Bracken fern has become an important land transformation in the southern Yucat�n peninsular region. The fourfold increase from 1985 to 2001 is associated directly with human disturbance, primarily agricultural activities. Once established, bracken fern's persistence is supported by fire, mostly incidental burns from the large amount of swidden fires set every year to clear farm and pasture lands. Its impacts include impediment of forest succession and farmland fallow, reduction in biotic diversity, and high labor costs to combat. This chapter examines the dynamics of bracken fern invasion by linking land-use history, satellite imagery, socio-economic and ecological data through the use of spatially-explicit models. The results of regional and parcel-level models show the importance of richer household survey data and less spatially aggregated socio-ecological data in order to predict the spatial distribution of bracken fern in the region.
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