Abstract
Anzali International wetland is located in the south coast of the Caspian Sea. Physicochemical analysis and zooplankton survey of the wetland were carried out on monthly basis for the period of one year from January 2012 to December 2013 at 9 different stations of Anzali wetland and its related channel to the Caspian Sea. Water temperature of the wetland followed more or less similar trend as that of air temperature. pH determined alkaline nature of the wetland ranging between 7.05 to 9.47, dissolved oxygen was recorded in the range of 3.36 mg/l to 10.51 mg/l while other parameters recorded were water temperature (10 to 23 C), Nitrate (0.48 to 4.36 mg/l), Total Phosphates (0.15 to 0.67 mg/l), Salinity (220 to 692 mg/l), Electrical Conductivity (235 to 1369 μs/cm), TDS (246 to 1971 mg/l), BOD (2 to 36 mg/l) and COD (4 to 74 mg/l). During study period, total 60 species of zooplankton were identified in four main groups such as Protozoa (22 sp.), Rotifera (29 sp.), Copepoda (5 sp.) and Cladocera (4 sp.). The highest numbers of zooplankton were recorded in summer months and lowest in winter which is the second rainy season of this area. The water body is receiving domestic discharge, agricultural run-off and industrial wastes leading to large amount of nutrient inputs to the ecosystem which indicates the eutrophic statue of the wetland. The aim of present study was to investigate the interrelationship between physicochemical factors and zooplankton population in context of their seasonal abundance.
Highlights
Zooplankton is a very tiny organism found in every aquatic ecosystem
Experimental results from the Anzali wetland recommend that there are currently a lot of resources of industrial and agricultural run-offs and urban wastes which are discharging to the wetland and affecting the aquatic species abundance and diversity specially by unlimited volume of nutrients, which has led to undesired algal blooms, fish mortality, and loss of zooplankton population and diversity and would enter to the Caspian sea
This study pointed at the influence of physicochemical factors on zooplankton seasonal species abundance in Anzali International wetland
Summary
Zooplankton is a very tiny organism found in every aquatic ecosystem. D. Golmarvi et al 92 producer, they are the main energy transferor between primary producers and other levels of food chain including fish. Golmarvi et al 92 producer, they are the main energy transferor between primary producers and other levels of food chain including fish They are the most significant biotic organism influencing all the aspects of every aquatic ecosystem, such as food webs, energy and material cycle they have an undeniable role in natural and artificial fish nutrition. Anzali international wetland provides various ecological values that are frequently overlooked. Physicochemical factors such as temperature, pH, Do and electrical conductivity form part of abiotic elements of anaquatic ecosystem [2]. Intolerable levels of water temperature would limit the abundance of zooplanktons well as high pH levels may lead to the death of zooplankton, sensitivity to low amount of dissolved oxygen would influence on zooplankton various life stages and different biological functions including feeding, growth, and reproduction
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