Unit 2395 - Community Ecology

1. Introduction to Community Ecology

• Definition of community ecology
• Key terms: community, population, ecosystem, niche, habitat
• Significance of studying biological communities
• Levels of biological organization within communities

2. Species Interactions

• Types of species interactions:
  • Competition (interspecific and intraspecific)
  • Predation
  • Mutualism
  • Commensalism
  • Amensalism and parasitism (brief mention)
• Influence of species interactions on:
  • Species diversity
  • Community structure and stability

3. Trophic Relationships and Food Webs

• Concept of trophic levels:
  • Producers (autotrophs)
  • Consumers (primary, secondary, tertiary)
  • Decomposers/detritivores
• Energy flow in ecosystems
• Food chains vs. food webs
• Ecological pyramids (numbers, biomass, energy)
• Interconnectedness and complexity of food webs

4. Biodiversity and Species Richness

• Definition and importance of biodiversity
• Measuring species richness and diversity indices
• Factors influencing biodiversity:
  • Habitat heterogeneity
  • Climate and environmental gradients
  • Human impacts (e.g., fragmentation, pollution)

5. Succession and Community Dynamics

• Definition of ecological succession
• Types of succession:
  • Primary succession
  • Secondary succession
• Role of pioneer species
• Changes in community composition over time
• Impact of disturbances (natural and anthropogenic)

6. Keystone Species and Ecosystem Stability

• Definition and examples of keystone species
• Role in maintaining community structure
• Concept of trophic cascades
• Consequences of loss of keystone species

7. Biogeography and Community Patterns

• Geographic factors affecting communities
• Biogeographic regions and their characteristics
• Island biogeography theory:
  • Species-area relationships
  • Effects of isolation and dispersal
• Patterns of species distribution and community composition

8. Human Impacts on Communities

• Habitat destruction and fragmentation
• Pollution effects on community health
• Climate change impacts
• Invasive species and their effects
• Conservation strategies:
  • Protected areas
  • Restoration ecology
  • Sustainable management practices