Morphology, ultrastructure and phylogenetic affinities of the single-island endemic Anthoceros cristatus Steph. (Ascension Island)

Morphology, ultrastructure and phylogenetic affinities of the single-island endemic Anthoceros cristatus Steph. (Ascension Island)
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单岛特有花冠花的形态学、超微结构和系统发育亲缘关系。

DOI:
10.1080/03736687.2017.1302153
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发表时间:
2017
影响因子:
1.9
通讯作者:
Villarreal J
Villarreal J
中科院分区:
生物学4区
文献类型:
--
作者:
Villarreal J

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海洋岛屿由于其地理上的孤立、数量、精确界定的边界及其地貌和气候的多样性,为物种形成、扩散、适应辐射和宏观生态过程提供了大量的见解。这些岛屿研究的关键组成部分之一是单岛特有种(SIE)的作用,因为在许多情况下,岛屿地理模型使用SIE的比例来推断进化过程。因此,必须进行关键的分类学修订,以评估SIE,因为SIE数量的变化对下游的地理分析有关键影响。我们使用光学显微镜和电子显微镜,以及生物基因组学工具,修正了Ascension岛上一个假定的SIEAnthoceros cristatuson的特例。Cristatuslies in the A. Agrestis/A. punctatuscomplex,但与姊妹种A. agrestisandA.孢子形态具斑点,配子体薄片具早落的边缘细胞。目前的确认,从分子和形态,的SIE状态ofAnthoceros cristatus和其在岛上的有限分布,使其栖息地的保护优先事项。阿森松岛(Ascension Island)是100万年前从海洋中出现的海底火山的尖端,面积约91平方公里,其中绿色山(Green Mountain)为最高海拔(海拔1859米)。  Ascension有一个相对较低的87种物种的brabrite的多样性,但这包括12个地方性(约14%),一个更高的水平比上更speciose Macaronesian群岛的地方性。
Oceanic islands, due to their geographical isolation, number, precisely defined boundaries and their geomorphological and climatic diversity, have provided enormous insights into speciation, dispersal, adaptive radiations and macroecological processes. One of the key components of these island studies is the role of single-island endemics (SIEs) as, in many instances, island biogeography models use the proportion of SIEs to infer evolutionary processes. It is, therefore, imperative to undertake critical taxonomic revisions to evaluate SIEs because changes in the number of SIEs have a key impact on downstream biogeographic analyses. We revise the special case of a putative SIEAnthoceros cristatuson Ascension Island using light and electron microscopy, as well phylogenomic tools.A. cristatuslies within theA. agrestis/A. punctatuscomplex but differs from the sister speciesA. agrestisandA. punctatusin spore morphology and gametophytic lamellae fringed with caducous marginal cells. The present confirmation, from both molecules and morphology, of the SIE status ofAnthoceros cristatusand its restricted distribution on the Island makes the preservation of its habitat a conservation priority. Ascension Island is the tip of an undersea volcano that is thought to have emerged from the ocean 1 million years ago with an area of approximately 91 km2, with Green Mountain as the highest elevation (∼859 m a.s.l.). Ascension has a relative low bryophyte species diversity of 87 spp but this includes 12 endemics (∼14%); a much higher level of endemism than on the far more speciose Macaronesian Islands.
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