09 - 9/13/10 Lecture 9 - Biomes, Succession Finish biomes...

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9/13/10 1 Lecture 9 — Biomes, Succession • Finish biomes • Succession Fynbos vegetation in South Africa Chaparral / shrublands Thick shrublands subject to intense fires Northern coast of Mediterranean, southern California, parts of South Africa, Chile, Australia Stable annual climate; so heavily settled Southern California is always burning up or caught in a mudslide! Hot and dry in summer, most rainfall falls in short, cool winter wet season Fires common, shrubs fire-adapted and must burn to reproduce “Development vs. Wildlife" – California gnatcatcher, Stephen's kangaroo rat Deserts • All are very dry, but there are two types – Warm and Cold (really more but…) • Drought resistant succulents (e.g., cacti) • Mountain ranges often block flow of water from precipitation or rivers – Rain shadow • Thus, evaporation exceeds precipitation • Plants and animals respond dynamically to different weather conditions – May skip breeding season if no rainfall Deserts, con’t. – Fragile systems subject to large impacts by disturbance (like tundra) – Subject to abuse by off-road vehicles – Native plants (cacti) often stolen for landscaping – Deserts are often used for dumps • Often viewed as valueless land Tropical Dry Forest (Scrub) Not as well known as rain forests, but cover huge areas of tropics Hold lots of plants and animals, although not as diverse as rain forests Extensive dry season during which leaves drop (much like temperate deciduous forest) Many trees flower in dry season so that flowers are not destroyed by rain Trees often have huge thorns (e.g., thorn forests of western Mexico) Habitat rapidly converted to farming or urban use Dry forest may be more endangered than jungle! Tropical Rain Forest (Jungle)
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This note was uploaded on 04/06/2011 for the course FNR 103 taught by Professor Staff during the Fall '08 term at Purdue University.

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09 - 9/13/10 Lecture 9 - Biomes, Succession Finish biomes...

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