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

Investigating Population; Random sampling; what is transects? How does it work?

Extracts from this document...

Introduction

Investigating Population; Random sampling; what is transects? How does it work? A group of interbreeding organisms of one species in a habitat is referred to as a population. Investigating the population is part of ecology, which is the study of inter-relationships between organisms and their environment. Eventually, it is necessary to count the number of individuals of a species in a given habitat. However, it is impossible to count all the number of individuals of a species of given habitat because the process is time consuming and could cause damage to the habitat. To overcome these issues, random sampling using quadrates and systematic sampling along transects are used. Random sampling can be carried out by dividing the study into a grid of numbered lines, e.g. ...read more.

Middle

point quadrat - consists of a horizontal bar supported by two legs. A point frame consisting of a group of 10 pins set about 5 cm apart is normally used. The pins are lowered in turn and the number of hits and misses on the particular species of plant under consideration is recorded. 2. A frame quadrat - a square frame divided by string or wire into evenly sized sections. Altogether, both types of quadrates produce quantitative results. Systematic sampling along transects is more informative to measure the number of individuals of a species in a given space in a systematic rather than a random manner. ...read more.

Conclusion

{Figure 2 represents a frame quadrat}. Both the process involves reasons, such as chance affecting the sampling. Therefore the results may not be representative. For example, the 50 buttercup plants selected might just happen to be the tallest in the population. Even though we cannot remove chance from the sampling process completely, we can minimise the effect by using a large sample as well as analysis the data that is collected carefully. Using a large sample size will reduce the effect of chance; as more individuals are selected, the results are less deviating far from accurate mean value. at the same time, analysing the data collected carefully, which involve accepting that chance will play a part and using statistical tests to determine the extend to which chance may have influenced the data could also minimise the effect of chance. ...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 Energy, Respiration & the 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Fighter Pilot A Statistical Analysis of Reaction time and its Correlation with Dominant ...

    5 star(s)

    10 50 66 59 0.319 0.367 0.347 0.344 11 46 37 38 0.306 0.274 0.278 0.286 12 24 24 17 0.221 0.221 0.186 0.209 13 34 31 26 0.263 0.25 0.23 0.248 14 34 45 37 0.263 0.303 0.274 0.280 15 51 40 37 0.322 0.285 0.274 0.294 16 31

  2. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    The analysis of the T - Test shows us that there is a statistically significant difference between the sizes of limpets found on the upper shore and those found on an lower shore, as was originally stated in the hypothesis.

  1. Aspects of the Ecology of the Shingle beach at Greatstone

    It has sage-like creased leaves. However the wood sage has little value as an herb. Wood sage will compete better in full sun or light shade. Conclusion Dots and lines in the graph show that species were present in the given distance. The graph shows that False Oat Grass was very common from 19m to

  2. Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

    I will also make sure that I wear gloves protecting my hands from catching diseases. There are many diseases linked to unhygienic substances related to animals. Wearing gloves will not only affect my health, but also distort my results; our skins pH level is 5.5.

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