translocate to re-establish or boost populations in native range Terrestrial Mammal Conservation

A study in 2003–2007 in a mixed shrub, grassland and forest area near Madrid, Spain (Refoyo et al. 2015) found that following translocation, Iberian ibex Capra pyrenaica numbers increased and ibex expanded their range. In the first eight to 10 years after translocation began, ibex numbers increased by 23%/year on average (at release: 67 individuals; after 8-10 years: 359 individuals), by 36%/year for the next three years (after 11-13 years: 773 individuals), and by 19%/year in the following four years (after 15-17 years: 1,523 individuals). The birth rate was 0.76 calves/adult female and the area that ibex occupied increased from 2,102 ha in 2000 to 3,279 ha in 2007. In 1990–1992, sixty-seven wild-born Iberian ibex (41 females and 26 males) were translocated to a 4,890-ha national park. The translocated population was monitored between May and June in 2000, 2005, and 2007. Ibex were counted along 22 transects (average length 3.6 km) using binoculars. Transects were walked 2–3 hours after sunrise or 2–3 hours before sunset. The study area included high altitude (1,100–2,200 m) shrubland, grassland and forest areas.

(Summarised by Ricardo Rocha)