Frequency-Dependent Hybridization Contributes to Habitat Segregation in Monkeyflowers
Frequency-Dependent Hybridization Contributes to Habitat Segregation in Monkeyflowers
复制标题
频率依赖性杂交有助于猴花的栖息地分离
DOI：
10.1086/719381
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Lowry, David B.
中科院分区：
文献类型：
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作者：
Toll, Katherine;Lowry, David B.
近缘物种的空间分离通常归因于胁迫耐受性和竞争能力的差异。对于动物和植物来说，近亲之间的生殖相互作用可能会产生对稀有物种更为不利的适应性成本。频率依赖性交配的相互作用，从而防止建立移民内异种种群，保持空间分离的物种。尽管在自然种群中存在很强的空间分离，但两种同域分布的加州猴花（Mimulus nudatus和M.当被移植到另一个物种的栖息地时，它们可以在另一个物种的栖息地生存和繁殖。我们假设，一个频率依赖的交配劣势保持这些monkeyflowers在自然移民的空间隔离。为了验证这一假设，我们进行了两个现场实验。首先，我们实验性地将不同数量的移民添加到以异质物种为主的网站。第二，我们重新移植了不同居民和移民频率的数组。迁移种子生活力下降，同种稀有forM。但不是给M.裸体我们观察到这两个物种的移民少数民族的劣势，但它是由不同的因素驱动的频率依赖性杂交forM。guttatus和竞争的资源和/或授粉forM.裸体总体而言，我们的研究结果表明，生殖干扰的空间隔离，应评估沿着胁迫耐受性和竞争能力的主要作用。
Spatial segregation of closely related species is usually attributed to differences in stress tolerance and competitive ability. For both animals and plants, reproductive interactions between close relatives can impose a fitness cost that is more detrimental to the rarer species. Frequency-dependent mating interactions may thus prevent the establishment of immigrants within heterospecific populations, maintaining spatial segregation of species. Despite strong spatial segregation in natural populations, two sympatric California monkeyflowers (Mimulus nudatusandM. guttatus) survive and reproduce in the other’s habitat when transplanted reciprocally. We hypothesized that a frequency-dependent mating disadvantage maintains spatial segregation of these monkeyflowers during natural immigration. To evaluate this hypothesis, we performed two field experiments. First, we experimentally added immigrants in varying numbers to sites dominated by heterospecifics. Second, we reciprocally transplanted arrays of varying resident and immigrant frequencies. Immigrant seed viability decreased with conspecific rarity forM. guttatusbut not forM. nudatus. We observed immigrant minority disadvantage for both species, but it was driven by different factors—frequency-dependent hybridization forM. guttatusand competition for resources and/or pollinators forM. nudatus. Overall, our results suggest a major role for reproductive interference in spatial segregation that should be evaluated along with stress tolerance and competitive ability.