Discovery of Two Lineages of Hynobius tsuensis (Amphibia, Caudata) Endemic to Tsushima Island, Japan

Niwa, Keita; Kuro-o, Masaki; Nishikawa, Kanto

doi:10.2108/zs200149

Cited by 6 publications

(14 citation statements)

References 43 publications

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“…The substitution rate of cyt b gene sequence for strict clock model was set as 0.64% substitutions per million years (MY) per lineage. Although this value is rate of mitochondrial ND2 gene of Salamandrid ( Weisrock et al, 2001 ), it has widely been applied to phylogenetic studies on Japanese salamanders of Hynobius ( Tominaga et al, 2006 ; Aoki, Matsui & Nishikawa, 2013 ; Matsui et al, 2017 , 2019 , 2020 ; Niwa, Kuro-o & Nishikawa, 2021 ). An MCMC run for 30 million generations was conducted with sampling every 5,000 generations.…”

Section: Methodsmentioning

confidence: 99%

“…The Tsushima salamander ( Hynobius tsuensis ), an endemic salamander to Tsushima Island, thus categorized as (4) noted above, was described by Abe (1922) . Recently, Niwa, Kuro-o & Nishikawa (2021) showed that there are two distinct groups within H. tsuensis based on the mitochondrial cytochrome b (cyt b ) gene and seven nuclear microsatellite loci, including Group A (probably, true H. tsuensis ), and Group B ( Hynobius sp.). Group B was phylogenetically closer to Hynobius nebulosus sensu stricto which distributed on Kyushu and its adjacent islands (excluding Tsushima Island) than to Group A ( Niwa, Kuro-o & Nishikawa, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the body coloration of the two groups is also distinctive. Group A showed a dark brownish dorsum with yellowish spots or a yellowish dorsum with dark spots, and the upper and lower edges of the tail were bright yellow, while Group B presented a brownish dorsum with dark stipples, and tail without bright yellow color ( Niwa, Kuro-o & Nishikawa, 2021 ). Although the two groups were discovered syntopically from same site (within 5 × 5 m) in the several streams in Tsushima Island, hybrids (including introgressive hybridization) between them were not found.…”

Section: Introductionmentioning

confidence: 99%

“…Although the two groups were discovered syntopically from same site (within 5 × 5 m) in the several streams in Tsushima Island, hybrids (including introgressive hybridization) between them were not found. Thus, these two groups (Group A and Group B) were considered to be actually different species ( Niwa, Kuro-o & Nishikawa, 2021 ). Niwa, Kuro-o & Nishikawa (2021) was the first report on the co-existing of two lotic salamanders of Hynobius in a small island.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, these two groups (Group A and Group B) were considered to be actually different species ( Niwa, Kuro-o & Nishikawa, 2021 ). Niwa, Kuro-o & Nishikawa (2021) was the first report on the co-existing of two lotic salamanders of Hynobius in a small island. However, the geographic distribution, population genetic, and underlying factors affecting the current distribution of these groups are still unclear.…”

Section: Introductionmentioning

confidence: 99%

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Differentiated historical demography and ecological niche forming present distribution and genetic structure in coexisting two salamanders (Amphibia, Urodela, Hynobiidae) in a small island, Japan

Niwa

Tran

Nishikawa

2022

PeerJ

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Background The climatic oscillations in the Quaternary period considerably shaped the distribution and population genetic structure of organisms. Studies on the historical dynamics of distribution and demography not only reflect the current geographic distribution but also allow us to understand the adaption and genetic differentiation of species. However, the process and factors affecting the present distribution and genetic structure of many taxa are still poorly understood, especially for endemic organisms to small islands. Methods Here, we integrated population genetic and ecological niche modelling approaches to investigate the historical distribution and demographic dynamics of two co-existing salamanders on Tsushima Island, Japan: the true H. tsuensis (Group A), and Hynobius sp. (Group B). We also examined the hypothesis on the equivalency and similarity of niches of these groups by identity and background tests for ecological niche space. Results Our result showed that Group A is considered to have undergone a recent population expansion after the Last Glacial Maximum while it is unlikely to have occurred in Group B. The highest suitability was predicted for Group A in southern Tsushima Island, whereas the northern part of Tsushima Island was the potential distribution of Group B. The results also suggested a restricted range of both salamanders during the Last Interglacial and Last Glacial Maximum, and recent expansion in Mid-Holocene. The genetic landscape-shape interpolation analysis and historical suitable area of ecological niche modelling were consistent, and suggested refugia used during glacial ages in southern part for Group A, and in northern part of Tsushima Island for Group B. Additionally, we found evidence of nonequivalence for the ecological niche of the two groups of the salamanders, although our test could not show either niche divergence or conservatism based on the background tests. The environmental predictors affecting the potential distribution of each group also showed distinctiveness, leading to differences in selecting suitable areas. Finally, the combination of population genetics and ecological modeling has revealed the differential demographic/historical response between coexisting two salamanders on a small island.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Differentiated historical demography and ecological niche forming present distribution and genetic structure in coexisting two salamanders (Amphibia, Urodela, Hynobiidae) in a small island, Japan

Niwa

Tran

Nishikawa

2022

PeerJ

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Interspecific interactions between coexisting Siberian and Ezo salamander larvae examined by stable isotope analyses

Terui¹,

Furuta

Kohmatsu

et al. 2022

Limnology

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Comparative phylogeography reveals dissimilar genetic differentiation patterns in two sympatric amphibian species

PAN,

ZHANG,

OROZCO TERWENGEL

et al. 2023

Integr. Zool.

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Global climate change is expected to have a profound effect on species distribution. Due to the temperature constraints, some narrow niche species could shift their narrow range to higher altitudes or latitudes. In this study, we explored the correlation between species traits, genetic structure, and geographical range size. More specifically, we analyzed how these variables are affected by differences in fundamental niche breadth or dispersal ability in the members of two sympatrically distributed stream‐dwelling amphibian species (frog, Quasipaa yei; salamander, Pachyhynobius shangchengensis), in Dabie Mountains, East China. Both species showed relatively high genetic diversity in most geographical populations and similar genetic diversity patterns (JTX, low; BYM, high) correlation with habitat changes and population demography. Multiple clustering analyses were used to disclose differentiation among the geographical populations of these two amphibian species. Q. yei disclosed the relatively shallow genetic differentiation, while P. shangchengensis showed an opposite pattern. Under different historical climatic conditions, all ecological niche modeling disclosed a larger suitable habitat area for Q. yei than for P. shangchengensis; these results indicated a wider environment tolerance or wider niche width of Q. yei than P. shangchengensis. Our findings suggest that the synergistic effects of environmental niche variation and dispersal ability may help shape genetic structure across geographical topology, particularly for species with extremely narrow distribution.

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Discovery of Two Lineages of Hynobius tsuensis (Amphibia, Caudata) Endemic to Tsushima Island, Japan

Cited by 6 publications

References 43 publications

Differentiated historical demography and ecological niche forming present distribution and genetic structure in coexisting two salamanders (Amphibia, Urodela, Hynobiidae) in a small island, Japan

Differentiated historical demography and ecological niche forming present distribution and genetic structure in coexisting two salamanders (Amphibia, Urodela, Hynobiidae) in a small island, Japan

Interspecific interactions between coexisting Siberian and Ezo salamander larvae examined by stable isotope analyses

Comparative phylogeography reveals dissimilar genetic differentiation patterns in two sympatric amphibian species

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