Irja Ida Ratikainen
About
About me
I am a researcher at The Gjærevoll Centre - A Centre for Biodiversity Foresight Analysis. I have a wide field of interest within biodiversity, life history, behavioural and evolutionary ecology.
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.
Publications
2025
-
Martinossi-Allibert, Ivain;
Ratikainen, Irja Ida;
Albretsen, Jon;
Eknes, Eirin Jetmundsen;
Ellingsen, Ingrid Helene;
Estalella, Claudia Aparicio.
(2025)
Meeting the challenge of latitude: a climatic gradient shapes the reproductive strategy of a nest-brooding marine fish.
Marine Ecology Progress Series
Academic article
-
Sekajova, Zuzana;
Fossen, Erlend Ignacio Fleck;
Rosa, Elena;
Ratikainen, Irja Ida;
Tourniaire-blum, Manon;
Lind, Martin.
(2025)
Evolution of phenotypic plasticity during environmental fluctuations.
Journal of Evolutionary Biology
Academic article
2024
-
Reitan, Berit;
Ratikainen, Irja Ida;
Bungum, Berit.
(2024)
Bruk av årshjul som modell for å utforske dyrs tilpasninger til klimaendringer.
Naturfag
Popular scientific article
-
Hjermann, Tilde Katrina Slotte;
Herfindal, Ivar;
Ratikainen, Irja Ida;
Strand, Olav;
Rauset, Geir Rune.
(2024)
Individual and temporal variation in movement patterns of wild alpine reindeer and implications for disease management.
Ecography
Academic article
2023
-
Auge, Gabriela;
Hankofer, Valentin;
Groth, Martin;
Antoniou-Kourounioti, Rea;
Ratikainen, Irja Ida;
Lampei, Christian.
(2023)
Plant environmental memory: implications, mechanisms and opportunities for plant scientists and beyond.
AoB Plants
Academic literature review
-
Fjelldal, Mari Aas;
Muller, Amandine Sophie;
Ratikainen, Irja Ida;
Stawski, Clare;
Wright, Jonathan.
(2023)
The small-bat-in-summer paradigm: Energetics and adaptive behavioural routines of bats investigated through a stochastic dynamic model.
Journal of Animal Ecology
Academic article
-
Sekajova, Zuzana;
Fossen, Erlend Ignacio Fleck;
Rosa, Elena;
Ratikainen, Irja Ida;
Tourniaire-blum, Manon;
Bolund, Elisabeth.
(2023)
Evolution during uncorrelated environmental fluctuations: bet-hedging or phenotypic plasticity?.
BioRxiv
Academic article
2022
-
Burton, Tim;
Ratikainen, Irja Ida;
Einum, Sigurd.
(2022)
Environmental change and the rate of phenotypic plasticity.
Global Change Biology
Academic article
2021
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2021)
Individual reversible plasticity as a genotype-level bet-hedging strategy.
Journal of Evolutionary Biology
Academic article
-
Hjermann, Tilde;
Ratikainen, Irja Ida;
Herfindal, Ivar;
Rauset, Geir Rune.
(2021)
Sex-specific space use patterns in wild alpine reindeer: potential consequences for disease transmission.
Norges teknisk-naturvitenskapelige universitet
Norges teknisk-naturvitenskapelige universitet
Masters thesis
2020
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2020)
Generalists versus specialists in fluctuating environments: a bet-hedging perspective.
Oikos
Academic article
2019
-
Ratikainen, Irja Ida;
Kokko, Hanna.
(2019)
The coevolution of lifespan and reversible plasticity.
Nature Communications
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2019)
Bet-hedging across generations can affect the evolution of variance-sensitive strategies within generations.
Proceedings of the Royal Society of London. Biological Sciences
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Tufto, Jarle;
Ratikainen, Irja Ida.
(2019)
Short‐term insurance versus long‐term bet‐hedging strategies as adaptations to variable environments.
Evolution
Academic article
-
Einum, Sigurd;
Ratikainen, Irja Ida;
Wright, Jonathan;
Pelabon, Christophe;
Bech, Claus;
Jutfelt, Fredrik.
(2019)
How to quantify thermal acclimation capacity?.
Global Change Biology
Academic article
2018
-
Ratikainen, Irja Ida;
Haaland, Thomas;
Wright, Jonathan.
(2018)
Differential allocation of parental investment and the trade-off between size and number of offspring.
Proceedings of the Royal Society of London. Biological Sciences
Academic article
-
Stokke, Bård Gunnar;
Ratikainen, Irja Ida;
Moksnes, Arne;
Røskaft, Eivin;
Schulze-Hagen, Karl;
Leech, David I..
(2018)
Characteristics determining host suitability for a generalist parasite.
Scientific Reports
Academic article
-
Govaert, Lynn;
Fronhofer, Emanuel A.;
Lion, Sébastien;
Eizaguirre, Christophe;
Bonte, Dries;
Egas, Martijn.
(2018)
Eco-evolutionary feedbacks - theoretical models and perspectives.
Functional Ecology
Academic article
2017
-
Haaland, Thomas;
Wright, Jonathan;
Kuijper, Bram;
Ratikainen, Irja Ida.
(2017)
Differential allocation revisited: When should mate quality affect parental investment?.
The American Naturalist
Academic article
2013
-
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
Academic article
-
Ratikainen, Irja Ida;
Wright, Jonathan.
(2013)
Adaptive management of body mass by Siberian jays.
Animal Behaviour
Academic article
2012
-
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
Academic article
2011
-
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
Academic article
2010
-
Ratikainen, Irja Ida;
Kokko, Hanna.
(2010)
Differential allocation and compensation: who deserves the silver spoon?.
Behavioral Ecology
Editorial
-
Ratikainen, Irja Ida;
Wright, Jonathan;
Kazem, Anahita N.J..
(2010)
Social class influences degree of variance sensitivity in wild Siberian jays.
Behavioral Ecology
Academic article
-
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
Academic literature review
2008
-
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
Academic literature review
2007
-
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
Academic article
Journal publications
-
Martinossi-Allibert, Ivain;
Ratikainen, Irja Ida;
Albretsen, Jon;
Eknes, Eirin Jetmundsen;
Ellingsen, Ingrid Helene;
Estalella, Claudia Aparicio.
(2025)
Meeting the challenge of latitude: a climatic gradient shapes the reproductive strategy of a nest-brooding marine fish.
Marine Ecology Progress Series
Academic article
-
Sekajova, Zuzana;
Fossen, Erlend Ignacio Fleck;
Rosa, Elena;
Ratikainen, Irja Ida;
Tourniaire-blum, Manon;
Lind, Martin.
(2025)
Evolution of phenotypic plasticity during environmental fluctuations.
Journal of Evolutionary Biology
Academic article
-
Reitan, Berit;
Ratikainen, Irja Ida;
Bungum, Berit.
(2024)
Bruk av årshjul som modell for å utforske dyrs tilpasninger til klimaendringer.
Naturfag
Popular scientific article
-
Hjermann, Tilde Katrina Slotte;
Herfindal, Ivar;
Ratikainen, Irja Ida;
Strand, Olav;
Rauset, Geir Rune.
(2024)
Individual and temporal variation in movement patterns of wild alpine reindeer and implications for disease management.
Ecography
Academic article
-
Auge, Gabriela;
Hankofer, Valentin;
Groth, Martin;
Antoniou-Kourounioti, Rea;
Ratikainen, Irja Ida;
Lampei, Christian.
(2023)
Plant environmental memory: implications, mechanisms and opportunities for plant scientists and beyond.
AoB Plants
Academic literature review
-
Fjelldal, Mari Aas;
Muller, Amandine Sophie;
Ratikainen, Irja Ida;
Stawski, Clare;
Wright, Jonathan.
(2023)
The small-bat-in-summer paradigm: Energetics and adaptive behavioural routines of bats investigated through a stochastic dynamic model.
Journal of Animal Ecology
Academic article
-
Sekajova, Zuzana;
Fossen, Erlend Ignacio Fleck;
Rosa, Elena;
Ratikainen, Irja Ida;
Tourniaire-blum, Manon;
Bolund, Elisabeth.
(2023)
Evolution during uncorrelated environmental fluctuations: bet-hedging or phenotypic plasticity?.
BioRxiv
Academic article
-
Burton, Tim;
Ratikainen, Irja Ida;
Einum, Sigurd.
(2022)
Environmental change and the rate of phenotypic plasticity.
Global Change Biology
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2021)
Individual reversible plasticity as a genotype-level bet-hedging strategy.
Journal of Evolutionary Biology
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2020)
Generalists versus specialists in fluctuating environments: a bet-hedging perspective.
Oikos
Academic article
-
Ratikainen, Irja Ida;
Kokko, Hanna.
(2019)
The coevolution of lifespan and reversible plasticity.
Nature Communications
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Ratikainen, Irja Ida.
(2019)
Bet-hedging across generations can affect the evolution of variance-sensitive strategies within generations.
Proceedings of the Royal Society of London. Biological Sciences
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Tufto, Jarle;
Ratikainen, Irja Ida.
(2019)
Short‐term insurance versus long‐term bet‐hedging strategies as adaptations to variable environments.
Evolution
Academic article
-
Einum, Sigurd;
Ratikainen, Irja Ida;
Wright, Jonathan;
Pelabon, Christophe;
Bech, Claus;
Jutfelt, Fredrik.
(2019)
How to quantify thermal acclimation capacity?.
Global Change Biology
Academic article
-
Ratikainen, Irja Ida;
Haaland, Thomas;
Wright, Jonathan.
(2018)
Differential allocation of parental investment and the trade-off between size and number of offspring.
Proceedings of the Royal Society of London. Biological Sciences
Academic article
-
Stokke, Bård Gunnar;
Ratikainen, Irja Ida;
Moksnes, Arne;
Røskaft, Eivin;
Schulze-Hagen, Karl;
Leech, David I..
(2018)
Characteristics determining host suitability for a generalist parasite.
Scientific Reports
Academic article
-
Govaert, Lynn;
Fronhofer, Emanuel A.;
Lion, Sébastien;
Eizaguirre, Christophe;
Bonte, Dries;
Egas, Martijn.
(2018)
Eco-evolutionary feedbacks - theoretical models and perspectives.
Functional Ecology
Academic article
-
Haaland, Thomas;
Wright, Jonathan;
Kuijper, Bram;
Ratikainen, Irja Ida.
(2017)
Differential allocation revisited: When should mate quality affect parental investment?.
The American Naturalist
Academic article
-
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
Academic article
-
Ratikainen, Irja Ida;
Wright, Jonathan.
(2013)
Adaptive management of body mass by Siberian jays.
Animal Behaviour
Academic article
-
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
Academic article
-
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
Academic article
-
Ratikainen, Irja Ida;
Kokko, Hanna.
(2010)
Differential allocation and compensation: who deserves the silver spoon?.
Behavioral Ecology
Editorial
-
Ratikainen, Irja Ida;
Wright, Jonathan;
Kazem, Anahita N.J..
(2010)
Social class influences degree of variance sensitivity in wild Siberian jays.
Behavioral Ecology
Academic article
-
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
Academic literature review
-
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
Academic literature review
-
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
Academic article
Report
-
Hjermann, Tilde;
Ratikainen, Irja Ida;
Herfindal, Ivar;
Rauset, Geir Rune.
(2021)
Sex-specific space use patterns in wild alpine reindeer: potential consequences for disease transmission.
