Nile, Biology of an Ancient River

357 Temperature . . . . . . . . . 360 Salinity and conductivity 363 Major ions . . . . . . . . . Lake Victoria . Lake Kioga . . Lake Tana . . 390 The Sudan plain . 395 Limiting factors . . . . . . . . 396 Rates of photosynthetic production 397 References . . . . Epilogue by ]. Rzoska 403 Authors Index . 407 Subject Index .