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

DOI JASI Web Site 10 Citations 19 References

Bibliographic Information

Other Title
  • 北海道南西部磯焼け海域におけるホソメコンブ群落の形成機構
  • ホッカイドウ ナンセイブ イソ ヤケ カイイキ ニ オケル ホソメコンブ グンラク ノ ケイセイ キコウ

Search this article

Abstract

The barren ground, so-called Isoyake in Japanese, maintained at south-west coasts of the Sea of Japan, Hokkaido, Japan. In the Isoyake area, the sea urchin, Strongylocentrotus nudus, dominate on the bed rock, and occurrence of the kelp, Laminaria religiosa, was limited in the refuge at shallower zones. Fisheries in the coasts had large problem that the sea urchin could not grow up to the commercial size with inadequate foods. To develop the kelp forest technology in the Isoyake area, seasonal change of some environmental factors, water movement, water temperature, vegetation, and distribution of grazer, were observed continuously during 1998 to 1999 in Oshoro Bay. Environments for occurrence of kelp forest were characterized ; the sea urchins took refuge in deeper zone from strong water movement and buds of the kelp were protected from over grazing pressure during Winter. Moreover destructive pressure of the sea urchin occurred on kelp bed with no strong water movement and rock bed for kelp (amual algae) was protected from occupied of peremial algae during summer. We proposed two methods to increase the kelp forest in Isoyake area. 1) Seasonal control of excess grazing pressure using fence. 2) Adjust the depth with block and stone to remove the urchin by increasing velocity.

Journal

Citations (10)*help

See more

References(19)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top