Evolutionary biologists are always interested in deciphering the geographic context of diversification,therefore they introduced the concept of comparative phylogeography, which helps to identify common mechanisms tha...Evolutionary biologists are always interested in deciphering the geographic context of diversification,therefore they introduced the concept of comparative phylogeography, which helps to identify common mechanisms that contribute to shared genetic structures among organisms from the same region.Here, we used multi-locus genetic data along with environmental data to investigate shared phylogeographic patterns among three Asianendemic newt genera, Cynops, Paramesotriton and Pachytriton, which occurred in montane/submontane streams or ponds in southern China. Our 222samples from 78 localities covered the entire range of the three genera and represented the largest dataset of this group to date. We reconstructed matrilineal genealogies from two protein-coding,mitochondrial genes, and gene network from two nuclear genes. We also estimated divergence times of major cladogenetic events and used occurrence data to evaluate niche difference and similarity between lineages. Our results revealed a common basal split in all three genera that corresponds to the separation of two geographic terrains of southern China.Those ancient divergence occurred during middle to late Miocene and likely correlate with paleoclimatic fluctuations caused by the uplift of the Qinghai-Xizang (Tibet) Plateau (QTP).Particularly,the strengthening and weakening of Asian summer monsoons during the Miocene may have profoundly impacted southern China and led to repeatedly vicariance in those newts.However,despite differences in realized niches between lineages,there is no evidence for divergence of fundamental niches.Preservation of old newt matriline lineages in mountains of southern China suggests that the region acts as both museums and cradles of speciation.Based on those results,we advocate a multi-pronged protection strategy for newts in the three genera.展开更多
n my country, as elsewhere nformation about animals. n the world, when one wants such as amphibians, one typically seeks out a field guide or a monograph. As the amphibian fauna around the world has grown （from about...n my country, as elsewhere nformation about animals. n the world, when one wants such as amphibians, one typically seeks out a field guide or a monograph. As the amphibian fauna around the world has grown （from about 4 000 species in 1985 to nearly 7 500 today）, the books, too, have become thicker, heavier, and more and more unwieldy. These books might contain features to assist identification-- written descriptions, keys, photographs and maps of the polygon variety and encompass known sites of occurrence. But the books quickly become out-of-date as knowledge increases and they rarely have information about phylogenetic relationships or display trees. But, we now live in a digital age, and young people, in particular, view books as old-fashioned and inadequate for their needs. The time is ripe for a new approach.展开更多
基金supported by the Strategic Priority Research Program,CAS (XDB31040202,XDA19050303)China’s Biodiversity Observation Network (Sino-BON),Digitalization,Development and Application of Biotic Resource (202002AA100007)+5 种基金Animal Branch of the Germplasm Bank of Wild Species,Chinese Academy of Sciences (Large Research Infrastructure Funding)National Natural Science Foundation of China (32170478)Yunnan FundamentalResearchProject(202001AW070016,202005AC160046)Young Talent Project of China Association for Science and Technology (2019-2021QNRC001)Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0501)supported by the CAS President’s International Fellowship Initiative (PIFI) to R.W.M.
文摘Evolutionary biologists are always interested in deciphering the geographic context of diversification,therefore they introduced the concept of comparative phylogeography, which helps to identify common mechanisms that contribute to shared genetic structures among organisms from the same region.Here, we used multi-locus genetic data along with environmental data to investigate shared phylogeographic patterns among three Asianendemic newt genera, Cynops, Paramesotriton and Pachytriton, which occurred in montane/submontane streams or ponds in southern China. Our 222samples from 78 localities covered the entire range of the three genera and represented the largest dataset of this group to date. We reconstructed matrilineal genealogies from two protein-coding,mitochondrial genes, and gene network from two nuclear genes. We also estimated divergence times of major cladogenetic events and used occurrence data to evaluate niche difference and similarity between lineages. Our results revealed a common basal split in all three genera that corresponds to the separation of two geographic terrains of southern China.Those ancient divergence occurred during middle to late Miocene and likely correlate with paleoclimatic fluctuations caused by the uplift of the Qinghai-Xizang (Tibet) Plateau (QTP).Particularly,the strengthening and weakening of Asian summer monsoons during the Miocene may have profoundly impacted southern China and led to repeatedly vicariance in those newts.However,despite differences in realized niches between lineages,there is no evidence for divergence of fundamental niches.Preservation of old newt matriline lineages in mountains of southern China suggests that the region acts as both museums and cradles of speciation.Based on those results,we advocate a multi-pronged protection strategy for newts in the three genera.
文摘n my country, as elsewhere nformation about animals. n the world, when one wants such as amphibians, one typically seeks out a field guide or a monograph. As the amphibian fauna around the world has grown （from about 4 000 species in 1985 to nearly 7 500 today）, the books, too, have become thicker, heavier, and more and more unwieldy. These books might contain features to assist identification-- written descriptions, keys, photographs and maps of the polygon variety and encompass known sites of occurrence. But the books quickly become out-of-date as knowledge increases and they rarely have information about phylogenetic relationships or display trees. But, we now live in a digital age, and young people, in particular, view books as old-fashioned and inadequate for their needs. The time is ripe for a new approach.