Norges teknisk-naturvitenskapelige universitet
Norges teknisk-naturvitenskapelige universitet
Masters thesis
Outreach
2026
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PosterSolvåg, Christianne Dalsbotten; Krogstie, Hanne Bjørnås; Finstad, Anders Gravbrøt; Ratikainen, Irja Ida. (2026) Er det ein fugl? Er det eit fly? Nei, det er eit akvatisk insekt. Gjærevollkonferansen 2026: Norsk natur i 2050 , Trondheim 14.01.2026 - 15.01.2026
2025
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Academic lectureFjelldal, Mari Aas; Ratikainen, Irja Ida; Eldegard, Katrine; Lilley, Thomas. (2025) Conference presentation: The small-bat-in-autumn - simulating prehibernation fattening in bats across latitudes. The 20th International Bat Research Conference , Cairns 07.08.2025 -
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InterviewBrandslet, Steinar; Ratikainen, Irja Ida. (2025) Nei, grevlingen biter ikke til det knaser. Gemini Gemini [Internet] 26.09.2025
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InterviewAas, Vilde Aardahl; Ratikainen, Irja Ida. (2025) Vinteren blir kortere: – Dyrene forstår ikke helt hva som skjer. https://ung.forskning.no/ https://ung.forskning.no/ [Internet] 19.01.2025
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InterviewGuttormsgaard, Hanna Enger; Ratikainen, Irja Ida. (2025) Dyr blir forvirra av klimaendringene. Norge i dag, NRK Norge i dag, NRK [TV] 18.02.2025
2024
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LectureAlterskjær, Kari; Ratikainen, Irja Ida. (2024) Blir vinteren kortere, og hvilken betydning har det for dyrelivet?. Realfagkonferansen 2024 , Trondheim 07.05.2024 - 07.05.2024
2023
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Academic lectureHaaland, Thomas Ray; Payo-Payo, Ana; Acker, Paul; Fortuna, Rita; Burthe, Sarah J.; Ratikainen, Irja Ida. (2023) Eco-evolutionary dynamics of partially migratory metapopulations. BOU 2023 , Nottingham, UK 04.04.2023 - 06.04.2023
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Academic lectureHaaland, Thomas Ray; Payo-Payo, Ana; Acker, Paul; Fortuna, Rita; Burthe, Sarah J; Ratikainen, Irja Ida. (2023) Eco-evolutionary dynamics of partially migratory metapopulations. Oikos Norway 2023 , NMBU, Ås 13.02.2023 - 15.02.2023
2022
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PosterHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2022) Individual reversible plasticity as a genotype-level bet-hedging strategy. ESEB 2022 , Praha 14.08.2022 - 19.08.2022
2020
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PosterGavriilidi, Ioanna Aikaterini; Ratikainen, Irja Ida; Norgaard, Trygve; Amundsen, Trond. (2020) Quality housing overruns costs of competition: a study of two-spotted gobies. 8th International Goby Meeting , Starnberg 26.02.2020 - 28.02.2020
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Academic lectureRatikainen, Irja Ida. (2020) The effect of environmental stochasticity on the outcome of evolution. Growth of Evolutionary Thought , Munster 07.12.2020 -
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Academic lectureRatikainen, Irja Ida; Kokko, Hanna; Lind, Martin; Haaland, Thomas; Silva, Willian. (2020) Lifespan and co-evolution with other life history traits in variable environments. PhD Summer School ADABT 2020: a summer school for FOR2281 , Karlsrhue 09.06.2020 -
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Academic lectureHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2020) Phenotypic plasticity as a bet-hedging strategy. EvoDemo , Røros 06.10.2020 - 11.10.2020
2019
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LectureRatikainen, Irja Ida. (2019) Biodiversity, climate change and migration. ISFiT 2019 workshop , Trondheim 06.02.2019 - 18.02.2019
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Academic lectureHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2019) Bet-hedging affects the evolution of variance-sensitive strategies. ASAB Summer 2019 , Konstanz 26.08.2019 - 28.08.2019
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PosterHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2019) Bet-hedging affects the evolution of variance-sensitive strategies. ESEB 2019 , Turku 19.08.2019 - 24.08.2019
