The value and distribution of ecosystems

Ecosystems are dynamic systems where living organisms interact with each other and their physical environment. Their value can be understood in terms of goods (e.g., timber, fish) and services (e.g., pollination, water purification, climate regulation). The distribution of ecosystems is influenced by climatic factors such as temperature and precipitation, as well as soil type, altitude, and human activity. For example, tropical rainforests are concentrated near the equator due to high rainfall and temperatures, while tundra ecosystems are found at high latitudes. Understanding this distribution is crucial for managing resources and conserving biodiversity, especially in the face of climate change.

The value of ecosystems extends beyond direct economic benefits to include cultural, aesthetic, and intrinsic values. For instance, the Amazon rainforest provides global climate regulation through carbon storage, while also supporting indigenous cultures. In the UK, moorlands like the Peak District offer recreational value and water catchment services. However, these ecosystems are often undervalued in economic terms, leading to their degradation. The concept of ecosystem services (provisioning, regulating, supporting, and cultural) helps quantify their importance, but challenges remain in assigning monetary values. This topic is central to WJEC A-Level Geography as it links physical geography (biomes, climate) with human geography (resource management, sustainability).

The distribution of ecosystems is not static; it shifts due to natural processes and human activities. For example, deforestation in the Amazon reduces the extent of rainforest, while climate change is causing poleward shifts of biomes. In the UK, peatlands have been drained for agriculture, altering their distribution and reducing their carbon storage capacity. Students should be able to describe and explain global patterns of biomes, using climate graphs and maps, and evaluate the factors that cause change. This knowledge is applied in case studies, such as the management of the Serengeti ecosystem or the restoration of UK heathlands, which are common exam topics.