Thavornkanlapachai Rujiporn, Mills Harriet R, Ottewell Kym, Lambert Cathy, Friend J Anthony, White Daniel J, Aisya Zahra, Kennington W Jason
School of Biological Sciences The University of Western Australia Crawley Western Australia Australia.
Department of Biodiversity, Conservation and Attractions Biodiversity and Conservation Science Bentley Western Australia Australia.
Evol Appl. 2025 Jan 21;18(1):e70073. doi: 10.1111/eva.70073. eCollection 2025 Jan.
Translocating individuals from multiple source populations is one way to bolster genetic variation and avoid inbreeding in newly established populations. However, mixing isolated populations, especially from islands, can potentially lead to outbreeding depression and/or assortative mating, which may limit interbreeding between source populations. Here, we investigated genetic consequences of mixing individuals from two island populations of the dibbler () in an island translocation. Despite a high level of genetic divergence between the source populations ( ranges 0.33-0.64), and significant differences in body size, individuals with different ancestries were able to successfully interbreed in captivity and in the wild. However, the genetic contributions from each source population were unequal initially despite each of the source populations contributing an equal number of founders. Mating success of captive animals based on the pedigree suggests that this bias toward one source population was due to founder mortality and the mating success of younger and heavier animals. Nevertheless, genetic contributions in the translocated population became equal over time with no parental purebreds, suggesting an extreme excess of hybrids across multiple years. While genetic variation in the translocated population was comparable or higher than the source populations, the increase was short-lived. Genetic composition of captive animals may not reflect what happens in the wild. These changes post-translocation highlight the need for continued genetic monitoring.
从多个源种群迁移个体是增加遗传变异并避免新建立种群近亲繁殖的一种方法。然而，混合隔离种群，尤其是来自岛屿的种群，可能会导致远交衰退和/或选型交配，这可能会限制源种群之间的杂交。在这里，我们研究了在一次岛屿迁移中混合来自两个斑袋鼬（）岛屿种群个体的遗传后果。尽管源种群之间存在高度的遗传分化（范围为0.33 - 0.64），且体型存在显著差异，但不同祖先的个体能够在圈养和野外成功杂交。然而，尽管每个源种群贡献的奠基者数量相等，但最初每个源种群的遗传贡献并不相等。基于谱系的圈养动物交配成功率表明，对一个源种群的这种偏向是由于奠基者死亡以及年轻和较重动物的交配成功率。尽管如此，随着时间的推移，迁移种群中的遗传贡献变得相等，且没有亲本纯种，这表明多年来杂种极度过剩。虽然迁移种群中的遗传变异与源种群相当或更高，但这种增加是短暂的。圈养动物的遗传组成可能无法反映野外的情况。迁移后的这些变化凸显了持续进行遗传监测的必要性。
