Two new Salamanders of the genus Onychodactylus from Eastern Honshu, Japan (Amphibia, Caudata, Hynobiidae)

Yoshikawa, Natsuhiko; Matsui, Masafumi

doi:10.11646/zootaxa.3866.1.3

Cited by 13 publications

(2 citation statements)

References 19 publications

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“…This latter definition is less conservative than the former. We excluded cases where one or two individuals exhibited cyto-nuclear discordance between markers such as allozymes and mtDNA (as observed for members of Sirenidae 56 , and several Hynobiids [57][58][59][60] ), as we did not perceive these cases to meet the criteria of substantial and replicated genealogical discordance. Although inference of hybridization via the detection of genealogical discordance warrants caution, our narrow definition of hybridization does not recognize these species as hybridizable.…”

Section: Methodsmentioning

confidence: 99%

Hybridizing salamanders experience accelerated diversification

Patton

Margres

Epstein

et al. 2020

Sci Rep

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Whether hybridization generates or erodes species diversity has long been debated, but to date most studies have been conducted at small taxonomic scales. Salamanders (order Caudata) represent a taxonomic order in which hybridization plays a prevalent ecological and evolutionary role. We employed a recently developed model of trait-dependent diversification to test the hypothesis that hybridization impacts the diversification dynamics of species that are currently hybridizing. We find strong evidence supporting this hypothesis, showing that hybridizing salamander lineages have significantly greater net-diversification rates than non-hybridizing lineages. This pattern is driven by concurrently increased speciation rates and decreased extinction rates in hybridizing lineages. Our results support the hypothesis that hybridization can act as a generative force in macroevolutionary diversification.

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Section: Methodsmentioning

confidence: 99%

Hybridizing salamanders experience accelerated diversification

Patton

Margres

Epstein

et al. 2020

Sci Rep

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“…Clades A1 and A2, distributed in the Tohoku region, shrank their ranges into refugia and expanded after the glacial period. Some amphibians with overlapping distribution with toads also diverged in the Tohoku region ( Sumida & Ogata, 1998 ; Yoshikawa et al, 2008 ; Aoki, Matsui & Nishikawa, 2013 ; Tominaga et al, 2013 ; Yoshikawa & Matsui, 2014 ; Matsui et al, 2020 ). Although divergence times did not coincide, the maintenance of genetic structures within the Tohoku region suggests the presence of multiple refugia for amphibians in this region.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity and demography of Bufo japonicus and B. torrenticola (Amphibia: Anura: Bufonidae) influenced by the Quaternary climate

Fukutani

Matsui

Tran

et al. 2022

PeerJ

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The Quaternary climate affected the present species richness and geographic distribution patterns of amphibians by limiting their activities during the glacial period. The present study examined the phylogenetic relationships of Japanese toads (Bufo japonicus and B. torrenticola) and the demography of each lineage from the past to the present based on mitochondrial sequences and ecological niche models. Japanese toads are a monophyletic group with two main clades (clades A and B). Clade A represents B. j. formosus, including three clades (clades A1, A2, and A3). Clade B contains three clades, two of which corresponded to B. j. japonicus (clades B1 and B2) and the other to B. torrenticola. Clade B2 and B. torrenticola made a sister group, and, thus, B. j. japonicus is paraphyletic. Clades A and B diverged in the late Miocene 5.7 million years ago (Mya) during the period when the Japanese archipelago was constructed. The earliest divergence between the three clades of clade A was estimated at 1.8 Mya. Clades A1 and A2 may have diverged at 0.8 Mya, resulting from the isolation in the multiple different refugia; however, the effects of the glacial climate on the divergence events of clade A3 are unclear. Divergences within clade B occurred from the late Pliocene to the early Pleistocene (3.2–2.2 Mya). Niche similarity between the parapatric clade in clade B (clades B1 and B2) indicated their allopatric divergence. It was suggested that niche segregation between B. japonicus and B. torrenticola contributed to a rapid adaptation of B. torrenticola for lotic breeding. All clade of Japanese toads retreated to each refugium at a low elevation in the glacial period, and effective population sizes increased to construct the current populations after the Last Glacial Maximum. Furthermore, we highlight the areas of climate stability from the last glacial maximum to the present that have served as the refugia of Japanese toads and, thus, affected their present distribution patterns.

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