The ecology of California can be understood by dividing the state into a number of ecoregions, which contain distinct ecological communities of plants and animals in a contiguous region. The ecoregions of California can be grouped into four major groups: desert ecoregions, Mediterranean ecoregions, forested mountains, and coastal forests.
The Intermountain West, or Intermountain Region, is a geographic and geological region of the Western United States. It is located between the Rocky Mountain Front on the east and the Cascade Range and Sierra Nevada on the west.
The Mountains of Central Asia are a biodiversity hot spot designated by Conservation International which covers several montane and alpine ecoregions of Central Asia, including those of the Pamir and Tian Shan ranges, and extending across portions of Afghanistan, China, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan and the Karakoram range in China, Pakistan and India. The Karakoram range is also famously known for Karakoram Anomaly that relates to the anomalous growth of glaciers in the central Karakoram that is in contrast with melting glaciers in other mountainous ranges of Himalayas and other parts of the world due to the effects of climate change.
The Great Basin montane forests is an ecoregion of the Temperate coniferous forests biome, as designated by the World Wildlife Fund (WWF).
Sayram-Ugam National Park, also Sairam-Ugam, is a mountainous region of the Western Tian Shan Mountains, on the border with Uzbekistan. Ugam-Chatkal National Park of Uzbekistan is across the border, and Aksu-Zhabagly Nature Reserve of Kazakhstan is directly to the northeast along the border. The area has high levels of species diversity, covering floral communities from steppe to high altitude zones. It is particularly known for stands of juniper forests, and stands of fruit and nut trees. Sayram-Ugam is located in Kazygurt District, Tole Bi District and Tulkibas District of South Kazakhstan Region. The park boundary is 30 kilometres (19 mi) southeast of the regional city of Shymkent, and 50 km northeast of the Uzbekh capital of Tashkent.
Zhongar-Alatau National Park, also Jungar Alatau, or Dzungurian Alatau, was created in 2010 to protect the unique ecology of the Dzungarian Alatau, an isolated, glaciated mountain range in Kazakhstan, on the southeastern border with China. One stated reason for creating the park is to protect forests of wild fruit trees, including apricots, barberry, cherries, and currants. Approximately 1% of the land area of the park is forested with Sievers Apple trees, which are the progenitors of all cultured apple varieties in the world. The park is 300 km long (west-to-east), and spreads across Aksu District, Sarkand District and Alakol District of Almaty Region, 300 km northeast of the regional city of Almaty.
The Qilian Mountains Conifer Forests ecoregion is an ecoregion that consists of a series of isolated conifer forests on the northern slopes of the Qilian Mountain Range, on the northeast edge of the Tibetan Plateau in Qinghai and Gansu provinces of north-central China.
The Helanshan montane conifer forests ecoregion covers an isolated, forested mountain range surrounded by desert and semi-arid basins. As such, it has been called a "mountain island in the sky", and supports endemic species of plants and animals. The region supports the endangered Helan Shan pika.
The Tian Shan montane conifer forests ecoregion covers the "forest belt" of the Tian Shan mountains - generally the north-facing slopes that get enough moisture, and are warm enough, for trees to grow. This conifer belt is found mostly between 1,500 and 2,700 meters.
The Tian Shan montane steppe and meadows ecoregion covers a 2,000 km long stretch of grasslands of the isolated Tian Shan mountains of Central Asia. It is characterized by high-altitude flat and rolling grasslands.
The Tian Shan foothill arid steppe ecoregion covers the northern and western approaches to the Tian Shan mountains, centered on Lake Issyk-Kul in Kyrgyzstan. This region receives more moisture from Central Asia, thereby supporting more vegetation and diversity of plant and animal species than the deserts to the south.
The Pamir alpine desert and tundra ecoregion covers the high plateau of the Pamir Mountains, at the central meeting of the great mountain ranges of Central Asia: Himalaya, Karakoram, Hindu Kush, Kunlun, and Tian Shan. It is a region of relatively high biodiversity due to its central location and high elevation differentials, but it also acts as a barrier between the climate and habitats of north and south Asia.
The Central Asian riparian woodlands ecoregion is spread out across the deserts and plains of central Asia between the Aral Sea and the mountains 2,000 kilometres (1,200 mi) to the east. The long narrow components of the ecoregion follow the large rivers fed by snowmelt, and provide critical habitat for migratory birds as they travel through the arid region. The vegetation is referred to as tugai, characterized by low tangles of trees and brush along the edges of the rivers and associated wetlands, and fed by groundwater instead of precipitation.
The Central Asian southern desert ecoregion is an arid but ecologically active region between the east coast of the Caspian Sea and steppes at the base of the mountains of central Asia. Most of Turkmenistan and eastern Uzbekistan is in this ecoregion. The winters are milder than in the cold desert to the north, and a large number of endemic species have adapted to living in the particular climate and soil of the region. As with sandy deserts in general, the region is notable for high numbers of endemic species of reptiles and insects.
The Kopet Dag woodlands and forest steppe ecoregion coincides with the Kopet Dag mountains, straddling the southern border of Turkmenistan and the northeastern border of Iran. The region is one of high biodiversity, as it includes a full range of altitude zones, and variety of habitats included juniper-wooded slopes, montane grasslands, and tugay.
The Alai-Western Tian Shan steppe ecoregion covers the foothills on the western edge of the Tien Shan and Alay Mountains of Central Asia. This territory is mostly in southeastern Uzbekistan, with a portion running north into Kazakhstan on the east side of the Syr Darya River, and a small portion in Turkmenistan.
The Kuh Rud and Eastern Iran montane woodlands ecoregion covers hills and mountains in central and eastern Iran. The habitat is wetter and cooler than the surrounding desert of the Iranian Plateau, supporting the vulnerable goitered gazelle and small populations of the cheetah. The ecoregion is under conservation threat from overgrazing and conversion of steep slopes to cultivation.
The Baluchistan xeric woodlands ecoregion covers the middle elevations of a series of mountain ranges of western Pakistan and northeastern Afghanistan, reaching 1,200 kilometres (750 mi) from the Arabian Sea in the south to the Hindu Kush Mountains and the Himalayas in the north. The characteristic vegetation is xeric (dry) woodlands of shrubs and herbaceous cover. The region has rich biodiversity but relatively few endemic species.
