• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12

An investigation to show the correlation between the number of different species found, and the B.M.W.P score of the environment.

Extracts from this document...

Introduction

Matthew Stone Introduction For an explanation on BMWP, refer to appendix 1. For background information on Osmington Bay, refer to appendix 2 Plan Hypothesis "The BMWP score will increase with the number of species found." This is because the larger the number of species, the more BMWP score there will be for the sample. With correlation to the environment, species that have a higher affinity for oxygen have a higher BMWP score. Therefore, if there is only one species in a riffle (a highly aerated and fast flowing part of the river, meaning high amounts of oxygen dissolved and low amounts of organic pollution), the BMWP score of the area will be higher than that of a pool (stagnant, little aeration, and large amounts of organic pollution (eutrification of the organic pollution causes low oxygen content)) with many species: Environment BMWP Score High aeration, high number of species High High aeration, few number of species Medium Low aeration, large number of species Medium Low aeration, few number of species Low Statistical Support Because I am trying to show the relationship between to different pieces of data, I will use the Spearman's Rank Co-efficient. Statistically, this will show whether the number of species found is significantly correlated to the BMWP score. I will therefore need to collect over 12 sets of data to make statistically analysing the data productive. ...read more.

Middle

* Wear appropriate clothing to be safe in river (stay dry, wont slip over on the bed), on road (so vehicles can see you). Results site number 1.1 1.2 Riffle/Pool Riffle Pool Description Bottom mill Width (M) 3.45 4.1 Depth Spacing (M) 0.86 1.03 depth1 (M) 0.16 0.15 depth2 (M) 0.17 0.21 depth3 (M) 0.15 0.19 dissolved oxygen (mg/l) 6.50 6.4 Velocity (M per Sec) 0.46 0.31 pH 7.50 7.5 Temp (�C) 10.2 10.2 Average sediment size (cm) 7.56 1.18 Number of species 6 5 BMWP Score 29.5 20 site number 2.1 2.2 Riffle/Pool Riffle Pool Description Width (M) 9.570 3.663 Depth Spacing (M) 2.390 0.910 depth1 (M) 0.280 0.230 depth2 (M) 0.110 0.250 depth3 (M) 0.130 0.210 dissolved oxygen (mg/l) 5.600 6.200 Velocity (M per Sec) 0.348 0.170 pH 7.500 7.500 Temp (�C) 10.500 10.220 Average sediment size (cm) 3.62 2.08 Number of Species 6 3 BMWP Score 24.5 18.5 site number 3.1 3.2 Riffle/Pool Riffle Pool Description Width (M) 5.50 5.30 Depth Spacing (M) 1.38 1.33 depth1 (M) 0.08 0.24 depth2 (M) 0.19 0.21 depth3 (M) 0.08 0.14 dissolved oxygen (mg/l) 4.80 4.40 Velocity (M per Sec) 0.53 0.14 pH 7.50 7.50 Temp (�C) 10.20 10.50 Average sediment size (cm) 6.36 9.00 Number of species 4 8 BMWP Score 15 25 site number 4.1 4.2 Riffle/Pool Riffle Pool Description Width (M) 5.42 5.42 Depth Spacing (M) 1.36 1.36 depth1 (M) ...read more.

Conclusion

Overall I have found many more species in the pools than in the riffles. I am convinced this is because pools have more sediment to kick up, so therefore I am more likely to pick up species. I have only been able to collect up to 6 species at a time. I cannot have collected all species that were present in the river, so the BMWP score that I have collected cannot be true. This makes my results extremely unreliable. The conditions of the river are not true for other rivers; in that there seems to be little diversity present. Although I found this on my pilot experiment, it was impossible to select another river to study to compare my results to. Limitations of methods Due to the tentative nature of this small experiment, there are several large errors that could occur with methods used. For example: kick sampling, as a method is very inaccurate. It is very hard to replicate same results each time such as the same number of kicks, kicking up the same amount of sediment each time, kicking with the same strength each time, kicking all sediment into the sweep net etc. The method used to calculate the velocity is very inaccurate. The red dye travelling the river was only "judged" to have crossed the meter rule. It was also impossible to place the dye in the same part of the river, other methods such as dropping an orange in the river along a meter rule proved no more accurate. Matthew Stone Page 12 of 12 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Living Things in their Environment essays

  1. Marked by a teacher

    Research question - Is using dogs for work ethical?

    5 star(s)

    in Dogs, the characteristics & the ethics from the Human and the Dog point of view so that I had a variety of questions to make my experiment more interesting and have a variety of answers. Data Dog Questionnaire with results: Do you have a dog as a pet?

  2. Marked by a teacher

    An experiment to investigate the species diversity in non-trampled and trampled areas.

    4 star(s)

    Nettles (Urtica dioica) are a herbaceous perennial, growing to 1-2m tall in the summer and dying down to ground level in the winter. It has widely spread roots. Humans and animal waste may be responsible for elevated levels of phosphate in the soil, providing an ideal environment for stinging nettles.

  1. Marked by a teacher

    An Investigation into a Woodlice's Preferred Choice of Environment.

    3 star(s)

    the woodlice are in the dark/wet environment, thus supporting my hypothesis that woodlice prefer a more dark and damp environment. EVALUATION As you can see, I had to amend my experiment, as I had not taken everything into account. After setting up most of my apparatus and collecting in my

  2. What amounts of vitamin C are in different brands of orange juice.

    The juices all have given amounts of vitamin C per 100ml on the packaging. They are as follows: Waitrose- 25mg Libby's (original)- 24mg Just Juice- 30mg Libby's (organic)- 25mg Tesco- 25mg Del Monte- 30mg Sunpride- 26mg Sunny Delight- 34mg These help to predict what will happen and which will have the highest concentration of DCPIP.

  1. Branded Bleach is more effective at killing E. coli than Non branded bleach - ...

    Although the depth of agar should be similar a gentle smoothing with the glass rod should help keep height equal. 3) Time bacteria are left in incubator The longer the bacteria are left in the incubator means the bleaches

  2. An investigation in the different species of plant life through bare sand and grassland ...

    28 10 15 6 27 -21 441 29 15 25 9 29 -20 400 30 100 0 29.5 13 16.5 272.25 0 4114.5 Once putting my results into the formula the answer I get is -0.08464 There is no correlation because it is a low negative number so therefore in

  1. An Investigation of the Diversity and Abundance of Ground Flora in Coppices of Different ...

    When there is more wind, then plants are able to transpire at a faster rate and thus they lose water through their leaves so therefore again I would expect less abundance and diversity of plant species in the young coppice.

  2. An Investigation into the water quality of the River Banwell in

    There are two specific ways that pollutants can end up in the river. These are called point sources and non-point sources. Point sources are when pollutants are directly released into the area via a pipe for example from a factory.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work