Effect of Marine Environment on Annual Changes in First Year Biomass of Saccharine japonica var. ochotensis at Rishiri Island, Japan

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  • SHINADA Akiyoshi
    Hokkaido Research Organization, Fisheries Research Department, Central Fisheries Research Institute
  • NISHIDA Yoshinori
    Hokkaido Research Organization, Fisheries Research Department, Central Fisheries Research Institute
  • KURIBAYASHI Takanori
    Hokkaido Research Organization, Fisheries Research Department, Central Fisheries Research Institute
  • GODA Hiroo
    Hokkaido Research Organization, Fisheries Research Department, Kushiro, Fisheries Research Institute
  • KAWAI Tadashi
    Hokkaido Research Organization, Fisheries Research Department Wakkanai, Fisheries Research Institute
  • AKAIKE Shoichi
    Hokkaido Research Organization, Fisheries Research Department Hakodate, Fisheries Research Institute

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Other Title
  • 海洋環境が利尻島の1年目リシリコンブ現存量に与える影響
  • カイヨウ カンキョウ ガ リジリトウ ノ 1ネンメ リシリコンブ ゲンソンリョウ ニ アタエル エイキョウ

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Abstract

Effect of marine environment on annual changes in first year biomass of Saccharina japonica var. ochotensis in summer (hereinafter referred to as Kelp biomass) were investigated from 1998 to 2010, at Rishiri Island, Japan. Relatively large fluctuations were observed for both Kelp biomass (mean 257g m^<-2>; range 0-1571g m^<-2>) and sea urchin biomass (mean 153g m^<-2>; range 40-348g m^<-2>) during study period. The correlation coefficient between Kelp biomass and sea urchin biomass was negative (r=-0.34, n=12, p=0.28). The relationship between Kelp biomass and each temperature from January to April was unclear. DIN (NO_3-N+NO_2-N) concentration decreased from January to April, on the other hand PO_4-P concentration was relatively uniform. Changes in the NP ratio from January to April indicated that exhaustion of DIN occurred in March and April. The correlation coefficient between Kelp biomass and DIN concentration in March was significantly positive (r=0.83, n=9, p<0.01). These results suggest that DIN concentration in March is limiting factor of Kelp growth at Rishiri Island. We use a generalized linear model (GLM) to statistically analyze the field survey data. The model using DIN concentration in March and sea urchin biomass as explanatory variable was selected by AIC. This result suggests that DIN concentration in March and sea urchin biomass are important for changes in first year biomass of Kelp at Rishri Island.

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