Growth and Reproductive Pattern of Intertidal and Subtidal Sargassum (Sargassaceae, Phaeophyta) Populations in Bolinao, Pangasinan

Ariel Ortiz, Gavino Trono Jr.


First and second year populations of the Sargassum in the intertidal and subtidal portions of a seagrass bed were tagged and monitored over a period of 14 months (May 1996-June 1997). Statistical analysis (ANOVA and MANOVA) showed that there was a temporal variation in the thallus length of the Sargassum population between the intertidal and the subtidal regions (p<0.05). The subtidal population have longer thallus length than the intertidal population. Mean plant heights in the intertidal area (20.5 cm [1st year age group] and 25.0 cm [2nd year age group]) were significantly shorter than those in the subtidal region (26.0 cm [1st year age group] and 31.6 cm [2nd year age group]). Sargassum population in the intertidal region reached full maturity a month earlier (November) than those in the subtidal area (December). Peak fertility stage occurred in December for both regions.


Sargassum; growth rate; fertility; reproductive pattern; seasonality

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