Comparative study on composition and abundance of major planktons and physico-chemical cha

Comparative study on composition and abundance

of major planktons and physico-chemical characteristics among two ponds and Lake Tana,

Ethiopia

Wondie Zelalem Amanu

【期刊名称】《海岸生命医学杂志（英文版）》 【年(卷),期】2015(000)011

【摘要】Objective:To evaluate the difference in physico-chemical characteristics, composition and abundance of plankton communities owing to the supplementary feed added in fish ponds as compared to Lake Tana.
Methods:Physico-chemical and biological data of plankton were collected from 3 studied sites from November 2008 to October 2009. Data were compared using One-wayANOVA to see the difference among sites. Diversity indices such as Margalef's index, Shannon-Wiener index, and evenness index were employed to describe the distribution of plankton community among the studied sites.
Results:ThepH value was remarkably higher in ponds water. However, conductivity and total dissolved solids were the highest in lake water. Nitrate concentration was relatively high in ponds. Zooplankton species richness was higher in lake water than ponds. The lake also had the highest mean value of both Shannon-Wiener index and evenness index in phytoplankton.
Conclusions:The results revealed that the