00286nam a2200109 a 450000500170000008200160001710000180003324500140005126000380006530000230010350000500012620251203090700.0  a577.16bPIM  aPimm, Stuar L  aFood webs  aNew DelhibChapman and Hallc1982  axi,219pc22cm.bPB  aincludes bibliographical references and index