STUDIES ON THE FOULING ORGANISMS IN NYUURA BAY, FUKUI III : OBSERVATIONS ON THE ECOLOGY OF A CIRRIPED, BALANUS AMPHITRITE AMPHITRITE DARWIN

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  • 福井県丹生浦湾における汚損生物III. : タテジマフジツボの生態について
  • 福井県丹生浦湾における汚損生物-3-タテジマフジツボの生態について
  • フクイケン ニュウウラワン ニ オケル オソン セイブツ 3 タテジマフジツボ ノ セイタイ ニ ツイテ

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Abstract

YASUDA, Toru (Fisheries Experiment Station of Fukui Prefecture, Tsuruga, Fukui) Studies on the fouling organisms in Nyuura bay, Fukui III. Observations on the ecology of a cirriped, Balanus amphitrite amphitrite DARWIN. Jap.J.Ecol., 18,27-32 (1968). Balanus amphitrite amphitrite DARWIN is a dominant species among acorn barnacles in Nyuura Bay and its vicinity, and one of the most harmful fouling animals in the area. During the period of observation from July 1965 to July 1966,the pelagic larvae of cirripeds, supposedly those of B.amphitrite amphitrite, occurred in the plankton samples taken from various spots in the bay, from late June to late December, during which the temperature at one meter depth varied from 10℃ to 28℃. The maximum occurrence of pelagic larvae was found from August to October (18℃ to 28℃ 1m). This suggests that the spawning season of this species continues from late June to late December with the maximum spawning in August-October. B.amphitrite amphitrite settled on suspended plates and gradually decreased in number from the head to the mouth of the bay, and the number was always largest at 1 m depth through the vertical range of 0-5 meters. Pelagic larvae of B.amphitrite amphitrite settled more abundantly on the plates colored dark such as black or red than on the plates colored light such as blue, green or white.

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