Prairies of the great plains
•Descargar como PPTX, PDF•
2 recomendaciones•5,230 vistas
The document discusses the prairies of the Great Plains of North America. It describes three main types of prairies from east to west - tallgrass prairie, mixed grass prairie, and shortgrass prairie - which differ in their dominant grass species and climate due to decreasing precipitation. The prairies originated around 10,000 years ago after glacial retreat left grasslands too dry for forests to reestablish. Today, only small fragments of intact prairie remain due to agricultural and urban development.
Recomendados
Más contenido relacionado
La actualidad más candente
La actualidad más candente (20)
Destacado
Destacado (18)
Similar a Prairies of the great plains
Similar a Prairies of the great plains (20)
Más de Mark McGinley
Más de Mark McGinley (20)
Último
Último (20)
Prairies of the great plains
- 1. Prairies of the Great Plains Dr. Mark McGinley Honors College and Department of Biological Sciences Texas Tech University
- 2. Grasslands • Communities dominated by grasses – Plants in Family Poaceae • Two main types of grasslands – Tropical Savannah Grasslands • South America, Africa, Australia, Asia – Temperate Grasslands • North America, South America, Europe, Asia
- 4. Prairies • “Prairie” is the term used to describe temperate grasslands found in North America
- 5. Origin of the term “prairie” • The French got there before the English, and they had a word for it: prairie, their name for a meadow. But what they encountered, in what is now Indiana, Illinois, Iowa, and points north and west, was more than your everyday meadow. It was a seemingly endless sea of grass as high as a person's head, teeming with flowers and bugs and other critters. And not a tree in sight. • There was nothing like this in England, and no English word for it. Besides, the French, who were the first Europeans in that part of the country, had already taken to calling it prairie, so prairie it became. In English, it is attested as early as 1773 in the journal of a traveler on the Illinois River: "The lands are much the same as before described, only the Prairies (Meadows) extend further from the river." • By the early 1800s, as more and more travelers and settlers ventured into prairie land, the parenthetical definition was no longer needed. Prairie became a descriptive term for the distinctive flora and fauna of these lands • From Houghton Mifflin Word Origins
- 6. Distribution of Prairie in North America
- 7. Precipitation Map of USA
- 8. Three Main Prairie Types • Prairies can be divided into three main types from the east to the west • Tall Grass Prairie • Mixed Grass Prairie • Short Grass Prairie • Prairie types change from east to west as the climate becomes drier.
- 9. Prairie Climates • Prairies are found in temperate climates – Warm summers, cool to cold winters • Most prairie regions receive more precipitation in the summer than they do in the winter • Lower precipitation in the western prairie regions than in the eastern prairie regions
- 10. Origin of Prairies • The upwelling of the Rocky Mountains created a rain shadow in the middle of the continent so conditions became too dry for forests. • Most prairie soil was deposited during the last glacial advance that began about 110,000 years ago. The glaciers expanding southward scraped the landscape, picking up geologic material and leveling the terrain. • As the glaciers retreated about 10,000 years ago, it deposited this material. Wind deposits also form an important parent material for prairie soils. • Wikipedia
- 11. Vegetation During Last Glacial Maximum
- 13. Grasses • Grasses are members of the monocot family Poaceae • http://www.botany.wisc.edu/courses/botany _400/Lecture/0pdf/30bPoaceaeBW.pdf
- 14. Poaceae • 4th largest family - 620 genera, 10,000 species • most important family (ethnobotanically) important grain crops are all grasses Grasses are thought to have originated in South America, but have spread across the world - • first diversified about 70 mya in late Cretaceous in the understories of tropical forests
- 15. Vegetative Characteristics of Grasses • jointed, hollow, circular stems • leaves 2-ranked or spiralled • blade, sheath, and ligule • intercalary meristem above nodes
- 16. Adaptive Vegetative Features • intercalary meristem - allow plants to respond to grazing & fire • silica in stems - protects leaves from predators • C4 photosynthesis - allows for more efficient photosynthesis in warm and arid climates
- 17. Reproductive Characteristics of Grasses • Distinctive flower morphology • Wind pollinated
- 18. Tall Grass Prairie • Northern Tall Grasslands – Dominant grass species • big bluestem (Andropogon gerardii) • switchgrass (Panicum virgatum) • Indian grass (Sorghastrum nutans) • Only 5% remains undisturbed – Agriculture – 75% rated as heavily altered
- 19. Tall Grass Prairie • Central Tall Grasslands – Most mesic of the tall grass prairie ecoregions • Dominant grass species – big bluestem (Andropogon gerardii) – switchgrass (Panicum virgatum) – Indian grass (Sorghastrum nutans) – Converted to the “corn belt” • Very little remains
- 20. Tall Grass Prairie • Flint Hills Tall Grasslands – Shallow soil – Dominant grass species • big bluestem (Andropogon gerardii) • switchgrass (Panicum virgatum) • Indian grass (Sorghastrum nutans) – Not as much has been plowed because of shallow soil depth. – Lots has been grazed
- 21. Tall Grass Prairie Dominants Big Bluestem (Andropogon gerardii)
- 22. Tall Grass Prairie Dominants Switchgrass (Panicum virgatum)
- 23. Tall Grass Prairie Dominants Indian grass (Sorghastrum nutans)
- 24. Mixed Grass Prairie • Northern Mixed Grasslands – Dominant grass species • grama (Bouteloua gracilis) • little bluestem (Schizachrium scoparium) • needle-and-thread grass (Stipa comata) • Western wheatgrass (Agropyron smithii),
- 25. Mixed Grass Prairies • Central and Southern Mixed Grasslands – Dominant grass species • little bluestem (Schyzachrium scoparium) • western wheatgrass (Agropyron smithii) • grama grasses (Bouteloua cartipendala) – Only 5% remains intact
- 26. Mixed Grass Prairie Dominants Little Bluestem (Schizachyrium scoparium)
- 27. Mixed Grass Prairie Dominants Western wheatgrass (Agropyron smithii or Pascopyrum smithyii)
- 28. Mixed Grass Prairie Dominants western wheatgrass (Agropyron smithii or Pascopyrum smithyii)
- 29. Mixed Grass Prairie Dominants Blue Grama (Bouteloua gracilis)
- 30. Mixed Grass Prairie Dominants Needle-and-thread grass (Stipa comata)
- 31. Short Grass Prairie • Northern Short Grasslands – Dominant grass species • grama (Bouteloua spp.) • needlegrass (Stipa spp.) • wheatgrass (Agropyron spp.) – Only 2% remains intact • 85% grazed or cropland
- 32. Short Grass Prairie • Western Short Grasslands – Dominant grass species • grama (Bouteloua gracilis) • buffalo grass (Buchloe dactyloides)
- 33. Short Grass Prairie Dominants Buffalograss (Buchloe dactyloides)
- 35. Prairie Plant Root Systems
- 36. Prairie Fires
- 37. Prairie Animals- Large Grazers Elk Cervus elaphus American Bison Bison bison
- 38. Prairie Animals- Small Grazers Prairie Vole Microtus ochrogaster grasshoppers
- 39. Prairie Animals- Mammalian Predators Coyote Canis latrans Prairie Wolf Canis lupus
- 40. Prairie Animals Black Tailed Prairie Dog Cynomys ludovicianus
- 41. Prairie Animals