(13) (B4.2) - Ecological Niches - IB Biology (SL/HL)

Definition of Ecological Niche

  • An ecological niche refers to the role and position a species has in its environment, encompassing its habitat, resource use, and interactions with other organisms.

Components of Ecological Niches

  1. Habitat: The specific environment where a species lives.

  2. Role in the Ecosystem: How the species contributes to the ecosystem functions (e.g., predator, prey, decomposer).

  3. Resource Utilization: The types of resources the species needs (e.g., food, water, shelter).

Types of Niches

  • Fundamental Niche: The full range of conditions and resources a species could theoretically use.

  • Realized Niche: The actual conditions and resources a species uses, considering competition and other interactions.

Competition and Niche Differentiation

  • Interspecific competition: Competition between different species, often leads to niche differentiation to minimize overlap and resource competition.

  • Niche Partitioning: Different species evolve to utilize different resources or live in different habitats, thereby reducing competition.

Examples of Niches

  • Carnivores: Typically occupy a higher trophic level, consuming herbivores or other carnivores.

  • Herbivores: Occupy lower levels, consuming plants and serving as prey for carnivores.

  • Decomposers: Essential for nutrient cycling, breaking down organic matter.

Importance of Ecological Niches

  • Niche diversity is crucial for ecosystem stability and resilience. Diverse niches contribute to greater biodiversity.

  • Understanding niches aids in conservation efforts and habitat restoration.