| snippet:
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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. |
| summary:
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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. |
| extent:
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[[-89.6880850842275,40.3981093535674],[-85.6511981051581,43.1982210031327]] |
| accessInformation:
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Chicago Wilderness, and Morton Arboretum |
| thumbnail:
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thumbnail/thumbnail.png |
| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"] |
| description:
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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).
Oak 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. |
| licenseInfo:
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| catalogPath:
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| title:
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Sustaining Oaks in the Chicago Wilderness Region |
| type:
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Map Service |
| url:
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| tags:
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["Chicago Region","Oaks","Quercus","oak recovery"] |
| culture:
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en-US |
| name:
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Oak_Ecosystems_1939_to_2010 |
| guid:
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C15AE5B7-F91B-43ED-A549-9262F40FFA70 |
| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere |