Irja Ida Ratikainen

Researcher / Ass. Prof. II

Department of Biology Faculty of Natural Sciences

Realfagbygget, E3-160, Gløshaugen, Høgskoleringen 5

About me

I am a researcher at the Centre for Biodiversity Dynamics (CBD) and I am part of the Behaviour and Evolution Research group at the department of Biology. I have a wide field of interest within behavioural and evolutionary ecology. You can read about my research group here.

I work both empirically and theoretically to answer questions about how organisms adapt to variable and unpredictable environments. When we improve our understanding of how animals and plants adapt to variable environments we will also be better able to predict how they will cope with a changing environment in the future.

I participate in the Outstanding Academic Fellows programme for talent and career development for your researchers at NTNU. I am also listed among NTNUs expert lists for journalists, and I am happy to answer questions from journalists or others.

Teaching

I am responsible for the course Biodiversity and conservation biology II (BI3082). If you have any questions regarding this course you are welcome to send me an email.

Scientific, academic and artistic work

A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database

Journal publications

Stokke, Bård Gunnar; Ratikainen, Irja Ida; Moksnes, Arne; Røskaft, Eivin; Schulze-Hagen, Karl; Leech, David I.; Møller, Anders pape; Fossøy, Frode. (2018) Characteristics determining host suitability for a generalist parasite. Scientific Reports. vol. 8.
Haaland, Thomas; Wright, Jonathan; Kuijper, Bram; Ratikainen, Irja Ida. (2017) Differential allocation revisited: When should mate quality affect parental investment?. American Naturalist. vol. 190 (4).
Aronsen, Tonje; Berglund, Anders; Mobley, Kenyon; Ratikainen, Irja Ida; Rosenqvist, Gunilla. (2013) Sex ratio and density affect sexual seleciton in a sex-role reversed fish. Evolution. vol. 67 (11).
Ratikainen, Irja Ida; Wright, Jonathan. (2013) Adaptive management of body mass by Siberian jays. Animal Behaviour. vol. 85 (2).
Ratikainen, Irja Ida; Sødal, Liv Randi Henøen; Kazem, Anahita J.N.; Wright, Jonathan. (2012) Private and public information use strategies by foraging groups of wild Siberian jays. Animal Behaviour. vol. 83 (5).
Delgado, Maria Del Mar; Ratikainen, Irja Ida; Kokko, Hanna. (2011) Inertia: the discrepancy between individual and common good in dispersal and prospecting behaviour. Biological Reviews. vol. 86 (3).
Delgado, Maria Del Mar; Ratikainen, Irja Ida; Kokko, Hanna. (2010) Inertia: the discrepancy between individual and common good in dispersal and prospecting behaviour. Biological Reviews.
Ratikainen, Irja Ida; Wright, Jonathan; Kazem, Anahita N.J.. (2010) Social class influences degree of variance sensitivity in wild Siberian jays. Behavioral Ecology. vol. 21 (5).
Ratikainen, Irja Ida; Gill, Jennifer A.; Gunnarsson, Tómas G.; Sutherland, W.J.; Kokko, Hanna. (2008) When density dependence is not instantaneous: theoretical developments and management implications. Ecology Letters. vol. 11.
Ratikainen, Irja Ida; Panzacchi, Manuela; Mysterud, Atle; Odden, John; Linnell, John D.C.; Andersen, Reidar. (2007) Use of winter habitat by roe deer at a northern latitude where Eurasian lynx are present. Journal of Zoology. vol. 273.

Part of book/report

Ratikainen, Irja Ida. (2017) biologisk klokke. Store norske leksikon (snl.no 2017).
Ratikainen, Irja Ida. (2017) cirkadisk rytme. Store norske leksikon (snl.no 2017).
Ratikainen, Irja Ida. (2015) Copes regel. Store norske leksikon (snl.no 2015).
Ratikainen, Irja Ida. (2014) proksimat forklaring. Store norske leksikon, snl.no (2014).
Ratikainen, Irja Ida. (2014) ultimat forklaring. Store norske leksikon, snl.no (2014).
Ratikainen, Irja Ida. (2013) artsdiversitet. Store norske leksikon (snl.no).
Ratikainen, Irja Ida. (2013) effektiv populasjonsstørrelse. Store norske leksikon (snl.no).
Ratikainen, Irja Ida; Kunnskapsforlaget, Store Norske Leksikon. (2013) biologisk mangfold. Store norske leksikon (snl.no).
Ratikainen, Irja Ida; Kunnskapsforlaget, Store Norske Leksikon. (2013) klimakssamfunn. Store norske leksikon (snl.no).

Report/dissertation

Ratikainen, Irja Ida; Wright, Jonathan; Kazem, Anahita N.J.. (2012) Foraging in a variable world. Adaptations to stochasticity. 2012.