Unit 3009: Microbial Ecology

1. Introduction to Microbial Ecology

• Definition and scope of microbial ecology
• Diversity of microorganisms: bacteria, archaea, fungi, protists, viruses
• Microbial roles in ecosystems: decomposers, producers, symbionts
• Importance of microbial ecology in environmental and applied sciences

2. Microbial Interactions

2.1 Types of Interactions

• Competition: resource limitation and niche overlap
• Predation and parasitism: microbial predators and pathogens
• Mutualism: beneficial interactions and syntrophy
• Symbiosis: endosymbiosis and ectosymbiosis

2.2 Ecological Implications

• Influence on microbial community composition and dynamics
• Impact on ecosystem processes and nutrient cycling

3. Microbial Community Structure

3.1 Factors Influencing Community Composition

• Environmental conditions: pH, temperature, moisture
• Resource availability: nutrients and energy sources
• Spatial distribution and habitat heterogeneity

3.2 Methods to Study Community Structure

• Culture-dependent and culture-independent techniques
• Molecular methods: 16S rRNA gene sequencing, metagenomics

4. Microbial Diversity and Biogeography

4.1 Taxonomic Diversity

• Classification and identification of microbes
• Phylogenetic relationships

4.2 Functional Diversity

• Metabolic capabilities and ecological functions

4.3 Biogeographical Patterns

• Microbial distribution across habitats (soil, water, air)
• Geographic and environmental influences on microbial diversity

5. Microbial Metabolism and Nutrient Cycling

5.1 Metabolic Pathways

• Autotrophy and heterotrophy
• Aerobic and anaerobic metabolisms

5.2 Role in Biogeochemical Cycles

• Carbon cycle: decomposition, carbon fixation, methane production
• Nitrogen cycle: nitrogen fixation, nitrification, denitrification
• Phosphorus cycle: mineralization and immobilization

6. Ecological Succession in Microbial Communities

• Concept of ecological succession
• Pioneer species and community development
• Climax microbial communities
• Effects of environmental disturbances on succession

7. Microbial Adaptations to Extreme Environments

• Types of extreme environments: thermal vents, hot springs, polar ice, acidic/alkaline habitats
• Physiological and genetic adaptations
• Implications for astrobiology and the search for extraterrestrial life

8. Microbial Biotechnology and Environmental Applications

• Bioremediation: degradation of pollutants
• Biofuel production: microbial fermentation and algal biofuels
• Wastewater treatment: microbial consortia and processes
• Agricultural applications: biofertilizers, biocontrol agents

9. Global Change and Microbial Ecology

• Impacts of climate change on microbial diversity and function
• Effects of habitat destruction and pollution
• Microbial feedback mechanisms in climate regulation
• Strategies for conservation and mitigation of microbial ecosystem services