2019 Fiscal Year Research-status Report
Diversification of feeding strategies and coexistence of cichlid fishes in African ancient lakes
| Project/Area Number |
18KK0208
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| Research Institution | Ryukoku University |
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Principal Investigator |
丸山 敦 龍谷大学, 理工学部, 准教授 (70368033)
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| Co-Investigator(Kenkyū-buntansha) |
畑 啓生 愛媛大学, 理工学研究科(理学系), 准教授 (00510512)
竹内 勇一 富山大学, 学術研究部医学系, 助教 (40508884)
ZIADI Fabienne 沖縄科学技術大学院大学, 物理生物学ユニット, 技術員 (00787294)
八杉 公基 宇都宮大学, 工学部, 研究員 (50722790)
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| Project Period (FY) |
2018-10-09 – 2022-03-31
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| Keywords | feeding morphology / laterality / African cichlid / micro CT / GIS / CCM |
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| Outline of Annual Research Achievements |
Fish specimen collection from the two target lakes was successfully done again in 2019. Foreign collaborators for the both lakes contributed a lot in the field and paper works. Drs Hori and Lake Biwa Museum also provided valuable specimens.
Analysis of feeding morphologies using micro CT is progressing as scheduled at OIST. Scanning of the model cichlid (scale-eating Perissodus microlepis) and some Malawian herbivorous species has been done. 3D image analysis is now performed using conventional landmarking and a novel approach.
Laterality studies are also well progressing, consisting of neuron study using P. microlepis and aquarium experiments examining "golden ages" of laterality. Academic papers are now prepared. Further live specimens are desired to be collected, but COVID-19 might delay fish import.
For 3D movie experiments in near future, 3D models are successfully made for the three Tanganiylan model speceis (P. microlepis, P. straeleni, Cyphotilapia frontosa). Recording of their behaviors is now performed, and facing some challenges.
Twenty-year-long census data from a rocky littoral zone in Laka Tanganyika was digitalized to used for GIS and CCM analyses, which are expected to reveal interspecific niche variation and interaction, respectively.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Scanning using micro CT takes long time, because machine time is limited. Nevertheless, we scanned a lot of specimens enough for the analysis of the first model fish. We have a plan to use another micro CT machine at Ryukoku University for further analysis.
COVID-19 has affected both collection and analysis of our live and fixed specimens. Our experiences of collaboration with researchers in Malawi and Zambia will become more essential than before.
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| Strategy for Future Research Activity |
Fish sampling will be continued in the both lakes, according to the prevailing laws (including those associated with COVID-19). Micro CT scanning will be done, possibly using two machines at OIST and Ryukoku, followed by the 3D image analysis to find out intra and inter-species morphological variations. One or two paper(s) of laterality study will be submitted hopefully in 2020. CCM, GIS, and 3D model studies will be hopefully finalized by the end of 2020.
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| Causes of Carryover |
メソッドの最適化や新たなコラボレーションによる経費の削減、COVID-19等による一部計画の縮小や先送りなどによって、建設的に次年度使用額が生じている。次年度には、社会情勢が許す範囲で、時間対効果を最大化する方向で使用する。
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Research Products
(5 results)
