366 



Subject Index 



Clethrionomys — continued 



relationship between population densitj' 



and reproduction, 310 

 reproductive function, 314 

 Clethrionomys glareolus, 196 

 Clethrionomys rujocanus, 311 

 population density, 308, 313 

 territory, 300 



inhibition of reproductive fun(^tion, 318 

 Close confinement 



effects of, 271 

 Codominants, 67 

 Cold 



adaptation, 228 

 exposure, 234 

 Colobus polyl'omos, 196 

 Colony 



compact, 86 

 evolution of, 88 

 Howler monkeys, 90, 92 

 Norway rat, 92 

 formation, 87 

 stability, 89 

 Communication, 38, 125 



low frequency, 59 

 Communication 

 reduction, 67 

 vocal, 70 

 Communication constant, 133 

 Communication function (/*), 126 

 Community, 2, 8, 32, 35, 49, 55, 74, 78 

 Blarina: Peromyscus, 73 

 one-species, 73 

 psychological apex, 79 

 small-mammal, 75 

 Sorex: Clethrionomys, 73 

 subordinate member, 78 

 Competition, 78 

 food and social, 271 

 social, 262 

 "Competitive exclusion," 77 

 Configuration 



active rejection of new, 179 

 physical nonsocial, 183 

 seeking of new, 178 

 Conformity, 162 

 Constellation, 85 

 adjoining, 60 



derivation of compact colonies from, 86 

 expected viability in, 61 

 formation, 57 



individuals forming, 63 

 loosely knit, 88 



number of individuals forming, (il 

 periphery, 60 

 theoretical, 62 

 Contact 



between individuals, 105 

 decrease of responsive-responsive, 107 

 encounters, 106 

 frequency, 38, 106, 139 

 frequency of responsive-responsive, 106 

 individual, 106 

 refractory, frequency of, 105 

 responsive-refractory, 103 

 responsive-responsive, 103 

 social perception, 136 

 variables determining, 101 

 Copulation pressure 



criticized, 293 

 Cortex {see also adrenal cortex), 72 

 adrenocorticotropin, 197 

 cellular hj^perplasia, 213 

 fasciculata, 198 

 h^-pertrophy, 213 

 Cortical glomerulosa, 216 

 Cortical hormones 



relationships, 212 

 Cortical hyperplasia 



cortical, 218 

 Cortical mass 



increase, 135 

 Cortical stroma 

 carnivores, 194 

 rodents, 194 

 Corticoids 



carbohydrate-active, 220, 245 

 secretion, 222 

 Corticosteroids 



release, 213 

 Corticosterone, 205, 206 

 mice, 208 

 rats, 208 

 Corticotropin peptides, 200 

 Corticotropin-releasing factor, 214 

 Cortisone, 196, 197, 205, 232 



tetratogenic effects in mice, 210 

 Cotton rat, {see also Sigmodon), 323 

 Cow, 196 

 Creativity, 162 

 Crocidura, 196 



