What is the difference between habitat and niche?

1
What is the difference between habitat and niche?

• Agenda for Monday Jan 5th
• Finish/present posters
• Food chains

2

• If an ecosystem is to be self-sustaining it must
  contain a flow of energy.
• The pathways of energy through the living
  components of an ecosystem are represented by
  food chains and food webs.

3
All energy in an ecosystem starts with what?

• Agenda for Tuesday Jan 6th
• Finish notes
• Food chain practice

4
Food Webs and Food Chains

• All energy in an ecosystem starts with the SUN
• Producers use suns energy
• Make their own food - autotrophs

5

• Consumers eat other organisms (heterotrophs)
• Primary eat plants
• Secondary eat primary consumers
• Tertiary eat secondary consumers

6

• Types of heterotrophs
• Herbivores plant eaters
• Carnivores meat eaters
• Omnivore both meat and plants
• Detritivores eat decomposing matter (detritus)

7
Decomposers

• Decomposers eat dead organisms (detritivores)

8
Food Chain

• Pathway of feeding relationships among organisms
  in an ecosystem
• Results in energy transfer (shown by arrows)

9
Food Web

• Interrelated food chains
• Shows energy transfer
• More complex more stable

10
Energy Pyramid

• Shows trophic (feeding) levels and energy
  available to each level
• 10 energy gets passed to each level
• Lose 90 (living/respiration)

11
Fill in the levels of the food chain with the
energy passed on.
1 J of energy
10 J of energy
100 J of energy
1,000 J of energy
10,000 J of energy
12
Fill in the levels of the food chain with the
energy passed on.
750,000 J of energy
13

• http//www.youtube.com/watch?vTE6wqG4nb3M

14
More biomass at the bottom -Less mass at upper
trophic levels WHY??
15
The coyote would be which of the
followingomnivore, carnivore, or herbivore

• Agenda for Thursday Jan 8th
• Go over HW/review food chains
• Biomagnification/Bioaccumulation

16

• Classify each member of the food web as autotroph
  or heterotroph. Identify the heterotrophs as
  herbivores, carnivores, or omnivores. Label as
  primary/secondary/tertiary consumer or producer

Organism Autotroph/heterotroph Primary/secondary/tertiary/producer Herbivore, carnivore, omnivore


17
Human Impact on food chains/food webs

• Introduced toxins
• DDT and eagles
• Extermination of a species
• Wolves

18
Biomagnification and bioaccumulation

• Biomagnification the increase in concentration
  of toxin as it passes through a food web
• Bioaccumulation accumulation of toxins in an
  organism
• accumulate faster than they are broken down or
  excreted

19
Biomagnification of a Toxin in Aquatic Environment
Amount of Toxin in Tissue
Level
Tertiary Consumer 3-76 µg/g ww (fish
eating birds)
Secondary Consumers 1-2 µg/g ww (large
fish)
Primary Consumers (small fish)
0.2-1.2 µg/g ww
Primary Producers (algae and aquatic plants)
0.04 µg/g ww