?url_ver=Z39.88-2004&rft_id=10.1086%2F690908&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Wickman%2C+J.&rft.aulast=Wickman&rft.aufirst=J.&rft.issue=4&rft.volume=189&rft.date=April+2017&rft.issn=0003-0147&rft.atitle=Determining+selection+across+heterogeneous+landscapes%3A+a+perturbation-based+method+and+its+application+to+modeling+evolution+in+space&rft.title=American+Naturalist&rft.pages=381-395&rft.genre=article