Index 



379 



Diprion polytommn, 155 

 Direct competition, 213, 225, 229 

 Discus cronkhitei, 133 

 Dispersal, 125, 290 



of climax species, 314 



of marine forms, 307 



of subclimax species, 314 

 Dispersal availability, 309 

 Dispersal opportunities, 307 

 Dispersal patterns, 302 

 Dissosteira longipemiis, 125, 130 

 Disulphide bridge, 31 

 DNA, 38, 69, 71, 79 

 Dodo, 239 

 DoJerus, 314 

 Dominance, genetic, 66 

 Dominants, changeless, 261 



community, 251 



ecological, 231 



ranges of, 251 

 Dosage, genetic, 66, 74 

 Double colonization, 167 

 Drosophila, 64 



americana americana, 192 



americana texana, 192 



competition, 213 



hybrids in, 195 



laboratory mutants, 87, 102 



melanogasier, 66 



novamexicana, 192 



persimilis, 11, 119 



pseudoohscura, 11, 119, 136, 138 



virilis complex, 191 



willistoni, 119 

 Drought, 273 



E 



Earth, 15 



age of, 19 



dimensions of, 7 



dynamics of crust, 327 



evolution of, 17 

 East Pacific Rise, 24 

 Eastern deciduous forest, 247, 280 

 Echeneid fishes, 236 



Echidna, 309 



Ecnomus, 93 



Ecological barriers, 308 



Ecological characteristics of species, 



119 

 Ecological isolation, 181, 207 

 Ecological oscillations, 214 

 Ecological tolerance, 122 



extension of, 240 

 Ecotones, 255 

 Edaphic factors, 255 

 Edwards, Milne, 2 

 Electromagnetic energy, 43 

 Electron excitation, 43 

 Electronic conversion, 43 

 Elements, evolution of, 13 

 Elevating process, 328 

 Elipsocus, 224 

 Empidonax, 181 

 Empoasca, 239 

 Encarsia formosa, 228 

 Enchytraeus fragment osus, 155 

 Endelomyia, 156 

 Environment, 44 



and mutation, 80 

 Environmental factors, selection by, 



101 

 Enzymes, 34, 36 



action of, 37 

 Eocene, 57, 141, 265 

 Equatorial plane, 31 

 Equisetiim, 155, 202 

 Equus, 65, 66, 98 

 Erosion, 333 

 Erythroneura, 228, 242, 247 



competition in, 225 



hybrid species, 83 



species flocks, 187 

 Euchromatin, 63 

 Eupatorium adenophorum, 290 

 Euphorbiaceae, cactus-like, 286, 320, 



323 

 Evolution, 



of communities, 209 



of community relationships, 212 



