Suelmann, Monique (2021) Spiders in the city. Research Project, Science Education and Communication.
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MSuelmann_S2833778_Spidersinthecity.pdf Download (997kB) | Preview |
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Appendix A - Actograms timing trial 1.pdf Download (107kB) | Preview |
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Appendix B - Actograms timing trial 2.pdf Download (250kB) | Preview |
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Appendix C - Exclusion numbers.pdf Download (101kB) | Preview |
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Appendix D - Actograms Tau Trial 1.pdf Download (229kB) | Preview |
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Appendix E - Actograms Tau Trial 2.pdf Download (616kB) | Preview |
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Appendix F - Onset, CoG, offset and Tau values for trial 1 and 2.pdf Download (150kB) | Preview |
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Appendix G - lab book.pdf Download (1MB) | Preview |
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Abstract
Artificial light at night (ALAN) is one of the features of urbanization and can interfere with circadian clocks and timings of organisms. This can cause problems in various organisms. However, some species seem to thrive well in urban areas and it is not well known why or how these species thrive so well in urban areas. Two of these species are the nocturnal orbweavers Zygiella x-notata and Larinioides sclopetarius and are taken in this research as a model species. To determine timing, circadian rhythmicity, and the possible correlation between the two, locomotor activity was monitored. To determine the timing, different phase markers were calculated based on locomotor activity in light: dark cycles. To determine circadian rhythmicity, the free-running period was measured and expressed in terms of Tau. A regression analysis for Zygiella x-notata was performed for onset with tau. Zygiella x-notata had a relatively early onset of activity compared to Larinioides sclopetarius. Tau was notably longer for Larinioides sclopetarius (mean 26.17 h, N=2) than for Zygiella x-notata (mean 23.06 h, N=9). Furthermore, the results from this research point to a relationship between timing and the free-running period. This could mean that there is a genetic component in circadian timing. However, more research should be done before it can be concluded that there has been genetic adaptations in the populations where the tested spiders were offspring off.
| Item Type: | Thesis (Research Project) |
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| Supervisor name: | Maan, M.E. and Helm, B. |
| Degree programme: | Science Education and Communication |
| Thesis type: | Research Project |
| Language: | English |
| Date Deposited: | 09 Apr 2021 14:46 |
| Last Modified: | 09 Apr 2021 14:46 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/24230 |
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