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Structural variation across food webs as a measure of biodiversity at the ecosystem level
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesisAlternative title
Variation i struktur hos näringsvävar som ett mått för biodiversitet på ekosystemsnivå (Swedish)
Abstract [en]

Biodiversity can be measured in several ways and on several levels. In this study a framework is developed to use topological differences in the food webs describing ecosystems to quantify differences between ecosystems. This is then used in an attempt to describe biodiversity at the ecosystem level. Empirical food webs were analysed to find out if distance between systems in a multidimensional space where network characteristics are used as axes can be used to give an indication of variation among the systems. To test if some class of systems is more varied the systems were classified in several ways, according to type of system, location of system and size of the food web describing the system. Among the analysed systems some classes had a larger proportion of large distances, which indicates that there were more dissimilar systems within those classes. The classes showing larger variation were lakes, freshwater systems, temperate systems and systems with a larger number of nodes.

Place, publisher, year, edition, pages
2013. , 27 p.
Keyword [en]
Biodiversity, Euclidian distance, Food webs, Network characteristics
National Category
URN: urn:nbn:se:liu:diva-94617ISRN: LiTH-IFM- Ex--13/2785--SEOAI: diva2:633580
Subject / course
2013-05-30, Linköping, 11:40 (Swedish)
Available from: 2013-06-27 Created: 2013-06-27 Last updated: 2013-06-27Bibliographically approved

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Department of Physics, Chemistry and BiologyThe Institute of Technology

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