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Roles in Ecosystems
Habitat
– A ____________ is the place an organism lives.
Ecological Niche
The __________ _________ is an organism’s “job” in an ecosystem.
It includes:– ___________________________________– ___________________________________– ___________________________________
Ecological Niche
Each organism in an ecosystem usually has a different niche.
This helps to reduce the amount of ________________ for habitat and resources (like ________, ________.).
Do they have the same niche?
Do they have the same niche?
1) Red-tailed hawk
- ______________
- ________________
- ________________
Do they have the same niche?
2) Eastern screech owl
- ________________
- ________________
- ________________
Biodiversity
Biodiversity is _______________________
____________________________________; also known as biological diversity
Since organisms within an ecosystem have different niches, it allows for _______________________.
Native vs. Introduced Species
A ______________________ is a species (type of living thing) that has lived in an ecosystem for a long time.
An ____________________ is a species that is new to an ecosystem.
Introduced species can arrive naturally (animals move, seeds carried by wind) or by humans.
Impact of Introduced Species
_______________________ usually cause problems in an ecosystem.
They compete for a niche with the _________ species.
Example - Starling
Sixty European starlings were released in North America in honour of Shakespeare.
There are now 200 million of them!
Example – Cane Toad
Cane toads were introduced into Australia to control insects.
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.
Example – Rabbits
Rabbits were brought to Australia by people.
People brought rabbits to Australia.
Example – Rabbits
When the rabbits multiplied, they tried many ways to stop them:- fences- viruses- fleas
Nothing has worked!
Vocabulary
Habitat Ecological niche Competition Native species Introduced species
Make sure you know
these words!