Changes in livestock footprint and tree layer coverage in Mediterranean dehesas: a six-decade study based on remote sensing

ABSTRACT

The decade of the fifties of the twentieth century triggered huge changes in land use and management in ecosystems worldwide, including the iconic Mediterranean ecosystems known as dehesas. In this study, we have quantified the changes in dehesa landscape status within a geographic area of 200,000 km² covering mainly the Spanish dehesa range over the last 60 years. We focused on changes of two important dehesa elements: tree density and live stocking rates. Tree density and tree cover change were measured via remote sensing in 29 sample plots (16 km² each) and selected from the plot-monitoring network of Spanish Rural Landscapes (SISPARES). Live stocking (cattle, sheep, and pig) rates data were obtained from the National Statistical Institute of Spain and were used to assess the entire study area. During the 1950–80s, tree density and cover declined significantly (by 18% and 13%, respectively). By the 1960s, sheep was predominant over cattle in all provinces; pigs had higher stocking rates than in the following decades. However, during the 1970–80s, sheep and pig stocking rate declined drastically (by 90% and 70%, respectively) in just 20 years. In contrast, cattle stocking rate increased progressively since the 1960s, reaching a 60% increment by the 2000s. At the municipality level, we observed similar trends. Our multi-scaled analysis explains the impact of social, political, and economic factors on the conservation status of the main dehesa territory within Spain. We conclude that it is necessary to ensure the effectiveness of these systems through sustainable activities to avoid negative consequences of poor management practices which threaten dehesa perpetuation.

Acknowledgements

Special thanks to Sergio González for his assistance to provide landscape sample plots from the SISPARES network, and for providing photographs and digital ortoimages.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was supported by the Spanish Ministry of Education, Culture and Sport to ALS under a grant Formación Profesorado Universitario. RD and SR were supported by Stanford University and Universidad Politécnica de Madrid, respectively.