A STUDY OF THE GENUS<i>EPHORON</i>FROM JAPAN (EPHEMEROPTERA, POLYMITARCYIDAE)

Ishiwata, Shin-ichi

doi:10.4039/ent128551-4

Cited by 20 publications

(32 citation statements)

References 6 publications

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“…Ephoron shigae is distributed widely in Japan, and also reported in Korea and Far East Russia (Fig. ) (Ishiwata, ). Nymphs of E. shigae develop during spring and summer, followed by emergence into adults (Watanabe & Ishiwata, ).…”

Section: Introductionmentioning

confidence: 94%

“…A, B, C)(Yabe, ; Nishikawa & Ito, ). Because E. eophilum does not occur in brackish conditions (Ishiwata, ; Aoyagi et al ., ; Tojo & Sekiné, ), the ancestral E. eophilum could not have inhabited the Paleo‐Tokyo Bay area before 0.10 Mya. Therefore, we present two alternative hypotheses: (1) E. eophilum sensu stricto has quite recently diverged from the common ancestor of E. eophilum and E. shigae after approximately 0.10 Mya and (2) before approximately 0.10 Mya, E. eophilum had a broader distribution within Japan than it currently does.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeography of the East Asian polymitarcyid mayfly genusEphoron(Ephemeroptera: Polymitarcyidae): a comparative analysis of molecular and ecological characteristics

Sekiné

Hayashi

Tojo

2013

Biol J Linn Soc Lond

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In East Asia, the mayfly genus Ephoron, a member of Polymitarcyidae, has been classified into three species: Ephoron eophilum, Ephoron limnobium, and Ephoron shigae. Using the nuclear histone 3 and internal transcribed spacer 1 and mitochondrial 16S rRNA and cytochrome c oxidase subunit I genes, we investigated the phylogenetic relationships of these mayflies. Ephoron limnobium formed polyphyletic relationships within the clade of Japanese E. shigae and shared identical sequences with E. shigae, suggesting that E. limnobium is a synonym of E. shigae. Monophyly was supported in E. eophilum, Korean E. shigae, and E. limnobium + Japanese E. shigae. Ephoron eophilum that co-occurs with the other Ephoron species has several peculiar traits in its adult swarming period and karyotype. This suggests that both pre-and post-zygotic isolation are likely to have promoted speciation of these Ephoron species. The divergence between E. eophilum and E. shigae would have occurred from the late Late Miocene to Early Pliocene according to the Bayesian relaxed clock model calibrated using the mitochondrial substitution rate. The area currently inhabited by E. eophilum emerged above sea level some 0.1 Mya, suggesting that E. eophilum moved into this area from other areas that it occupied prior to this time.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Phylogeography of the East Asian polymitarcyid mayfly genusEphoron(Ephemeroptera: Polymitarcyidae): a comparative analysis of molecular and ecological characteristics

Sekiné

Hayashi

Tojo

2013

Biol J Linn Soc Lond

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“…1. The geographic distribution is updated with some new localities (in boldface type) after Watanabe and Ishiwata (1997) Ishiwata (1996) …”

Section: Origin Of Obligatory Parthenogenesismentioning

confidence: 99%

“…eophilum is restricted to certain areas in the Kanto plain, especially in the basin of the Tone-gawa River, while E. limnobium is endemic to Lake Biwa (Ishiwata 1996). E. shigae is distributed in wide areas of the islands of Honshu (northern limit: Kitakami-gawa River, Iwate Prefecture) and Shikoku, and the northern half of Kyushu Island (southern limit: Midori-gawa River, Kumamoto Prefecture) ( Fig.…”

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confidence: 97%

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Reproductive mode of the geographic parthenogenetic mayfly Ephoron shigae, with findings from some new localities (Insecta: Ephemeroptera, Polymitarcyidae)

2006

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The burrowing polymitarcyid mayfly Ephoron shigae is distributed widely in Japan. Some populations are bisexual, others are unisexual, and the distributions of the two types overlap broadly. Experimental evidence of parthenogenetic reproduction, long suspected in unisexual populations, is presented here, based on a comparative analysis of the developmental rate of fertilized and unfertilized eggs. The developmental rate of fertilized eggs from 20 mated females in a bisexual population was 98.4% ± 0.73% (mean ± SD), and no unfertilized eggs from 20 virgin females in that population developed. The developmental rates of unfertilized eggs in two unisexual populations were 89.0% ± 4.59% and 84.2% ± 1.96%, respectively. This article presents experimental evidence of geographic parthenogenesis in E. shigae and provides support for the previous interpretation. In addition, we discuss the relationship between the sex ratio of each population and the developmental rate of fertilized versus unfertilized eggs from the females in those populations.

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Biodiversity of Lake Biwa

Nishino

2011

Lake Biwa: Interactions Between Nature and People

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A STUDY OF THE GENUSEPHORONFROM JAPAN (EPHEMEROPTERA, POLYMITARCYIDAE)

Abstract: In the genus Ephoron of Japan three species are recognized: E. shigae (Takahashi), E. limnobium sp.nov., and E. eophilum sp.nov. This study includes a key to the species, a description of each species, and maps of species distributions.

Cited by 20 publications

References 6 publications

Phylogeography of the East Asian polymitarcyid mayfly genusEphoron(Ephemeroptera: Polymitarcyidae): a comparative analysis of molecular and ecological characteristics

Phylogeography of the East Asian polymitarcyid mayfly genusEphoron(Ephemeroptera: Polymitarcyidae): a comparative analysis of molecular and ecological characteristics

Reproductive mode of the geographic parthenogenetic mayfly Ephoron shigae, with findings from some new localities (Insecta: Ephemeroptera, Polymitarcyidae)

Biodiversity of Lake Biwa

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