1. Introduced Species
Unit 3.3

2. Species that are natural to an area
Species that are not natural to an area
they are transported into the area
by tourists
seeds stuck on ships, cars, traveler’s shoes
can help or have no effect on ecosystem
An introduced species that causes harm
high reproduction rate
are aggressive competitors
have no predators

4. Invasive Species in BC, 2014

5. Invasive species can damage/remove native species from an ecosystem in 4 ways:
Competition
Predation
outcompete native species for resources
grow really fast
roots choke roots of native species
if the native species have never been hunted before, they lack the adaptations to survive predation

6. Predation
Invasive species of rat hunts on a native bird’s eggs, causing the bird population to decline.
The invasive bullfrog hunts mice, which have never been hunted before by bullfrogs and thus lack natural defense mechanisms.

7. Invasive species can damage/remove native species from an ecosystem in 4 ways:
Competition
Predation
outcompete native species for resources
grow really fast
roots choke roots of native species
if the native species have never been hunted before, they lack the adaptations to survive predation
Disease and Parasites
if native species have never been exposed to foreign diseases and parasites before, they can get wiped out
detrimental if keystone species affected

8. Disease and Parasites
A parasitic fungus. Its spores was transported on the fur of an invasive animal. The native trees have never been exposed to this before, and so are very susceptible to the attack.

9. Invasive species can damage/remove native species from an ecosystem in 4 ways:
Competition
Predation
outcompete native species for resources
grow really fast
roots choke roots of native species
if the native species have never been hunted before, they lack the adaptations to survive predation
Disease and Parasites
Habitat Alteration
if native species have never been exposed to foreign diseases and parasites before, they can get wiped out
detrimental if keystone species affected
invasive species can
change light levels
change soil chemistry by releasing toxic compounds
upset natural nutrient cycling

10. Habitat Alteration
This particular aquatic weed grows so fast it covers the surface of the water, blocking sunlight for life below.

11. Habitat Alteration
This wetland weed excretes toxins from its roots that disintegrates the roots of plants growing near it, thereby conquering more territory.

13.
A photo album on BC’s invasive species. Check it out 