Circumantarctic distribution in Southern Ocean benthos? A genetic test using the genus Macroscapha (Crustacea, Ostracoda) as a model
Circumantarctic distribution in Southern Ocean benthos? A genetic test using the genus Macroscapha (Crustacea, Ostracoda) as a model
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DOI：
10.1016/j.ympev.2010.01.014
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发表时间：
2010-06-01
影响因子：
4.1
通讯作者：
Schon, Isa
中科院分区：
文献类型：
--
作者：
Brandao, Simone N.;Sauer, Jan;Schon, Isa
本文以介形类属大型底栖动物为模型，验证了南大洋底栖动物物种分布的预测理论。关于南极介形类的早期研究报告了五种北极区和/或终水区的巨型脊椎动物。然而，最近的分类学修订使用了狭义的形态种定义，并将这五个种细分为20个形态种。这些狭义物种中的大多数显示出有限的深度和地理分布。在这里，遗传标记被用来调查七种巨藻属植物的地理和水深分布。遗传结果(尤其是COI，但部分也包括ITS)支持更有限的地理范围，并表明更受限制的深度分布。因此，我们的结果证实了狭义形态物种定义的有用性。我们的数据集还表明，一个物种组(即不仅在地理上是分离的，而且在水深上也是分开的。为此，建议重新评估关于南大洋底栖物种在北极周围和底栖动物分布的主流理论。(C)2010 Elsevier Inc.保留所有权利。
The ostracod genus Macroscapha is used as a model to test theories predicting circumantarctic distribution of benthic species from the Southern Ocean. Earlier works on Antarctic Ostracoda reported five circumantarctic and/or eurybathic Macroscapha species. However, a recent taxonomic revision used a narrow morphological species definition and subdivided these five species into 20 morphospecies. Most of these narrowly defined species showed restricted depth and geographical distribution. Here, genetic markers are used to investigate the geographic and bathymetric distribution of seven species of the genus Macroscapha. The genetic results (especially COI, but partially also ITS) support more restricted geographical ranges and indicate more restricted depth distributions. Our results therefore corroborate the usefulness of a narrow morphological species definition. Our dataset also indicates that the 'genetic entities' of one species group (i.e. 'Mh. tensa-opaca') are not only geographically but also bathymetrically segregated. For that reason, a re-evaluation of the prevailing theories on the circumantarctic and eurybathic distribution of Southern Ocean benthic species is suggested. (C) 2010 Elsevier Inc. All rights reserved.