Thesis (PhD (Botany and Zoology))—University of Stellenbosch, 2009. / Natural ecosystems provide many services that are crucial for sustainability and health of
human society. Ecosystem services are the benefits people obtain from ecosystems (i.e. goods
and services) and can be classified into provisioning (e.g. fibre, fuel wood); regulating (e.g.
water and climate regulation); supporting (e.g. soil retention) and cultural (e.g. aesthetic
value). The growing global human population and other threats place enormous stress on the
natural environment reducing its capability to provide services. According to the Millennium
Ecosystem Assessment, more than 60% of ecosystem services worldwide are being degraded
or used unsustainably. The need to safeguard ecosystem services is therefore urgent.
Biodiversity underpins most ecosystem services, but the functional relationship between
biodiversity and services is not well known. A wide range of strategies exist for safeguarding
biodiversity, but no such approaches have been developed for ecosystem services. A key
conservation strategy is the use of systematic conservation planning to identify priority areas
where effort should be focused. There are calls for the inclusion of ecosystem services into
conservation planning geared towards biodiversity. Ecosystem services have been used for
many years as an additional rationale to justify biodiversity conservation and it is often
assumed that conserving biodiversity will also conserve services. However, it is unclear how
different facets of biodiversity relate to different services and to what extent conserving
biodiversity will safeguard services.
This thesis addresses a range of issues relating to the integration of ecosystem services into
conservation planning in South Africa. I first investigated the status of ecosystem services in
conservation planning worldwide by reviewing the conservation planning literature from 1998
to 2005. Ecosystem services are clearly not adequately addressed in conservation
assessments. A critical barrier preventing the inclusion of ecosystem services in conservation
plans is the lack of spatially-explicit data. I developed a methodology for mapping ecosystem
services in South Africa and mapped the distribution of five important ecosystem services
(surface water supply, water flow regulation, carbon storage, soil retention and accumulation).
Using the five services to examine relationships within services and between biodiversity
revealed a lack of congruence between services and different levels of congruence with biodiversity features. However, including ecosystem services in a biodiversity assessment
captured at least thirty percent of each of three services selected for the study. Nevertheless, a
biodiversity plan may not necessarily capture adequate amounts of ecosystem services.
Ecosystem services should be planned for explicitly instead of relying on biodiversity data. I
identified priorities that met targets for five services in the grasslands of South Africa. This
thesis provides new insights on planning for biodiversity and ecosystem services. The results
have immediate applicability for conservation planning in South Africa.
Keywords: Conservation planning, conservation assessments, ecosystem functions, ecosystem
processes, ecosystem services, natural capital, biodiversity, soil, water, carbon.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1405 |
| Date | 03 1900 |
| Creators | Egoh, Benis Nchine |
| Contributors | Richardson, David M., Reyers, Belinda, Rouget, Mathieu, University of Stellenbosch. Faculty of Science. Dept. of Botany and Zoology. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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