Developmental study on the young sporophytes of Laminaria Japonica, Kjellmaniella crassifolia and Costaria costata at various temperature.

• Project/Area Number: 07660228
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: General fisheries
• Research Institution: HOKKAIDO UNIVERSITY
• Principal Investigator: YASUI Hajime Hokkaido Univ., Fac.Fish., Prof., 水産学部, 助教授 (00200494)
• Co-Investigator(Kenkyū-buntansha): YAMAMOTO Hirotoshi Hokkaido Univ., Fac.Fish., Ass.Prof., 水産学部, 教授 (00001610)
• Project Period (FY): 1995 – 1997
• Project Status: Completed (Fiscal Year 1997)
• Budget Amount: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 1997: ¥200,000 (Direct Cost: ¥200,000); Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000); Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
• Keywords: Laminaria japonica / Kjellmaniella crassifolia / Costaria costata / young sporophyte / water temperature / early development / growth / marine algae / コンブ科植物 / 胞子体 / 水温変化 / 水温変動 / 発生 / 褐藻

Research Abstract

Young sporophytes of three marine macroalgae, Laminaria japonica Areschoug, Kjellmaniella crassifolia Miyabe and Costaria costata (C.Agardh) Saunders (Phaeophyta, Laminariales) were observed at different temperature (5ﾟC,10ﾟC,15ﾟC,18ﾟC22ﾟC,25ﾟC) and at 10ﾟC after various water temperature treatments (15ﾟC・1-24h, 18ﾟC・1-24h, 22ﾟC・1-24h, 25ﾟC・1-24h) for about 30 days. Young sporophytes of three species grew normally at 5-15ﾟC,however, the growth rates of them at 18-22ﾟC dropped strongly. At higher temperature (18-25ﾟC in K.crassifolia, 22-25ﾟC in L.japonica and C.costata) , more than 70-90% of the sporophytes died. After various water temperature treatments in L.japonica (18ﾟC and 22ﾟC・ 6-12h) , K.crassifolia (22ﾟC・6-24h, 25ﾟC・3-6h) and C.costata (25ﾟC・3-6h) , most of the cells of sporophytes did not divid, but a few cells in L.japonica and K.crassifolia continued or restarted to divid normally.