The widespread misconception about the Japanese major biogeographic boundary, the Watase line (Tokara gap), revealed by bibliographic and beta diversity analyses

  title={The widespread misconception about the Japanese major biogeographic boundary, the Watase line (Tokara gap), revealed by bibliographic and beta diversity analyses},
  author={Shohei Komaki and Takeshi Igawa},
The biota of the Japanese Archipelago is divided into the Palearctic and Oriental realms by the Watase line (Tokara gap), a major biogeographic boundary of Japan. This boundary is generally placed between Akusekijima and Kodakarajima Islands of the Tokara Archipelago, and has been the subject of many biogeographic debates. However, despite being widely accepted, the position of the boundary is doubtful because of a lack of clear evidence. Here, to verify the definition and existence of the… 
Widespread misperception about a major East Asian biogeographic boundary exposed through bibliographic survey and biogeographic meta‐analysis
The Watase line, a major biogeographic boundary between Palearctic and Oriental realms in East Asia, is generally drawn between Akuseki and Kodakara Islands of the Northern Ryukyu archipelago, Japan.
The potential role of temperate Japanese regions as refugia for the coral Acropora hyacinthus in the face of climate change
This study examined the genetic diversity and connectivity of the common reef-building coral Acropora hyacinthus along the Kuroshio Current, including recently expanded (<50 years) populations, and found the level of genetic diversity gradually decreased towards the edge of the species distribution.
Genetic divergence and range expansion in a western North Pacific coral.
Demographic Inferences and Loci Under Selection in a Recently Expanded Coral Population
Investigating population genomic patterns of the reef-building coral Acropora hyacinthus along a latitudinal cline that includes a well-established range expansion front in Japan using 2b-RAD sequencing finds evidence of bottleneck pressures associated with expansion events including higher clonality, increased linkage disequilibrium, and lower genetic diversity in range edge populations compared to core populations.
Revision of Japanese species of Nipponomyia Alexander, 1924 (Diptera, Pediciidae)
Two new species of the genus Nipponomyia Alexander are described from the Ryukyu Islands, with images of habitus and wings, illustrations of male and female terminalia, and distribution maps provided for the Japanese species.
Synopsis of the genus Ulomorpha Osten Sacken, 1869 (Diptera, Limoniidae) in Japan
A key to the four Japanese species of the Ulomorpha Osten Sacken genus is provided, with images of habitus and wings, and drawings of their male terminalia.


Divergence and Long-Distance Overseas Dispersals of Island Populations of the Ryukyu Five-Lined Skink, Plestiodon Marginatus (Scincidae: Squamata), in the Ryukyu Archipelago, Japan, as Revealed by Mitochondrial DNA Phylogeography
These populations are estimated to have diverged from their respective related spe cies in various ages of the Early to Late Pleistocene, suggesting that they colonized the islands by independent overseas dispersals of approximately 50–850 km via the Kuroshio Current.
Phylogeny and biogeography of the Viola iwagawae-tashiroi species complex (Violaceae, section Plagiostigma) endemic to the Ryukyu Archipelago, Japan
Divergence time estimations suggest that the Kerama Gap has been a long-term effective barrier to dispersal preventing gene flow across it, whereas recent dispersal over the Tokara Gap was inferred.
Molecular phylogeny and population structure of tideland snails in the genus Cerithidea around Japan
The lack of genetic divergence of Cerithidea largillierti between continental China and Japan suggests relatively recent migration between the Japanese Islands and the Asian continent.
Molecular phylogeography reveals an antitropical distribution and local diversification of Solenogyne (Asteraceae) in the Ryukyu Archipelago of Japan and Australia
Phylogenetic network analyses suggested that the ancestral lineage of S. mikadoi first colonized the southernmost island in the archipelago and then dispersed northward, indicating the antitropical distribution and Australian origin of Solenogyne.
Palaeogeographic reconstruction of the 1.55 Ma synchronous isolation of the Ryukyu Islands, Japan, and Taiwan and inflow of the Kuroshio warm current
In the Quaternary, the Ryukyu Islands evolved from a continental margin arc to an island arc by backarc spreading of the Okinawa Trough, accompanied by subsidence and isolation of the islands, a
Influence of Recent Geography and Paleogeography on the Structure of Reptile Communities in a Land-Bridge Archipelago
Abstract The herpetofauna of the Tuscan Islands (Central Italy) is well known and represents an ideal subject to understand the role of current and historical factors responsible for biogeographical
The Eurasian invasion: phylogenomic data reveal multiple Southeast Asian origins for Indian Dragon Lizards
Support for two independent colonizations of India from Eurasian ancestors during the early to late Eocene prior to the subcontinent’s hard collision with Eurasia is revealed.
Biogeography and origin of Lilium longiflorum and L. formosanum (Liliaceae) endemic to the Ryukyu Archipelago and Taiwan as determined by allozyme diversity.
The results suggest that L. longiflorum was established around the end of the Pliocene when the current distribution area was still a continuous part of the ancient Asian continent, and L. formosanum was derived from southern populations of L. LONGIFlorum around the late Pleistocene whenThe mainland of Taiwan was completely separated from the adjacent islands and the main continent.
Geographic patterns of endemism and speciation in amphibians and reptiles of the Ryukyu Archipelago, Japan, with special reference to their paleogeographical implications
  • H. Ota
  • Environmental Science
    Researches on Population Ecology
  • 2007
This paper analyzes the phylogeographical patterns of amphibian and reptile lineages distributed in the Ryukyu islands south of the Tokara Gap on the basis of relevant distributional data and