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Temperate Desert Biome (APES period 3)
Transcript of Temperate Desert Biome (APES period 3)
Temperate Deserts Animals and
their adaptations Plants and
their adaptations Human Impact Recreational use of off-road vehicles is the most damaging human activity to temperate deserts
It compacts the soil, makes landscape more susceptible to wind, water erosion, destroys vegetation and reduces animal populations
Invasion of non-native plants through human-caused habitat destruction displaces native species and increases fire risk Overgrazing by cattle and sheep have led to soil compaction, erosion, introduction of agressive non-native weeds
Military exercises cause extensive damage to plants and soil In temperate deserts, daytime temperatures are high in the summer and low in the winter.
Precipitation is low--less than 100 cm annually and all precipitation tends to fall during one season of the year
Average annual temperature is less than 10 degrees Celsius Examples of animals that thrive in temperate deserts: rock hyrax, zebratail lizard, bactrain camel
Many animals that live in temperate deserts have slender bodies with long limbs, which are better for shedding heat
They often life a nocturnal lifestyle
Often live in burrows Adaptations for reducing water loss include specialized snouts, waxy body coatings, and efficient kidneys
For example: the kangaroo rat never needs to drink liquid water because they get all the water they need from the food they eat Adaptations:
Reduction of leaves, instead have spines that protrude from the plant to reduce the amount of water lost to enviroment
Development of the stem as a major photosynthetic structure (above right and right). Less leaves to pick up energy from sunlight for photosynthesis means this process must occur somewhere
Water storage in the stem Development of defense structures most obviously the prickly spines, help protect the plant from predators eating them. In addition some desert plants have chemical defenses as well.
Coating the plant with a thick waxy cuticle helps reduce water loss. Some plants include prickly pear, saguaro cactus, trichomes, yellow palo verde A dense coating of hairs (trichomes) slows air moving over plant surface decreasing the speeding up of evaporation. The trichomes make a bubble of humid air surrounding the plant
Extensive underground root systems can either grow straight down to groundwater, or spread out under the soil. Temperate deserts occupy the drier parts of the shaded areas in the map above. There are no other names for temperate deserts. Some Temperate deserts include: The Mojave Desert The Sonoran Desert Great Basin Desert Interesting Facts about Temperate Deserts Under the Koppen-Trewartha system, temperate deserts are classified as a BWk desert. This signifies that at least 1 month has an average temperature below 32F (0C). Temperate deserts have the lowest relative productivity compared to the Earth's other biomes. North America is home to four temperate deserts: the Sonoran, the Mojave, the Great Basin, and the Chihuahuan.