Fossils, Molecules, Divergence Times, and the Origin of Lissamphibians

Marjanović, David; Laurin, Michel

doi:10.1080/10635150701397635

Cited by 174 publications

(256 citation statements)

References 85 publications

Supporting

Mentioning

240

Contrasting

Order By: Relevance

“…The time-calibrated tree is available in the electronic supplementary material, file S1, and the estimated topology and dates are congruent with several recent analyses [30,56,57] ), despite the higher richness in tropical regions (strongly suggesting ecological constraints on dispersal in this direction).…”

Section: Results (A) Tree-based Analysessupporting

confidence: 80%

Large-scale phylogenetic analyses reveal the causes of high tropical amphibian diversity

2013

View full text Add to dashboard Cite

Many groups show higher species richness in tropical regions but the underlying causes remain unclear. Despite many competing hypotheses to explain latitudinal diversity gradients, only three processes can directly change species richness across regions: speciation, extinction and dispersal. These processes can be addressed most powerfully using large-scale phylogenetic approaches, but most previous studies have focused on small groups and recent time scales, or did not separate speciation and extinction rates. We investigate the origins of high tropical diversity in amphibians, applying new phylogenetic comparative methods to a tree of 2871 species. Our results show that high tropical diversity is explained by higher speciation in the tropics, higher extinction in temperate regions and limited dispersal out of the tropics compared with colonization of the tropics from temperate regions. These patterns are strongly associated with climate-related variables such as temperature, precipitation and ecosystem energy. Results from models of diversity dependence in speciation rate suggest that temperate clades may have lower carrying capacities and may be more saturated (closer to carrying capacity) than tropical clades. Furthermore, we estimate strikingly low tropical extinction rates over geological time scales, in stark contrast to the dramatic losses of diversity occurring in tropical regions presently.

show abstract

Section: Results (A) Tree-based Analysessupporting

confidence: 80%

Large-scale phylogenetic analyses reveal the causes of high tropical amphibian diversity

2013

View full text Add to dashboard Cite

show abstract

“…This age and that recently estimated for the split between amphibians and amniotes (late Devonian; ref. 26) seem too old according to the fossil record (27). A Mesozoic origin for salamanders has been proposed based on the fossil record (28,29), and by most of the molecular studies available so far (19,24,25), although a late Paleozoic diversification of salamanders has also been suggested (23).…”

Section: Resultsmentioning

confidence: 99%

Rapid diversification and dispersal during periods of global warming by plethodontid salamanders

Vieites

Min

Wake

2007

Proc. Natl. Acad. Sci. U.S.A.

203

233

View full text Add to dashboard Cite

A phylogeny and timescale derived from analyses of multilocus nuclear DNA sequences for Holarctic genera of plethodontid salamanders reveal them to be an old radiation whose common ancestor diverged from sister taxa in the late Jurassic and underwent rapid diversification during the late Cretaceous. A North American origin of plethodontids was followed by a continentalwide diversification, not necessarily centered only in the Appalachian region. The colonization of Eurasia by plethodontids most likely occurred once, by dispersal during the late Cretaceous. Subsequent diversification in Asia led to the origin of Hydromantes and Karsenia, with the former then dispersing both to Europe and back to North America. Salamanders underwent rapid episodes of diversification and dispersal that coincided with major global warming events during the late Cretaceous and again during the Paleocene-Eocene thermal optimum. The major clades of plethodontids were established during these episodes, contemporaneously with similar phenomena in angiosperms, arthropods, birds, and mammals. Periods of global warming may have promoted diversification and both inter-and transcontinental dispersal in northern hemisphere salamanders by making available terrain that shortened dispersal routes and offered new opportunities for adaptive and vicariant evolution.historical biogeography ͉ paleogeography ͉ Plethodontidae dispersal ͉ salamander phylogeny ͉ phylogeny P lethodontidae, the most speciose family of salamanders, is also the most differentiated in morphology, ecology, and behavior. The family includes Ϸ68% of the extant described species of caudate amphibians (1). New analyses of mtDNA, nuclear DNA, and morphology (2-6) have achieved consensus on many aspects of phylogenetic relationships, but unresolved conflicts remain. The disjunct and highly asymmetric Holarctic distribution of the family, with Ϸ98% of the species in the Americas and a few in the Mediterranean region, has long been a biogeographic puzzle (7-9), with the debate centered on the timing and route of colonization of Eurasia (reinvigorated with the recent discovery of Karsenia, the first East Asian plethodontid; ref. 10

show abstract

“…In the analyses, we used the Aln-all and Alnpart datasets and employed seven calibration points as follows. (1) The split of Cryptobranchidae and Salamandroidae: ~151-170 million years ago (Ma), based on the fossil record of salamandroid-like Iridotriton (Evans et al, 2005) for the minimum bound and a proposed origin of caudate (Marjanović and Laurin, 2007) for the maximum bound. (2) The split of Cryptobranchidae and Hynobiidae: >145 Ma, based on fossil salamander Chunerpeton; according to Roelants et al (2007) and Zhang et al (2008), slightly younger date was applied compared with the original date suggested by Gao and Shubin (2003).…”

Section: Molecular Datingmentioning

confidence: 99%

Mitochondrial genomes and divergence times of crocodile newts: Inter-islands distribution of <i>Echinotriton andersoni</i> and the origin of a unique repetitive sequence found in <i>Tylototriton</i> mt genomes

et al. 2012

View full text Add to dashboard Cite

Crocodile newts, which constitute the genera Echinotriton and Tylototriton, are known as living fossils, and these genera comprise many endangered species. To identify mitochondrial (mt) genes suitable for future population genetic analyses for endangered taxa, we determined the complete nucleotide sequences of the mt genomes of the Japanese crocodile newt Echinotriton andersoni and Himalayan crocodile newt Tylototriton verrucosus. Although the control region (CR) is known as the most variable mtDNA region in many animal taxa, the CRs of crocodile newts are highly conservative. Rather, the genes of NADH dehydrogenase subunits and ATPase subunit 6 were found to have high sequence divergences and to be usable for population genetics studies. To estimate the inter-population divergence ages of E. andersoni endemic to the Ryukyu Islands, we performed molecular dating analysis using whole and partial mt genomic data. The estimated divergence ages of the inter-island individuals are older than the paleogeographic segmentation ages of the islands, suggesting that the lineage splits of E. andersoni populations were not caused by vicariant events. Our phylogenetic analysis with partial mt sequence data also suggests the existence of at least two more undescribed species in the genus Tylototriton. We also found unusual repeat sequences containing the 3′ region of cytochrome apoenzyme b gene, whole tRNAThr gene, and a noncoding region (the T-P noncoding region characteristic in caudate mtDNAs) from T. verrucosus mtDNA. Similar repeat sequences were found in two other Tylototriton species. The Tylototriton taxa with the repeats become a monophyletic group, indicating a single origin of the repeat sequences. The intraand inter-specific comparisons of the repeat sequences suggest the occurrences of homologous recombination-based concerted evolution among the repeat sequences.

show abstract

Fossils, Molecules, Divergence Times, and the Origin of Lissamphibians

Cited by 174 publications

References 85 publications

Large-scale phylogenetic analyses reveal the causes of high tropical amphibian diversity

Large-scale phylogenetic analyses reveal the causes of high tropical amphibian diversity

Rapid diversification and dispersal during periods of global warming by plethodontid salamanders

Mitochondrial genomes and divergence times of crocodile newts: Inter-islands distribution of <i>Echinotriton andersoni</i> and the origin of a unique repetitive sequence found in <i>Tylototriton</i> mt genomes

Contact Info

Product

Resources

About