AUTHOR=Pataki Diane E. TITLE=Grand challenges in urban ecology JOURNAL=Frontiers in Ecology and Evolution VOLUME=3 YEAR=2015 URL=https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2015.00057 DOI=10.3389/fevo.2015.00057 ISSN=2296-701X