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PosterHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2019) Bet-hedging affects the evolution of variance-sensitive strategies. Modelling Ecology and Evolution in Zürich , Zürich 24.06.2019 - 25.06.2019
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Academic lectureRatikainen, Irja Ida. (2019) Co-evolution of life history traits in variable environments. ESEB conference 2019 , Turku 19.08.2019 - 24.08.2019
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Academic lectureRatikainen, Irja Ida. (2019) Partner quality effects on optimal parental investments. Departmental seminar , Bergen 08.01.2019 -
2018
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Academic lectureGavriilidi, Ioanna Aikaterini; Ratikainen, Irja Ida; Amundsen, Trond. (2018) Territorial behaviour and competition in the two-spotted goby (Gobiusculus flavescens). Workshop "Interplay Between Parental Care and Sexual Selection" , Fiskebäckskil (SLC Kristineberg) 26.02.2018 - 03.03.2018
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Academic lectureRatikainen, Irja Ida. (2018) Why behavioural ecology is important for evolutionary ecologists. Visit to UiB 31.08.2018 -
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PosterRatikainen, Irja Ida; Kokko, Hanna. (2018) The coevolution of lifespan and reversible plasticity. Evolution 2018 19.08.2018 - 22.08.2018
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PosterHaaland, Thomas; Wright, Jonathan; Tufto, Jarle; Ratikainen, Irja Ida. (2018) Variable environments and the evolution of bet-hedgers, generalists and specialists. Evolution 2018 , Montpellier 18.08.2018 - 22.08.2018
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Academic lectureBotero, Carlos A.; Haaland, Thomas; Ratikainen, Irja Ida; Wright, Jonathan. (2018) Life history determines vulnerability and capacity to adapt to more frequent and intense extreme weather events. Evolution 2018 , Montpellier 18.08.2018 - 22.08.2018
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Academic lectureRatikainen, Irja Ida. (2018) Models of parental investment when mate quality varies. Interplay between sexual selection and parental care , Kristineberg 26.02.2018 - 03.03.2018
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Academic lectureHaaland, Thomas; Wright, Jonathan; Tufto, Jarle; Ratikainen, Irja Ida. (2018) Variable environments and the evolution of bet-hedgers, generalists and specialists. OIKOS 2018 , Trondheim 19.02.2018 - 22.02.2018
2017
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Academic lectureHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2017) Social decision making in a fluctuating world: A simulation model of a Producer-Scrounger foraging game. NØF 2017 , Oslo 11.01.2017 - 13.01.2017
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Academic lectureHaaland, Thomas; Wright, Jonathan; Tufto, Jarle; Botero, Carlos A.; Ratikainen, Irja Ida. (2017) Adaptations to uncertainty: Asymmetric fitness functions and fluctuating environments. ESEB 2017 , Groningen 20.08.2017 - 25.08.2017
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Academic lectureRatikainen, Irja Ida; Haaland, Thomas; Wright, Jonathan. (2017) Partner quality effects on optimal parental investment. Departmental seminar 11.05.2017 -
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PosterRatikainen, Irja Ida; Wright, Jonathan; Tufto, Jarle; Botero, Carlos A.. (2017) A simulation model of the evolution of transgenerational plasticity in fluctuating environments. ESEB 2017 , Groningen 20.08.2017 - 25.08.2017
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InterviewRatikainen, Irja Ida. (2017) Vår oppmerksomhet påvirker hunders ansiktsuttrykk. www.abcnyheter.no www.abcnyheter.no [Internet] 29.10.2017
2016
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InterviewRatikainen, Irja Ida; Grosvold, Roger. (2016) Slik kan Trofast finne veien hjem uten GPS. abc nyheter abc nyheter [Internet] 20.05.2016
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Academic lectureRatikainen, Irja Ida; Haaland, Thomas; Wright, Jonathan. (2016) Differential parental allocation to offspring size vs number. ISBE 2016 , Exeter 28.07.2016 - 03.08.2016
