FEBRUARY 18, 2015WARM UP: You need your ISN and textbook

*Abiotic and Biotic Factors

Title and take notes on p.112 in your ISN.Important: You will need to write all

information

marked with an asterisk *

Essential Question:

How do organisms depend on and compete for biotic and abiotic factors in an ecosystem?

*Abiotic factors are nonliving parts of the environment

* Examples: air, water, soil, rocks, light, and

temperature

*Organisms depend on many external factors and conditions in order to survive:

*Biotic factors are living parts of the environment

– * Examples: grasses, trees,

animals

BIOTIC• Cows• Grass• Trees• Shrubs

ABIOTIC• Air• Soil, rocks• Light • Temperature

Look at the picture below.

What are the biotic and abiotic factors observed?

* Limiting Factors

* Environmental factors that restrict the size of a population.

* Organisms COMPETE for these factors.

* Examples: food

water

shelter

available sunlight

Competition in a Food Web

Who’s competing for what in this terrestrial food web?

In this food web, the snake and hawk compete for the mouse. The grasses are competing for sunlight and carbon dioxide.

* Carrying Capacity:

* the largest number of individuals of one species that an environment can support

* Disease, space, predators and food are factors that limit carrying capacity

* Carrying capacity increases and decreases as the amount of resources changes

Textbook Assignment

Read and work Section 12.1 pp. 486 – 493.

Read and work Section 12.2 pp. 498 – 507.

Read and work Section 13.2 pp. 546 – 553.

Complete the above assignment silently and independently. We will be covering these topics on Thursday and Friday.