Palaeogeographic reconstruction of the 1.55 Ma synchronous isolation of the Ryukyu Islands, Japan, and Taiwan and inflow of the Kuroshio warm current

Osozawa, Soichi; Shinjo, Ryuichi; Armid, Alrum; Watanabe, Yasushi; Horiguchi, Toshiaki; Wakabayashi, John

doi:10.1080/00206814.2011.639954

Cited by 112 publications

(168 citation statements)

References 39 publications

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“…Although the precise border between these two faunal realms depends on the species examined, two gaps divide the Ryukyu Archipelago into three biogeographically classified regions: the Northern, Central and Southern Ryukyus (e.g., Ota, 1998). Recently, Osozawa et al (2012) revised previous geological studies and estimated the exact timing of the isolation of the islands in the Pleistocene. According to their study, islands of the Ryukyu Archipelago were connected to the continental margin until 2.0 Mya (million years ago), after which two embayments that subsequently became the Kerama and Tokara Gaps opened.…”

Section: Introductionmentioning

confidence: 97%

“…Moreover, the Yonaguni Gap that is located between Yonagunijima Island and Taiwan was also formed during this period, although Ota (1998) argued that Yonagunijima Island was connected to Taiwan in the Ionian (middle) Pleistocene. Osozawa et al (2013), reviewing DNA sequence data of four insect taxa, which included endemic species in the Ryukyu Archipelago, revealed that the main genetic divergences of butterflies (Pailio and Parides) and dragonfly (Anotogaster) fit the geological model of Osozawa et al (2012). In contrast, some species of the firefly genus Pyrocoelia, whose females have little migratory ability, show unexpectedly large genetic differences, and their separation is too old to be explained by the geological model of Osozawa et al (2012) based on the estimated divergence times.…”

Section: Introductionmentioning

confidence: 98%

“…Osozawa et al (2013), reviewing DNA sequence data of four insect taxa, which included endemic species in the Ryukyu Archipelago, revealed that the main genetic divergences of butterflies (Pailio and Parides) and dragonfly (Anotogaster) fit the geological model of Osozawa et al (2012). In contrast, some species of the firefly genus Pyrocoelia, whose females have little migratory ability, show unexpectedly large genetic differences, and their separation is too old to be explained by the geological model of Osozawa et al (2012) based on the estimated divergence times. These facts suggest that animals with rather weak mobility, such as most soil-dwelling animals, have diversified before the formation of the current straits.…”

Section: Introductionmentioning

confidence: 98%

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Phylogeographic Study of Whip Scorpions (Chelicerata: Arachnida: Thelyphonida) in Japan and Taiwan

Karasawa

Nagata²,

Aoki³

et al. 2015

Zoological Science

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Whip scorpions (Thelyphonida), comprising an order in the class Arachnida, are distributed from tropical to temperate zones. Two species occur exclusively in Japan and Taiwan, but the border of their distributional ranges is ambiguous in the Central Ryukyus (Japan). We collected new specimens from the Central Ryukyus and revealed that the border of distribution of the two species lies between the Central and Southern Ryukyus, i.e., the Kerama Gap. Moreover, the estimated divergence time (15.8 Mya) of the two species, based on the mitochondrial COI gene, was older than the recently estimated time (1.55 Mya) of formation of the Kerama Gap. These results highlight the risks of a priori assumption solely on the basis of geological data for applying it as a calibration point to some terrestrial animals in this region. Typopeltis stimpsonii was genetically divided into four lineages, two of which turned out to be endemic to the Okinawa Islands. All specimens from the main island of Japan and Shikoku were in one lineage, which was also found in the Amami Islands and Hachijojima Island. This suggests that these specimens may have been dispersed by human activity. Typopeltis crucifer included five genetic lineages. Species collected from Ishigakijima and Iriomotejima Islands were genetically diversified not between the borders of these islands but within Ishigakijima Island. This study also suggests that phylogenetic diversity of the species in the Southern Ryukyus have increased through two times of invasions from Taiwan.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Phylogeographic Study of Whip Scorpions (Chelicerata: Arachnida: Thelyphonida) in Japan and Taiwan

