7 Ecosystem Changes And Conservation Strategies For Biodiversity

Question 1

What is an introduced species? How do they become invasive

Answer 1

An introduced species are species that humans have intentionally or unintentionally moved from their native location to a new ecological region.
Introduced species become invasive if they manage to establish populations in new areas. Invasive species are also referred to as pests.

Question 2

What are some examples of invasive species?

Answer 2

• foxes
• feral camel
• wild dog
• feral cat
• feral pig
• rabbit
• cane toad

Question 3

What types of BIOLOGICAL control manage pests in WA?

Answer 3

Biological control is the management of a pest through the use of their natural enemies (biological control agent). A biological control agent is an organism such as a virus, insect or plant disease. Scientists favour this method

Question 4

What types of CHEMICAL control manage pests in WA?

Answer 4

The control of invasive species using baits or pesticides.

Question 5

Pros vs cons of chemical control

Answer 5

Pros
- Manages introduced predators.
- Led to population increases for many native species eg mammals birds and reptiles.
-

Cons
- baits are poisonous to humans and will kill domestic cats and dogs.
- costly
- pesticides can be ecologically damaging

Question 6

What are the most common chemicals used in baits

Answer 6

1080 and strychnine are most common baits

Question 7

What are common greenhouse gasses

Answer 7

CO2 - carbon dioxide
H2O - water
CH4 - methane
N2O - nitrous oxide
CFCs - chlorofluorocarbons

Question 8

What greenhouse gas was the main cause of the depletion in the ozone layer?

Answer 8

CFCs - chlorofluorocarbons

Question 9

What is dryland salinity?

Answer 9

By removing deep rooted native vegetation and replacing it with shallow rooted crops, the amount of water being absorbed decreases, causing ground water levels to rise which brings salt upwards making the soils salty and undesirable

Question 10

What is an algae bloom?

Answer 10

A rapid increase in the population of algae and other micro organisms at the surface of a water body. Tends to block sunlight from entering the water.

Question 11

Hypoxic vs anoxic

Answer 11

Hypoxic is little oxygen anoxic is no oxygen

Question 12

Define biomagnification

Answer 12

The sequence of processes in an ecosystem where higher concentrations of a particular non-biodegradable chemical accumulate in the tissues of organisms at higher trophic levels

Question 13

What are the negative effects of bottom trawling ?

Answer 13

Bottom trawling is a destructive method of fishing where you drag a large net across the sea floor.
Destroys ecosystems on the sea floor

Question 14

What are brush corridors?

Answer 14

Strips of regenerated land between isolated habitats, which reconnect sub populations

Question 15

What is fragmentation?

Answer 15

The separation of some parts of the habitat of an ecosystem into isolated sections
can be the result of habitat destruction for land clearing for agriculture, rights or urbanisation