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The association between Hydrozoa and their attachment substrata with special reference to algal substrata

The association between Hydrozoa and their attachment substrata with special reference to algal substrata

Bull Mar Biol Sta Asamushi 12(2/3): 75-92

Observations are presented on the associations between 27 species of Hydrozoa, of which 7 belong to Athecata and 20 to Thecata, and the substrata on which they occur, with particular reference to the algae. Hydrozoa are classified into groups in relation to algal substrata: Hydrozoa which do not select algal substrata; Hydrozoa which occur on both algal and other substrata; and Hydrozoa which occur only on algal substrata. There were observed 18 species of Hydrozoa attached to 38 species of algae and 2 of eelgrass. Two species of green algae, 14 of brown and 22 of red algae are recorded as the substrata of Hydrozoa. The data show that many of the Hydrozoa exhibit definite preferences to substrata for attachment. Some athecate hydroids show complete exclusiveness in substratum preference. A remarkable suitability of brown algae as substrata for hydrozoan attachment, especially those of Sargassaceae, is clearly shown. Furthermore, each species of Sargassaceae carries particular species of Hydrozoa. Since the hydrozoan species exhibit such marked preferences for their algal substrata, it is suggested that their distribution along the coast may be affected by that of the preferred algal species, within the possible range of distribution of Hydrozoa in relation to tidal effects.

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