Molecular phylogeny and ecological diversification in a clade of New World songbirds (genus Vireo)
Molecular phylogeny and ecological diversification in a clade of New World songbirds (genus Vireo)
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DOI：
10.1046/j.1365-294x.1998.00483.x
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发表时间：
1998-10-01
影响因子：
4.9
通讯作者：
Johnson, NK
中科院分区：
文献类型：
--
作者：
Cicero, C;Johnson, NK
我们构建了一个眼环病毒（Vireo flavfrons和V. solitarius complex）进化支的分子系统发育，以检验现有的物种形成和生态多样化假说。从该群体的47个个体和4个病毒样外群体中获得了mtDNA细胞色素b基因的完整序列。该分支的平均序列分化水平在0.29% ~ 5.7%之间。黄花弧菌与“孤独弧菌”4个分类群间差异最大。后者在分类学、地理学和生态学上分为三个类群：水蛭（V. plumbeus plumbeus）、卡西尼水蛭（V. cassinii cassinii）和孤独水蛭（V. solitarius solitarius solitarius alticola）。这些差异平均为2.6-3.2%。各类群内居群的序列变异程度较低（(x)大于柱形值= 0.20%），地理结构不明显。mtDNA数据通常证实了同酶的结果。V. plumbeus显示从祖先的条件下黄绿色类胡萝卜素色素沉着的损失。这一物种和卡西尼蝽占据相对干燥的生境，代表了由其他种类占据更湿润的环境而衍生的生态转变。该支系的生态分化发生在异种中，并与形态计量学和觅食方式的一般水平稳定性有关。在温带环境中繁殖的病毒，其迁徙行为和季节性栖息地转移明显地进化了多次。目前的地理和生态分布，以及低水平的类群内遗传分化，被认为是冰川后气候-植物关联区域化和繁殖范围迅速向北扩展的结果。
We constructed a molecular phylogeny for a clade of eye-ringed vireos (Vireo flavifrons and the V. solitarius complex) to examine existing hypotheses of speciation and ecological diversification. Complete sequences of the mtDNA cytochrome b gene were obtained from 47 individuals of this group plus four vireonid outgroups. Mean levels of sequence divergence in the clade varied from 0.29% to 5.7%. Differences were greatest between V. flavifrons and four taxa of 'V. solitarius'. The latter separated into three taxonomic, geographical and ecological groups: V. plumbeus plumbeus, V. cassinii cassinii, and V. solitarius solitarius plus V. solitarius alticola. These differed by an average of 2.6-3.2%. Populations within each group revealed low levels of sequence variation ((x) over bar = 0.20%) and little geographical structuring. The mtDNA data generally corroborate results from allozymes. V. plumbeus shows a loss of yellow-green carotenoid pigmentation from the ancestral condition. The occupancy of relatively dry habitats by this species and V. cassinii represents a derived ecological shift from more-humid environments occupied by other species of vireonids. Ecological divergence in this clade occurred in allopatry and is associated with generic-level stability in morphometrics and foraging styles. Migratory behaviour and seasonal habitat shifts apparently evolved multiple times in vireos breeding in temperate environments. Present geographical and ecological distributions, and low levels of intrataxon genetic divergence, are hypothesized to be the result of postglacial regionalization of climate-plant associations and rapid northward expansion of breeding ranges.