Diversity of Phytoplankton in Iragbo Part of Yewa Lagoon, Southwest, Nigeria

摘要

A study of the diversity of phytoplankton in Iragbo part of Yewa Lagoon Lagos was conducted for six months, (December, 2012- May, 2013). The surface water transparency was (≥48.5) and showed direct relationship with phytoplankton abundance. A total of 4875 individuals of 77 phytoplankton species belonging to 6 divisions were identified. Phytoplankton biomass was high in the dry months than wet months. Phytoplankton chlorophyll-a value (0.004) was highest in January. The Centrales diatoms dominated the phytoplankton community. A total of 1475 individuals (30.8%) represents Bacillariophyta, while 635 (13.3%), 15 (0.3%), 2525 (52.8%), 115 (2.4%) and 20(0.4%) represents Chlorophyta, Chrysophyta, Cyanophyta, Euglenophyta, and Pyrrophyta respectively. Cyanophyta were the most abundant (52.8%) while Bacillariophyta had the highest species composition of 28 making up (36.4%) of the total species. Diversity was higher in dry months (≥3.42) than wet months (≤2.99). Chlorophyll-a abundance showed positive correlation with Chemical Oxygen Demand (COD), Dissolved Oxygen (DO) and Iron (Fe).