Microorganisms of the Aquatic (Freshwater) Habitat

Microbial Ecology of Different Ecosystems
Structure of an Ecosystem
Types of Ecosystems
Freshwater Ecosystem
Microorganisms of the Aquatic (Freshwater) Habitat
Structure of Lentic Habitat
Biota of Lentic Habitat
Structure of the Lotic Habitat
Biota of Lotic Habitat
Marine Ecosystem
Physical and Chemical Characteristics of the Marine Environment
Structure of the Sea
Marine Ecosystem Upwelling
Significance of Upwelling

Microorganisms of the Aquatic (Freshwater) Habitat

Mi croorganisms of The Aquatic (Freshwater) Habitat

1. Bacteria Most aquatic bacteria are gram negative because of the following reasons.

Gram negative envelope is suited for the nutrient diluted environment (oligotrophic).

Important hydrolytic enzymes are retained in the periplasmic space rather than being excreted and lost to the aquatic environment as in gram positive bacteria.

Gram negative bacterial cell wall contains lipopolysaccharide (LPS) that protects the cell against toxic molecules like fatty acids and antibiotics. Specially found are Pseudomonas sp., Flavobacterium, Achromobacter and Alcaligenes, Vibrio sp., Acinetobacter, Staphylococcus sp. Bacteria in surface region are pigmented.

2. Molds Deuteromycetes members, Phycomycetes and Myxomycetes members are found in the marine environments.

3. Protozoa Species of Foraminifera and Rodidaxia and many ciliate species are common.

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Marine Ecosystem Downwelling General Characteristics of Sea Biota Marine Microbes Bacterial Flora of the Sea Functions of Marine Flora Estuarine Ecosystem Biota of Estuaries Mangrove Ecosystem Characteristic Features of Mangroves Zonation Biota of Mangrove Other Interrelated Ecosystems

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