Abstract
Kelombok Village, Lingga Regency is an island with a large water area (99% of the water area) and has a high wealth of biological resources, especially algae or seaweed. This research was conducted in the coastal waters of Kelombok Village with three stations (stations 1, 2, and 3), and two zones (tide zone and low tide zone). The research was carried out for one month, namely in January 2024. Sampling was carried out using the line transect technique. Data analysis was carried out descriptively. Based on the research results, it is known that 12 types of seaweed live in the coral coastal waters of Kelombok Village, consisting of 3 types of green algae (Chlorophyta), 4 types of brown algae (Phaeophyta), and 5 types of red algae (Rhodophyta). The abundance of seaweed in zone A is 99,913 ind /m2, and in zone B is 99,981 ind /m2. Water conditions were recorded for brightness 1-1,7 m, temperature 29-30,1 oC, salinity 29,5-30‰, current speed 0,071 m/sec, DO 6,78-7,23 ppm, depth 0,75-1,7 m, pH 7,8-8, nitrate 0,01 mg/l, and phosphate 0,073 mg/l.
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