青森県日本海沿岸および陸奥湾の棘皮動物相

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  • Echinoderm Fauna in Japan Sea and Mutsu Bay of Aomori Prefecture
  • アオモリケン ニホンカイ エンガン オヨビ ムツワン ノ キョクヒ ドウブツソウ

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The author surveyed echinoderm fauna in Japan Sea and Mutsu Bay of Aomori Prefecture at June and July of 2010. In result, the following species were found: (1) Asterina pectinifera, (2) Astropecten scoparis, (3) Astropecten polyacanhus, and (4) Hemicenrotus pulcherrimus. The above 1, 2 and 3 are asteroids and 4 is echinoid. The common echinoid, Strongylocentrotus nudus, was not found, but the echinoid is commonly found in Tottori Pref., Shimane Pref. and Yamaguchi Pref. The author obtained the four-sided (four arms) type Asterina pectinifera at Kitakanegasawa Bay in Fukaura and at Aka-ishi Bay in Ajigasawa. I suggested that the species (Fig. 3) cut the two arms of five arms and the species (Fig. 4) is mutation. Further, Asterina pectinifera (Fig. 2) collected at Fukaura Marine Station died in only one day in sea-water. The results show that it is caused by the upwardness of marine temperature and the extensive marine pollution in Japan Sea and Mutsu Bay of Aomori Prefecture.

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