Scope for genetic rescue of an endangered subspecies though re-establishing natural gene flow with another subspecies

Molecular Ecology
Katherine A HarrissonPaul Sunnucks

Abstract

Genetic diversity is positively linked to the viability and evolutionary potential of species but is often compromised in threatened taxa. Genetic rescue by gene flow from a more diverse or differentiated source population of the same species can be an effective strategy for alleviating inbreeding depression and boosting evolutionary potential. The helmeted honeyeater Lichenostomus melanops cassidix is a critically endangered subspecies of the common yellow-tufted honeyeater. Cassidix has declined to a single wild population of ~130 birds, despite being subject to intensive population management over recent decades. We assessed changes in microsatellite diversity in cassidix over the last four decades and used population viability analysis to explore whether genetic rescue through hybridization with the neighbouring Lichenostomus melanops gippslandicus subspecies constitutes a viable conservation strategy. The contemporary cassidix population is characterized by low genetic diversity and effective population size (N(e) < 50), suggesting it is vulnerable to inbreeding depression and will have limited capacity to evolve to changing environments. We find that gene flow from gippslandicus to cassidix has declined substantially rela...Continue Reading

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Citations

Jan 22, 2020·Animal Genetics·T do P PaimH D Blackburn
Apr 13, 2019·Evolutionary Applications·Brenton von Takach DukaiSam C Banks
Oct 24, 2019·Ecology and Evolution·Kate M QuigleyMadeleine J H van Oppen
Sep 25, 2020·Scientific Reports·Keren R SadanandanFrank E Rheindt
Jan 5, 2021·Ecology and Evolution·Elizabeth P FleschRobert A Garrott
Jul 13, 2019·Trends in Ecology & Evolution·Donovan A BellAndrew R Whiteley
Jul 22, 2021·Molecular Ecology Resources·Diana A Robledo-RuizPaul Sunnucks

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