Kanto Nishikawa

Kanto Nishikawa
Kyoto University | Kyodai · Graduate School of Human and Environmental Studies

Ph. D.

About

189
Publications
61,583
Reads
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2,115
Citations
Additional affiliations
May 2019 - June 2019
National Taiwan University
Position
  • Visiting Scholar
January 2014 - December 2014
Chinese Academy of Sciences
Position
  • Fellow
January 2001 - present
Kyoto University

Publications

Publications (189)
Article
Previous phylogenetic studies based on mitochondrial DNA data have consistently suggested that Hynobius tokyoensis consists of two major clades, clade A (northern clade) and clade B (southern clade). In this study, we newly estimated their population genetic structure and phylogenetic relationships by nuclear SNPs, and the results suggested heteros...
Article
The genus Rhabdias Stiles & Hassall, 1905 comprises lung parasites of amphibians and reptiles worldwide. In Japan, 9 species have been recorded, including Rhabdias incerta Wilkie, 1930 which has been reported only in Bufo species. In this study, to assess the diversity of R. incerta, we performed molecular analyses of Rhabdias species sampled from...
Article
Full-text available
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 bas...
Article
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...
Article
Full-text available
Biodiversity monitoring is important for the conservation of natural ecosystems in general, but particularly for amphibians, whose populations are pronouncedly declining. However, amphibians' ecological traits (e.g. nocturnal or aquatic) often prevent their precise monitoring. Environmental DNA (eDNA) metabarcoding-analysis of extra-organismal DNA...
Article
We developed eight novel microsatellite markers for the salamander Hynobius tsuensis, which is endemic to Tsushima Island, Japan. In H. tsuensis, the number of alleles, observed heterozygosity, and expected heterozygosity in each locus ranged from 1 to 10, 0.00 to 0.76, and 0.00 to 0.76, respectively. In cross-species amplification, five and four o...
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Full-text available
Competition within and among species can play a key role in structuring the assemblages of anuran tadpoles. Previous studies have reported that tadpoles of the invasive cane toad ( Rhinella marina ) are more strongly disadvantaged by the presence of native frog tadpoles than by the same number of conspecific toad tadpoles. That effect might arise f...
Article
Full-text available
Conservation of amphibians relies on the knowledge of the diversity and distribution patterns. To date, there is a lack of information on the diversity and distribution patterns of amphibians in some regions of Bangladesh, particularly the Northwest and Central areas. Thus, to contribute to the present knowledge on amphibians of Bangladesh, we surv...
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We describe a new species of the newt genus Tylototriton from Umphang Wildlife Sanctuary, Tak Province , western Thailand based on molecular and morphological evidence and named here as Tylototriton umphangensis sp. nov. The new species is assigned to the subgenus Tylototriton and differs from other species in having dark-brown to blackish-brown bo...
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Species identification using molecular techniques has recently become common for various taxa. Loop-mediated isothermal amplification (LAMP) is one of the easiest and least expensive molecular identification methods. Although few studies have developed LAMP assays for amphibians, we believe that LAMP is also useful for identifying endangered amphib...
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Full-text available
Herein, we provided a morphological description combined with a phylogenetic analysis of the northernmost Thai Tylototriton population, which was found in Doi Pha Hom Pok National Park (DPHPNP), Chiang Mai Province, northern Thailand. Three adult males were collected from a small breeding pond during our survey in July 2020. Based on molecular (two...
Preprint
Biodiversity monitoring is important for the conservation of natural ecosystems in general, but particularly for amphibians, whose populations are pronouncedly declining. However, amphibians ecological traits (e.g., nocturnal or aquatic) often prevent their precise monitoring. Environmental DNA (eDNA) metabarcoding-analysis of extra-organismal DNA...
Article
We evaluated the taxonomic status of the genus Megophrys in Sumatra using molecular and morphological data. Mitochondrial phylogenetic inference and morphological data revealed two undescribed species, one in southern Sumatra-M. selatanensis sp. nov. and one in northern Sumatra-M. acehensis sp. nov. We also detected a potential cryptic species with...
Preprint
Full-text available
Competition within and among species can play a key role in structuring the assemblages of anuran tadpoles. Previous studies have reported that tadpoles of the invasive cane toad ( Rhinella marina ) are more strongly disadvantaged by the presence of native frog tadpoles than by the same number of conspecific toad tadpoles. That effect might arise f...
Article
