Evolutionary biology of enantiomorphy and mirror-image populations in tree snails.
| Project/Area Number |
13575005
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
生態
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| Research Institution | Shinshu University |
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Principal Investigator |
ASAMI Takahiro Shinshu Univ., Dept.of Biology, Associate Prof., 理学部, 助教授 (10222598)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Jin Shizuoka Univ., Dept.of System Engineering, Profes, 工学部, 教授 (10291957)
AOTSUKA Tadashi Tokyo Metropolitan Univ., Dept.of Biology, Assoc.Prof., 大学院・理学研究科, 助教授 (40106604)
ENDO Kazuoshi Univ.of Tsukuba, Dept.of Earth Sciences, Assoc.prof., 大学院・地球科学系, 助教授 (80251411)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 2003: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2002: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | left-right polarity / spiral cleavage / morphogenesis / enantiomorphy / gastropod / pulmonate / hermaphrodite / Thailand / 螺旋卵割 / 左右 / 進化 / 非対称 / 熱帯 / らせん |
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| Research Abstract |
We have succeeded in film recording a mating behavior that may explain how the enantiomorphy within species of tree snails Amphidromus. It is currently believed that the enantiomorphs could not achieve inter-chiral mating in the mode of face-to-face mating in which the two partners perform reciprocal matings simultaneously. Surprisingly we have discovered that one of chirally dimorphic species Amphidromus atricallosus copulates in this mode by means of field observations and experimental observations in the laboratory. The video-film analysis has confirmed their two-way copulation in the face-to-face position.
According to our analysis of visual information based on photographs and video images, it is clear that the enantiomorphs with left-right reversed genitalia can perform reciprocal insertion of penes which are supposed to be physically hardly possible. Therefore, the current results have exposed a new question ; how do they achieve the reciprocal copulation between the enantiomorphs simultaneously. We have not detected any uniqueness in their behavior that exhibit a typical face-to-face mating. Instead, the visual record suggests that they may have genitalia and insertion behavior that allows them to copulate each other by overcoming the physical constraint.
The results of molecular phylogenetic analysis have demonstrated that the chirally dimorphic group of species is monophyletic. At the initial divergence of the ancestor of the group from a dextral species, the enantiomorphy has evolved as the ancestral state maintained throughout the radiation of the genus Amphidromus. This pattern of chiral divergence suggests that the enantiomorphy within populations could be maintained by evolutionary acquisition of a particular character.
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Report
(4 results)
Research Products
(44 results)
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[Journal Article] The Drosophila obscura species-group (Diptera, Drosophilidae) from Yunnan Province, Southern China.2003
Author(s)
Gao, J-j., Watabe, H., Toda, J.M., Zhang, Y-p., Aotsuka, T.
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Journal Title
Zool.Sci. 20
Pages: 773-782
NAID
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[Journal Article] Effects of ammonium concentration and dilution on the competition between the cyanobacterium Microcystis novacekii and the green alga Scenedesmus quadricauda.2003
Author(s)
Miyazaki, T., Takeya, K., Togashi, T., Nakagiri, N., Suzuki, T., Yoshimura, J.
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Journal Title
Proceedings of MODSIM 2003 2
Pages: 742-746
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[Journal Article] A role of a low-density species on the community outcomes in a model ecosystem.2003
Author(s)
Suzuki, T., Nakagiri, N., Tainaka, K., Togashi, T., Miyazaki, T., Yoshimura, J.
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Journal Title
Proceedings of MODSIM 2003 4
Pages: 1673-1678
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[Journal Article] The effect of mutualism on community stability.2003
Author(s)
Tainaka, K., Yoshida, N., Terazawa, N., Nakagiri, N., Hashimoto, T., Takeuchi, Y., Yoshimura, J.
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Journal Title
Journal of the Physical Society of Japan 72
Pages: 956-961
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[Journal Article] Simulation of mating behavior of gametes and the evolution of anisogamy in marine green algae : isogamy, slight anisogamy and marked anisogamy.2003
Author(s)
Togashi, T., Kaide, A., Miyazaki, T., Suzuki, T., Nakagiri, N., Yoshimura, J., Bartelt, J.L., Cox, P.A.
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Journal Title
Proceedings of MODSIM 2003 2
Pages: 736-741
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[Journal Article] Genotypic canalization and stability in the 50/50 sex ratio.2002
Author(s)
Amagai, H., Kawai, Nakagiri, N., Sakisaka, Y., Tainaka, K., Yoshimura, J.
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Journal Title
Proceedings of Two Symposia on Ecology and Evolution in VIII INTECOL (Sangaku Publisher)
Pages: 94-99
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[Journal Article] Marine molluscan and brachiopod fauna of Tanoura, Nagashima Island, kaminoseki-cho, Yamaguchi Prefecture, Japan.2001
Author(s)
Fukuda, H., Asami, T., Yamashita, H., Sato, M, Hori, S., Nakamura, Y.
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Journal Title
Yuriyagai 7
Pages: 115-196
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[Journal Article] Spatial heterogeneity in a grassland community : use of power law.2001
Author(s)
Shiyomi, M., Takahashi, S., Yoshimura, J., Yasuda, T., Tsutsumi, M., Tsuiki, M., Hori, Y.
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Journal Title
Ecological Research 16
Pages: 487-495
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