北海道南西沿岸域における磯焼けの機構解明とその対策に関する研究

DOI 日本農学文献記事索引 被引用文献1件
  • 桑原 久実
    独立行政法人水産 総合研究センター水産工学研究所

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  • Studies on Mechanisms for Kelp (Laminaria lerigiosa) Forest Development on the Barren Ground, Along the Southwest Coast of Hokkaido, Japan

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Barren ground, so-called Isoyake in Japanese, exists along the southwest coasts of Hokkaido, Japan. In the Isoyake area, the sea urchin, Storongylocentrotus nudus, dominates the bed rock, and occurrence of the kelp, Laminaria religiosa, was limited in the refuge at shallower zones. To develop the kelp forest technology in the Isoyake area, seasonal changes of some environmental factors, water movement, water temperature, vegetation, and grazers, were observed continuously during 1998 to 1999 in Oshoro Bay. Environments conducive to kelp forest were characterized ; sea urchins took refuge from strong water movement in deeper zones and.kelp buds were prptected from overgrazing during winter. We propose two methods to increase the kelp forest in Isoyake area : 1) seasonal control of excess grazing pressure using fences and, 2) adjustment of the depth with block and stone to remove urchins by increasing wave velocity.

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