INDEX 



Page numbers in bold-faced type refer to pages on which terms are defined or 



the concept illustrated. 



Abert squirrel, 126 

 Abra, 181, 340, 341, 348 

 Abronia maritima, 60 

 Absorption, 92 

 Acacia, 283 

 Acids, 89, 90 

 Acipenser fulvescens, 306 

 Acmaea, cassis, 325, 328 



digitalis, 325 



digitalis umbonata, 328 

 Acorn barnacles, 313 

 Acorns, 129 



Acridium acadicum, 267 

 Acrolophitus hirtipes, 265 

 Activity, 55 

 Adaptation, 54, 55 



structural, 32 

 Adelphochorus rapidus, 275 

 Adenostoma, 288 

 Adrenalin, 217 

 Adults, 318 



Aequorea forskalea, 315 

 Aesculus californica, 143 

 Agave, 283 



Ageneotettix doorum, 265 

 Aggregation, 145-149, 57-59, 66 



animal, 58, 59 



as a process, 146-149 



causes, 146, 147 



consequences, 149 



general relations, 145, 146 



instinct, 206 



kinds, 148, 149 



on land, 147, 148 



permanent, 59 



plant, 57, 58 

 Agoseris, 292 

 Agropyrum. 243, 272, 279, 290, 292 



pauciflonim. 291, 292 



smithi, 256, 262, 270, 278, 290-292 



Agropyrum, smithi dasystachyum, 

 291 



spicatum, 244, 291, 292 



spicatum inerme, 291, 292 

 Air, 62, 89 



reaction, 89, 91 

 Alaska shrimp, 339 

 Alegocephalus coeruleus, 308 

 Algae, 89, 300, 331 



blue-green, 75, 300 



coralline, 313 



microscopic, 91 



yellow-green, 75 

 Algal s.ymbiont, 140 

 Allium, 287 

 Allobiocenose, 7 

 Alnus, 139 



Alternating generations, 34 

 Amblycorypha hamsteca, 280 

 Ambrosia beetles, 155 

 Ambush bug, 275 

 Ambystoma, 46 

 Ameiurus melas, 300 

 Ammodramus (grasshopper sparrow), 



257 

 Ammophila, 148 



Ammospermophilus harrisii, 285 

 Amnicola, 306 

 Amoeba, 140 

 Amorpha canescens, 272 

 Amphibians, 62, 82 

 Amphictcis, 339 

 Amphilepsis-Pecten biome, 344, 345, 



349 

 Amphiodia urtica, 339 

 Amphipods, 333 

 Amphissa, 326 

 Amphitornus coloradus, 265 

 Amphiura, 341 



filiformis, 341 



395 



