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Är den starkt växande vildsvinspopulationen ett hot mot tjäderns reden?
Södertörn University College, School of Life Sciences.
2009 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This case study is based on a previous documented method of manufacturing artificial nest containing pre-colored hen eggs. This method is going to be used to find, if the wild boar population, which is growing in number, is a threat to the capercaillie population.  In comparison to the wild boar population, the capercaillie population is diminishing in different parts of Sweden.  In order to find out if they are affect by each other, the case study was carried out during the months of April to May 2009. 100 artificial nests were placed out on various locations on the Södertuna estate just in the outskirts of Gnesta. The unique aspect of this study is that a fenced environment to keep out wild animals is used to conduct this study, which has been previously known to be free from wild boar, but the area outside has sittings of wild boar. So to fully understand how this affects the capercaillie population, 50 of the nests were placed outside the fence area, while the other 50 nests were placed inside the fenced area. The sites were visited on two separate occasions, and were noted of the changes inside and outside the fenced compounds. The result of these visits show that many of the nests inside the fenced environment has been consume by birds. It was not possible to prove that nests have been predated by wild boar, even the wild boar populations could be found outside of the fenced area. The statistical analysis has been carried out to determine the perdition rate on the nests and which of the two main groups the culprits belonged to. The significant difference came to a P <0.05. The predations on the artificial nests inside the fence were greater than the nest placed outside the fence. The total came to a 20 %, i.e. 20 of the 100 nests which were predated on, in total. 32%, i.e. 16 of the nests were attacked that were placed inside the fence and 8 %, i.e. 4 were attacked inside the fence. To observe closer at the species that targeted the nests inside the fence were crows/eurasian jay 18 % (9), badgers/fox 14 % (7) and wild boar 0 %. Outside the fence, the results were divided into division on crows/eurasian jay 2 % (1), badgers/fox 6 % (3) and wild boar 0 %. This study shows the wild boar population does not the pose a threat to the swindling population of the capercaillies population. But this case study demonstrates that there are other species that create a threat to the simulated nests, which is of an utter most importance to research into this particular subject into the future on reproduced artificial nests to investigate the perdition rates of capercaillies.

Place, publisher, year, edition, pages
2009. , 19 p.
Keyword [sv]
tjäder, tjäderrede, vildsvin, predation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-3161OAI: oai:DiVA.org:sh-3161DiVA: diva2:291663
Presentation
(English)
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2010-02-03 Created: 2010-02-02 Last updated: 2010-02-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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