Summary
Biodiversity refers to the variety of life forms within an ecosystem, evaluated at the levels of ecosystems, species, and genetic variation. It is crucial for ecosystem resilience and stability.
- Ecosystem — A self-contained community of organisms interacting with their environment.
Example: A forest with trees, animals, and microorganisms. - Niche — The role of an organism within its ecosystem.
Example: Bees pollinating flowers. - Species Diversity — The number of species and their relative abundance in an area.
Example: A rainforest with many different species of plants and animals. - Genetic Diversity — The variety of alleles within the genes of a species.
Example: Different dog breeds. - Random Sampling — A method where each member of a population has an equal chance of being included.
Example: Using a random number generator to select sampling locations. - Simpson’s Index of Diversity (D) — A measure of biodiversity considering species richness and evenness.
Example: A value close to 1 indicates high biodiversity.
Exam Tips
Key Definitions to Remember
- Ecosystem
- Niche
- Species Diversity
- Genetic Diversity
- Random Sampling
- Simpson’s Index of Diversity
Common Confusions
- Confusing species diversity with genetic diversity
- Misunderstanding the difference between random and systematic sampling
Typical Exam Questions
- What is an ecosystem? An interacting community of organisms and their environment.
- How is genetic diversity measured? By assessing the variety of alleles within a species.
- What does Simpson’s Index of Diversity indicate? It quantifies biodiversity, with values near 1 indicating high diversity.
What Examiners Usually Test
- Understanding of different levels of biodiversity
- Ability to explain sampling methods and their applications
- Interpretation of biodiversity indices and their significance
