ENIVRONMENT ASIA

Volume 14, No. 01, Month JANUARY, Year 2021, Pages 80 - 92

The impact of spatio-temporal variation on seawater quality and its eff ect on the domination of sargassum polycystum on small islands in western indonesian waters

I Ketut Sumandiarsa, Dietriech Geoff rey Bengen, Joko Santoso, and Hedi Indra Januar

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Sargassum sp. is one of the most diverse genera of brown seaweed and widely found in Indonesian waters. This study aimed to provide the latest information on the role of spatialtemporal variation on water quality in macroalgal assemblages in three diff erent locations in the western part of Indonesian waters, which are Tidung, Sebesi, and Bintan Islands. This research was conducted in two diff erent seasons in 2019. Multivariate analysis is used to determine the relationship between environmental characteristics and macroalgae diversity. The results showed that the parameters of nitrate, ammonia, and salinity diff ered signifi cantly between islands (p < 0.05). Besides that, seasons signifi cantly aff ected the dissolve oxygen (DO), temperature, salinity, selenium (Se), and iron (Fe) (p < 0.05). Variation in the concentrations of DO, nitrate, and ammonium nitrogen, and iron (Fe), are the characteristics of Bintan Island. Tidung Island is characterized by variations in salinity and the presence of element zinc (Zn). Sebesi Island shows identical variations in temperature, DO, copper (Cu), and manganese (Mn). It found that Sargassum polycystum was the most important species in all locations and seasons and was signifi cantly dominant in Sebesi and Bintan waters. It can be inferred that the high concentration of barium, copper, manganese, DO, and nitrate in the seawater could lead to the dominance of this species. The results demonstrate that spatio-temporal variations in the research locations had signifi cantly infl uenced the diversity of macroalgal assemblages in the western part of Indonesian waters.

Keywords

Macroalgae; Sargassum polycystum; Small Island; Spatio-temporal variations

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