Subject Index 



373 



lice, 322 



litter-size, SOS, 317 

 population fluctuations, 304 

 productive cycle, 319 

 responses to increased population den- 

 sity, 281 

 Migrations 



lemming, 86 

 Milk let-down reflect, 2r)S 

 Monkey (see also Rhesus monkey), 194 



brucellosis, 256 



colobus, 196 



corticoids, 268 



malaria, 256 

 Moose, 122 

 Mortality 



alterations, 94 



effect of crowding on, 279 



immediate cause, 323 



increase, 323 



in dense populations, 319 



mass, 322 



of young 

 factors, 321 



prenatal, 315 

 Motor activity, 16 

 Mt. Desert Island, 33, 53 

 Mouse (see also mice), 196, 170, 175 



adrenalectomized laboratory, 201 



adrenal gland, 196 



adrenal weight, 197 



albino, 280 



copulation pressure, 289 



crowding mortality, 280 



development of, 196 



dominant, 264 



fertility, 288 



fights, 296 



male fertilit\-, 289 



Xoninovolution of X-zone, 258 



puberty, 197 

 Mouse (see also Clethrionomys) 



red-backed, 27, 52, 54 



subordinate, 264 



tundra, 318 



velocity in a hierarchy, 149 

 Mule deer, 122 



does, 24 



fawns, 24 



males, 24 



Mus (see also mice and mouse) 



inhibition of growth and reproduction, 

 316 

 Muskrat (see also Ondatra), 323 

 endocrines, 305 



relationships between population den- 

 sity and reproduction, 310 

 reproduction, 317 

 reproductive organs, 305 

 Mus musculus {see also mice and mouse), 

 196, 217 

 medullar}^ hypertrophj^ 227 

 responses to increased population den- 

 sity, 281 

 Myotis, 193 

 Myotis grisecens, 122 

 Myotis lucifugus, 122 

 Myotis yiunanensis, 122 

 Myotis velifer, 122 



Natural populations, 323 

 Natural selection, 122 

 Neighbors 



contacting, 45, 46 



distance between, 50 



number of, 51 



perception of, 51 



signal field, 47 



sign field, 47 

 Nerves 



postganglionic sympathetic, 22:] 



splanchnic sympathetic, 223 

 Nervous system 



sympathetic, 223 

 Neurohypophysis, 214, 241 

 Neutrophil 



count, 252 

 New York, 33, 54 

 New Zealand, 322 

 Niche 



characterization, 77 



l)rimary component of, 77 



specializations, 74 

 NIH Emotional Activit.y Alley, 17 

 Norepinephrine, 209 



effects, 223, 224 



secretion, 226, 227 



source, 225 

 North American Census of Small Mam- 

 mals, 26 



