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Integrating hybrid zone analyses in species delimitation: lessons from two anuran radiations of the Western Mediterranean
Heredity ( IF 3.1 ) Pub Date : 2020-01-20 , DOI: 10.1038/s41437-020-0294-z Christophe Dufresnes 1, 2, 3 , Manon Pribille 2 , Bérénice Alard 4 , Helena Gonçalves 4, 5 , Fèlix Amat 6 , Pierre-André Crochet 7 , Sylvain Dubey 3, 8, 9 , Nicolas Perrin 8 , Luca Fumagalli 2 , Miguel Vences 10 , Iñigo Martínez-Solano 11
Heredity ( IF 3.1 ) Pub Date : 2020-01-20 , DOI: 10.1038/s41437-020-0294-z Christophe Dufresnes 1, 2, 3 , Manon Pribille 2 , Bérénice Alard 4 , Helena Gonçalves 4, 5 , Fèlix Amat 6 , Pierre-André Crochet 7 , Sylvain Dubey 3, 8, 9 , Nicolas Perrin 8 , Luca Fumagalli 2 , Miguel Vences 10 , Iñigo Martínez-Solano 11
Affiliation
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Molecular ecologists often rely on phylogenetic evidence for assessing the species-level systematics of newly discovered lineages. Alternatively, the extent of introgression at phylogeographic transitions can provide a more direct test to assign candidate taxa into subspecies or species categories. Here, we compared phylogenetic versus hybrid zone approaches of species delimitation in two groups of frogs from the Western Mediterranean region (Discoglossus and Pelodytes), by using genomic data (ddRAD). In both genera, coalescent analyses recovered almost all nominal taxa as “species”. However, the least-diverged pairs D. g. galganoi/jeanneae and P. punctatus/hespericus admix over hundreds of kilometers, suggesting that they have not yet developed strong reproductive isolation and should be treated as conspecifics. In contrast, the comparatively older D. scovazzi/pictus and P. atlanticus/ibericus form narrow contact zones, consistent with species distinctiveness. Due to their complementarity, we recommend taxonomists to combine phylogenomics with hybrid zone analyses to scale the gray zone of speciation, i.e., the evolutionary window separating widely admixing lineages versus nascent reproductively isolated species. The radically different transitions documented here conform to the view that genetic incompatibilities accumulating with divergence generate a weak barrier to gene flow for long periods of time, until their effects multiply and the speciation process then advances rapidly. Given the variability of the gray zone among taxonomic groups, at least from our current abilities to measure it, we recommend to customize divergence thresholds within radiations to categorize lineages for which no direct test of speciation is possible.
中文翻译：
在物种划界中整合杂种区分析：来自西地中海两个无尾类辐射的经验教训
分子生态学家通常依靠系统发育证据来评估新发现谱系的物种水平系统学。或者，系统地理学过渡处的基因渗入程度可以提供更直接的测试，以将候选分类群分配到亚种或物种类别中。在这里，我们通过使用基因组数据 (ddRAD) 比较了来自西地中海地区的两组青蛙（Discoglossus 和 Pelodytes）的物种划分的系统发育和杂交区方法。在这两个属中，聚结分析几乎将所有名义分类群恢复为“物种”。然而，最不发散的对 D. g. galganoi/jeanneae 和 P. punctatus/hespericus 混合了数百公里，这表明它们尚未形成强烈的生殖隔离，应视为同种。相比之下，相对较老的 D. scovazzi/pictus 和 P. atlanticus/ibericus 形成狭窄的接触区，与物种的独特性一致。由于它们的互补性，我们建议分类学家将系统基因组学与杂交区分析相结合，以扩大物种形成的灰色地带，即分离广泛混合谱系与新生生殖隔离物种的进化窗口。这里记录的完全不同的转变符合这样一种观点，即随着分歧的积累，遗传不相容性会在很长一段时间内对基因流动产生弱障碍，直到它们的影响成倍增加，然后物种形成过程迅速推进。鉴于分类群之间灰色地带的可变性，至少从我们目前衡量它的能力来看，
更新日期：2020-01-20
中文翻译：
在物种划界中整合杂种区分析：来自西地中海两个无尾类辐射的经验教训
分子生态学家通常依靠系统发育证据来评估新发现谱系的物种水平系统学。或者，系统地理学过渡处的基因渗入程度可以提供更直接的测试，以将候选分类群分配到亚种或物种类别中。在这里，我们通过使用基因组数据 (ddRAD) 比较了来自西地中海地区的两组青蛙（Discoglossus 和 Pelodytes）的物种划分的系统发育和杂交区方法。在这两个属中，聚结分析几乎将所有名义分类群恢复为“物种”。然而，最不发散的对 D. g. galganoi/jeanneae 和 P. punctatus/hespericus 混合了数百公里，这表明它们尚未形成强烈的生殖隔离，应视为同种。相比之下，相对较老的 D. scovazzi/pictus 和 P. atlanticus/ibericus 形成狭窄的接触区，与物种的独特性一致。由于它们的互补性，我们建议分类学家将系统基因组学与杂交区分析相结合，以扩大物种形成的灰色地带，即分离广泛混合谱系与新生生殖隔离物种的进化窗口。这里记录的完全不同的转变符合这样一种观点，即随着分歧的积累，遗传不相容性会在很长一段时间内对基因流动产生弱障碍，直到它们的影响成倍增加，然后物种形成过程迅速推进。鉴于分类群之间灰色地带的可变性，至少从我们目前衡量它的能力来看，
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