uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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
The colour of noise matters for the response of a population to environmental change
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal Ecology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Recent models predict that the pattern of stochastic fluctuations (noise) matters for theevolutionary response to environmental change. In this study we test predictions from a recenttheoretical model in a laboratory experiment using the seed beetle Callosobruchus maculatus as amodel organism. Populations were exposed to different regimes of temperature increase; withoutnoise and with noise with no temporal autocorrelation (white noise) and very high temporalautocorrelation (red noise) over 18 generations. Developmental time decreased in the treatmentwith white noise fluctuation, but not in the treatment without noise or with red noise fluctuation,compared to the control lines. The main conclusions is, that the pattern of environmentalstochasticity is important for the evolutionary response of a population to a changing environmentas predicted by model simulations.

Keyword [en]
environmental noise, changing environment, life-history traits, seed beetle, empirical evidence
National Category
Evolutionary Biology
Research subject
Animal Ecology
Identifiers
URN: urn:nbn:se:uu:diva-159278OAI: oai:DiVA.org:uu-159278DiVA: diva2:443656
Available from: 2011-09-26 Created: 2011-09-26 Last updated: 2011-11-04
In thesis
1. Quantitative Trait Evolution in a Changing Environment in a Seed Beetle
Open this publication in new window or tab >>Quantitative Trait Evolution in a Changing Environment in a Seed Beetle
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During the last decades the climate has been changing more rapidly than in the preceding periods. This is for instance characterized by an increase in temperature. Interestingly, such changes in the environment are not necessarily constant over time as they often show high levels of fluctuation. Organisms are exposed to these changes and respond to them and a recent theoretical model predicts that fluctuations in the environment are important for populations’ response to climate change. The aim of this thesis is to investigate how populations respond to a changing environment, including fluctuations. My thesis is based on the previously mentioned theoretical model and I used a suite of laboratory experiments on the seed beetle Callsosobruchus maculatus, to test the model predictions in a quantitative genetic framework. First, I assessed the genetic architecture of several life history and morphological traits in order to verify that there is sufficient additive genetic variation for the population to respond to changes in the environment. Second, I tested the detailed model predictions explicitly, by investigating whether different types of environmental fluctuations matter for a population’s response. Third, I investigated changes in quantitative genetic variation after i) a rapid shift in temperature and ii) long term selection under increasing temperature including fluctuations. Fourth, I concentrated on sex differences in response to temperature, and finally, I assessed the relative importance of genetic and nongenetic inheritance for traits that differ in their plastic response to a change in the environment. I found that environmental fluctuations are highly important for a population’s response to environmental change. I could detect changes in a set of quantitative genetic parameters, suggesting that a population’s potential to respond to selection, environmental sensitivity and the evolution of phenotypic plasticity are affected by the selective past. I also found that sexes differ in additive genetic variation and plasticity and that parental effects may play an important role in the evolutionary process. Therefore, future studies would benefit greatly from considering details of the selective past and especially environmental fluctuations during attempts to predict how populations respond to a changing environment, particularly with regards to climate change.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 40 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 858
Keyword
quantitative trait, genetic variance, environmental change, temperature, seed beetle, sexual dimorphism, plasticity, inheritance
National Category
Evolutionary Biology
Research subject
Animal Ecology
Identifiers
urn:nbn:se:uu:diva-159284 (URN)978-91-554-8169-8 (ISBN)
Public defence
2011-11-12, Zootissalen, EBC, Villavägen 9, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2011-10-20 Created: 2011-09-26 Last updated: 2011-11-04Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Hallsson, Lára R.

Search in DiVA

By author/editor
Hallsson, Lára R.
By organisation
Animal Ecology
Evolutionary Biology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 370 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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