GROUP FOUR GROUP FOUR DEVON PROJECT DEVON PROJECT

Group 6: Peya Brock, Group 6: Peya Brock, Paige Gilligan, Robert Paige Gilligan, Robert Kingsley and Yuki ShindoKingsley and Yuki Shindo

AimAim

To find the correlation between To find the correlation between temperature, oxygen levels and number temperature, oxygen levels and number of living organisms in the stream.of living organisms in the stream.

HypothesisHypothesis

The higher the temperature and oxygen levels, The higher the temperature and oxygen levels, the more living organisms there will be in the the more living organisms there will be in the stream due to organisms needing oxygen tend stream due to organisms needing oxygen tend to gather where oxygen is denser.to gather where oxygen is denser.

Physics: Where the gradient of the slope is Physics: Where the gradient of the slope is high, due to gravity the velocity of water would high, due to gravity the velocity of water would be faster thus the temperature would be be faster thus the temperature would be warmer due to more friction. warmer due to more friction.

Biology and ESS: How abiotic factors, such as Biology and ESS: How abiotic factors, such as temperature and oxygen, effect the biotic temperature and oxygen, effect the biotic factors in stream. factors in stream.

MethodMethod

Starting up stream we measured the Starting up stream we measured the temperature, oxygen levels and kick sampling temperature, oxygen levels and kick sampling for the number of living organisms. for the number of living organisms.

We collected three samples for the oxygen We collected three samples for the oxygen levels per site so that an average could be levels per site so that an average could be taken.taken.

At each site we picked a point which was 3cm At each site we picked a point which was 3cm deep. deep.

VariablesVariables

Controlled:Controlled:DepthDepthNumber of kicksNumber of kicks

Independent:Independent:SitesSites

DependentDependentTemperatureTemperatureDissolved oxygen levelDissolved oxygen levelNumber of organismsNumber of organisms

Site Temp. ( C )Dissolved Oxygen (mg/L) No. of organisms

1 13.5 7.699 8

2 13.5 7.498 14

3 13 7.215 10

4 13 7.106 10

5 13 6.795 20

Data presentationData presentationTemperature at each site

*Distance between each site is inconsistent.

12.8

12.9

13

13.1

13.2

13.3

13.4

13.5

13.6

1 2 3 4 5

Site

Tem

p.

Celc

ius

6.76.86.9

77.17.27.37.47.57.67.77.8

1 2 3 4 5

Site

Dis

olv

ed O

xig

en (

mg

/L)

Dissolved oxygen at each site

*Distance between each site is inconsistent.

Number of organisms at each site

*Distance between each site is inconsistent.

0

5

10

15

20

25

1 2 3 4 5

Site

No

. o

f O

rgan

ism

s

Dissolved oxygen against Number of organisms

Since temperature remained constant, it would not have an effect on the number of organisms.

0

5

10

15

20

25

6.6 6.8 7 7.2 7.4 7.6 7.8

Dissovled Oxygen

No

. o

f O

rgan

ism

Site OneSite One

Site TwoSite Two

Site ThreeSite Three

Site FourSite Four

Site FiveSite Five

EvaluationEvaluation

As we moved down stream, the sites As we moved down stream, the sites progressively became more and more progressively became more and more disturbed. Organisms had already disturbed. Organisms had already become kicked up and therefore made become kicked up and therefore made our data collection harder and less our data collection harder and less accurate. accurate.

The temperature also did not change The temperature also did not change drastically and this affected the overall drastically and this affected the overall outcome of the experiment. outcome of the experiment.

ConclusionConclusion

We were not able to prove or disprove our hypothesis, We were not able to prove or disprove our hypothesis, because of the disturbance of the sites.because of the disturbance of the sites.

This experiment did not prove the physics point of view This experiment did not prove the physics point of view because there was no temperature difference.because there was no temperature difference.

However from our data we were able to conclude that However from our data we were able to conclude that oxygen levels decreased as we moved downstream oxygen levels decreased as we moved downstream because the gradient of the river was steeper around because the gradient of the river was steeper around site 1 and that makes the water mix with air, thus site 1 and that makes the water mix with air, thus having more oxygen. having more oxygen.

Group 6Group 6