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Population demography’s potential effect on stoichiometry: Assessing the growth rate hypothesis with demography
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
Abstract [en]

The elemental composition within structured insect populations was tested by creating a new method to analyze how variables (survival, growth and fecundity) within a population matrix could potentially affect the stoichiometric regime of a structured population at steady state. This was done by focusing on if the growth rate hypothesis, which states that there is a linear relationship between an individual growth rate and the percent of phosphorus within the individual, works at a population level. This was analyzed by creating and combining two matrices: the matrix-population containing the variables and a matrix containing the element phosphorus and dry weight. Data from a beetle species, Chrysomela tremulae F., was used as a guideline to create eight stoichiometric generic populations, where survival, growth and fecundity were tested in each of the eight generic populations. The results showed deviations from the growth rate hypothesis, suggesting that the hypothesis does not always work within structured populations. However, more research is needed to predict exactly how this hypothesis works in populations. Overall, this new method for analyzing stoichiometry within structured populations is a useful analytical tool, but there is a need for analyzing the results from these models in a more efficient way.

Place, publisher, year, edition, pages
2017. , 23 p.
Keyword [en]
Demography, insect populations, stoichiometry, growth rate hypothesis
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-130908OAI: oai:DiVA.org:umu-130908DiVA: diva2:1070294
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Available from: 2017-02-01 Created: 2017-02-01Bibliographically approved

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Department of Ecology and Environmental Sciences
Ecology

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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