Convergent Evolution of Hawaiian and Australo-Pacific Honeyeaters from Distant Songbird Ancestors
Convergent Evolution of Hawaiian and Australo-Pacific Honeyeaters from Distant Songbird Ancestors
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DOI：
10.1016/j.cub.2008.10.051
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发表时间：
2008-12-23
期刊：
影响因子：
9.2
通讯作者：
Olson, Storrs L.
中科院分区：
文献类型：
--
作者：
Fleischer, Robert C.;James, Helen F.;Olson, Storrs L.
夏威夷“食蜜鸟”是莫霍族和毛翅目鸟类中最近灭绝的五种特有的食花蜜鸣禽，它们的外观和行为都像澳大利亚食蜜鸟（吸蜜鸟科），自从詹姆斯·库克第三次航行中发现它们以来，没有任何分类学家将它们归类为其他物种 [1-8]。我们从 115-158 年前在夏威夷收集的莫霍面和毛毛藻博物馆标本中获得了 DNA 序列。这些序列的系统发育分析支持这两个夏威夷属的单系性，但令人惊讶的是，这两个分类单元都不是吸蜜鸟，甚至也不是与吸蜜鸟位于鸣禽辐射的同一部分。相反，夏威夷物种是雀鸟类群的不同成员，该类群包括看似不同的鸣禽科（全北极太平鸟、新热带丝鹟和棕榈鹟）。在这里，我们将它们指定为一个新科：Mohoidae。核 DNA 速率校准 [9] 表明莫霍科动物与其最近的现存祖先 14-17 mya 分化，这与鸟类授粉植物谱系估计最早抵达夏威夷的时间一致 [10]。趋同进化，即由于共同的选择压力，远缘类群中相似特征的进化，以花蜜为食的鸟类很好地说明了这一点[11]，但莫霍科动物与澳大利亚吸蜜鸟在形态、行为和生态上的相似性使它们成为这一现象的一个特别引人注目的例子。
The Hawaiian "honeyeaters," five endemic species of recently extinct, nectar-feeding songbirds in the genera Moho and Chaetoptila, looked and acted like Australasian honeyeaters (Meliphagidae), and no taxonomist since their discovery on James Cook's third voyage has classified them as anything else [1-8]. We obtained DNA sequences from museum specimens of Moho and Chaetoptila collected in Hawaii 115-158 years ago. Phylogenetic analysis of these sequences supports monophyly of the two Hawaiian genera but, surprisingly, reveals that neither taxon is a meliphagid honeyeater, nor even in the same part of the songbird radiation as meliphagids. Instead, the Hawaiian species are divergent members of a passeridan group that includes deceptively dissimilar families of songbirds (Holarctic waxwings, neotropical silky flycatchers, and palm chats). Here we designate them as a new family, the Mohoidae. A nuclear-DNA rate calibration [9] suggests that mohoids diverged from their closest living ancestor 14-17 mya, coincident with the estimated earliest arrival in Hawaii of a bird-pollinated plant lineage [10]. Convergent evolution, the evolution of similar traits in distantly related taxa because of common selective pressures, is illustrated well by nectar-feeding birds [11], but the morphological, behavioral, and ecological similarity of the mohoids to the Australasian honeyeaters makes them a particularly striking example of the phenomenon.