?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Sutcliffe%2C+David&rft.aulast=Sutcliffe&rft.aufirst=David&rft.volume=13&rft.date=2000&rft.issn=0961-4664&rft.atitle=Subspecies%2C+morphs+and+clines+in+the+amphipod+Gammarus+duebeni+from+fresh+and+saline+waters&rft.title=Freshwater+Forum&rft.pages=60-75&rft.genre=article