Abstract
This paper examines issues surrounding littering in protected areas (PAs), one of the most ubiquitous and conspicuous impacts of tourism activity. In addition to obvious visual, landscape-affecting impacts, litter may have hazardous consequences for biodiversity and humans. In order to precisely assess littering in a densely populated region with high levels of visitation to natural and protected areas, we counted, measured and classified all types of non-organic litter covering an area of 1 cm2 or more found on the ground in zones intensively used by visitors (picnic areas and paths) within the 10 PAs of the Autonomous Region of Madrid. On average, 11.65 m2/ha of litter were recorded in those zones. Strict visitor management measures greatly reduced that figure. Over 75% of all litter was paper and cardboard, and plastic; 88% of litter coverage was by large pieces over 25 cm2 in size. We tested the hypothesis that the amount of waste found on paths is correlated with the distance to the entrance to a PA, but no general model fitted actual litter distribution patterns, although empirical results backed the hypothesis for most cases. A range of waste management strategies are explored and litter management measures suggested for problematic PAs.
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