roles in ecosystems
DESCRIPTION
Roles in Ecosystems. Habitat. A habitat is the place an organism lives. Ecological Niche. The ecological niche is an organism ’ s “ job ” in an ecosystem. It includes: its place in the food web where it lives the time of day it is active. Ecological Niche. - PowerPoint PPT PresentationTRANSCRIPT
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Roles in Ecosystems
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Habitat
A habitat is the place an organism lives.
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Ecological Niche
The ecological niche is an organism’s “job” in an ecosystem.
It includes:– its place in the food web– where it lives– the time of day it is active
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Ecological Niche
Each organism in an ecosystem usually has a different niche.
This helps to reduce the amount of competition for habitat and resources (like food, water, etc.).
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Do they have the same niche?
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Do they have the same niche?
1) Red-tailed hawk
- eats mice
- hunts in fields
- hunts during the day
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Do they have the same niche?
2) Eastern screech owl
- eats mice
- hunts in forests
- hunts at night
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Native vs. Introduced Species
A native species is a species (type of living thing) that has lived in an ecosystem for a long time.
An introduced species is a species that is new to an ecosystem.
Introduced species can arrive naturally (animals move, seeds carried by wind) or by humans.
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Impact of Introduced Species
Introduced species usually cause problems in an ecosystem.
They compete for a niche with the native species.
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Example - Starling
Sixty European starlings were released in North America in honour of Shakespeare.
There are now 200 million of them!
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Example – Cane Toad
Cane toads were introduced into Australia to control insects.
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Example – Cane Toad
They did not really help with the insects.
Now they are causing a lot of problems.
They are poisonous, so anything that eats them dies.
They are HUGE – and will eat anything they can swallow including many native species.
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Example – Rabbits
Rabbits were brought to Australia by people.
People brought rabbits to Australia.
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Example – Rabbits
When the rabbits multiplied, they tried many ways to stop them:- fences- viruses- fleas
Nothing has worked!
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Vocabulary
Habitat Ecological niche Competition Native species Introduced species
Make sure you know
these words!