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Grasslands PowerPoint PPT Presentation

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Grasslands. Relatively little moisture. Why is this important? F ound in both temperate and tropical latitudes. Grasslands. 25–100 centimeters of precipitation annually insufficient for vigorous tree growth S oils in some grasslands are deep and fertile. Why?

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  • Relatively little moisture. Why is this important?

  • Found in both temperate and tropical latitudes


  • 25–100 centimeters of precipitation annually

    • insufficient for vigorous tree growth

  • Soils in some grasslands are deep and fertile. Why?

    • as a result, most of these areas have been converted to agriculture


  • Cool, wet Winters

  • Hot, dry Summers

  • Shrubland dominated by drought-resistant plants

  • Poor soil

  • Most species adapted to hot, dry conditions


  • One-third of Earth’s land surface

  • Defined by its lack of precipitation

  • Because desert air lacks moisture:

    • cannot moderate daily temperature fluctuations


  • Desert plants have small leaves and some produce enormously long tap-roots. Why?

  • A majority of the animal species are nocturnal. Why?

Tropical Rainforests

  • Warm temperatures

  • Approximately 12 hours of daylight year-round. Why?

  • Most biodiversity

    • home to almost 50% of Earth’s plant and animal species

  • More than 50% of tropical rainforests have been lost to logging and agriculture

Aquatic Biomes

Aquatic Biomes

  • Aquatic ecosystems cover about 75 percent of Earth’s surface

  • The salt content, water temperature, water depth, and speed of water flow are all defining characteristics of aquatic biomes

Aquatic Biomes

  • Two main types of aquatic biomes can be distinguished on the basis of salt content:

    • Freshwater biome

    • Marine biome

Aquatic Biomes Are Influenced byTerrestrial Biomes

  • Influenced by the terrestrial biomes they border or through which their water flows

  • Water drains from terrestrial biomes into aquatic biomes such as rivers and streams, which in turn carry nutrients from the terrestrial environments to the ocean

Aquatic Biomes Are Influenced Climate

  • Aquatic biomes are also strongly influenced by climate, which determines:

    • Water temperature

    • Depth

    • Salt content

Aquatic Biomes Are AlsoInfluenced by Human Activity

  • Wetlands and estuaries are often destroyed by humans to allow for development projects, while other aquatic biomes are negatively affected by pollution

Aquatic Biomes Are AlsoInfluenced by Human Activity

  • Aquatic biomes also suffer when humans destroy or modify the terrestrial biomes they occupy

Frasier River B.C.

Dead Zone- Gulf of Mexico

Lakes: Freshwater Biome

  • The productivity of a lake, and the abundance and distribution of its life-forms, is strongly influenced by:

    • Nutrient concentrations

    • Water depth

    • The extent to which the lake water is mixed

Detroit Lake

Rivers: Freshwater Biome

  • Riversare bodies of fresh water whose physical characteristics tend to change along their length and that move continuously in a single direction

North Fork of Santiam

Wetlands: Freshwater Biome

  • Wetlands:standing water shallow enough that rooted plants emerge above the water surface

  • Bogs: stagnant wetlands whose productivity and species diversity are low

  • Marshes and swamps: highly productive wetlands

Estuaries: Marine Biome

  • An estuary is a region where a river empties into the sea and is the shallowest of the marine ecosystems

  • The abundance and diversity of life make estuaries one of the most productive ecosystems on our planet

Newport Estuary

Coastal Regions: Marine Biome

  • The coastal region is the underwater area that stretches from the shoreline to the edge of the continental shelf and is among the most productive marine ecosystems

Coastal Regions: Intertidal Zone

  • The intertidal zone is the part of the coast that is closest to the shore and extends from the highest tide mark to the lowest tide mark

Coastal Regions: Benthic Zone

  • The Benthic zone can be as deep as 200 meters (656 feet) below the water surface

  • Relatively stable habitat

  • Rich sediment containing the dead and decaying remains of organisms

Oceanic Region: Marine Biome

  • Productivity in the oceanic regionis limited by nutrient availability

  • The oceanic region begins about 40 miles offshore and is relatively nutrient-poor

  • The abyssal zone begins where the continental shelf ends and the seafloor drops to a depth of approximately 6,000 meters (almost 20,000 feet)

Understanding the Interconnected Web

  • The organisms and physical environments of the biosphere can be thought of as forming a web of interconnected relationships

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