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The Polar Domain, Subarctic Division, Yukon Intermontane Plateaus Tayga Forest
The soil near the major river bottoms on floodplains and south-facing slopes, near streams, outer valley edges and some upland areas is thick with sediment deposits. These areas support dense forests, undergrowth, furbearers, common woodland game birds, animals and other small mammals. The short summers in this semiarid climate reaches temperatures up to 100 degrees Fahrenheit and the winters are brutal, with temperatures as low as minus 75 degrees Fahrenheit with an average annual rainfall of 17 inches.
The Humid Temperate Domain, Continental Divisions
The warm, hot, subtropical and Mediterranean divisions of the Humid Temperate Domain are further broken down into forest, oceanic, mountain and continental provinces because the ecosystems involved are vast, varied and complex. The American Pacific North coast, among others, is home to very intricate and scientifically-valuable forests. The technical understanding of ecological processes in a forest is far from perfect, but additional resources from advancing studies continuously improve efforts and data collected during research.
The Humid Tropical Domain, Savanna &Rain Forest Divisions, Mountain Provinces
Savanna and Rain Forest Divisions are set apart primarily by the amount of seasonal rainfall. Some rain forest remains on the slopes of the Puerto Rico Mountains. Forest trees include mahogany, tree ferns, mango and rosewood. The semiarid southern slopes sustain a drier forest of acacia, yucca, cacti and dry grasses. At least four types of native forests grow above the shrubland on the sheltered mountainsides of Hawaii, and extend to sea level on the more sides.
The Dry Domain, Mountain Provinces
The mountain provinces are the only forested areas in the dry domain ecosystem and consist largely of coniferous forest and alpine meadows. The mountain provinces of the Steppe Division are divided into Southern, Middle and Northern Rocky Mountains along with the Black Hills, which are differentiated mostly by the amount of rainfall each season. The mountain province of the temperate desert division in the Nevada and Utah Mountains is semidesert with a coniferous forest and alpine meadows.