This study described the detailed osteological features of the Setouchi salamander Hynobius setouchi. H. setouchi, which is endemic to central Japan, was recently delineated from the wide range of H. nebulosus species based on molecular and external morphological characteristics. However, the osteological features of the species belonging to the ge...
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The first survey was conducted for helminth fauna of hybrid giant salamanders (hybrids between Andrias japonicus and other congeneric species), and introduced A. davidianus in Kyoto Prefecture, Japan. Three nematode species, Spiroxys hanzaki, Amphibiocapillaria tritonispunctati and Falcaustra sp., and one trematode species, Liolope copulans, were r...
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Full-text available
The Old World tree frog genus Chirixalus is distributed from northeastern India, southern China, continental Southeast Asia to Sumatra and Java. The species of this genus were previously assigned to the genera Chiromantis or Philautus. Here, we describe a newly discovered species of Chirixalus from Java. Chirixalus pantaiselatan, new species, is a...
Article
The genus Kalophrynus is represented by tiny to medium terrestrial or subfossorial frogs and is widely distributed in Southeast Asia. The diversity centre of this genus is Borneo, where almost half of all nominal species are distributed and all of these are endemic to this and the peripheral islands. Kalophrynus nubicola is the smallest species wit...
Article
Four new water mite species of the genus Hygrobates, subgenus Lurchibates (Acari, Hydrachnidia, Hygrobatidae) are described. Hygrobates (Lurchibates) macrochela sp. nov. Goldschmidt, Nishikawa & Shimano is described in male and female; Hygrobates (Lurchibates) malosimilis sp. nov. Goldschmidt, Nishikawa & Shimano is described in male, both new wate...
Article
Taxonomic identification of two Taiwanese salamanders, Hynobius sonani (Maki, 1922), and H. formosanus Maki, 1922, was clarified. Based on the descriptions and measurement data in the original description, we confirmed that H. sonani has been treated as H. formosanus and vice versa, which might have been caused by confusion of sampling localities o...
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Full-text available
Gunung Mulu National Park (GMNP) in northwestern Borneo is marked by high species diversity and diverse environments. We present one new amphibian and ten new reptile records from GMNP and its surrounding area. In the records, Asthenodipsas jamilinaisi and Garthius chaseni were newly recorded in the Sarawak State. We also present the first record o...
Article
The Tsushima salamander, Hynobius tsuensis, is a lotic-breeding species endemic to Tsushima Island, Japan. We investigated genetic variation in this species using samples covering all known localities on the island. Phylogenetic analyses based on mitochondrial cytochrome b gene sequences divided H. tsuensis populations into two genetic groups: true...
Article
We found a uniquely colored dicroglossid frog of the genus Occidozyga from western Sarawak, East Malaysia. It is divergent from other congeners in morphology and mtDNA sequences. In a molecular phylogeny, this species is the sister lineage to the continental species O. lima and O. martensii with weak support. The species is small with SVL 16-18 mm...
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The Dark-headed Cat Snake Boiga nigriceps is a poorly studied arboreal colubrid from Southeast Asia. In Kubah National Park, Malaysia, we radio-tracked two individual B. nigriceps for three and 13 days, respectively, to evaluate their movement, and we also obtained gut contents to assess their diet. Snakes were arboreal in 91% of telemetry fixes. T...
Article
Understanding environmental factor determining ecological niche is very important to elucidating the distribution of species, and also revealing how closely related species are able to coexist in a particular region. Here, we applied ecological niche modeling to develop the ecological niches of two hynobiid salamanders: Salamandrella keyserlingii a...
Article
We surveyed the genetic structure of Hynobius nigrescens Stejneger, 1907, a lentic breeding salamander widespread throughout montane and lowland regions of northeastern Japan. We performed a mitochondrial DNA analysis to explore intraspecific genetic variation and infer the evolutionary population history of H. nigrescens. Complete 1141 bp sequence...
Article
The red-bellied form of Calliophis intestinalis (Laurenti, 1768) sensu lato was originally reported from Pahang, west Malaysia. To determine the taxonomic status of this form, we examined the type specimens of Elaps sumatranus Lidth De Jeude, 1890, Calliophis intestinalis everetti (Boulenger, 1896), and Callophis furcatus var. nigrotaeniatus Peters...
Article
Viviparous reproduction has evolved independently more than 100 times in the evolutionary history of Squamata (lizards and snakes). Adaptation to cold climates is the dominant hypothesis explaining shifts to viviparity, but viviparous species are also present in the tropical lowlands, implying the presence of other factors that may also promote the...
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The jaws of vertebrates display a striking diversity in form and function, but they typically open and close like a trapdoor rather than sliding like a saw. Here, we report unique feeding behaviour in the blunt-headed snail-eating snake, Aplopeltura boa (family Pareidae), where the snake cuts off and circumvents the indigestible part (the operculum...
