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The River Basin  
 Introduction
Geography
Climate and Weather
Hydrology
Water Quality
Ecology and Biodiversity
 Ecology
 Aquatic Ecology
 Building Blocks
 Aquatic Habitats
 Life in Aquatic Ecosystems
 Food Chains and Webs
 Biomass and Production
Classification of Organisms
 Microorganisms
 Plants
 Invertebrates
 Vertebrates
 Fish Species
 Factors Affecting Ecosystems
 Wetlands
 Biodiversity
 Millennium Ecosystem Assessment
 References


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Ecology and Biodiversity: Life in Aquatic Ecosystems:

Classification of Organisms

   

Aquatic organisms can be classified into four major groups, varying in biological characteristics, habitat, and adaptations, but linked within a complex network of ecological roles and relationships:

The aquatic ecosystem of a river system is generally comprised of its fish, aquaticinvertebrates, riparian plants, and microorganism components. Key issues related to aquatic habitat and riparian vegetation are described below, in terms of system drivers and habitat response to stressors.

African Fish Eagle.
Source:De Wet 2006
( click to enlarge )
Small Mouth Yellowfish (Rubber Lips).
Source:Inkwazi Fly Fishing 2009
( click to enlarge )

 

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