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Effect of hybridization with genome exclusion on extinction risk

机译：杂交与基因组排除对灭绝风险的影响

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Human-induced habitat changes may lead to the breakdown of reproductive barriers between distantly related species. This phenomenon may result in fertile first-generation hybrids (F-1) that exclude the genome of one parental species during gametogenesis, thus disabling introgression. The species extinction risk associated with hybridization with genome exclusion is largely underappreciated because the phenomenon produces only F-1 hybrid phenotype, leading to the misconception that hybrids are sterile and potentially of minor conservation concern. We used a simulation model that integrates the main genetic, demographic, and ecological processes to examine the dynamics of hybridization with genome exclusion. We showed that this mode of hybridization may lead to extremely rapid extinction when the process of genome exclusion is unbalanced between the interbreeding species and when the hybridization rate is not negligible. The coexistence of parental species was possible in some cases of asymmetrical genome exclusion, but show this equilibrium was highly vulnerable to environmental variation. Expanding the exclusive habitat of the species at risk allowed its persistence. Our results highlight the extent of possible extinction risk due to hybridization with genome exclusion and suggest habitat management as a promising conservation strategy. In anticipation of serious threats to biodiversity due to hybridization with genome exclusion, we recommend a detailed assessment of the reproductive status of hybrids in conservation programs. We suggest such assessments include the inspection of genetic content in hybrid gametes.
机译：人类诱导的栖息地变化可能导致远处相关物种之间的生殖障碍崩溃。这种现象可能导致可育第一代杂种（F-1），其在配子发生过程中排除一个父母种类的基因组，从而致残。与基因组排除杂交相关的物种消失风险主要被低估，因为该现象仅产生F-1杂交表型，导致杂交种是无菌和潜在的轻微保护问题的误解。我们使用了集成的模拟模型，整合了主要的遗传，人口统计学和生态过程，以检查与基因组排除杂交的动态。我们认为这种杂交模式可能导致在杂交物种之间的基因组排除过程中不平衡时极快地消失，并且当杂交率不可忽略时。在一些不对称基因组排除病例中，父母物种的共存是可能的，但显示这种平衡非常容易受到环境变异的影响。在风险中扩大物种的独家栖息地使其坚持不懈。我们的结果突出了由于与基因组排除的杂交和建议栖息地管理作为有前途的保护策略的可能性灭绝风险的程度。在预期由于与基因组排除杂交引起的对生物多样性的严重威胁，我们建议详细评估保护计划中杂交种的生殖状态。我们建议这些评估包括检查杂种配子中的遗传含量。

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