Further pressures include disturbances from fishery and by-catch of birds and otters, oil extraction and transportation (with the danger of regular and accidental spills), solid waste disposals, invasive exotic species of plants and fishes, high numbers of wild boars, reed-burning, unsustainable collection of medical plants, landslides, and more frequent occurrence of drought periods. Diminishing rural populations is a problem, because traditional practices have become part of the functioning of the ecosystem, and lively rural areas have an important tourism potential. This initiative was triggered by and receives support from WWF.