Keragaman Alga Hijau (Chlorophyta) dan Alga Coklat (Phaeophyta) di Perairan Pantai Gamo Desa Sisarahili Gamo Kota Gunungsitoli Nias

Abstract

An experiment in Gamo Seashore, Sisarahili Gamo Village Gunungsitoli City Nias has been conducted to know green and brown algae diversity, physical and chemical parameters of water in corrrelation with the diversity of green and brown algae. Green and brown algae diversity assessed through “ line transect method” at three locations where twenty five plots (1 x 1 m) are positioned. All plots sampled during low tide. Two genera of both green algae and brown algae classified into four ordos and four families are recorded from the study area. The highest of species density, relative density and attendant frequency observed on Chaetomorpha crassa at the third location with the number 38,88 ind/m2, 74,43 % and 100 %, respectively and the lowest observed on Turbinaria sp. at the first location with the number 0,6 ind/m2, 3,30 % and 40 %, respectively. For the diversity index, the highest is recorded from the first location (0,99), while the lowest is found on the third location (0,55). The highest of equitability index was 0,79 at the third location and the lowest was 0,65 at the second location. Chemical and physical parameters (salinity, light penetration and light intensity) are evidently correlated with the green and brown algae diversity.