The odd one out or a hidden generalist: Hawaiian Melicope (Rutaceae) do not share traits associated with successful island colonization

The odd one out or a hidden generalist: Hawaiian Melicope (Rutaceae) do not share traits associated with successful island colonization
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奇怪的人或隐藏的多面手:夏威夷梅利科普(芸香科)不具有与成功的岛屿殖民相关的特征

DOI:
10.1111/jse.12454
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发表时间:
2018
影响因子:
3.7
通讯作者:
Appelhans MS
Appelhans MS
中科院分区:
生物学1区
文献类型:
--
作者:
Paetzold C;Kiehn M;Wood KR;Wagner WL;Appelhans MS

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海洋岛屿的物种组成是独特的,其定义是殖民者通过长距离扩散到达,然后建立物种,然后在某些情况下进行适应性辐射。进化生物学家发现了促进岛屿成功殖民的特征,包括多倍体、自交亲和性、草本性和长距离扩散的能力。岛屿上谱系的成功建立和进化多样化通常涉及木质化的转变、异型杂交方法的转变以及传播能力的变化。 Melicope属分布在包括夏威夷群岛在内的整个太平洋的许多群岛上,该谱系目前包括54个特有物种,代表了岛上最大的木本植物辐射范围。该属的广泛分布范围说明了其高分散性,很可能是由于对鸟类传播的适应。在这里,我们使用流式细胞术和染色体计数研究该属的倍性。我们发现该属是古多倍体,具有 2n= 4x= 36,这一倍性水平表征了整个 Amyridoideae 亚科的特征,并且至少可以追溯到古新世。因此,夏威夷Melicope 在岛屿殖民化之前并未经历最近的多倍化。因此,Melicoper保持了殖民成功,同时表现出通常代表成熟岛屿专家的特征组合,同时缺乏与成功殖民者相关的一些特征。
Oceanic islands are unique in their species composition, which is defined by arrival of colonizers via long distance dispersal followed by establishment of species followed in some cases by adaptive radiation. Evolutionary biologists identified traits facilitating successful colonization of islands as including polyploidy, self‐compatibility, herbaceousness and ability for long‐distance dispersal. Successful establishment and evolutionary diversification of lineages on islands often involves shifts to woodiness and shifts in methods of outcrossing as well as changes in dispersal ability. The genusMelicopecolonized numerous archipelagos throughout the Pacific including the Hawaiian Islands, where the lineage comprises currently 54 endemic species and represents the largest radiation of woody plants on the islands. The wide distributional range of the genus illustrates its high dispersibility, most likely due to adaption to bird dispersal. Here we investigate ploidy in the genus using flow cytometry and chromosome counting. We find the genus to be paleopolyploid with 2n= 4x= 36, a ploidy level characterizing the entire subfamily Amyridoideae and dating back to at least the Palaeocene. Therefore HawaiianMelicopehave not undergone recent polyploidization prior to colonization of the islands. ThusMelicoperetained colonization success while exhibiting a combination of traits that typically characterize well established island specialists while lacking some traits associated to successful colonizers.
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发表时间: 2012-07-01
影响因子: 3.9
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