著者

西川 潮 東 典子 佐々木 進一 岡 智春 井上 幹生

出版者

日本甲殻類学会

雑誌

CANCER (ISSN:09181989)

巻号頁・発行日

vol.26, pp.5-11, 2017-08-01 (Released:2017-09-30)

参考文献数

22

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On 9 November 2016, an unknown Cambaridae crayfish was collected from the outflow stream of Matsubara Izumi along the Shigenobu River in western Japan. On the basis of COI and 12S rRNA analyses, we identified the crayfish as the Marmorkrebs (Procambarus fallax f. virginalis), which serves as the first record for this species from western Japan. The Marmorkrebs is widely available across Japan through the aquarium pet trade. Because the parthenogenic Marmorkrebs has high potential to impact biodiversity, fisheries, and rice farming in Japan through rapid proliferation, transmission of diseases, and herbivory, we call for urgent management plans to restrict the import, movement, and release of this crayfish.

著者

加藤木 侑一 松本 裕幸 髙橋 潤 東 典子 千葉 晋

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.77, pp.27-37, 2022-12-25 (Released:2023-01-27)

参考文献数

65

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The life history of Palaemon paucidens, a common freshwater shrimp inhabits many freshwater areas in Japan, remains unclear. In the present study, we surveyed a single population in a stream in Kesennuma, Miyagi Prefecture, Japan to elucidate the life history of this species. The spatio-temporal distribution pattern of the surveyed population was investigated in samples from seven stations established along the upstream and downstream sections of the stream. Size composition, state of sexual maturation, and appearance of hatched larvae were observed in samples collected from the mouth of the stream. Molecular species identification was used to confirm that the samples were P. paucidens. The results indicated that the total population consisted of three year-classes, and that many of the matured individuals (one or two years old) of both sexes seasonally migrated to the mouth of the stream. However, because some individuals remained in the freshwater area upstream, the migration of this species at our study site was partial. Larvae appeared at the same time as adults migrated downstream, and larvae hatched only at night. Based on age estimations in the field and the spawning intervals of females in a laboratory, it was peculated that two-year-old individuals would die after reproduction while one-year-olds would migrate upstream again. As the seasonal migration of both males and females corresponded to reproduction, we conclude that P. paucidens at our study site show diadromous migration and that their main migration pattern is catadromy.

著者

東 典子

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.81, no.3, pp.507, 2015 (Released:2015-06-05)

著者

厚東 典子

出版者

立教大学

雑誌

Aspekt : 立教大学ドイツ文学科論集 (ISSN:03876861)

巻号頁・発行日

no.36, pp.147-150, 2002

著者

J. Emmett Duffy 東 典子

出版者

エヌ・ティー・エス

雑誌

生物の科学「遺伝」 別冊 (ISSN:13407376)

巻号頁・発行日

no.16, pp.16-33,図巻頭1p, 2003-04