00264nam a2200109 a 450000500170000008200190001710000230003624500330005925000120009226000330010430000170013720251203090505.0  a574.5,bD, kre  aKrebs, Charles, J.  aEcology: the experimental...  a3rd ed.  aNew YorkbHarper & Rowc1985  a800p, 24 cm.