ISB 202 Lecture Notes - Lecture 3: Polar Ice Cap, Arctic Vegetation, Soil Salinity

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ISB 202 Full Course Notes
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ISB 202 Full Course Notes
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Biomes determine distribution of earth"s terrestrial biodiversity. Precipitation low, irregular: avg less than 10in/year. Hot by day, cold by night: semidesert. In semiarid zones, between desert and grassland or dry woodland. Adapted to long dry spells and brief, often heavy, rains: adaptations for survival in deserts. Maximize obtaining/conserving water: desert adaptations of plants. Dormancy in dry season- dop leaves, minimize metabolism. Reduce water loss by opening pores to take up co2 only at night. Biomass storage in dormant seeds- grow quickly after rains: animal body adaptations: Heavy armor to minimize evaporation- insects, reptiles. Concentrated, dry feces, urine- ability to get water from dew, food: human impacts to deserts. Renewable on short time scale- plants grow from the base. Tundra: polar, alpine: plant adaptations to grasslands. Wind-pollinated: easy to spread pollen when there"s a lot of wind and not much in the way. Survival in saline soil: human impacts to grasslands. Whole ecosystems adapted for local climates gone.

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