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Desert Biomes

Definition of biome, desert biome, types of desert biomes
by

Paxton Oberg

on 8 March 2011

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Transcript of Desert Biomes

Desert Biomes larger terrestrial regions characterized by similar climate, soils, plants, and animals regardless of where they are foundin the world have little precipitation and little vegetation and are found in tropical, temperate and polar regions Deserts area where evaporation exceeds precipitation
found mostly in tropical/subtropical regions
cover 30% of earth's land surface
O
I
L little vegetation/ moisture to help store heat, so sun warms them up during the day but at night the heat slips quickly into the atmosphere, leaving you sweating during the day and freezing at night Tropical Deserts hot and dry most of the year
few plants and hard, windblown surface strewn with rocks and some sand Temperate Deserts Daytime temperatures high in summer, low in winter
more precipitation than in tropical deserts
sparse vegetation consisting of widely dispersed drought resisdent shrubs, cacti, or other succulents adapted to lack of water and temperature vegetations Cold Deserts sparse vegetation
cold winters, warm/hot summers
low precipitation Survival Plants Animals adaptations: 2 themes
1. beat the heat
2. every drop of water counts succulent plants
no leaves which can loose H2O due to evapotranspiration
store water and synthesize food in their expandable fleshy tissue
reduce water loss by opening up their stomata to take up CO2 only at night use deep roots to tap into ground water
OR
use widespread shallow roots to quickly collect rain water evergreen plants conserve water by having waxcoated leaves that reduce water loss
annual wildflowers/grasses store biomass in seeds that remain inactive sometimes for years until they have received enough water to germinate
these seeds germinate, grow, produce new seeds, and die all in a few weeks
small
hide in borrows or rocky crevices to beat the heat during the day
some become dormant during long periods of extreme heat
insects and reptiles have thick outercoverings to reduce loss of water through evaporation
wastes are dried feces and dried concentrate of urine
get water from dew/ food they eat Desert Ecosystem F R A G I L E Soils take a long time to recover from disturbances because of slow plant growth, low species diversity, slow nutrient cycling, and lack of water
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