Ecosystem service use in South Africa
Mapping ecosystem services has become common practice but mapping the complex interactions between humans and nature still remains a challenge. However, it is crucial to understand human well-being, resource use and development.
In an article recently published in Global Environmental Change, Centre PhD student Maike Hamann together with colleagues Oonsie Biggs and Belinda Reyers, have looked at how certain ecosystem services are used by households in different parts of South Africa. This way they can identify distinct social-ecological systems.
They found that households in areas of high direct ecosystem service use are characterised by lower average household income and population density, often headed by females or located in communal areas. High levels of direct use tend to occur in the eastern parts of the country with a more mixed pattern visible in the rest of South Africa.
Increasing income, decreasing use of local resources
The study shows that as household income increases, use of locally available natural resources decreases. Such a pattern of declining dependence on locally available natural resources is well-known, but has never been documented on a national scale in South Africa.
Hamann and her colleagues used national census data to evaluate the direct use of six ecosystem services: animal production such as livestock and poultry, crop production, use of freshwater from a natural source, use of firewood for cooking, use of firewood for heating and use of natural building materials.
Based on the level of use, they were able to identify three different system types: A ‘green-loop’ system with a high level of direct use and a ‘red-loop’ system representing the very opposite. In between these two was the ‘transition’ system.
"This pattern not only shows how the average use of ecosystem services among households differs, it shows how people relate to the environment in totally different ways"
Maike Hamann, lead author
Create policies to reconnect
Further examination of the green and the red loop systems reveals several distinct characteristics. Households within the green loop are typically in communities with limited access to market economies but with strong ties to nature.
As communities become richer and more urban, they tend to disconnect from the local environment they depend on and cover their needs by buying the ecosystem services or even substitutes such as electricity instead of firewood to cook.
However, while the direct use of locally sourced ecosystem services in red-loop communities may be low, the total use may be high. This is because resources are largely extracted from areas distant from where they are consumed.
Maike Hamann believes this knowledge is essential in tailoring policies to manage particular resource use.
By identifying the location of red-loop and green-loop systems in South Africa, Hamann and her colleagues believe that policies can be better targeted and address particular challenges in particular areas.
"Different challenges demand different policy interventions. In green-loop areas the primary focus might be supporting growth and access to markets to reduce vulnerability of the most marginalised, while in red-loop areas policies could focus on reconnecting people to their local environment," says Hamann.
Distribution of social-ecological systems in South Africa, characterised by high, medium and low direct ecosystem service use.
Hamann, M., Biggs, R., Reyers, B. 2015. Mapping social-ecological systems: Identifying ‘green-loop’ and ‘red-loop’ dynamics based on characteristic bundles of ecosystem service use. Global Environmental Change 34: 218-226. doi:10.1016/j.gloenvcha.2015.07.008
Maike Hamann is a PhD student. She is exploring the links between ecosystem services and human well-being in the Eastern Cape Province of South Africa. Her work is part of a programme on the 'Governance of ecosystem services under scenarios of change in southern and eastern Africa', led by the Stockholm Resilience Centre and funded by the Swedish International Development Agency (SIDA).
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