00267nam a2200109 a 450000500170000008200130001710000160003024500260004626000510007230000170012370000170014020251203091603.0  a577bPUT  aPutman, RJ.  aPrinciples of ecology  aBerkeleybUniversity of California Pressc1984  a388p, 22 cm.  aWratten, SD.