Hybridization despite elaborate courtship behavior and female choice in Neotropical tree frogs
Hybridization despite elaborate courtship behavior and female choice in Neotropical tree frogs
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DOI：
10.1111/1749-4877.12628
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发表时间：
2022-02-19
影响因子：
3.3
通讯作者：
Prado，Cynthia P. A.
中科院分区：
文献类型：
--
作者：
Nali，Renato C.;Zamudio，Kelly R.;Prado，Cynthia P. A.
杂交的机制可以通过分析基因型以及表型来阐明，这些表型可以作为交配前的障碍，因为异种之间的生殖相互作用可以改变物种的进化历史。在青蛙中，杂交种通常发生在爆炸性繁殖（密集聚集）的物种中，很少有交配选择的机会，但在具有复杂求偶行为的物种中很少见，这可能会防止错误的交配。使用21个微卫星标记，我们研究了长期繁殖的树蛙Bokermannohyla ibitiguara和B. sazimaisampled在接触区在巴西稀树草原（72蝌蚪; 74成人）。我们还比较了声学和形态学数据。我们在遗传上证实了两个亲本物种;结构结果证实了14个杂交种，其中11个是根据NEWHYBRIDS的第二代，与亲本相比，所有杂交种的遗传差异值都在中间。形态和声学分析表明，杂交表现出变量，但不一定中间表型。此外，2个杂种表现出与亲本不同的叫声类型。B. ibitiguara涉及领土和侵略性的男性，精心制作的求爱与听觉和触觉刺激，挑剔的女性，和机会主义的策略。我们的研究揭示了一个罕见的情况下，可行的杂交密切相关的青蛙与这样一个复杂的求偶行为和配偶选择的组合。我们讨论了这一现象背后可能的方向性和机制，并强调调查杂交的重要性，即使在物种，显示精心繁殖和女性的选择，以促进我们对动物多样化的理解。
The mechanisms of hybridization can be elucidated by analyzing genotypes as well as phenotypes that could act as premating barriers, as the reproductive interactions among heterospecifics can alter the evolutionary history of species. In frogs, hybrids typically occur among species that reproduce explosively (in dense aggregations) with few opportunities for mate selection but are rare in species with elaborate courtship behaviors that may prevent erroneous mating. Using 21 microsatellite markers, we examined hybridization in the prolonged‐breeding tree frogsBokermannohyla ibitiguaraandB. sazimaisampled within a contact zone in the Brazilian savanna (72 tadpoles; 74 adults). We also compared acoustic and morphological data. We confirmed both parental species genetically; STRUCTURE results confirmed 14 hybrids, 11 of which were second‐generation according to NEWHYBRIDS, all with intermediate values of genetic dissimilarities compared to the parentals. Morphological and acoustic analyses revealed that hybrids showed variable but not necessarily intermediate phenotypes. Moreover, 2 hybrids exhibited call types different from parentals. The reproduction ofB. ibitiguarainvolves territorial and aggressive males, elaborate courtships with acoustic and tactile stimuli, choosy females, and opportunistic strategies. Our study uncovers a rare case of viable hybridization among closely related frogs with such a combination of complex courtship behaviors and mate choice. We discuss the likely directionality and mechanisms behind this phenomenon, and highlight the importance of investigating hybridization even in species that show elaborate reproduction and female choice to advance our understanding of animal diversification.