Karasawa

Nagata²,

Aoki³

et al. 2015

Zoological Science

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“…The deep ocean channels surrounding these islands separate (Yang et al, 1996). In contrast, all of the currently active volcanoes are in the Eastern chain (Green, Babuyan, Batan, Camiguin), where the majority of islands are younger and have origins in the Quaternary (<2.8 Myr) (Figure 1c) (Osozawa et al, 2012;Yang et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…(b) Predicted tree topology derived from the hypothesis of stepping-stone by island distance. (c) Predicted tree topology derived from the hypothesis of stepping-stone by island age (geological ages derived from Yang et al, 1996 andOsozawa et al, 2012). The islands of the Taiwan-Luzon volcanic belt only became subaerial c. 3 Ma (Yang et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Complex inter‐island colonization and peripatric founder speciation promote diversification of flightless Pachyrhynchus weevils in the Taiwan–Luzon volcanic belt

Tseng

Huang

Jeng

et al. 2017

Journal of Biogeography

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Aim: We investigated the spatial and temporal patterns of diversification among colourful and flightless weevils, the Pachyrhynchus orbifer complex, to test the stepping-stone hypothesis of colonization across the Taiwan-Luzon volcanic belt.Location: Southeast Asia.Methods: The phylogeny of the P. orbifer complex was reconstructed from a multilocus data set of mitochondrial and nuclear genes using maximum likelihood in RAxML and Bayesian inference in MRBAYES. Likelihood-based tests in CONSEL were used to evaluate alternative tree topologies. Divergence times were estimated in BEAST based on a range of mutation rates. Ancestral range and biogeographical history were reconstructed using Bayesian binary MCMC (BBM) methods in RASP and in BioGeoBEARS. Demographic histories were inferred using the extended Bayesian skyline plot (EBSP). Species boundaries were tested using BPP.Results: The phylogeny of the P. orbifer complex indicated strong support for seven recip- The statistically delimited seven cryptic species imply that the diversity of Pachyrhynchus from small peripheral islands continues to be largely under-estimated.Main conclusions: The non-linear, more complex spatial and temporal settings of the archipelago and stochastic dispersal were probable key factors shaping the colonization history of the P. orbifer complex. Speciation of the P. orbifer complex may have occurred only between islands, indicating that peripatric speciation through the founders of stochastic dispersals was the major evolutionary driver. K E Y W O R D Scryptic species, Kuroshio current, long-distance dispersal, oceanic islands, stepping-stone hypothesis, the Philippines, weevils

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Ghost introgression facilitates genomic divergence of a sympatric cryptic lineage in Cycas revoluta

Chang,

Nakamura,

Chao

et al. 2023

Ecology and Evolution

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A cryptic lineage is a genetically diverged but morphologically unrecognized variant of a known species. Clarifying cryptic lineage evolution is essential for quantifying species diversity. In sympatric cryptic lineage divergence compared with allopatric divergence, the forces of divergent selection and mating patterns override geographical isolation. Introgression, by supplying preadapted or neutral standing genetic variations, can promote sympatric cryptic lineage divergence via selection. However, most studies concentrated on extant species introgression, ignoring the genetic legacy of introgression from extinct or unsampled lineages (“ghost introgression”). Cycads are an ideal plant for studying the influence of ghost introgression because of their common interspecific gene flow and past high extinction rate. Here, we utilized reference‐based ddRADseq to clarify the role of ghost introgression in the evolution of a previously identified sympatric cryptic lineage in Cycas revoluta. After re‐evaluating the evolutionary independency of cryptic lineages, the group‐wise diverged single‐nucleotide polymorphisms among sympatric and allopatric lineages were compared and functionally annotated. Next, we employed an approximate Bayesian computation method for hypothesis testing to clarify the cryptic lineage evolution and ghost introgression effect. SNPs with the genomic signatures of ghost introgression were further annotated. Our results reconfirmed the evolutionary independency of cryptic lineage among C. revoluta and demonstrated that ghost introgression to the noncryptic lineage facilitated their divergence. Gene function related to heat stress and disease resistance implied ecological adaptation of the main extant populations of C. revoluta.

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Palaeogeographic reconstruction of the 1.55 Ma synchronous isolation of the Ryukyu Islands, Japan, and Taiwan and inflow of the Kuroshio warm current

Cited by 112 publications

References 39 publications

Phylogeographic Study of Whip Scorpions (Chelicerata: Arachnida: Thelyphonida) in Japan and Taiwan

Phylogeographic Study of Whip Scorpions (Chelicerata: Arachnida: Thelyphonida) in Japan and Taiwan

Complex inter‐island colonization and peripatric founder speciation promote diversification of flightless Pachyrhynchus weevils in the Taiwan–Luzon volcanic belt

Ghost introgression facilitates genomic divergence of a sympatric cryptic lineage in Cycas revoluta

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