Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, Cuernavaca, Morelos C.P. 62209, Mexico.
Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Chamilpa, Cuernavaca, Morelos C.P. 62209, Mexico.
Mol Phylogenet Evol. 2018 Nov;128:12-25. doi: 10.1016/j.ympev.2018.06.018. Epub 2018 Jun 12.
Mesoamerica is considered a biodiversity hot spot with levels of endemism and species diversity likely underestimated. Unfortunately, the region continues to experience some of the highest deforestation rates in the world. For mammals, the evolutionary relationships of many endemic taxa are controversial, as it is the case for members of the genus Handleyomys. Estimation of a time-calibrated hypothesis for the evolution of these six genera (Euryoryzomys, Handleyomys, Hylaeamys, Nephelomys, Oecomys and Transandinomys) supported a monophyletic Handleyomys sensu lato. Based on their distinctive morphology and the amount of inter-generic genetic divergence, Handleyomys sensu stricto, H. alfaroi, the H. chapmani, and the H. melanotis species groups warrant recognition as separate genera. In addition, species delimitation documents the existence of cryptic species-level lineages within H. alfaroi and H. rostratus. Cryptic lineages within H. rostratus exhibited significant niche differentiation, but this was not the pattern among species-level clades within H. alfaroi. Similarly, age-range correlations revealed that niche evolution within Handleyomys is not correlated with evolutionary time, instead, ancestral climate tolerance reconstructions show niche disparities at specific diversification events within the chapmani and melanotis species groups, while the climatic niche of the rest of species of Handleyomys tended to be conservative.
中美洲被认为是生物多样性热点地区，其特有种和物种多样性水平可能被低估。不幸的是，该地区仍在经历世界上最高的森林砍伐率之一。对于哺乳动物而言，许多特有分类群的进化关系存在争议，例如 Handleyomys 属的成员。对这六个属（Euryoryzomys、Handleyomys、Hylaeamys、Nephelomys、Oecomys 和 Transandinomys）的进化进行时间校准假设的估计支持了广义的 Handleyomys 单系性。基于其独特的形态和种间遗传分化程度，Handleyomys sensu stricto、H. alfaroi、H. chapmani 和 H. melanotis 物种群值得被确认为独立的属。此外，物种界定证明了 H. alfaroi 和 H. rostratus 内存在隐种水平的谱系。H. rostratus 内的隐谱系表现出明显的生态位分化，但在 H. alfaroi 内的种级分支中并非如此。同样，年龄范围相关性表明，Handleyomys 内的生态位进化与进化时间无关，相反，祖先气候耐受性重建表明在 chapmani 和 melanotis 物种群内的特定多样化事件中存在生态位差异，而 Handleyomys 的其余物种的气候生态位则趋于保守。
