INDEX 



403 



Coccinellids, 131 

 Coccobacillus acridiorum, 184 

 Cockle, 333 

 Cockroaches, 285 

 Cod, 199, 201, 336 

 Codfish, 180, 181, 199 

 Codling moth, 183 

 Codominant, 238 

 Cod plaice, 340 

 Coclentcratcs, 54, 99 

 Colaptes, 129 



chrysoides, 110 

 Coleoptera, 130 

 Colicops, 275 

 Colinus virginianus, 154 

 Collembola, 275 

 Colloidal sulphur, 101, 297, 314 

 Colony, 154, 246 

 Columbine, 220 

 Common mole, 134 



Community, 2, 147, 234, 254, 322, 323, 

 332, 334, 338, 346 

 Abra, 340 

 bottom, 304 



comparison, land and sea, 247, 248 

 marine and terrestrial, 352-353 

 deeper water, 338 

 development, 353 

 fresh-water, 294-312 



climax, 298 

 functions, 20, 55-67 

 aggregation, 57 

 among animals, 58, 59 

 among plants, 57, 58 

 ecesis, in animals, 65 

 in plants, 63-65 

 interrelations, 66, 67 

 related processes, 66 

 migration, 59 

 in plants, 60, 61 

 of animals, 61 

 types, 61-63 

 nature and significance, 55-57 

 general, 2 



influence on habitat. 08-102 

 definition and natiu'e, 68, 69 

 digging and burrowing, 80-84 

 kinds, 70 



reaction, acids and toxins, 89, 90 

 accumulating shells, 75 



Community, influence on habitat, re- 

 action, adding organic matter, 

 78, 79 

 air content, 89 



bottom in deep water, 101, 102 

 cementing particles, 86 

 climate, 93 

 COo and O2, 92 

 decreasing plant nutrients, 88, 



89 

 decreasing water content, 88 

 disturbing soil, 79 

 humidity, temperature, and wind, 



92 

 increasing water content, 87, 88 

 in fresh water, 94-98 

 in sea, 99-102 

 in sluggish water, 98 

 in swift water, 98 

 in water, 94-102 

 medium, 97 

 on land, 71-91 

 produced by man, 93, 94 

 returning plant nutrients, 88 

 role, 70 



slipping and sliding, 77, 78 

 soil, 72 



water-borne detritus, 76, 77 

 weathering, 75, 76 

 wind-borne material, 75 

 relation to life forms, 69, 70 

 soil formation, 72-75 

 soil structure, 78 

 surface disturbances, 84-86 

 North Atlantic, 18, 19, 340-352 

 North Pacific, 118. 339 

 Pandora-Yoldia, 315 

 pelagic, 29, 314-322 

 sea bottom, 15-19, 322, 353 

 sea-urchin gastropod, 330 

 sea-urchin-triton snail, 315 

 serai, 56 

 swift-water, 310 

 tidal, 313, 325, 331-335 

 tree-top hiemal layer, 246 

 Venus, 15, 340 

 Competition, 150, 145, 159-167 

 animal, 166. 167. 1S5-1S7 



nature and kinds. 166, 167 

 biotic balance, 172-175 



