Seasonal Variation in Biomass of Economic Seaweed Genus Caulerpa in Trang Province, Thailand
Keywords:
seasonal variation , biomass, economic seaweed , Trang provinceAbstract
Background and Objectives : The research investigated the seasonal variation in biomass of economic seaweed, Caulerpa, and monitored some water qualities that correlated to a variation of economic seaweed species at Trang province. Notably, the findings would benefit economic seaweed management in the local area, leading to sustainable utilization.
Methodology : Samples of Economic seaweed, Caulerpa were collected to determine biomass, and some water quality parameters were analyzed, covering the entire rainy season (September 2021), late rainy season (January 2022), and summer season (April 2022) from three different stations. Moreover, the correlation of water quality impacting seaweed biomass variation in Trang province was analysed.
Main Results : Two species of seweeds in the genus Caulerpa was found, namely Caulerpa lentillifera and Caulerpa racemosa var. corynephora. There were no seaweed specimens found at study sites in the rainy season, but their average dried-weight biomass was discovered in the late rainy season at 113.97 grams per square meters, and highest dried-weight biomass was in summer season at 251.56 grams per square meters. Considering a correlation between water quality and seaweed biomass, Caulerpa lentillifera exhibited a significantly positive correlation (r=0.694) with salinity at P<0.05. In contrast, a significant negative correlation (r= -0.752) was pH at P<0.05. Caulerpa racemosa var. corynephora showed a very significant negative correlation (r=-0.871) with water temperature at P<0.01. The other significant negative correlations, i.e., r = -0.719, r = -0.746, and r = -0.711, were water transparency, dissolved ammonia-nitrogen, and dissolved orthophosphate at P<0.05, respectively.
Conclusions : Caulerpa lentillifera and Caulerpa racemosa var. corynephora were found at the study sites. Both species were absent in the rainy season, but their biomass was discovered in the late rainy season, and the highest biomass was in summer season. Furthermore, salinity was a crucial parameter that might determine seaweed biomass, as increasing salinity related to increasing seaweed biomass.
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