Comparative geographical analysis of the seaweeds that widely distributed all around Japanese shore by several approaches

2017 Fiscal Year Final Research Report

• Project/Area Number: 26440208
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: Ochanomizu University
• Principal Investigator: Shimada Satoshi お茶の水女子大学, 基幹研究院, 准教授 (40322854)
• Co-Investigator(Renkei-kenkyūsha): IWASAKI TAKATA 神奈川大学, 理学部生物科学科, 特別助教 (10636179)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 系統地理 / RAD-seq / STRUCTURE / 海藻類

Outline of Final Research Achievements

As a result of SSR analysis of brown alga Sargassum husiforme and RADseq analysis of brown alga Sargassum thunbergii and red alga Gelidium elegans, two big geographical group were detected: Kyushu, the Sea of Japan, Hokkaido group and Pacific group. These lineages were faced at Tohoku region of the Pacific coast. They were supposed to expand the distribution along a big ocean current (Tsushima Current, the Kurile Current, the Kuroshio Current). Genetic diversity was high in Kyushu, the Sea of Japan, and genetic diversity became low at the end of the distribution.
The growth properties about the water temperature were analyzed between three local population (Okinawa, Tateyama, Hakodate) of the brown alga Sargassum husiforme. As a result, the alga from Hakodate did not have high temperature tolerance, and, on the other hand, the low temperature tolerance was not different between the three localities. Culture strain of the brown alga from Okinawa performed similar growth properties.

Free Research Field

系統地理学、環境適応分子進化学