The concept of outdoor recreation ; Mechanical forces exerted by various recreation activities and the concept of protection ; Major changes in vegetation as a result of wear ; Changes in communities and plant species as a result of wear ; Plant populations and mechanical wear ; The physiological reactions of plants to damage ; Introduction to soils ; Litter and organic material ; Soil erosion ; A classification of disturbance to animals ; The impacts of water-based recreation ; Fishing and water quality ; Protective shark nets
