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  "Title": "Sustaining Oaks in the Chicago Wilderness Region",
  "Author": "M. Johnston (Field Museum)",
  "Comments": "Oak trees were mapped by map analysts from Morton Arboretum, Lake County, and other Chicago Wilderness participating counties by digitizing oak trees visible in 1939 and 2010 aerial imagery. Overlaid on these data are protected lands (developed by the Field Museum) and the Chicago Wilderness Green Infrastructure Vision 2.2 \"Ecological Network\" (Hub 1).\n\nOak trees once dominated the forests and savannas of the Chicago region. They were keystone species, the foundation of entire ecosystems. Now, oak species are in decline in the region, both in developed urban sites and in natural areas. Oaks that have been lost are not being replaced; oaks are not regenerating in ecosystems drastically changed by development and competition from more shade-tolerant species. When the grand old oaks that survive today reach the end of their lifespans, we may be left with far fewer oaks.",
  "Subject": "Oak (Quercus spp.) populations in 1939 and 2010 based on aerial imagery in the Chicago Region with protected lands and the CW GIV as overlays.",
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  "Keywords": "Chicago Region,Oaks,Quercus,oak recovery"
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