When visiting the volcanic islands of SĂŁo TomĂ© and PrĂncipe off the coast of West Africa, one is immediately struck by how unusual these tropical islands are. The steep, volcanic mountains seem to be swathed in impenetrable, story-book jungle. But, as ecologists know, first impressions can be deceiving.
When SĂŁo TomĂ© and PrĂncipe were discovered by Portuguese navigators in 1470 the land was entirely covered by forest. In more than five centuries of human occupation, most this native forest has disappeared. Indeed, most of the green one sees from the air today comes from shade plantations and degraded forests.
A biodiversity hotspot
The islands have been called the â€śAfrican GalĂˇpagosâ€ť, in reference to the Pacific island archipelago famous for its high level of endemism. But, though they are nowhere near as famous as their South American counterpart, they win hands-down when it comes to unique biodiversity: SĂŁo TomĂ© and PrĂncipe are home to more endemic species in an area that is eight times smaller than the GalĂˇpagos.
This is perhaps no surprise, as tropical forests are biodiversity hotspots that hold far more species than any other terrestrial biome. They also provide key ecosystem services like food, timber and climate regulation.
But forests are being lost at an alarming rate. Between 1990 and 2015, 129 million hectares of forests were lost in the world – an area similar to that of South Africa. Sub-Saharan Africa itself registered some of the highest deforestation rates: up to 14% in the south and east, and 10% in central and west Africa.
The situation in SĂŁo TomĂ© and PrĂncipe
The last national forest survey for SĂŁo TomĂ© and PrĂncipe was conducted in 1999. According to those estimates, 10% of the country comprised non-forest land-use, and 61% was covered by forests and 29% by shade plantations. The shade plantations constitute agro-forestry systems that produce coffee and cocoa, the countryâ€™s key export crops.
The numbers might suggest that there is little cause for concern, but they do not account for more recent trends of forest loss. They also donâ€™t account for whether forests are native or not. In addition to the shade plantations, much of the islands are covered by â€śdegradedâ€ť forested ecosystems like secondary forests. These are dominated by introduced and invasive species like the breadfruit, the African nutmeg and the oil palm. Native forests are largely restricted to some remote valleys and inaccessible mountain areas.
The islandsâ€™ fast-growing economy and human population have had a significant effect on the native forests. The islandsâ€™ populations have increased by more than one-third since the turn of the century. As land has become scarce, people have turned to the forest to sustain their livelihoods. At the same time, the government has licensed large areas of forest to commercial interests. In the past seven years, it has handed 5% of the country to oil palm production and 5% to commercial cocoa producers.
Differences in conservation practices
On paper, SĂŁo TomĂ© and PrĂncipe are well provided for in terms of conservation. Both islands have protected areas: the ObĂ´ Natural Park in SĂŁo TomĂ© and Natural Park in PrĂncipe. Each covers nearly one-third of the islandsâ€™ areas.
Despite there being similar legal protection for their natural forests, the reality of conservation is very different on the islands.
PrĂncipe has a period of three months during which it is forbidden to cut trees. Most available timber is imported from certified producers and it is unlikely to find illegally felled trees. In contrast, illegal logging is rife on the larger and more populous SĂŁo TomĂ©.
One explanation for the difference between the islands is that the United Nations Educations Scientific and Cultural Organisation classified PrĂncipe as a biosphere reserve in July 2012. The regional government now promotes the island as an example of sustainable development in action.
Forest loss and degradation are leading to a scarcity of forest resources. In addition to loss of habitat through deforestation, native species are faced with degraded forest systems that offer poor habitats. This poses a measurable threat to biodiversity.
The well-being of future generations is also at stake.
The people of SĂŁo TomĂ© and PrĂncipe rely heavily on forest resources. Nearly all houses are made out of wood. Giant land snails caught in the forest are an important source of protein, as are fish from inshore fisheries that are caught in dugout canoes. Both are usually cooked over charcoal or firewood obtained from the forest.
These resources have become difficult to access, and there is insufficient timber supply to meet the islandsâ€™ growing needs. The timber that is available is of a low quality, lasting for only about five years, and is unsuitable for construction.
Authorities are not indifferent to the situation. The timber shortage has become so bad that government is planning to import timber from Equatorial Guinea. The hope is that a cheaper supply will provide a temporary market solution for the current crisis, and allow Santomean timber stocks to recover.
But much of the timber sector operates outside the law. The Forestry Directorate is short of money, vehicles and manpower. It cannot begin to address the complaints of illegal activities it receives. Moreover, when the authorities do try to act, they are frequently met with hostility on the ground, with people routinely blocking roads to hinder law enforcement.
The situation in Sao Tome and Principe mirrors worrying global trends in forest degradation and loss. Finding solutions is imperative, and hopefully some of the experiences from this small island nation will provide useful lessons for other parts of the world.
Martin Dallimer, Lecturer in environmental change, University of Leeds and Ricardo Faustino de Lima, Postdoctoral researcher, Centre for Ecology, Evolution and Environmental Changes, Universidade de Lisboa