A species delimitation approach in the Trochulus sericeus/hispidus complex reveals two cryptic species within a sharp contact zone.
A species delimitation approach in the Trochulus sericeus/hispidus complex reveals two cryptic species within a sharp contact zone.
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DOI：
10.1186/1471-2148-9-171
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发表时间：
2009-07-21
影响因子：
3.4
通讯作者：
Pfenninger M
中科院分区：
文献类型：
--
作者：
Dépraz A;Hausser J;Pfenninger M
线粒体DNA测序越来越多地导致对遗传上不同但形态上神秘的谱系的识别。依赖于共同出现地区的多条证据的物种划界方法在推断它们的具体地位方面特别强大。我们利用线粒体和核DNA标记以及贝壳形态计量学研究了陆地蜗牛属两个隐秘谱系在接触区的物种边界。这两个线粒体谱系都有不同的地理分布，但有一个很小的共生区。在同一区域，我们检测到两个核基因簇，每个都与一个线粒体谱系高度相关。然而，这种关联也有例外：接触区中的一小部分个体表现出中等基因类型(4%)或细胞核不平衡(12%)。线粒体谱系和核簇都是贝壳形状的统计显著预测因子，表明形态分化。然而，谱系的形态空间在很大程度上是重叠的(低的后验分类成功率分别为69%和78%)：这两个谱系确实是神秘的。使用多条证据的综合方法支持这样一种假设，即被调查的轮虫谱系是生殖隔离的物种。然而，在较小的接触区域，血统的杂交程度有限。这一杂交区域的发现为陆生蜗牛杂交的罕见报道增加了一个例子。
Mitochondrial DNA sequencing increasingly results in the recognition of genetically divergent, but morphologically cryptic lineages. Species delimitation approaches that rely on multiple lines of evidence in areas of co-occurrence are particularly powerful to infer their specific status. We investigated the species boundaries of two cryptic lineages of the land snail genus Trochulus in a contact zone, using mitochondrial and nuclear DNA marker as well as shell morphometrics. Both mitochondrial lineages have a distinct geographical distribution with a small zone of co-occurrence. In the same area, we detected two nuclear genotype clusters, each being highly significantly associated to one mitochondrial lineage. This association however had exceptions: a small number of individuals in the contact zone showed intermediate genotypes (4%) or cytonuclear disequilibrium (12%). Both mitochondrial lineage and nuclear cluster were statistically significant predictors for the shell shape indicating morphological divergence. Nevertheless, the lineage morphospaces largely overlapped (low posterior classification success rate of 69% and 78%, respectively): the two lineages are truly cryptic. The integrative approach using multiple lines of evidence supported the hypothesis that the investigated Trochulus lineages are reproductively isolated species. In the small contact area, however, the lineages hybridise to a limited extent. This detection of a hybrid zone adds an instance to the rare reported cases of hybridisation in land snails.
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DOI：
10.1098/rsbl.2003.0025
发表时间：
2003-08-07
影响因子：
4.7
作者：
Hebert, PDN;Ratnasingham, S;deWaard, JR
通讯作者：
deWaard, JR
影响因子：
6.5
作者：
De Queiroz, Kevin
通讯作者：
De Queiroz, Kevin
影响因子：
6.5
作者：
Knowles, L. Lacey;Carstens, Bryan C.
通讯作者：
Carstens, Bryan C.
DOI：
10.1111/j.1471-8286.2007.01769.x
发表时间：
2007-09-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Chen, Chibiao;Durand, Eric;Francois, Olivier
通讯作者：
Francois, Olivier
影响因子：
7.7
作者：
Depraz, A.;Rathey, E.;Hausser, J.
通讯作者：
Hausser, J.