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These terms define your current search. Click the × to remove a term. Natural Resources, Earth and Environmental Sciences: natural resources > biological resources > keystone species × 74 items, grouped by Government, Law and Regulations (view ungrouped items) government and administration (2)    (Click to View) The European spruce bark beetle Ips typographus in a national park: from pest to keystone species Biodiversity and conservation (Click to View) Biologically relevant scales in large mammal management policies Biological conservation