Effects of non-random juvenile mortality on small, inbred populations

Altered wing phenotypes of captive‐bred migratory birds lower post‐release fitness

“…body size, remained unchanged (Stojanovic et al, 2019). Juvenile orange‐bellied parrots face a gauntlet of obstacles to survival of their first year of life (Stojanovic et al, 2022; Stojanovic, Potts, Troy, et al, 2020)—perhaps greater drag of a rounder wing tip (Minias et al, 2015; Tucker, 1995) is enough to further disadvantage captive phenotypes during long flights. At the breeding ground where supplementary food and predator control is available, post‐release survival of captive‐bred parrots is very high (Troy & Lawrence, 2021).…”

“…The captive population is held across several participating institutions that use comparable husbandry approaches (Pritchard et al, 2022) and a studbook to minimise genetic adaptation to captivity (Morrison et al, 2020). Regular releases have resulted in full admixture of the captive and wild populations (Morrison et al, 2020; Stojanovic et al, 2022).…”

Altered wing phenotypes of captive-bred migratory birds incur post-release fitness costs

“…Despite this care, subtle changes to wing phenotypes emerged in captivity (Stojanovic et al 2021), despite similarities in other components of phenotype like overall body size (Stojanovic et al2019). Juvenile orangebellied parrots face a gauntlet of obstacles to survival of their first year of life (Stojanovic et al 2020b;Stojanovic et al 2022) -perhaps the likely increase in drag of a rounder wing tip (Tucker 1995;Minias et al 2015) is enough to further disadvantage captive phenotypes during long flights. At the breeding ground, post-release survival of captive-bred parrots is very high (Smales et al 2000), indicating stronger selection occurs during migration when juveniles are developing their survival skills and physical endurance.…”

Altered wing phenotypes of captive-bred migratory birds incur post-release fitness costs

“…Despite this care, subtle changes to wing phenotypes emerged in captivity (Stojanovic et al 2021), despite similarities in other components of phenotype like overall body size (Stojanovic et al2019). Juvenile orangebellied parrots face a gauntlet of obstacles to survival of their first year of life (Stojanovic et al 2020b;Stojanovic et al 2022) -perhaps the likely increase in drag of a rounder wing tip (Tucker 1995;Minias et al 2015) is enough to further disadvantage captive phenotypes during long flights. At the breeding ground, post-release survival of captive-bred parrots is very high (Smales et al 2000), indicating stronger selection occurs during migration when juveniles are developing their survival skills and physical endurance.…”