This topic explores the ecosystem concept, focusing on energy flows, nutrient cycling, and the role of limiting factors in primary productivity. It examines the interdependence of abiotic and biotic elements and the impact of human activity on ecosystem structure and functioning.
Ecosystems are dynamic systems where living organisms (biotic components) interact with each other and their non-living environment (abiotic components). This topic explores the structure of ecosystems, including trophic levels, food webs, and nutrient cycles, and how energy flows through them. Understanding these interactions is crucial for grasping how ecosystems function, maintain balance, and respond to changes like human impact or climate change.
In the WJEC A-Level Geography specification, this topic forms the foundation for understanding global ecosystems, biodiversity, and sustainability. You will examine key processes such as photosynthesis, respiration, decomposition, and the cycling of carbon and nitrogen. These concepts are not only central to physical geography but also link to human geography through topics like resource management and environmental degradation.
Mastering this topic enables you to analyse real-world issues such as deforestation, eutrophication, and climate change impacts on ecosystems. It also develops your ability to evaluate ecosystem services, conservation strategies, and the role of feedback loops. By the end, you should be able to explain how energy and matter move through ecosystems and why this matters for planetary health.
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