Seasonal Variations of Chlorophyll a and Environmental Factors off Shibetsu in the Nemuro Strait, Eastern Hokkaido

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  • 根室海峡標津沿岸域におけるクロロフィルa 並びに環境要因の季節変動
  • ネムロ カイキョウ シベツ エンガンイキ ニ オケル クロロフィル a ナラビニ カンキョウ ヨウイン ノ キセツ ヘンドウ

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Abstract

This study was carried out off Shibetsu in the Nemuro Strait from 2009 to 2013, to elucidate the seasonal variations of temperature, salinity, nutrients, and chlorophyll a. Every year, the study area was composed of water influenced by the Soya Warm Current Water in late spring to late fall, and by the East Sakhalin Current Water and Oyashio Water, cold currents, in late fall to spring. Nutrient concentrations were low in the warm-current period and high in the cold-current period. Large（＞10 μ m）diatom blooms were observed from February to May every year. The maximum chlorophyll a concentration in the blooms over the five years was 27μg L－1, although the maximum chlorophyll a concentrations in the blooms differed among various locations and years. Remarkable decreases were found in nutrient concentrations with the progress of the spring bloom ; nitrate was considered to be a limiting nutrient in the spring bloom. Large phytoplankton were dominant during the post-bloom to late fall in low-nutrient conditions, whereas phytoplankton were smaller（＜10μ m）during late fall to pre-bloom in high-nutrient en phytoplankton and nutrients.

Journal

  • Bulletin on Coastal Oceanography

    Bulletin on Coastal Oceanography 53 (1), 73-85, 2015

    Coastal Oceanography Research Committee, the Oceanographic Society of Japan

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