Summary and Exam Tips for Ecology and Conservation
Ecology and conservation is a subtopic of Option C - Ecology and Conservation, which falls under the subject Biology in the IB DP curriculum. The distribution of species is influenced by limiting factors that can be either biotic or abiotic. Each species has a unique ecological niche, which determines its role and interactions within a community. Interspecific competition can lead to competitive exclusion or resource partitioning. Keystone species play a critical role in maintaining community structure. In ecosystems, organisms occupy different trophic levels, and biomass accumulation is influenced by respiration rates. Primary and secondary succession describe the development of communities over time. Human activities introduce alien species, which can become invasive, and pollutants that lead to biomagnification. Plastics in the ocean pose significant threats to marine life. Conservation efforts include in situ and ex situ strategies, focusing on maintaining biodiversity through species richness and evenness. Population ecology examines growth patterns, with exponential and logistic growth models. The nitrogen and phosphorus cycles are essential for nutrient cycling, but human activities can disrupt these processes, leading to issues like eutrophication.
Exam Tips
- Understand Key Terms: Familiarize yourself with terms like limiting factors, ecological niche, keystone species, and biomagnification. These are often tested in exams.
- Diagram Practice: Be able to draw and label diagrams of the nitrogen cycle and phosphorus cycle. Visual aids can help in understanding complex processes.
- Conceptual Clarity: Grasp the differences between in situ and ex situ conservation methods, and know examples of each.
- Application of Concepts: Practice applying concepts like competitive exclusion and resource partitioning to real-world scenarios.
- Succession Stages: Be clear on the differences between primary and secondary succession and the types of species involved in each stage.
