Introduction Many of the larger benthic marine algae are highly buoyant due to the presence of special gas-filled structures or pneumatocysts (Dromgoole 1981b) and others can achieve flotation äs a result of the accumulation of gases within the tissues (Müller-Stoll 1954). The possibility that buoyancy in some species may also be dependent on active selective ion accumulation or exclusion is Materials and Methods suggested by the fact that Valonia macrophysa Kiitzing Plant Material with a K/Na ratio of 5.7 sinks whereasHalicystis osterAll measurements of density or ionic composition were houtii Blinks and Blinks with a ratio of 0.03 floats made on freshly collected material which had been (Gross and Zeuthen 1948). stored in large volumes of natural seawater for less than Flotation in the larger algae may have ecologically signifi6 h at laboratory temperatures (18-20 °C). Care was cant consequences. For example, in Codium fragile (Sur.) taken to avoid using plants which may have experienced Hariot subsp. tomentosoides (Van Goor) Silva, mature a previous severe desiccation in the field. plants are apparently buoyant enough to "float" molluscs Drift material of C. fragile subsp. tomentosoides was from shellfish beds (Loosanoff 1975). The lifting power collected at two localities immediately
Botanica Marina – de Gruyter
Published: Jan 1, 1982
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