Embryonic diapause at the early stages of development in rays (Myliobatoidei species) as an adaptation strategy to the environment
| Project/Area Number |
23380112
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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 | 一般 |
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| Research Field |
General fisheries
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| Research Institution | Nagasaki University |
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Principal Investigator |
YAMAGUCHI Atsuko 長崎大学, 水産・環境科学総合研究科, 教授 (10310658)
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| Co-Investigator(Kenkyū-buntansha) |
FURUMITSU Keisuke 長崎大学, 大学院・水産・環境科学総合研究科, 産学官連携研究員 (30554266)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2013: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2012: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2011: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
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| Keywords | 板鰓類 / 繁殖生態 / 温暖化 / 初期発生 / 休眠卵 / 胎仔 / トビエイ類 / 胚休眠 / 繁殖 |
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| Research Abstract |
The purpose of the present study was to elucidate the effects of global warming on environmental and reproductive adaptation strategies in rays. Thus, we evaluated the following hypothesis: Embryonic diapause in Myliobatoidei species is an adaptive strategy of southern-based species. We collected embryos at each developmental stage and fertilized eggs from six species. We examined these samples in detail and observed that embryonic diapause occurred during the early stages of development in at least four of the six species. These findings may suggest that embryonic diapause serves as an adaptive strategy for species that originate from tropical and sub-tropical regions to overcome the low water temperature condition of temperate regions to increase reproductive success.
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Report
(4 results)
Research Products
(49 results)
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[Presentation] Movement2013
Author(s)
Yamaguchi, A., Furumitsu, K., G. Kume
Organizer
seasonal migration and habitat use of sharks and rays in Ariake Bay on the western coast of Kyushu
Place of Presentation
IPFC Okinawa
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