Impact of physico-chemical parameters on composition and diversity of zooplankton community in Nozha hydrodrome, Alexandria, Egypt

Abstract

This study was carried out in Nozha hydrodrome, Alexandria, to assess the impact of physico-chemical parameters upon zooplankton community structure and diversity during the period from December 2015 to November. 2016. The results indicated that there were significant monthly variations in physical and chemical characteristics, such as water temperature, pH, dissolved oxygen, total alkalinity, total hardness, nitrite, nitrate, total nitrogen,orthophosphate and total phosphorus. Zooplankton were represented by fifteen genera belong to four groups. Rotifera constituted the main dominant group contributing 82.59% of the total zooplankton, followed by Copepoda (12.33%), Cladocera (3.886%) and Ostracoda (1.22%). The highest density of zooplankton was recorded during January (mean 2504.5 org/ l), while the lowest was found in July (mean 44.25 org/l).The data pointed out that the most effective water variables on composition and distribution of zooplankton were water temperature, total alkalinity, total hardness, ammonia, nitrite, nitrate and total nitrogen. The low value of Shannon diversity index, high value of some water parameters and dominance of pollution tolerant forms of zooplankton revealed that the hydrodrome is suffering from organic pollution.

Relationship Between Mercury Concentration in Water, Bottom Sediment And Two Mollusc Species (Crassostrea Gasar and Tympanotonus Fuscatus) From a Lagos Creek in Nigeria

“…The temperature range in the present study was within the tropical climate range of <40ºC for coastal waters as stated by FMENV (2001). The decrease or increase in water temperature depends mainly on the climatic conditions, sampling times, sunshine hours and affected by specific characteristics of water environment such as turbidity, wind force, plant cover and humidity (Ahmed et al 2017). Hydrogen ion concentration (pH) is the master control parameter in aquatic environment for the chemical and biological transformation of water.…”

Zooplankton Productivity Evaluation of Lentic and Lotic Ecosystem

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