Biodiversity + humans- SB9

Question 1

what is the first step in eutrophication affecting an aqauatic ecosystem?

Answer 1

fertiliser is added

Question 2

what is the second step in eutrophication affecting an aqauatic ecosystem?

Answer 2

heavy rain washes fertilisers off- nitrates and phosphates dissolve in soil water

Question 3

what is the third step in eutrophication affecting an aqauatic ecosystem?

Answer 3

nitrates and phosphates not taken up by plants wash into stream

Question 4

what is the fouth step in eutrophication affecting an aqauatic ecosystem?

Answer 4

high nitrate and phosphate concentrations in water encourage rapid growth in algae and plants in water

Question 5

what is the fifth step in eutrophication affecting an aqauatic ecosystem?

Answer 5

surface plants block sunlight so plants in water die and stop producing oxygen via photosynthesis

Question 6

what is the sixth step in eutrophication affecting an aqauatic ecosystem?

Answer 6

bacteria that break down dead materials increase in numbers and use up more oxygen in the water

Question 7

what is the seventh step in eutrophication affecting an aqauatic ecosystem?

Answer 7

the oxygen concentration in water decreases

Question 8

what is the eighth step in eutrophication affecting an aqauatic ecosystem?

Answer 8

aqautic animals die due to lack of oxygen

Question 9

what is a general overview of how eutrophication can affect an aqautic ecosystem?

Answer 9

chemicals wash into streams
high chem concentrations in water increase growth
plants die due to lack of sunlight
bacteria use up oxygen eating dead plants
oxygen levels depleat and fish die

Question 10

what are the aims of fish farming?

Answer 10

produce more fish and reduce overfishing of wild fish

Question 11

why does fish farming cause issues?

Answer 11

so many fish kept in a small space
waste sinks to the bottom of the water which can change conditions which harm wild organisms
parasites and disease spread easier between fish so they need to be treated to live

Question 12

what are the 3 main ways that humas affect ecosystems that reduce biodiversity?

Answer 12

fish farming, introducing new species, eutrophication

Question 13

what is affected by new species in ecosystems?

Answer 13

indigenous / native species - organisms that have always been in the area

Question 14

what is eutrophication?

Answer 14

addition of more nutrients to an ecosystem than it normally has