The Biology of Population Growth

acres ACTH adaptation adrenal adult androgens apparently area G average behavior biotic birds breeding season caged cause cells changes characteristics chemical compensatory corpus luteum cottontail rabbits cycle cyclic death deer density-dependent disease dispersal dominant ecologists Ecology effects eggs emigrated endocrine environment environmental estrogen estrous cycle estrus factors females fertility food supply function gene genetic glands gonadotropin gonads grouse habitat home range hormone house mice hypothalamus implantation increased individuals inhibition insects intrinsic involved litter mammals mechanisms months movements natural populations nest number of animals offspring organisms ovaries ovulation parasites Pennsylvania Pennsylvania Game Commission percent period Philadelphia Zoo physiological pituitary plants population curve population density population dynamics population growth population pressures pregnancy prey produced prolactin rats regulate population release reproductive rate responses result salmon secretion selection sex ratio sexual maturity social interaction species stimuli stress study area survival Table trapped voles white-tailed deer wild woodchucks young woodchucks