Protected area, easement, and rental contract data reveal five communities of land protection in the United States

Earth & Environmental Sciences

• easement 100%
• contract 66%
• protected area 60%
• land 38%
• county 13%
• organization 7%
• fee 5%
• soil quality 5%
• ownership 5%
• human population 4%
• population size 4%
• mosaic 4%
• cluster analysis 4%
• water management 4%
• wildlife 4%
• biodiversity 3%
• productivity 3%
• services 3%
• fish 2%
• soil 2%
• method 1%

Medicine & Life Sciences

• Contracts 79%
• Soil 16%
• Organizations 12%
• Endangered Species 11%
• Biodiversity 10%
• Fees and Charges 9%
• Ownership 9%
• Population Density 8%
• Fishes 6%
• Cluster Analysis 6%
• Research Personnel 5%
• Water 5%

Agriculture & Biology

• conservation areas 65%
• U.S. Fish and Wildlife Service 7%
• soil productivity 6%
• ownership 5%
• biodiversity conservation 5%
• water management 5%
• threatened species 5%
• human population 5%
• soil quality 4%
• population size 4%
• cluster analysis 4%
• researchers 4%
• methodology 1%