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LectureRatikainen, Irja Ida. (2016) Hva dyrene gjør og bør gjøre når verden rundt dem er mer eller mindre uforutsigbar. fagdag i Foreningen Norske Etologer , Trondheim 12.03.2016 -
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Academic lectureHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2016) A General Stochastic Dynamic Model of the Differential Allocation Hypothesis. ISBE2016 , University of Exeter 28.07.2016 - 03.08.2016
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Academic lectureHaaland, Thomas; Wright, Jonathan; Ratikainen, Irja Ida. (2016) Differential Allocation - A New Theoretical Framework. EMPSEB22 - European Meeting of PhD Students in Evolutionary Biology , Gotland 11.09.2016 - 16.09.2016
2015
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Academic lectureRatikainen, Irja Ida; Haaland, Thomas Ray; Wright, Jonathan. (2015) A general stochastic dynamic model of the differential allocation hypothesis. Mathematical Models in Ecology and Evolution 2015 , Paris 07.07.2015 - 11.07.2015
2014
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Academic lectureRatikainen, Irja Ida; Wright, Jonathan. (2014) Adaptations to stochasticity at multiple levels. CBD Workshop on 'Evolution in Stochastic Environments' , Trondheim 13.01.2014 - 15.01.2014
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Academic lectureRatikainen, Irja Ida; Wright, Jonathan. (2014) Variance sensitivity and other adaptations to variable environments. Visit to the "Modeling Animal Decisions" group 20.10.2014 - 22.10.2014
2012
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PosterRatikainen, Irja Ida; Wright, Jonathan. (2012) Adaptive Management of Individual Body Mass in Wild Groups of Siberian Jays. 14th Congress of the International Society for Behavioral Ecology , University of Lund 12.08.2012 - 18.08.2012
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Academic lectureWright, Jonathan; Ratikainen, Irja Ida. (2012) Adaptations to Environmental Stochasticity. Departmental Seminar , Department of Biology, University of Jerusalem 06.11.2012 - 06.11.2012
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Academic lectureWright, Jonathan; Ratikainen, Irja Ida. (2012) Adaptations to Environmental Stochasticity. Departmental Seminar , University of Haifa 24.10.2012 - 24.10.2012
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Academic lectureWright, Jonathan; Ratikainen, Irja Ida. (2012) Adaptive Responses to Environmental Stochasticity. Departmental Seminar , University of Bern 25.04.2012 - 25.04.2012
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Academic lectureWright, Jonathan; Ratikainen, Irja Ida. (2012) Adaptive Responses to Environmental Stochasticity. 14th Congress of the International Society for Behavioral Ecology , University of Lund 12.08.2012 - 18.08.2012
2010
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Academic lectureRatikainen, Irja Ida; Sødal, Liv Randi Henøen; Wright, Jonathan; Kazem, Anahita J.N.. (2010) Optimal sampling, private and public information use in foraging by wild Siberian Jays. ISBE 2010 , Perth 26.09.2010 - 02.10.2010
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PosterRatikainen, Irja Ida; Kokko, Hanna. (2010) POPULATION CONSEQUENCES OF PROSPECTING BEHAVIOUR. CCB 2010 Sustainable conservation , Trondheim 15.03.2010 - 18.03.2010
2008
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Academic lectureRatikainen, Irja Ida; Wright, Jonathan; Kazem, Anahita N.J.. (2008) Social class influences variance-sensitivity in wild Siberian jays: gambling to survive vs to reproduce?. ISBE (12th congress of the International Society for Behavioral Ecology) , Cornell University 09.08.2008 - 15.08.2008
2007
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PosterRatikainen, Irja Ida; Kokko, Hanna. (2007) Possible population consequences of evolution of prospecting behaviour. ESEB (The 11th Congress of The European Society for Evolutionary Biology) 20.08.2007 - 25.08.2007
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LectureRatikainen, Irja Ida; Grønningsæter, Eirik. (2007) Lavskrika - Nepotisten i gammelskogen. foredrag i NOF , Suhmhust, Trondheim 06.11.2007 - 06.11.2007