• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigation of the distribution and abundance off reshwater invertebrates in the Tillingbourne River at Abinger Hammeron Thursday, 17th of October 2002

Extracts from this document...

Introduction

Investigation of the distribution and abundance of freshwater invertebrates in the Tillingbourne River at Abinger Hammer on Thursday, 17th of October 2002 Introduction My research is about the distribution and abundance of freshwater invertebrates in the Tillingbourne River at Abinger Hammer at Surrey, England. Invertebrates are living organisms without backbones therefore there must be a number of factors, which affect the way they live and reproduce. The distribution of an invertebrate is partially affected by its environment. I chose to observe which species of invertebrates lived in the middle and at the edge of the riverbed- the river being their habitat. I feel that the three most important abiotic factors that contribute to the distribution and abundance of such invertebrates are the flow rate i.e. the velocity of the water, the temperature and the oxygen levels. As well as measuring these three things I did a kick sampling to see which different species I would be able to find in the invertebrates' habitat- the river. There were also various safety measures we took such as wearing gloves and waterproof clothing to protect us from any harmful diseases. We were instructed to handle all equipment gently and accurately to ensure that the results are as accurate as possible. The weather that day was quite sunny that day, which was useful for us because the sunlight enabled us to see well. We took our edge sample from the left side of the river as well as our flow rate, dissolved oxygen and temperature levels. Our middle sample was taken from, you guessed it....the middle. Throughout the rest of this research you will find the results of my observations on the flow rate, oxygen levels and the different species of freshwater invertebrates that I found. Predictions: 1. The water velocity is going to be greater at the middle of the river. 2. The water temperature will be greater at the edge of the river. ...read more.

Middle

Animals that are adapted to living at the edge of the river are Springtails, they mainly feed on vegetation and therefore the edge of the river is more ideal for them rather than the middle. A problem with this result is that the middle section of the river may have been disturbed when someone may have walked through it forcing the invertebrates to flee to the edges, temporarily populating that area further. Detailed description of six different freshwater invertebrates I am now going to describe, in detail, five different species with their different adaptations that enable them to survive in the part of the river they live in. Each of the following inhabitants belongs to the population of other invertebrates like themselves. They live an ecosystem- the living organisms and the area they inhabitat as a whole. Water boatmen Water boatmen are insects that can be found in small rivers and streams. They prefer to live in rivers/ streams with a low water velocity because they are not well adapted enough to survive high currents; they are usually found on the surface of the river however, as they are good swimmers and land and river residing insects they can be found at either the edge of middle of the river. The results show that one was found at the middle and two at the edge, our group found one at the middle of the river, it may have been at the edge and moved or may have been swimming in search for food. They can live on land or in water making them amphibious. These aquatic bugs have paddle-like adaptations on their hind legs -which have stiff hairs that help them push against the water- that help them to swim quicker in a river. The one my group found in the Tillingbourne River was an exceptionally swift swimmer and was able to survive out of water when it jumped out of our tray before being caught. ...read more.

Conclusion

Some people may have felt that all the predictions/ hypotheses made were true and when they got their results they may have feared that they had the wrong results and so adjusted their results to their neighbours' or someone else's. Time was also an issue. I feel that we should've been given a longer period of time in which to measure the oxygen levels, velocity, and temperature of water as well as do the kick sampling. Our groups were small so we had to work economically and efficiently. This may have affected our results to an extent. The quality and accuracy of the observation is one of the things, which are not fully correct. As we are not professionals in river studies, many of our measurements and results are possibly incorrect. I am not entirely confident that the results achieved are highly reliable. The results depended on teamwork and a certain level of understanding in the subject matter. We all worked individually as well as in a team and if we were given the opportunity to do the research again I think that there would be a significant increase in the standard and quality of the work produced. Many of the anomalous results are due to the fact that as inexperienced freshwater ecologists we were more prone to make mistakes and the suitability of our methods were accurate enough for the research we performed but I feel that if we used more developed methods and machines to record our research. For instance, an Impellor that had its own timer, which started in accordance to when the propeller starts moving. And a machine, which gently goes in the water gently without contaminating the sample. The best solution for the prevention of the contamination of the results is for everybody to have a very big gap between them and another group. Furthermore, I think that by recording some of the other, slightly more detailed, abiotic factors we would be able to get a clearer perspective on things that affect the distribution and abundance of freshwater invertebrates in that ecosystem. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Hydrology & Fluvial Geomorphology 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 AS and A Level Hydrology & Fluvial Geomorphology essays

  1. 'To what extent does the River Lyn conform to the Bradshaw model of River ...

    I have collected data on the gradient, D90 bedload, cross sectional area, velocity, depth, width and the discharge in order to help me answer the title. For all of these I have collected the data and put it in the best possible form, e.g.

  2. Study the river Cray and see whether the river actually follows a natural path ...

    These are charts for difference in pebble shape. It tells us that the pebbles become more rounded and less angular from source to mouth These are graphs that show the cross section of the river at the source, mid-section and the mouth.

  1. Does the river Alyn follow Bradshaw's model?

    Methodology - Sampling Sampling is where you select and test part of an area as opposed to sampling the whole thing. Sampling is carried out to test ideas and see if theories are correct or to find out information for the first time so that theories can me made.

  2. Investigate how the velocity of rivers changes.

    * Measure the depths of the Left- bank, Mid-stream, and Right-bank at the start, middle, and finish of the stretch of river. * Record measurement in table of results. * 3 people enter the river at the beginning of the stretch and 3 people enter at the end of the stretch of river.

  1. Geograpgy glendun river

    We have chosen this river to study for the following reasons: * It is not too far from school and easily accessible * There is a road running parallel to the river which makes access easier as we were in a large group this was vital * The school has

  2. As a group we have decided to look at the changes in a river ...

    The source of a river is usually found in the hills or mountains. A river can have more than one source. The source is where a river begins its journey. * Tributary - A tributary is a stream or river flowing into a larger river.

  1. River Studies

    For example, for the Rio Lizandro, I predict that as the friction decreases as the river moves along its course, the average velocity and efficiency of the river will increase. This change in average velocity will cause the cross sectional area to increase, and so on.

  2. To assess whether the modified channel of the river ash is effective in reducing ...

    This would reduce the risk in flooding to local homes. Method We measured a distance of 5 m. using a 30 m. measuring tape and marked the distance with ranging poles resting on the surface of the water. We found a specific point on both poles and lined the clinometer up so it was level.

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