Webs and Chains

1
Community Interactions
Food Chains, Webs Pyramids

• Chapter 2.2

2
Trophic Level

• Who eats who in the food chain
• Steps along which materials energy pass
• Shown as food chains, webs pyramids

3
Food Chain

• ONLY ONE source of food
• Less stable

4
Food Web

• More than one choice of food
• Several food chains linked together
• More stable

5
Food Pyramid

• Tertiary
• Secondary
• Primary consumer
• Producer

6
Food Pyramid

• Tertiary
• Secondary consumer
• Primary consumer
• Producer

7
Food Pyramid

• Illustrates?
• Food Chain
• of numbers
• of biomass
• of energy

8
Food Pyramid

• 10 of the energy is passed on as biomass
• 90
• Lost as
• Waste
• Used for
• Reproduction

activity
heat
heat
activity
9
Biomagnification

• Magnification
• to increase
• Concentration of toxins
• Are magnified
• In upper pyramid levels

10
Biomagnification

• the top consumer
• requires more biomass
• and concentrates the toxin

11
Food Pyramid

• Human
• Shark
• Bass
• Smelt
• Algae
• Who is most susceptible ?

12
Cycles in Nature
13
Energy Flows...

• Flows in one direction
• Will never return to the same form
• Conservation of Energy
• Energy changes form
• But is never lost

14
Matter cycles..

• Matter can be recycled
• Matter can be reformed
• The basic building blocks are reused
• Conservation of Matter

15
Carbon cycle...
16
Tracing the cycling of matter..
17
Energy Matter in an Ecosystem