**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** URBAN FORESTS PROVIDE A PORTFOLIO OF CRITICAL ECOSYSTEM SERVICES AT HOUSEHOLD, NEIGHBORHOOD, CITY, AND REGIONAL SCALES. HOWEVER, THESE FORESTS DO NOT REPRESENT A RANDOM SAMPLE OF GENETIC DIVERSITY. MANY PLANTED URBAN TREES PASS THROUGH DOMESTIC SELECTION FILTERS INCLUDING BREEDING FOR DESIRABLE TRAITS, PRODUCTION BY NURSERIES, AND PURCHASE BY LAND MANAGERS. TO MAINTAIN SELECTED TRAITS, PLANTED TREES ARE TYPICALLY CLONES AND/OR CULTIVARS. WHILE CURRENTLY UNEXPLORED, THIS INFLUX OF GENETICALLY HOMOGENOUS TREES COULD DILUTE A KEY DETERMINANT OF RESILIENCE AND ADAPTATION -- THE STANDING GENETIC DIVERSITY OF POPULATIONS -- WITH POTENTIALLY DISASTROUS CONSEQUENCES FOR URBAN FORESTS AND ECOSYSTEM SERVICE PROVISION. OUR GOAL IS TO ASSESS THE INFLUENCE OF DOMESTIC SELECTION ON THE GENETIC DIVERSITY OF POPULATIONS OF TWO COMMON MAPLE SPECIES IN BALTIMORE, MD AND DETERMINE RESULTING IMPLICATIONS FOR LONG-TERM SUSTAINABILITY AND RESILIENCE OF URBAN FORESTS. TO ACCOMPLISH OUR GOAL, WE WILL: 1) PERFORM A SUPPLY CHAIN ANALYSIS TO CHARACTERIZE DOMESTIC SELECTION; 2) STUDY GENETIC DIVERSITY ALONG AN URBAN MANAGEMENT GRADIENT; AND 3) DETERMINE IN SITU ECOLOGICAL CONSEQUENCES OF DOMESTIC SELECTION ON TREE PHYSIOLOGY AND INSECT AND MYCORRHIZAL COMMUNITIES OVER TWO YEARS. OUR APPROACH ENGAGES KEY STAKEHOLDERS FROM PROJECT INITIATION ONWARD TO ENSURE DELIVERY OF RELEVANT OUTCOMES TO THE NURSERY INDUSTRY AND URBAN FORESTRY ORGANIZATIONS.