On the Relation between the Appearance of Spores of the Laver (<i>Porphyra tenera</i>) and the Environmental Conditions-I

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  • アサクサノリ胞子の付着と海況について-I
  • アサクサノリ ホウシ ノ フチャク ト カイキョウ ニ ツイテ 1

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Abstract

It is said that the autumnal appearance or settlement of the spores of the laver (Porphyra tenera) are greatly affected by the hydrographical or atmospheric conditions. With a view to resolve this problem following experiments and observations were made for four years from 1951 to 1954 in Ise Bay.<br> 1) Daily collection and enumeration of the spores floating in the sea, from late September till early October.<br> 2) Setting the bamboo twigs daily in the sea for about a month from late September and enumerating the germlings appeared on them, ten days after setting up the twigs.<br> 3) Daily measuring the variation in the vertical distribution of the temperature and chlorinity of sea water at various depths in about 1-2 metres interval from the surface to the bottom up to a depth of 6 meters at high tide. In the meantime, the diurnal mean range of tides was computed from the records of Nagoya Harbour as obtained by the tide gauge.<br> As a result obtained from the above experiments and observations, it is suggested that the spores of the laver are apt to get afloat in large masses for one to five days after the occurrence of such vertical turbulance in the sea water as those which might have been raised by wind or tidal movement.

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