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アザミサンゴ属の種内と種間の空間的遺伝構造および共生する褐虫藻の群集構成
https://doi.org/10.15102/1394.00000699
https://doi.org/10.15102/1394.0000069987df1f85-f548-422e-9011-b70c3f3100f7
名前 / ファイル | ライセンス | アクション |
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Full_Text (11.8 MB)
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Final_Exam_Abstract (42.9 kB)
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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公開日 | 2018-12-05 | |||||||
タイトル | ||||||||
言語 | ja | |||||||
タイトル | アザミサンゴ属の種内と種間の空間的遺伝構造および共生する褐虫藻の群集構成 | |||||||
タイトル | ||||||||
言語 | en | |||||||
タイトル | Spatial diversity structure in the coral genus Galaxea (Euphyllidae) and their associated Symbiodinium communities | |||||||
言語 | ||||||||
言語 | eng | |||||||
資源タイプ | ||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
資源タイプ | doctoral thesis | |||||||
ID登録 | ||||||||
ID登録 | 10.15102/1394.00000699 | |||||||
ID登録タイプ | JaLC | |||||||
アクセス権 | ||||||||
アクセス権 | open access | |||||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
著者 (英) |
Wepfer, Patricia H.
× Wepfer, Patricia H.
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抄録 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | The evolution and systematics of corals have been difficult to unravel despite being the fundament of one of the world's most charismatic ecosystems. Coral diversity and diversification processes are not well understood due to morphological plasticity, potential hybridization and generally high rates of dispersal. Both geographically and methodologically extensive studies are needed to improve our understanding of coral ecology and evolution, including spatial biodiversity processes involving hosts and their associated symbionts. This dissertation investigates coral evolution in three complementary studies using the genus Galaxea L. as a model. First, I ask whether endosymbiotic community composition differentiate among morphologically cryptic genetic lineages in G. fascicularis. The Symbiodinium ITS2-sequence was metabarcoded using next generation sequencing (NGS) and community assembly was analyzed with joint distribution models. Symbiodinium communities were found to cluster into three regular community types that cannot be explained by environment or host genotype, potentially indicating species interactions between Symbiodinium types. Second, I assessed how spatial connectivity between geographic populations corresponds to neutral differentiation on the subspecies level using population genomic methods. Coral populations from the Ryukyu archipelago, the Daito islands, and the Ogasawara Islands were characterized by restriction site-associated DNA sequencing (RAD) to investigate whether the Daito Islands could be a stepping stone between Ryukyu and Ogasawara. The Ogasawara population was found to be highly differentiated and to have diverged under little amounts of continuous gene flow since the early Pliocene. No stepping stone role of the Daito Islands was found and the Ogasawara population may receive most migrants from the Ryukyu Islands, which was consistent with the dispersal patterns predicted by a oceanographic dispersal model. Lastly, I investigated the evolutionary history in the genus Galaxea taking a phylogeographic approach. I asked whether the genetically well-differentiated and sympatric lineages within G. fascicularis in Okinawa maintain their separation over geographic space and to what extent their spatial distributions overlap in the genus distribution range. Galaxea field collections were gathered from across the Indo-Pacific, and complemented by museum specimens to increase geographical coverage. At the same time the relationship between genetic lineages and taxonomic species was evaluated based on five out of seven currently accepted species (G. fascicularis, G. astreata, G. cryptoramosa, G. paucisepta, G. horrescens). The genus Galaxea clustered into three highly divergent clades; one Indo-Pacific, one Pacific, and one basal small clade found in Chagos. All morphological species were part of the Pacific clade. Overall this study indicates spatial rather than ecological or symbiosis-related processes to drive diversification and that the current taxonomy does not reflect biological species in this genus. | |||||||
口頭試問日 | ||||||||
2018-09-20 | ||||||||
学位授与年月日 | ||||||||
学位授与年月日 | 2018-11-30 | |||||||
学位名 | ||||||||
学位名 | Doctor of Philosophy | |||||||
学位授与番号 | ||||||||
学位授与番号 | 甲第22号 | |||||||
学位授与機関 | ||||||||
学位授与機関識別子Scheme | kakenhi | |||||||
学位授与機関識別子 | 38005 | |||||||
学位授与機関名 | Okinawa Institute of Science and Technology Graduate University | |||||||
著者版フラグ | ||||||||
出版タイプ | VoR | |||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
権利 | ||||||||
権利情報 | © 2018 The Author |