Sargassum (Fucales, Phaeophyceae) in Mauritius and Réunion, western Indian Ocean: taxonomic revision and biogeography using hydrodynamic dispersal models
Sargassum (Fucales, Phaeophyceae) in Mauritius and Réunion, western Indian Ocean: taxonomic revision and biogeography using hydrodynamic dispersal models
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西印度洋毛里求斯和留尼汪岛的马尾藻（墨藻目、褐藻纲）：利用水动力扩散模型进行分类学修订和生物地理学
作者：
L. Mattio;M. Zubia;B. Loveday;E. Crochelet;N. Duong;C. Payri;R. Bhagooli;J. Bolton
Mattio L, Zubia M., Loveday B ., Crochelet E., Duong N., Payri C.E., Bhagooli R., Bolton J.J. 2013。毛里求斯和西印度洋r<s:1>的马尾藻（Fucales, Phaeophyceae）：基于水动力扩散模型的分类修正和生物地理学。心理学杂志52:578-594。毛里求斯和卢旺达是位于印度洋西南部的马斯克林群岛的一部分，位于马达加斯加以东约800公里处。在这些岛屿的文献中，共有44种不同的马尾藻和亚种分类群。对于这样孤立的小岛屿来说，这是一个了不起的数字，比马达加斯加或其他东非国家记录的数字还要多。本研究的第一个目的是利用新收集的标本对这些物种列表进行修订，为毛里求斯马尾藻和卢旺达马尾藻的鉴定提供可靠的说明工具。在形态学和分子分析的基础上，鉴定出6个分类群，分别为：S. cymosum f. borbonicum、S. obovatum、S. pfeifferae（恢复）、S. polycystum、S. portierianum和S. robillardii （stat. 11 .）。第7个分类群，S. scopula，是在植物标本馆发现的，但没有重新收集。结果表明，文献中所列的毛里西斯和rsamuunion的大部分物种是误认或同义种，并提出了3个新的同义种。利用局部和区域水动力扩散模型对6个马尾藻类群的生物地理学进行了进一步研究。结果强调了马斯卡林群岛的孤立位置：(1)马尾藻在当今条件下不太可能进口，(2)马尾藻可能在群岛内分散/交换，(3)马尾藻向马达加斯加和塞舌尔东海岸的出口有两条路，主要流向西北，弱流向西南。这些海洋条件可能塑造了马尾藻的多样性，特别是解释了S. cymosum f. borbonicum的特有性和S. obovatum、S. pfeifferae、S. robillardii和S. scopula的有限分布。
Mattio L., Zubia M., Loveday B, Crochelet E., Duong N., Payri C.E., Bhagooli R. and Bolton J.J. 2013. Sargassum (Fucales, Phaeophyceae) in Mauritius and Réunion, western Indian Ocean: taxonomic revision and biogeography using hydrodynamic dispersal models. Phycologia 52: 578–594. DOI: 10.2216/13-150.1 Mauritius and Réunion are part of the Mascarene Islands situated in the southwestern Indian Ocean, c. 800 km east of Madagascar. A total of 44 different Sargassum species and subspecific taxa was listed in the literature for these islands. This was a remarkable number for such isolated and small islands, and was more than have been recorded from Madagascar or other East African countries. The first aim of our study was to revise these species lists using newly collected specimens to provide a reliable and illustrated tool for the identification of the Mauritian and Réunion Sargassum. On the basis of morphological and molecular analyses, a total of six taxa was identified as S. cymosum f. borbonicum, S. obovatum, S. pfeifferae (reinstated), S. polycystum, S. portierianum and S. robillardii (stat. nov.). A seventh taxon, S. scopula, was identified from a herbarium collection but not re-collected. As a result of our taxonomic revision, we concluded that most of the species listed in the literature for both Mauritius and Réunion were misidentifications or synonyms, and we proposed three new taxonomic synonyms. The biogeography of the six Sargassum taxa was further investigated using local and regional hydrodynamic dispersal models. Results underlined the isolated position of the Mascarene Islands with (1) unlikely import of Sargassum in present-day conditions, (2) likely dispersal/exchanges within the archipelago and (3) a two-pronged export of Sargassum to the east coast of Madagascar and the Seychelles with a major stream northwestward and a weaker stream southwestward. These oceanic conditions had probably shaped the Sargassum diversity of the Mascarene Islands and in particular explained the endemicity of S. cymosum f. borbonicum and restricted distribution of S. obovatum, S. pfeifferae, S. robillardii and S. scopula.