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Fluctuations in the odonate (dragonfly) species composition in relation to anthropogenic modifications of the forest landscape
Halmstad University, School of Business, Engineering and Science.
2018 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The aim of the present study is to assess if the odonate species composition have transformed in relation to modifications in the forest landscapes of Norrbotten County since the mid 1900´s. In order to reach this aim, 19 grids (1x1 km) with documented odonate observations in Norrbotten County were chosen, and grid images of the 19 grids were analyzed and quantified using ten landscape variables. In order to analyze the changes over time, four time periods were selected and grids from other counties were chosen for simulated historic odonate compositions. The data was analysed using the statistical tests discriminant analysis and canonical correspondence analysis (CCA). Time period 4 (representing the years 2010-2018) stands out from the historic time periods in terms of species composition in relation to landscape development. Significant changes can be observed in number of forest fragments and in the abundance of three odonate species; Aeshna caerulea, Pyrrhosoma nymphula and Somatochlora alpestris. To conclude, the odonate compositions have changed in relation to anthropogenic changes, perhaps mainly because of lag effects (delayed effects caused by previous impacts) induced by climate changes, and not as a result of modified forest landscapes.

Place, publisher, year, edition, pages
2018.
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:hh:diva-38031OAI: oai:DiVA.org:hh-38031DiVA, id: diva2:1249928
Subject / course
Environmental Science
Educational program
Master's Programme in Applied Environmental Science
Supervisors
Examiners
Available from: 2018-09-28 Created: 2018-09-20 Last updated: 2018-09-28Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf