The genetic rescue of two bottlenecked South Island robin populations using translocations of inbred donors

Author:

Heber S.1,Varsani A.123,Kuhn S.4,Girg A.4,Kempenaers B.4,Briskie J.1

Affiliation:

1. School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8041, New Zealand

2. Biomolecular Interaction Centre, University of Canterbury, Private Bag 4800, Christchurch 8041, New Zealand

3. Electron Microscope Unit, University of Cape Town, Rondebosch, 7701 Cape Town, South Africa

4. Department Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, Eberhard Gwinnerstr, 82319 Seewiesen, Germany

Abstract

Populations forced through bottlenecks typically lose genetic variation and exhibit inbreeding depression. ‘Genetic rescue’ techniques that introduce individuals from outbred populations can be highly effective in reversing the deleterious effects of inbreeding, but have limited application for the majority of endangered species, which survive only in a few bottlenecked populations. We tested the effectiveness of using highly inbred populations as donors to rescue two isolated and bottlenecked populations of the South Island robin ( Petroica australis ). Reciprocal translocations significantly increased heterozygosity and allelic diversity. Increased genetic diversity was accompanied by increased juvenile survival and recruitment, sperm quality, and immunocompetence of hybrid individuals (crosses between the two populations) compared with inbred control individuals (crosses within each population). Our results confirm that the implementation of ‘genetic rescue’ using bottlenecked populations as donors provides a way of preserving endangered species and restoring their viability when outbred donor populations no longer exist.

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Environmental Science,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine

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