Primary Productivity of Phytoplankton in Mandalika Coastal Area, Central Lombok Regency

Abstract

The research entitled "Primary Productivity of Phytoplankton in Mandalika Coastal Area, Central Lombok Regency" was conducted from March to August 2023. This study aims to analyze the primary productivity of phytoplankton and physical and chemical parameters in Mandalika Coastal waters at three different stations (Kuta Beach, Tanjung Aan, and Gerupuk Bay) using dark and light bottles. Based on the results of the study, it is known that Mandalika Coastal waters have phytoplankton primary productivity values ranging from 122.619 - 329.166 mgC/m2/day. The lowest productivity value (122.619 mgC/m2/day) occurs at station III classified as mesotrophic. Station III also has relatively lower physical and chemical parameter values such as an average pH of 7.7 mg/L and an average temperature of 29ºC compared to other stations. The highest productivity value (329.166 mgC/m2/day) occurred at Station II classified as eutrophic and Station I (189.285 mgC/m2/day) also classified as eutrophic. This is supported by pH worth 7.8 mg/L and temperatures ranging from 29.3 - 29.7 ºC, where the value is relatively higher than station III.