News Release 

Satellite images reveal land productivity changes in protected areas worldwide

New analysis provides baseline for analyzing the success of protected areas in conserving ecosystems

PLOS

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IMAGE: Land degradation at the edge of the Bwindi Impenetrable Forest National Park, Uganda view more 

Credit: Grégoire Dubois

Satellite observations suggest that protected areas may help conserve stable levels of land productivity. However, productivity has dropped or risen in nearly half of the total land under protection worldwide, pointing to potentially detrimental factors. Begoña de la Fuente of Universidad Politécnica de Madrid, Spain, and colleagues from the Joint Research Centre of the European Commission, Italy, present these findings in the open-access journal PLOS ONE on August 5, 2020.

Land productivity refers to changes in the amount of observed above-ground biomass, typically plant cover (a concept related to agricultural production). A reduction or increase in land productivity can be an indicator of harm to an ecosystem, making it an important metric in monitoring the success of conservation efforts.

For this study, De la Fuente and colleagues used satellite images to analyze land productivity in protected areas established to promote conservation--such as national parks or areas that permit sustainable use of natural resources. The analysis captured all protected areas of at least 10 square kilometers worldwide, as well as 10-kilometer buffer zones around each protected area, from 1999 to 2013.

The researchers found that, over the 15-year study period, stable levels of land productivity were maintained in 44 percent of the protected land areas and in 42 percent of the unprotected buffer areas. While increases in productivity were more prevalent in unprotected buffers, almost half of the protected land underwent increases or decreases in productivity. Different types of protected areas showed different trends in land productivity. Geographic location was also a factor; for example, Oceania was the continent with the highest percentage of protected land with stable productivity (57 percent), while Europe had the lowest (38 percent).

The authors report that these findings are a first step towards deeper understanding of the success of establishing protected areas. In some cases, decreases or increases in productivity could indicate detrimental factors, such as climate change or intensive agriculture that could result in land degradation. Future research could disentangle these processes and their effects in different parts of the world.

Corresponding author Grégoire Dubois adds: "Globally, almost half of the land under protection has experienced changes in productivity over the last 15 years.

Protected areas with sustainable use of natural resources show higher percentage of land with stable productivity."

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Press-only preview: https://plos.io/3jTr2r6

Contact: Grégoire Dubois, gregoire.dubois@ec.europa.eu, Ph.: +39 (0)332 786360

Image Caption: Land degradation at the edge of the Bwindi Impenetrable Forest National Park, Uganda

Image Credit: Grégoire Dubois

Citation: de la Fuente B, Weynants M, Bertzky B, Delli G, Mandrici A, Garcia Bendito E, et al. (2020) Land productivity dynamics in and around protected areas globally from 1999 to 2013. PLoS ONE 15(8): e0224958. https://doi.org/10.1371/journal.pone.0224958

Funding: This study, the development and maintenance of the Digital Observatory for Protected Areas and the production of the land productivity map were supported mainly by the institutional activities of the Directorate D (Sustainable Resources) at the Joint Research Centre of the European Commission. We also acknowledge the contribution of the Biodiversity and Protected Areas Management (BIOPAMA) EU-ACP programme, an initiative of the African, Caribbean and Pacific (ACP) Group of States financed by the 10th and 11th European Development Funds of the European Union (EU). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interests: The authors have declared that no competing interests exist.

In your coverage please use this URL to provide access to the freely available article in PLOS ONE: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0224958

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