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A holocenic and dynamic hybrid zone between two cactophilic Drosophila species in a coastal lowland plain of the Brazilian Atlantic Forest.
Journal of Evolutionary Biology ( IF 2.1 ) Pub Date : 2021-10-06 , DOI: 10.1111/jeb.13934
Dora Yovana Barrios-Leal 1 , Rodolpho S T Menezes 2 , João Victor Ribeiro 2 , Luiz Bizzo 3, 4 , Fabio Melo de Sene 1, 2 , João Neves-da-Rocha 2 , Maura Helena Manfrin 1, 2
Affiliation  

Hybridization and introgression are processes that contribute to shaping biological diversity. The factors promoting the formation of these processes are multiples but poorly explored in a biogeographical and ecological context. In the southeast coastal plain of the Brazilian Atlantic Forest, a hybrid zone was described between two closely related cactophilic species, Drosophila antonietae and D. serido. Here, we revisited and analysed specimens from this hybrid zone to evaluate its temporal and spatial dynamic. We examined allopatric and sympatric populations of the flies using independent sources of data such as mitochondrial and nuclear sequences, microsatellite loci, morphometrics of wings and male genitalia, and climatic niche models. We also verified the emergence of the flies from necrotic tissues of collected cacti to verify the role of host association for the population dynamics. Our results support the existence of a hybrid zone due to secondary contact and limited to the localities where the two species are currently in contact. Furthermore, we detected asymmetric bidirectional introgression and the maintenance of the species integrity, ecological association and morphological characters, suggesting selection and limited introgression. Considering our paleomodels, probably this hybrid zone is recent and the contact occurred during the Holocene to the present day, favoured by range expansion of their populations due to expansion of open and dry areas in eastern South America during palaeoclimatic and geomorphological events.

中文翻译:

巴西大西洋森林沿海低地平原中两种嗜食果蝇物种之间的全新和动态杂交区。

杂交和基因渗入是有助于塑造生物多样性的过程。促进这些过程形成的因素是多方面的,但在生物地理和生态背景下却鲜有探讨。在巴西大西洋森林的东南沿海平原,描述了两个密切相关的嗜食菌物种 Drosophila antonietae 和 D. serido 之间的杂交区。在这里,我们重新审视并分析了来自该混合区的标本,以评估其时空动态。我们使用独立的数据来源(如线粒体和核序列、微卫星位点、翅膀和雄性生殖器的形态测量学以及气候生态位模型)检查了果蝇的异域和同域种群。我们还验证了从收集的仙人掌坏死组织中出现的苍蝇,以验证宿主关联对种群动态的作用。我们的结果支持由于二次接触而存在杂交区,并且仅限于两个物种目前接触的地方。此外,我们检测到不对称的双向基因渗入和物种完整性、生态关联和形态特征的维持,表明选择和有限的基因渗入。考虑到我们的古模型,这个混合带可能是最近的,接触发生在全新世至今,由于古气候和地貌事件期间南美洲东部开阔和干燥地区的扩张,它们的种群范围扩大有利于它们。我们的结果支持由于二次接触而存在杂交区,并且仅限于两个物种目前接触的地方。此外,我们检测到不对称的双向基因渗入和物种完整性、生态关联和形态特征的维持,表明选择和有限的基因渗入。考虑到我们的古模型,这个混合带可能是最近的,接触发生在全新世至今,由于古气候和地貌事件期间南美洲东部开阔和干燥地区的扩张,它们的种群范围扩大有利于它们。我们的结果支持由于二次接触而存在杂交区,并且仅限于两个物种目前接触的地方。此外,我们检测到不对称的双向基因渗入和物种完整性、生态关联和形态特征的维持,表明选择和有限的基因渗入。考虑到我们的古模型,这个混合带可能是最近的,接触发生在全新世至今,由于古气候和地貌事件期间南美洲东部开阔和干燥地区的扩张,它们的种群范围扩大有利于它们。我们检测到不对称的双向基因渗入和物种完整性、生态关联和形态特征的维持,表明选择和有限的基因渗入。考虑到我们的古模型,这个混合带可能是最近的,接触发生在全新世至今,由于古气候和地貌事件期间南美洲东部开阔和干燥地区的扩张,它们的种群范围扩大有利于它们。我们检测到不对称的双向基因渗入和物种完整性、生态关联和形态特征的维持,表明选择和有限的基因渗入。考虑到我们的古模型,这个混合带可能是最近的,接触发生在全新世至今,由于古气候和地貌事件期间南美洲东部开阔和干燥地区的扩张,它们的种群范围扩大有利于它们。
更新日期:2021-09-19
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