Abstract
Carposporophytic and tetrasporophytic plants of Gigartina canaliculata Harvey were collected between 1983 and 1985 in the Pacific waters of Baja California near Ensenada. The purpose of the study was to estimate the total number of spores liberated by each phase of the life history under laboratory conditions. Observations on the spore-shedding process also were made. A high reproductive potential was found in both phases. Nearly a million spores and sometimes more were released by each plant and > 60% of the spores were discharged during the first 4 days after collection. The total number of liberated spores and the duration of the expulsion period were greater for carposporophytic plants. Alternating peaks of high and low production of spores appeared to occur ≈ 3 days in both phases during the shedding period but this pattern was not always discernible. Individual carpospores and tetraspores were shed serially with mucilage from the reproductive organs.
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