THE WEB OF LIFE

1
THE WEB OF LIFE

• ALL ORGANISMS INTERACT BOTH WITH THEIR
  ENVIRONMENT AND WITH OTHER ORGANISMS

2
The Web Of Life

• This red fox is dependent on many things in its
  environment.
• What examples of living things is the fox
  dependent on that might be in photo?

3
The Web Of Life

• What are examples of nonliving things that the
  fox might be dependent on in this photo?

4
ECOSYSTEM

• An ecosystem is all the living things and non
  living things in a particular area

5
Biotic Vs. Abiotic

• The nonliving portion of an ecosystem is the
  abiotic all the living is the biotic

6
The Web Of Life

• Much as the strands of silk in a spiders web
  bind one segment to another, feeding and other
  interactions bind all organisms to one another.
• These complex network of interactions between
  living things are called the web of life.

7
Humans Are Part Of The Web Of Life

• Humans have the greatest impact of any living
  thing on the web of life
• If humans are to continue to thrive on earth, we
  must understand the interrelationships among all
  living things and modify our actions.

8
Organisms Interact With Organisms They Eat

• Grasshopper chews on a leaf
• As it jumps from one leaf to next it gets caught
  in a spiders web
• The spider kills and eats grasshopper

9
What need connects organisms based on who they
eat?

• Need for energy to live and to reproduce
• Need for nutrients to build more living tissue

10
Photosynthesis is important in the web of life

• Green plants capture energy from the sun and use
  it to make food

11
These Interactions are repeated everyday

• Animals that eat plants or other animals get
  energy indirectly

12
Web is very complex

• Caterpillars eat the plant
• How does that affect the grasshopper?

13
Web is very complex

• Without rain, the plant may die
• How would that affect the caterpillar and the
  grasshopper?
• Spider web might trap the grasshopper. How does
  that affect the plant and the caterpillar?
• A bird might eat the spider, or the grasshopper,
  or the caterpillar

14
The smallest chain in the web can have a major
effect on the connected organisms

• Think of how humans impact the web

15
Organisms also interact with nonliving things in
their environment

• List some nonliving things in environment that
  living things interact with
• Sun
• Temperature
• Soil
• Rainfall

16
TERMINOLOGY

• Nonliving material within an environment is
  called abiotic factors.
• Living things are called biotic factors.
• All the living things in a particular area is
  called a community.
• The community (biotic factors) plus the abiotic
  factors is called the ecosystem.