ECOLOGY Chapter 23.1

1
ECOLOGYChapter 23.1

• Nutrition Energy Flow

2
How do organisms obtain energy?

• Autotrophs-
• -Organisms that use energy from the sun or
  energy stored in chemical compounds to
  manufacture their own nutrients.
• Heterotrophs-
• -Organisms that cannot make their own food and
  must feed on other organisms.

3
You are what you eat

• Scavengers --- Animals that eat other animals who
  have already died.
• Decomposers--- Organisms that break down and
  absorb nutrients from dead organisms.
• Herbivore --- Eats only plants
• Carnivore --- Eats only meat (Carne)
• Omnivore --- Eats both plants and meat

4
Matter Energy Flow

• Food Chain-
• -simple model biologist use to show how energy
  and matter move through an ecosystem.

5

• Trophic Level-
• -a feeding step in the passage of energy and
  materials.
• 10 Law Only 1/10 of energy at lower level is
  passed on.

6

• Food Web-
• -model which expresses all feeding relationships
  at each trophic level in a community.

7
Cycles in Nature

• Water Cycle-
• -Life on Earth depends on water. The cycle is
  how water is moving from the atmosphere to the
  Earth.

8

• Carbon Cycle-
• -Life on Earth needs carbon molecules for
  sugars, fats, proteins. The cycle is how
  carbon moves through an ecosystem.

9

• Nitrogen Cycle-
• -How nitrogen gets used by the plants in the
  ecosystems. Nitrogen is important to living
  organisms.

10

• RECYCLE!