Ecosystems, Conservation Biology, and Biodiversity Notes

Learning Goals & Outcomes

• Goal: Understand ecosystem dynamics, restoration ecology, conservation biology, and threats to biodiversity.

• Outcomes:

  • Importance of energy flow and chemical cycling.

  • Define gross/net primary production and limiting factors.

  • Explain secondary production, production efficiency, and ecological pyramids.

  • Key strategies in restoration ecology: bioremediation and augmentation.

  • Importance of biodiversity and ecosystem services.

Part 1: Energy Flow and Nutrient Cycling

• Ecosystem: Interactions of organisms and abiotic factors across various scales.

• Energy Flow: One-way movement through ecosystems; Chemical Cycling: Recycles within ecosystems.

• Conservation Laws:

  • Energy: Cannot be created or destroyed; transformed.

  • Mass: Matter is continually recycled; nutrients can be gained/lost.

  • Imbalance leads to limited production.

Trophic Levels

• Autotrophs: Producers that convert energy using photosynthesis/chemosynthesis.

• Heterotrophs: Consumers that rely on others for energy.

• Trophic Hierarchy:

  • Primary producers → Primary consumers → Secondary consumers → Tertiary consumers.

• Decomposers: Main energy source from nonliving organic matter, recycling elements.

Part 2: Primary Production Factors

• Primary Production: Energy converted to chemical by autotrophs over time.

• Energy Budgets: Solar radiation limits productivity, primarily in the tropics.

• Production Types:

  • Gross Primary Production (GPP): Total energy conversion.

  • Net Primary Production (NPP): New biomass added; calculated as NPP = GPP - ext{Respiration}

• Conclusion: Understanding these concepts helps clarify ecosystem functioning and conservation efforts.