1.How is the number of sea urchins affected by the number of sea otters in this community? 2.How is the number of sea otters affected by the number of sea urchins?

2.1 Section Objectives – page 35 Compare variations, tolerances, and adaptations in different biomes Today’s Objective: Can be found in the book: Pg

Biomes are a group of ecosystems with similar climates and organisms. Review:

Rain Forests found near the equator

Abiotic Factors: Warm temps (Avg. 25° C) Large Amounts of Moisture High levels of Rainfall Rich Soil

Biotic Factors: Rainforests have more biodiversity than any other biome. Animals that can live in trees Organisms that need a lot of moisture (frogs/fungi) Organisms that don’t need a lot of light (under the canopy)

Desert Biomes

Deserts: areas that receive less than 25 cm of rain per year. Most deserts get very hot during the day and get very cold at night.

Abiotic Factors: Drastic Temp changes from day to night Very dry Very low levels of Rainfall Little or no topsoil

In the Desert Biome, plants (cactus) have the ability to hold water for later use and most animals (scorpion) are nocturnal.

Animals usually have thick shells or skin Get water from food, or store water (plants) Come out at night and burrow during the day

Grassland

Grasslands receive more rain than the desert - enough to support grasses and bushes, but not enough to support a lot of trees.

Abiotic Factors: Has a rainy season and a dry season Rich soil Temperatures vary throughout the year

Dominated by grasses Grazing animals Animals that can adjust to fit season- thicker coats in winter, burrow during extreme temps

Deciduous Forest

Abiotic Factors: Temperatures vary greatly- very cold winter, hot summer Annual rainfall (50-300cm) Soil- rich top layer, deep clay layer

Deciduous Forest The weather in this area changes with the seasons. It becomes very cold in the winter and hot in the summer. There is enough rainfall to support large trees.

Trees in this biome drop their leaves in the fall and new ones sprout each spring.

Nesting birds Diverse animals Animals that can adjust to fit season- thicker coats in winter, hibernating during extreme temps A lot of brown and green animals

Tundra

Abiotic Factors: Little annual rainfall Dry, very cold Soil- underneath thin topsoil- frozen ground, no nutrients in the soil

Treeless land Limited organisms due to low vegetation and extreme cold Only shallow-rooted grass and small plants Migration animals, very insulated Lot of white animals

Taiga: also known as northern coniferous

Abiotic Factors: A little warmer, and wetter than tundra Long severe winter, short mild summer Soil- poor in minerals and acidic

Coniferous trees- aspen, birch Large animals Animals with thick fur and that hibernate in severe conditions