378 



Subject Index 



Social system, 3, 4 



semiclosed, 100 

 Social withdrawal, 145 

 Society 



human, 184 



rat, 161 

 Sodium: potassium ratio 



serum, 204 

 Sodium retention, 201 

 Sorex, {see also shrew), 27, 29, 31, 32, 36, 



' - 38, 52, 61, 68, 69, 70, 72, 75, 77, 78 

 /Sorex araneus, 196, 197 

 Sorex cinereus, 193, 246 

 Sorex dispar, 193, 246 

 Sorex fumeus, 193, 246 

 (Sorex palustris, 193, 246 

 Soricidae {see also shrew, Sorex, and 

 Blarina) 



adrenal, 246 

 Space 



general theorj- of use, 34 



interspecific and intraspecific use, 34 



social use, 2 



theoretical conceptualization of use, 70 

 Spatial equilibrium, 57 

 Species, 3 



alpha, 36, 37 



l)eta, 36, 37 



distance between neighbors, 42 



dominant, 36, 52, 67, 68, 78 



incipient, 74 



rf^lationship between two dominant, 52 



removal captures, 55 



socially dominant, 55, 57 



subordinate, 36, 38, 52, 61, 67, 68, 78 



survival, 122 

 Spermatogenesis, 



decrease, 258 

 Spleen 



house mice, 251 



h^'pertrophy, 251 



Microtus agrestis, 251 



volves, 251 



weights, 249, 251 

 Splenic hypertrophy, 271 

 Standard area, 5 

 State 



nonresponsive P, 140 

 Stations 



feeding, 95 



Status 



subordinate, 68 

 Steady state 



evolutionary, 108 

 Steroid hormones, 218 

 Steroids, 248 



sex, 258 



site of action, 216 



urinary, 249 

 Stimuli 



alarming, 212, 215 

 Stimuli 



auditor}^ 70 



emotional, 243 



conditioned, 75 

 Strange object reaction, 89 

 Strange-object response, 179 

 Stress, 88, 193, 196, 213, 235 



generalized state, 182 



resulting from group size change, 118 

 Stressful state 



amount of time spent, 112 

 Stressors 



nonspecific, 119 

 Stretch receptors 



secretion of aldosterone, 204 

 Strife 



intraspecific, 262 

 Sudanophilia, 248 

 Supraopticohypophyseal tract, 214 

 Survival 



threshold of, 132 

 Sylvilag^is {see also rabbit), 193 

 SjTnpathetic nervous system 



ganglia, 198 

 System 



Iwpothesized communication, 58 



two-species, 36 



Tachyglossus, 195 

 Target diameter 



determined by variabihty of l^diavioral 

 traits, 140 



genotype, 140 



hj'pothesized divergence, 132 



of individual, 110 



variability, 127 

 Territory, 263 



of male mice, 287 



