| Co-Investigator(Kenkyū-buntansha) |
NAKAHARA Hiroyuki Kyoto University Instructor, 農学部, 助手 (80026567)
OGAWA Hisao Tohoku University Instructor, 農学部, 助手 (20005656)
YAMAMOTO Hirotoshi Hokkaido University Associate Professor, 水産学部, 助教授 (00001610)
OHNO Masao Kochi University Professor, 海洋生物教育研究センター, 教授 (10036543)
OKUDA Takeo Kyushu University Professor, 農学部, 教授 (80038174)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Research Abstract |
Palawan and Mactan islands, northern Bohol and Zamboanga, Mindanao island in the Philippines were surveyed from October 7, 1987 to November 14, 1987 and from December 28, 1987 to February 14, 1988.
Eight(8) orders, 22 families, 48 genera and 87 species in the Rhodophyceae; 5 orders, 9 families, 22 genera and 55 species in the Chlorophyceae; 5 orders, 6 families, 12 genera and 30 species in the Phaeophyceae; 7 genera and 10 species of the seagrasses; and 39 genera and 96 species of marine phytoplaanton were collected from Palawan and Mindanao Islands. Several species of each group were new records to the two islands. Cell (or colony) numbers of phytoplankton per liter were 114-44,000. Water temperatures were 26.0-27.0 c and salinities 28.7-33.8%.
The fruiting period of seaweeds collected were assumed: (1) the period from October to January when Padina, Dictyota, Hormophysa and Sargassum were fertile; and (2) the another period when other species will become fertile.
The daily growth rates from July to October of brown and green strains in Eucheuma denticulatum were 3.54% and 3.31%, respectively and those of two strains of E. alvarezii were 4.66% and 3.59%, respectively. Maximum daily growth rates of Gracilaria verrucosa and G. salicornia were 16.4% and 10.1%, respectively in the intertidal zone, from August to September. The daily growth rates of two genera, Eucheuma and Gracilaria were lower in winter season (November to February or March). Standing crops of Sargassum communities in coral reefs ranged from nearly 5 kg to 15.6 kg (w.w.)/m^2 at Zamboanga, Mindanao.
Three species of Caulerpa (C. lentillifera, C. uvifera, C. racemosa) and rarely Gracilaria verrucosa are used as sea-vegetables by Palawan people.
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