HYBRIDIZATION AND CRYPTIC SPECIES IN DICAMPTODON (CAUDATA: DICAMPTODONTIDAE)
HYBRIDIZATION AND CRYPTIC SPECIES IN DICAMPTODON (CAUDATA: DICAMPTODONTIDAE)
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双节齿兽的杂交和隐秘种（有尾目：双节齿兽科）
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. A. Good
中科院分区：
文献类型：
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作者：
D. A. Good
双齿蝾螈属由至少4个遗传差异群体组成，在不同群体之间有10-19个固定等位基因差异（在31个位点中）。其中一个类群对应于D. copei；到目前为止，其他三种通常被认为属于单一形态同质的物种。两个遗传单位之间的地理接触发生在属中，一个发生在D. copei和“D。另一种是在俄勒冈州北部的两种高度不同的“D。在加利福尼亚北部沿海地区。在前者的情况下，没有杂交发生，而在后一种情况下，观察到一个狭窄的杂交区。在杂交带内似乎存在着对杂交的选择，而在杂交带外的渐渗现象显然不存在。因此，种群群似乎是遗传上独立的单位，Dicamptodon最好被认为由四个物种组成：D. copei， D. ensatus， D. tenbrosus和D. aterrimus。
The salamander genus Dicamptodon consists of at least four genetically divergent groups of populations with 10–19 fixed allelic differences (out of 31 loci scored) between populations in alternative groups. One of these groups corresponds to D. copei; the other three until now usually have been considered to belong to the single morphologically homogeneous species D. ensatus. Two instances of geographic contact between genetic units occur in the genus, one between D. copei and “D. ensatus” in northern Oregon and the other between two highly divergent types of “D. ensatus” in coastal northern Calfornia. In the former case no hybridization occurs, while in the latter a narrow hybrid zone has been observed. There appears to be selection against hybrids within this hybrid zone, and introgression beyond the zone is apparently nonexistent. The population groups therefore appear to be genetically independent units, and Dicamptodon is best considered to consist of four species: D. copei, D. ensatus, D. tenebrosus, and D. aterrimus.