Borzée Amaël, Fong Jonathan J, Nguyen Hoa Quynh, Jang Yikweon
Laboratory of Animal Behaviour and Conservation, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
Science Unit, Lingnan University, Tuen Mun, Hong Kong.
Animals (Basel). 2020 Apr 27;10(5):764. doi: 10.3390/ani10050764.
Amphibians are in the midst of a sixth mass extinction, and human activities play a major role in pushing species towards extinction. Landscape anthropisation has impacts that indirectly threaten species, in addition to the obvious destruction of natural habitats. For instance, land modification may bring human-commensal species in contact with sister-clades from which they were previously isolated. The species in these new contact zones are then able to hybridise to the point of reaching lineage fusion, through which the gene pool of the two species merges and one of the parental lineages becomes extirpated. Here, we documented the patterns of hybridisation between the spatially restricted and the widespread On the basis of the analysis of Cytochrome c oxidase subunit I mitochondrial DNA sequences (404 individuals from 35 sites) and six polymorphic microsatellites (381 individuals from 34 sites), we revealed a generalised, bi-directional, and geographically widespread hybridisation between the two species. Evidence of fertile back-crosses is provided by relatively high numbers of individuals in cyto-nuclear disequilibrium, as well as the presence of hybrid individuals further south than the species distribution limit, determined on the basis of call properties. Hybridisation is an additional threat to the endangered .
两栖动物正处于第六次大灭绝之中，人类活动在推动物种走向灭绝方面起着主要作用。除了对自然栖息地的明显破坏外，景观的人类化还会产生间接威胁物种的影响。例如，土地改造可能会使与人类共生的物种与它们以前隔离的姐妹分支接触。这些新接触区域的物种随后能够杂交到达到谱系融合的程度，通过这种方式，两个物种的基因库合并，其中一个亲本谱系灭绝。在这里，我们记录了空间受限的[物种名称1]和分布广泛的[物种名称2]之间的杂交模式。基于对细胞色素c氧化酶亚基I线粒体DNA序列（来自35个地点的404个个体）和六个多态性微卫星（来自34个地点的381个个体）的分析，我们揭示了这两个物种之间普遍存在的、双向的和地理上广泛的杂交。细胞核不平衡中相对大量的个体，以及根据叫声特性确定的比物种分布极限更靠南的杂交个体的存在，提供了可育回交的证据。杂交是对濒危的[物种名称1]的又一威胁。
