Spatial patterns and determinants of avocado frontier dynamics in Mexico

Area of Science:

• Agricultural Science
• Environmental Science
• Ecology

Background:

• Global demand for commodity crops drives agricultural frontier expansion, creating pressure on production regions.
• Understanding spatial patterns and determinants of this expansion is crucial for sustainable food systems.
• Avocado production has increased significantly, necessitating analysis of its land-use impacts.

Purpose of the Study:

• To map avocado frontier dynamics in Michoacán, Mexico, before and after the North American Free Trade Agreement (NAFTA).
• To identify key environmental, accessibility, and social determinants of avocado expansion.
• To assess the socio-ecological trade-offs, including impacts on biodiversity conservation.

Main Methods:

• Utilized inventory data to map avocado frontier expansion from 1974 to 2011.
• Compiled and analyzed environmental, accessibility, and social variables.
• Employed extreme gradient boosting to identify expansion determinants and interactions.
• Predicted potential expansion patterns and assessed impacts on conservation areas.

Main Results:

• Avocado frontiers in Michoacán expanded over tenfold (12,909 ha to 152,493 ha), accelerating post-NAFTA.
• Annual precipitation, distance to settlements, and land tenure were primary drivers of expansion.
• Expansion occurred on private lands under favorable conditions and communal lands under suboptimal conditions.
• Significant overlap exists between suitable avocado expansion areas and priority conservation/restoration sites.

Conclusions:

• Avocado expansion presents a conflict between conservation goals and economic drivers, especially impacting communal lands.
• Findings offer insights for government strategies to support small-scale farmers while mitigating socio-environmental impacts.
• This study provides the first comprehensive analysis of avocado frontier dynamics in a major production region.