Keragaman Makroalga di Pesisir Pantai Kecamatan Lahewa, Kabupaten Nias Utara

Abstract

The present study describe The diversity of macroalgae along the beach of Lahewa, the regency of North Nias to observe the diversity of macroalgae species and its correlation with marine physical-chemical factors. The research was conducted Line Transect method, took about 1 m of deepth along the beach, which determined into 3 station and did 3 times of sampling on each station. The result recorded 17 species of macroalgae were found, consist of 3 classes, 10 ordos and 11 families. The highest density of macroalgae among of all the research station was Halimeda opuntia, found in station 3 and the lowest one was Hypnea choroides found in station 1. The highest diversity index found in station 2 which 2,396 on point and the lowest one in station 1 which 0,953 on point. The highest similarity index found in station 3 which 0,186 on point and and the lowest one on station 1 which 0,158 on point. Temperature, DO, BOD5, pH, light penetration, nitrat, light intensity and current sea were strongly corellated with the diversity of macroalgae.