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Biotic & Abiotic Factors in Ecosystems

Grade 9 Science

Jon Mark

on 19 May 2015

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Transcript of Biotic & Abiotic Factors in Ecosystems

Grade 9 Science
Sustainable Ecosystems & Their Interactions
Ecosystem: All the living organisms and their physical and chemical environment.
What is an Ecosystem?
Biotic Factors: Living things, their remains, and features associated with their activities (nests etc.)
The Parts of an Ecosystem
Abiotic Factors: Non-Living physical and chemical components of an ecosystem.
On page 34, choose two ecosystems and compare their characteristic abiotic, and biotic features.
Every Ecosystem is characterized by a distinctive set of features.
THe interaction between members of two different species that live close together.

Biotic Interaction: Symbiosis
When one organism consumes another organism for food.
Biotic Interaction: Predation
Consumed organism = prey
Organisms that eats prey = predator
This occurs when two organisms compete for the same resource, such as food, water or even sunlight.
Biotic Interaction: Competition
Abiotic characteristics are just as important as biotic ones.

Abiotic factors are needed by living things to survive
Abiotic Characteristics of
an Ecosystem
All organisms need water to survive
Plants and animals need oxygen to live. Even aquatic organisms need oxygen, they get it from the water.
Plants and other organisms (like algae) need light for photosynthesis - where they produce their own food (and ours!)
All organisms require nutrients to grow.

Example: Plants and animals need nitrogen & phosphorous
Provides nutrients for plants and a habitat for microorganisms
Easter Island: An Ecosystem Example:

Sustainable Ecosystems
Sustain = to endure and support
A sustainable ecosystem is one that is maintained through natural processes
What ecosystem was destroyed on Easter island? How did this affect the people living there?
All organisms require a sustainable ecosystem to survive
Ecosystems can be large (Boreal forest) or small (a rotting log).
Each ecosystem is composed of populations of plants and animals, and their biotic and abiotic environment:
Read the Assigned Article and Answer the Following:
Describe two different theories that explain what happened to the people on Easter island?
Why did this happen?
Was this preventable?
Further your Understanding
Using page 12 of your textbook. List at least 1 way that human behavior can affect abiotic characteristics of ecosystems.
Workbook Qs: Pg 4 -7
1-4, 6, 18-20, 23-25
Full transcript