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National Committee on Marine Sciences (NCMS)

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AGROVOC Keyword: search.filters.agrovoc.seasonalityGeographic name: search.filters.geographicname.Bolinao

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    Structure and temporal dynamics of macroinfaunal communities of a sandy reef flat in the northwestern Philippines
    Nacorda, Hildie Maria E.; Yap, Helen T. (Springer, 1997)
    Temporal variation in macroinfaunal community structure was assessed from monthly monitoring of the sandy substrate of the Lucero reef flat in Bolinao, Pangasinan (northwestern Philippines) between November 1990 and November 1991. The community was composed of 98 taxa from 10 phyla and was consistently dominated by the polychaete family Syllidae (19–33% of monthly total abundance). Five polychaete and crustacean taxa co-dominated with the syllids and exhibited monthly shifts in dominance ranks. Overall, there was no significant change in the composition of the community after a year. Results of the study show that the temporal dynamics of the community was a function of the seasonality in salinity and of the relatively consistent nature of the substrate. Abundances of macroinfaunal crustaceans, chaetognaths, and molluscs fluctuated significantly over 12 months, and corresponded to the seasonal fluctuation in salinity. Total and polychaete abundances did not show significant monthly variation, but tended to be influenced by salinity changes. Densities of turbellarians, nemerteans, and echinoderms appeared homogeneous across 12 months, and correlated with the consistency of substrate structure in the reef flat over the experimental period. In addition, sipunculid numbers seemed to be supported by the stable amount of organic matter in the sandy substrate.
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    Seasonality of standing crop of a Sargassum (Fucales, Phaeophyta) bed in Bolinao, Pangasinan, Philippines
    Trono, Gavino C.; Lluisma, Arturo O. (Springer, 1990-09)
    The seasonality of standing crop of a Sargassum bed was investigated by conducting monthly sampling from February 1988 to July 1989. Environmental parameters of water movement, salinity, number of daytime minus tides, and water temperature were also measured. An intra-annual pattern of variation in standing crop of Sargassum crassifolium, S. cristaefolium, S. oligocystum, and S. polycystum was observed. Standing crop was generally lowest in February, March, April, or May, and highest in November through January. Sargassum accounted for about 35 to 85% of the monthly algal standing crop of the bed, and the observed variation in overall standing crop of the bed generally reflected the standing crop of Sargassum. The seasonality of the standing crops of the associated algal divisions also followed an annual cycle, but their maximum and minimum standing crops did not coincide with those of Sargassum. Individually, as well as collectively, the standing crops of the Sargassum spp. were poorly correlated with the environmental factors observed.