his.sePublications
910111213141512 of 15
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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
Konkurrensen mellan röding, sik och lake i Vättern: En djupdykning i tre konsumenters födopreferenser. Två tidsperioder: 1964-1978 samt 2006-2011
University of Skövde, School of Bioscience.
2020 (Swedish)Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesisAlternative title
Interspecific competition between arctic charr, whitefish and burbot in lake vättern : Analyzing data from two periods: 1964-1978 and 2006-2011 (English)
Abstract [en]

Lake Vättern contains Swedens most valuable population of arctic charr (Salvelinus umbla). The stock of this Salmonidae fish showed a negative trend for several decades but has now turned to a more positive one. Too minimize the risk of a new backlash it is important to obtain knowledge about the arctic charr and its interaction with other species. The purpose of this paper is to investigate the interspecific competition between arctic charr and two other valuable species i.e. whitefish (Coregonus maraena) and burbot (Lota lota). Data of stomach contents from two periods (1964-1978 & 2006-2011) were analyzed. The consumers were divided into different groups with respect to size and season. The measure of the competition was then answered quantitatively with two indexes (Pianka & Laubmeier). The results support the conclusion that small charr (<30 cm) was exposed of remarkably tough competition from whitefish regarding the older period. This derives from the fact that these two species show a very similar diet including Opossum shrimp (Mysis relicta) and Monoporeia affinis. With increasing size charr turns to a more piscivore diet and begins to compete with burbot. The piscivorous charr consumes mostly smelt (Osmerus eperlanus) while burbot shows a more diverse behavior of  its selection of fish species as a resource. The fact that these three species can coexist despite tough competition likely derives from the fact that Vätterns food web contains a lot of actors at the lower trophic levels.

Place, publisher, year, edition, pages
2020. , p. 30
National Category
Ecology
Identifiers
URN: urn:nbn:se:his:diva-18066OAI: oai:DiVA.org:his-18066DiVA, id: diva2:1383067
Educational program
Bioscience - Biological Resources and Sustainable Development
Supervisors
Examiners
Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07Bibliographically approved

Open Access in DiVA

fulltext(889 kB)21 downloads
File information
File name FULLTEXT01.pdfFile size 889 kBChecksum SHA-512
b97d224a9927fda5c84b926bc6880ba4ecc30547b6910352c75bedbbdb25be56ac2ffe13d6752dacc53584a495d1e524082a2ee934dce24e62b16ed7f93f1e4b
Type fulltextMimetype application/pdf

By organisation
School of Bioscience
Ecology

Search outside of DiVA

GoogleGoogle Scholar
Total: 21 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 59 hits
910111213141512 of 15
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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