Life ScienceChapter 17
Relationships Among Organisms
1
Relationships
•Benefit
Twig ants live in trees and eat the acacias that typically destroy plants.
One organism only
Both organisms
Many organisms at once
2
Energy
• Matter is cyclic
• Energy is not
3
Biomass
6
The dried mass of the living matter in a given area of habitat
Ecological Pyramids
Note that only a small portion of energy is passed upward to the next level.
7
trophiclevels
What’s the problem with ecological
pyramids?
• Only useful for food chain
8
What’s the problem with ecological
pyramids?
• omnivores
9
Other problems with the pyramid
10
Non-energy Relationships
11
Independent Organisms
12
Couple Relationships
13
Animal Societies
14
Social Insects
15
Honeybee genetics
16
Fire Ants Make a Living Raft
17
Competition within Populations
18
Competition within Populations
19
Competition between Plants
20
Facets of Life Science: Dressed For
Success
21
Camouflage
Warning Coloration
Mimicry
Competition Between Populations
22
Predator-Prey Relationships
23
Commensalism- Scavengers
24
Commensalism- Epiphytes
25
Parasites and Hosts
27