Warren Ben H, Strasberg Dominique, Bruggemann J Henrich, Prys-Jones Robert P, Thébaud Christophe
UMR PVBMT, Université de La Réunion-CIRAD, 7 Chemin de l'IRAT, Ligne Paradis, 97410 Saint Pierre, Réunion, France.
UMR PVBMT and Laboratoire ECOMAR, Faculté des Sciences et Technologies, Université de La Réunion, 15 Avenue René Cassin BP 7151, 97715 Saint-Denis Cedex 9, Réunion, France.
Cladistics. 2010 Oct;26(5):526-538. doi: 10.1111/j.1096-0031.2009.00300.x.
A corollary of island biogeographical theory is that islands are largely colonized from their nearest mainland source. Despite Madagascar's extreme isolation from India and proximity to Africa, a high proportion of the biota of the Madagascar region has Asian affinities. This pattern has rarely been viewed as surprising, as it is consistent with Gondwanan vicariance. Molecular phylogenetic data provide strong support for such Asian affinities, but often not for their vicariant origin; most divergences between lineages in Asia and the Madagascar region post-date the separation of India and Madagascar considerably (up to 87 Myr), implying a high frequency of dispersal that mirrors colonization of the Hawaiian archipelago in distance. Indian Ocean bathymetry and the magnitude of recent sea-level lowstands support the repeated existence of sizeable islands across the western Indian Ocean, greatly reducing the isolation of Madagascar from Asia. We put forward predictions to test the role of this historical factor in the assembly of the regional biota. © The Willi Hennig Society 2009.
岛屿生物地理学理论的一个推论是，岛屿大多是从距离其最近的大陆来源地进行物种殖民的。尽管马达加斯加与印度极度隔离且靠近非洲，但马达加斯加地区的生物群中有很大一部分具有亚洲亲缘关系。这种模式很少被视为令人惊讶的，因为它与冈瓦纳大陆的分隔相一致。分子系统发育数据为这种亚洲亲缘关系提供了有力支持，但对于它们的分隔起源往往并非如此；亚洲和马达加斯加地区的谱系之间的大多数分歧发生在印度和马达加斯加分离之后很久（长达8700万年），这意味着扩散频率很高，这与夏威夷群岛在距离上的殖民情况相似。印度洋的测深数据和近期海平面低位的幅度表明，印度洋西部曾多次存在相当大的岛屿，这大大减少了马达加斯加与亚洲之间的隔离。我们提出了一些预测，以检验这一历史因素在区域生物群组装中的作用。©威利·亨尼希协会2009年。
