Density, biomass and frequency of three main species of Brown Algae

Abstract

A series of research cruises were carried out in intertidal zones of Sistan-o- Baluchestan province in 1998. Four region of Gwatr, Chabahar, Tang and Galak were selected as sampling stations to collect samples from brown algae consist of: Sargassum glaucescens, Cystoseira indica and Nizamuddinia zanardini. This study was done monthly in one year period and recorded parameters were density, frequency and biomass. The results showed that the mean relative density of Sargassum in Gwatr, Chabahar, Tang and Galak were estimated 22.17, 8.48, 6.74 and 7.74 %, and for Cystoseira indica were 43.18, 11.95, 22.37 and 37.71%, respectively. The algae of Nizamuddin zanardinii was found only in two regions of Chabahar and Tang with 32.85 and 50.48% of relative density. The minimum frequency of Sargassum was found from May to August and for Cystoseira Was from June to August with 12. 5q and for Nizamuddinia was in August-September with 0.0%. On the other hand, the maximum frequency for three species were recognized from October to February with 100.0% frequency for Sargassum and Cystoseira, and 50.0% for Nizamuddinia. Also, the annual wet biomass in regions or Gwatr, Chabahar, Tang and Galak were estimated separately for each species consist of: - Sargassum glaucescens with 626.9, 117.8, 183.4 and 42.5 g/m2 - Cystoseira indica with 739.9, 95.2, 504.5 and 436.7 g/m2 - Nizamuddinia zanardini with 1352.2 and 1208.5 g/m2 in two regions of Chabahar and Tang.