SB9g Biodiversity and Humans

Question 1

why can disease spread easily in fish farms?

Answer 1

uneaten food and faeces build up in small living spaces causing pollution and disease

Question 2

how is the human population damaging aquatic ecosystems?

Answer 2

population is increasing so fish stocks are being overfished which causes damage

Question 3

why are fish farms better than overfishing?

Answer 3

fish farms produce more fish without damaging wild populations

Question 4

how can non indigenous species affect food chains?

Answer 4

can be harmful to native animals or crops

Question 5

example of harmful species being introduced to another place?

Answer 5

cane toads introduced to Australia are poisonous to native animals, which kills them if they eat the toads

Question 6

eutrophication?

Answer 6

introduction of nutrients to ecosystems from farming

Question 7

eutrophication process?

Answer 7

~fertiliser added to fields and is washed off into rivers and water systems
~fertiliser contain nitrates and phosphates, which encourages algal growth on the surface of water
~surface plants clock sunlight below, so stop photosynthesizing
~bacteria break down the dead plants and use up the oxygen
~aquatic animals and fish die due to lack of oxygen