Chapter05

Chapter05 - Biomes and Landscapes Management and...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Biomes and Landscapes Management and Restoration Dr. B. office hours by aptmt Test next Tue Study in groups of 3-5 Practice Test & Study Guide on web page
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
After studying Ch 5 you should know major ecosystem types be able to describe ways humans impact or disrupt major ecosystems know characteristics of major aquatic and terrestrial biomes understand why marine, nearshore, and wetland biomes are important to survival and function of terrestrial ecosystems
Background image of page 2
Major Types of Ecosystems = Biomes Go to the World’s Biomes site to learn about Aquatic Desert Forest Grassland Tundra
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Biomes Biomes - areas sharing similar climate, soil conditions, and communities ± Temperature, Precipitation, and Nutrients are among the most important determinants ± Terrestrial biomes depend most on temp and precip; identified by the dominant plants of their communities (mostly 2D) ± Aquatic biomes depend most on sunlight penetration, temp, and the concentration of dissolved nutrients; identified by the dominant animals of their communities (always 3D)
Background image of page 4
Deserts 30% Earth’s land surface Naturally occur ~ 30 o N and S latitudes Infrequent / unpredictable precip. (< 50 cm / yr) Plants and animals exhibit water conservation characteristics Wide daily and seasonal temp fluctuations; not all deserts are hot ! Threatened by overgrazing and deforestation Soils are easily disturbed by human activities, and slow to recover
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Grasslands 30% Earth’s land surface Grasses, seasonal herbaceous flowering plants, and open savannas Few trees due to inadequate rainfall & frequent fires Large daily and seasonal temp fluctuation Generally too dry for raising crops Historic grazing by roaming herds of large ungulates Threats are conversion to farmland and overgrazing
Background image of page 6
Grassland types Prairie – treeless grassy plain ± We have biodiversity of US prairies due to extensive planting w/ domesticated grasses Savannah - grasslands with widely scattered trees ± Homo sapiens probably evolved here
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Forests 36% Earth’s land surface Cool coniferous Cool coniferous Temperate mixed Temperate mixed Temperate moist Temperate moist Tropical moist Tropical moist Dry woodlands Dry woodlands
Background image of page 8
Forests: Cool Coniferous Needle-bearing evergreen trees that produce seeds in cones; not all evergreens are conifers Leaf structure and thick waxy coating reduce water loss ± Survive harsh winters or extended droughts and accomplish photosyn- thesis even under poor conditions Fire often plays essential role in maintenance Boreal Taiga
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Forests: Cool Coniferous (cont’d) Boreal – Northern areas (45° - 60° N latitude) ± Mixed 4-5 spp coniferous and deciduous trees ± Moist and cool climate; abundant streams and wetlands ; thick humus soil layer ± Biggest threat is timber industry
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/22/2008 for the course BIOL 103 taught by Professor Brown during the Spring '08 term at VCU.

Page1 / 35

Chapter05 - Biomes and Landscapes Management and...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online