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Mark-Release-Recapture of Woodlice.

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Introduction

Mark-Release-Recapture of Woodlice Experiment Write Up Introduction: - Many living organisms can be sampled using static sampling techniques, but these techniques are not useful for mobile animals. A useful technique for mobile species is the 'Mark-release-recapture The mark-release-recapture technique (also known as the Lincoln Index) is used to arrive at estimates of the size of populations of mobile animals, like ground beetles and woodlice. An initial sample of the population in question is caught; its individuals are marked with a non-toxic paint, and then released back into the wild. Results would be recorded including, the amount first captured, painted, released. These marked individuals are allowed to become randomly dispersed throughout the population and then a second sample is taken. Its size and the number in it of marked, and hence recaptured, individuals are noted to determine the ratio of marked to unmarked individuals. From the size of the sample marked (n1), the total number in the second sample (n2), and the number of marked individuals recaptured in the second sample (m2), the size of the population (N) ...read more.

Middle

This allows all animals in the population to become equally trap-happy before you start * Trap-shyness results in population overestimates, while trap-happiness results in population underestimation. * The actual method used to investigate population size depends on whether you are measuring an open or closed population. A closed population means one in which you assume there is no immigration or emigration and no births or deaths. In practice, there are very few completely closed populations. This problem can be partially overcome by conducting the study over as short a period as possible and at a time when there are likely to be few changes in population size for any of the above reasons. * Closed population methods applied to an open population will produce biased results. * Open population methods produce less precise estimates of population size. (The Lincoln Index is a method which is used to estimate the size of closed populations) ...read more.

Conclusion

There are many important ways that this technique could be used in ecological research, for example it could be used to keep very important tabs on the population of certain species, or of a certain area. This could result in introducing predators if need be, to keep the population under control. The mark-release-recapture could also be used to basically investigate a certain species or an area, certain animals could be used as biological indicator but would show what sort of environment and atmosphere the species are living in. Conclusion: - The results show that 64 woodlice were caught painted and released back into the wilderness. On the second day 58 woodlice were recaptured and of those, 9 were painted. This meant that out of the 58 woodlice recaptured, 49 were not captured previously as only 9 were found painted. This meant that 55 of the woodlice first captured have dispersed amongst themselves, died or the paint could have washed off their backs, making them indifferent to the newly caught woodlice. Hema Kansara Mark-Release-Recapture of woodlice 1 ...read more.

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