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首页> 美国卫生研究院文献>other >Pleistocene to holocene expansion of the black-belt cichlid in Central America Vieja maculicauda (Teleostei: Cichlidae)
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Pleistocene to holocene expansion of the black-belt cichlid in Central America Vieja maculicauda (Teleostei: Cichlidae)

机译：中美洲黑带丽鱼科鱼的更新世到全新世的扩张（Teleostei：丽鱼科）

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摘要

The distributions of many Northern Hemisphere organisms have been influenced by fluctuations in sea level and climatic conditions during Pleistocene interglacial periods. These cycles are associated with range contraction and refugia for northern-distributed organisms as a response to glaciers. However, lower sea levels in the tropics and sub-tropics created available habitat for expansion of the ranges of freshwater organisms. The goal of this study was to use ecological niche modeling to test the hypothesis of north to south range expansion of Vieja maculicauda associated with Pleistocene glacial cycles. Understanding the biogeography of this widespread species may help us better understand the geology and interconnectivity of Central American freshwaters. Occurrence data for V. maculicauda was based on georeferencing of all museum records of specimens recovered from FishNet2. General patterns of phylogeographic structure were assessed with mtDNA. Present day niche models were generated and subsequently projected onto paleoclimatic maps of the region during the Last Interglacial, Last Glacial Maximum, and mid-Holocene. Phylogenetic analysis of mtDNA sequence data showed no phylogeographic structure throughout the range of this widespread species. Present day niche models were congruent with the observed distribution of V. maculicauda in Central America. Results showed a lack of suitable freshwater habitat in northern Central America and Mexico during the Last Interglacial, with greatest range expansion during the Last Glacial Maximum and mid-Holocene. Results support the hypothesis of a north to south range expansion of V. maculicauda associated with glacial cycles. The wide distribution of this species compared to other closely related cichlids indicates the latter did not respond to the degree of V. maculicauda in expansion of their distributions. Future work aimed at comparisons with other species and modeling of future climatic scenarios will be a fruitful area of investigation.
机译：在更新世间冰期，北半球许多生物的分布受到海平面和气候条件波动的影响。这些周期与北方分布的生物对冰川的响应范围缩小和避难所有关。但是，热带和亚热带的海平面较低，为扩大淡水生物的范围创造了可利用的栖息地。这项研究的目的是使用生态位模型来检验与更新世冰川周期有关的蓝斑虎（Vieja maculicauda）从北向南扩张的假说。了解这种广泛物种的生物地理学可能有助于我们更好地了解中美洲淡水的地质和相互联系。 V. maculicauda的发生数据是基于从FishNet2回收的所有博物馆记录的地理参考。线粒体结构的一般谱系用mtDNA评估。生成了当今的利基模型，随后将其投影到上一次冰间期，上一次冰川最大期和全新世中期期间的该地区的古气候图上。线粒体DNA序列数据的系统发育分析表明，在这一广泛分布的物种范围内，没有系统地理结构。当今的利基模型与中美洲斑驳弧菌的分布一致。结果表明，在最后一次冰期之间，中美洲北部和墨西哥缺乏合适的淡水生境，在最后一次冰期最大值和全新世中期期间，范围扩展最大。结果支持了与冰川循环相关的黄斑弧菌从北向南扩张的假说。与其他密切相关的丽鱼科鱼相比，该物种的广泛分布表明后者对斑马鱼的分布程度没有反应。旨在与其他物种进行比较和未来气候情景建模的未来工作将是一个富有成果的研究领域。

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