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Interactions and Changes in Ecosystems

Natural and Human causes of change Page 48.
by

Ms. Fanone's Class

on 21 September 2015

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Transcript of Interactions and Changes in Ecosystems

Sustainability
This refers to an ecosystems ability to sustain itself.

The ecosystem is able to keep all biotic and abiotic elements in perfect balance.
Bioinvasion
One of the reasons why ecosystems change.
New species of plants and animals are introduced into new environments which cause an imbalance in the system.
Why ecosystems change...
Interactions and Changes in Ecosystems
Limiting Factors
In all ecosystems, populations of biotic elements are controlled by factors such as food availability, predators, climate, and suitable habitat.
The Lamprey
For years, there was an abundance of fish in lake Ontario but in 1960 the lamprey was introduced.
It is a jawless fish was introduced in the food web.
It had NO predator, so its population increased while the population of salmon and trout decreased as the lamprey consumed them all.
Native Species: things naturally found in the ecosystem.
Introduced Species: things brought into the ecosystem.
Invasive Species: things that are brought in and take over the ecosystem.
Zebra Mussels
(Invaders)
Zebra mussels were introduced into the Great Lake system, and had no predators.
They multiplied and found great habitats.
However they clog the piping systems in the water treatment facilities which in turn caused damage to machinery.
Competition

All species are in constant competition for resources to meet their basic needs.

They compete for food, habitats, and water sources

Stronger species will survive while the weaker die off.
Full transcript