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

Food Chain

4

Food Web

5

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

Mutualism

26

Parasites and Hosts

27