Comparing Sampling and Measuring Techniques with Corophium volutator in the Mud Flats of Wolfville, Nova Scotia.
Cale Duffus; Student ID: 100116754
In the introduction of this paper, importance of sampling and precise measuring is discussed and how important it is to biology. The sample of this study is also presented in the introduction, describing some characteristics of the organism. As well our purposes and hypotheses are stated. On how the study was actually done is located in the methods section carefully instructed. The techniques used were with the sieve method and the opportunistic search. All significant values calculated are presented through 7 tables in the results section. A variety of statistical analysis was used, including means, variance, confidence limits and T-tests. It was found that there is a significant difference in calculated means from the sieve method and opportunistic method. It was also found that there is no significant difference in the measuring techniques involving in the field versus interprojected scope.
As biology being the study of all living things, it is crucial that sampling is done properly and
precise in order to study the population. Since every single organism in the population cannot be
captured, random samples of the population are taken and close and relevant values to the actual
population of the sample captured are used. This is called sampling, and with this, information of a
population which concerns its function, structure or even conservation work can be gathered. When
sampling, it is important that it is completely random and unbiased. This is because the values desired
are to reflect the whole population, and with a random sample representing the population this is more
attainable versus a biased sample (e.g. sampling an area where only larger mud shrimp supposedly
live). When measuring an organism, it is important that measuring is accurate and consistent, as this
will build a foundation of precise values for the population itself. In this study sampling was used in
order to determine mean body lengths of a population, and than compared the techniques that they were
measured with. The population that was sampled are the species Corophium volutator, or more
commonly known as mud shrimp. They have been given this name due to their living grounds, mud
flats of the northern Atlantic Ocean (Veronika Gerdol & R.G. Hughes, 1994). They are a species of
amphipod crustacean in the family Corophiidae (M.J. De Kluijver & S.S. Igalsuo, 1999). Their physical
description is simple, as they are whitish with brown markings and their heads bear two sets of
antennae, the first pair being small and point forwards, while the second set are much longer and
thicker (Ken Neal & Penny Avant, 2006). Before conducting this study, it was assumed that there is
no significant difference in the means calculated by using the sieve method or opportunistic sampling
method of sampling. As well it was assumed that there is no significant variation between the two
measuring techniques. The purpose of this study was to compare the effectiveness of two sampling
techniques in determining mean body length of the Corophium volutator population and to determine if
either technique shows sampling bias. Also, the other purpose of this study was to compare two
measuring techniques to see if one is more accurate than the other.
Materials & Methods
To perform the study on Corophium volutator, an accessible site extremely rich of
the sample was selected. This study area was a site in the mud flats in Wolfville (New Minas Basin),
Nova Scotia. Two collection techniques were used.
Firstly, the sieve method was used. To begin with this method, mud from the mud flats was
collected using a shovel. Only the first 2-3 inches from the surface of the mud was...
Please join StudyMode to read the full document