Sampling in Aquatic Environment

Sampling in Aquatic ecosystem
 SAMPLING IN AQUATIC ENVIRONMENT o Introduction o Types of aquatic environment o Organism sampled for in water body o Collection of water sample o Frequently measured physio-chemical parameters o Analysis of aquatic organisms
 CASE STUDY IV o Introduction. o Sampling of physio-chemical factors of the dam o Sampling of biological parameters o Prolems o conclusion
REFERENCES
Aquatic ecosystem AWBA RESEVOUR Introduction
An aquatic ecosystem is an ecosystem located in a body of water. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are marine ecosystems and freshwater ecosystems.

Types
Marine ecosystem
Marine ecosystems cover approximately 71% of the Earth's surface and contain approximately 97% of the planet's water. They generate 32% of the world's net primary production. They are distinguished from freshwater ecosystems by the presence of dissolved compounds, especially salts, in the water. Approximately 85% of the dissolved materials in seawater are sodium and chlorine. Seawater has an average salinity of 35 parts per thousand (ppt) of water. Actual salinity varies among different marine ecosystems.
Marine ecosystems can be divided into the following zones: oceanic (the relatively shallow part of the ocean that lies over the continental shelf); profundal (bottom or deep water); benthic (bottom substrates); intertidal (the area between high and low tides); estuaries; salt marshes; coral reefs; and hydrothermal vents (where chemosynthetic sulfur bacteria form the food base).
Classes of organisms found in marine ecosystems include brown algae, dinoflagellates, corals, cephalopods, echinoderms, and sharks. Fish caught in marine ecosystems are the biggest source of commercial