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We determined the complete mitochondrial genome sequences of two water mites, Hygrobates (Hygrobates) longiporus and H. (Rivobates) taniguchii. The length of the entire mitogenome of these two species is 13,721 bp and 13,770 bp long, respectively. Both of them contain 13 proteins, two rRNAs, and 22 tRNAs for a total of 37 gene products. The gene or...
Article
The hynobiid salamander genus Hynobius is a basal taxon in the urodeles that plays a key role in understanding the evolution of sexual dimorphism in urodeles. We examined the age (juveniles vs. adults) and sexual differences in the external and skeletal morphology of a Japanese lentic breeding salamander, Hynobius setouchi. We found that juveniles...
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Full-text available
A new species of the genus Tylototriton, obtained from Doi Phu Kha National Park, Nan Province, northern Thailand, is described based on molecular and morphological evidence and named herein as Tylototriton phukhaensis sp. nov. The new species is morphologically distinct from the four known Thai Tylototriton species (T. panhai, T. uyenoi, T. anguli...
Article
Micryletta inornata is a complex species that is widely distributed from Sumatra to mainland Asia, including the Thai-Malay Peninsula and Indochina. Recently, this species was confirmed to be endemic to regions near the type locality in Sumatra, and the populations from other regions were suggested to be different species. We examined phenotypic an...
Article
Hygrobates salamandrarum Goldschmidt, Gerecke and Alberti, 2002 (Acari, Hydrachnidia, Hygrobatidae) is the first-known water mite parasitizing adult newts. After its description, three further species of newt-parasitizing mites were described and the subgenus Lurchibates Goldschmidt and Fu, 2011 was proposed for the group, now containing four newt-...
Article
Males and females of three new water mite species of the genus Hygrobates Koch, 1837, subgenus Lurchibates Goldschmidt & Fu, 2011 (Acari, Hydrachnidia, Hygrobatidae) are described. The diagnosis of the subgenus is extended based upon the new material. The new species were all just found on one newt species each: Hygrobates (Lurchibates) intermedius...
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Full-text available
We report a second specimen of Xenophidion acanthognathus, collected from Lambir Hills National Park, Malaysian Borneo. We investigate the taxonomic status and relationship between this species and its only other congener X. schaeferi, as possible synonymy was suggested. Morphological and genetic analysis confirmed that X. acanthognathus and X. sch...
Article
The Asian newt genus Tylototriton, is the only urodelan genus currently recorded in Thailand. For a long time in the past, T. verrucosus was the sole known urodelan species found in Thailand, but was recently shown to be comprised of three cryptic species, T. uyenoi, T. anguliceps, and T. panhai. However, in our molecular study, the newts from Doi...
Article
Females of some Asian salamanders of the genus Hynobius deposit in streams their eggs embedded in a translucent envelope called an ‘egg sac’. The edges of the envelope exhibit a spectacular blue-to-yellow iridescent glow, which instantaneously disappears when the sac is removed from water. First, our scanning electron microscopy analyses reveal tha...
Article
Two lineages of stream toads in the genus Ansonia from Malaysian Borneo have long been suspected to be specifically distinct on the basis of molecular data. We assessed the taxonomic status of these lineages using morphological and additional genetic data. In mtDNA phylogeny, each lineage-one from Bario, Kelabit Highlands of Sarawak, the other from...
Article
We collected a specimen of a scincid lizard of Larutia Böhme, 1981 from the edge of a primary forest on Gunung Penrissen, Kuching Division, Sarawak, Malaysian Borneo. The single specimen of the new species differs from all other known congeners by the molecular divergence in the mitochondrial ND1 gene and morphological characters including small ad...
Article
A lotic-breeding salamander Hynobius stejnegeri, formerly called H. yatsui, from western Japan is revised based on genetic and morphological evidence, and three species are described: H. guttatus sp. nov. from Chubu-Kinki districts of Honshu Island, H. tsurugiensis sp. nov. from east highland of Shikoku Island, and H. kuishiensis sp. nov. from othe...
Article
The Ryukyu Archipelago, located at the southwestern part of Japan, is known as a group of continental islands and harbours many endemic taxa, supposedly reflecting its fairly long isolation from the Eurasian continent, Taiwan and the Japanese main islands. Microhyla okinavensis has been known as an endemic member of the terrestrial fauna of this ar...
Article
Full-text available
Amphibians and reptiles are highly speciose in tropics, and their species diversity reflects diversity of habitats then indicates present conservational status of environment. We, thus, conducted a survey of herpetofauna at Bako National Park, Sarawak, one of the oldest parks in Malaysian Borneo, and compared this new list with published works, for...