Ecology III: Human impacts

Question 1

List the main human threats?

Answer 1

Domino affect
Invasive species
Habitat at loss
Direct exploitation
pollution
climate change.

Question 2

What is overfishing an example of?

Answer 2

Direct exploitation.

Question 3

Effects of overfishing?

Answer 3

• Causes decline in mean trophic level
• Forces habitats to modify or they are destroyed.
• Affects biological interactions between predator and prey and competitors.
• Causes changes in marine food webs.
• Causes altered ecosystem structure and function.

Question 4

Where are most rhinos located so therefore were is most rhino poaching concentrated?

Answer 4

South Africa.

Question 5

List methods of habitat loss.

Answer 5

Degradation, clearance, erosion, damage, overgrazing, climate change.

Question 6

What’s the issue with bottom trawling?

Answer 6

Drags along seabed with two trawles and a huge net which makes disorientating sounds to the fish. Captures everything including coral and inedible fish which are often killed or injured in the process.

Question 7

Give an example of introduction of a non-native species?

Answer 7

Cane toads in Australia.

Question 8

What’s the domino ripple effect?

Answer 8

Removal or addition of a pivitol species that will effect the entire ecosystem.

Question 9

What’s an umbrella species?

Answer 9

Species that when conserved, in turn cause other species to be conserved by the conserver indirectly. Cheaper for consumer and it means less testing has to be done.

Question 10

What’s pollution?

Answer 10

Bioaccumilation of pesticide residues.

Question 11

Give me information on organochloride in relevance to bioaccumulation.

Answer 11

• Insectiside
• Banned in 1972
• Takes 15 years to entirely break down.
• Toxic to freshwater organisms.
• Causes thinning of bird eggs to decrease population size and reproductivity at all trophic levels.

Question 12

What is constantly increasing?

Answer 12

Ocean temperature.

Question 13

Extinction correlates with human growth. Well that’s gun.

Answer 13

yyeeaahh……………

Question 14

What are the main reasons humans care about biodiversity?

Answer 14

• Use for food.
• Products for medicine.
• Extinction makes study of species interaction and ecology difficult.
• Ecosystem services include prevention of soil erosion, regulation of hydrochloric cycles, detoxifaction and recycling or waste products.
• Economic benefit from raw materials for industry and tourism.
• Locations called hotspots have unusually rich local diversity, usually large proportion of Edemea species.