著者

Nakabo Tetsuji Nakayama Kouji Muto Nozomu Miyazawa Masayuki

出版者

Springer

雑誌

Ichthyological Research (ISSN:13418998)

巻号頁・発行日

vol.58, no.2, pp.180-183, 2011

被引用文献数

19

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田沢湖で絶滅した固有種クニマス(サケ科)の山梨県西湖での発見. 京都大学プレスリリース. 2011-02-22.

著者

Kai Yoshiaki Nakayama Kouji Nakabo Tetsuji

出版者

Springer Japan

雑誌

Ichthyological research (ISSN:13418998)

巻号頁・発行日

vol.58, no.4, pp.333-343, 2011-11-25

参考文献数

44

被引用文献数

1

著者

Nakabo Tetsuji Nakayama Kouji Muto Nozomu MIYAZAWA Masayuki

出版者

Springer Japan

雑誌

Ichthyological research (ISSN:13418998)

巻号頁・発行日

vol.58, no.2, pp.180-183, 2011-04-25

参考文献数

34

被引用文献数

6

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田沢湖で絶滅した固有種クニマス(サケ科)の山梨県西湖での発見. 京都大学プレスリリース. 2011-02-22.Oncorhynchus kawamurae (Osteichthyes: Salmonidae) (common name "Kunimasu"), a species endemic to Lake Tazawa, Akita Prefecture, Japan, was believed to have been extinct since 1940. However, nine specimens were discovered in March and April 2010 in Lake Saiko, Yamanashi Prefecture, one of the lakes to which eyed eggs of the species were introduced in 1935. These were identified as O. kawamurae because of having 47–62 pyloric caeca, 37–43 gill-rakers, a black-colored body, and spawning at 30–40 m depth in early spring, which are unique characteristics within Oncorhynchus. Furthermore, the distinctiveness of Kunimasu from sympatric kokanee (O. nerka) was supported by microsatellite DNA data.

著者

Kurihara Takeo Shikatani Mayu Nakayama Kouji Nishida Mutsumi

出版者

Zoological Society of Japan

雑誌

Zoological Science (ISSN:02890003)

巻号頁・発行日

vol.23, no.11, pp.999-1008, 2006-11

被引用文献数

11

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In many benthic organisms with a planktonic larval stage, local populations have different morphology. Such difference may arise from some of the following proximate mechanisms. “Local recruitment (LR)”: no larvae move between local populations, and segregated populations possess alleles coding for locally adaptive morphology. “Intragenerational selection (IS)”: larvae move between local populations, and individuals with alleles for locally adaptive morphology survive after recruitment. “Phenotypic plasticity (PP)”: larvae move between local populations and show phenotypic plasticity to adapt to a locality after recruitment. We examined which mechanism explains our finding that a planktonic developer Turbo coronatus coronatus (Gastropoda) had significantly longer spines on its shell on more exposed shores at scales of < 2 km. Experiments at Ishigaki Island, Okinawa, Japan, showed the following results. (a) Shorter- and longer-spined populations occurring within 2 km showed non-significant ϕ low st values (−0.0040 to 0.00095) for the mitochondrial DNA COI region. This suggests no segregation of the local populations, supporting the mechanisms IS and PP. (b) T. c. coronatus generated significantly longer spines 70 days after being transplanted to the habitat of a longer-spined population, supporting IS and PP. (c) Individuals caged in the sea for 79 days generated longer spines than individuals in the laboratory, supporting PP. In conclusion, shore-specific morphology of T. c. coronatus arises most likely from phenotypic plasticity and possibly from intragenerational selection.

著者

Kurihara Takeo Shikatani Mayu Nakayama Kouji NISHIDA Mutsumi

出版者

社団法人 日本動物学会

雑誌

Zoological science (ISSN:02890003)

巻号頁・発行日

vol.23, no.11, pp.999-1008, 2006-11-25

被引用文献数

11

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In many benthic organisms with a planktonic larval stage, local populations have different morphology. Such difference may arise from some of the following proximate mechanisms. "Local recruitment (LR)": no larvae move between local populations, and segregated populations possess alleles coding for locally adaptive morphology. "Intragenerational selection (IS)": larvae move between local populations, and individuals with alleles for locally adaptive morphology survive after recruitment. "Phenotypic plasticity (PP)": larvae move between local populations and show phenotypic plasticity to adapt to a locality after recruitment. We examined which mechanism explains our finding that a planktonic developer Turbo coronatus coronatus (Gastropoda) had significantly longer spines on its shell on more exposed shores at scales of < 2 km. Experiments at Ishigaki Island, Okinawa, Japan, showed the following results. (a) Shorter- and longer-spined populations occurring within 2 km showed non-significant ϕ low st values (−0.0040 to 0.00095) for the mitochondrial DNA COI region. This suggests no segregation of the local populations, supporting the mechanisms IS and PP. (b) T. c. coronatus generated significantly longer spines 70 days after being transplanted to the habitat of a longer-spined population, supporting IS and PP. (c) Individuals caged in the sea for 79 days generated longer spines than individuals in the laboratory, supporting PP. In conclusion, shore-specific morphology of T. c. coronatus arises most likely from phenotypic plasticity and possibly from intragenerational selection.