
Professor Christos Ioannou
BSc(U.C.Lond.), PhD(Leeds)
Expertise
Our research focuses on collective behaviour, how this is shaped by predation and the environment, mostly in fish as prey and/or predators.
Current positions
Professor of Behavioural Ecology
School of Biological Sciences
Contact
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Biography
As with most researchers I have been heavily shaped by the research groups I’ve been lucky enough to work in. Doing my PhD with Prof. Jens Krause at the University of Leeds (Jens is now back in Berlin, at the Leibniz Institute) was a great training in how to design and carry out behavioural experiments with fish, write papers, and think like a behavioural ecologist. It was where I fell in love with fish! Importantly, I had freedom to pursue my own research interests and develop my own style of experiment (as well as make loads of my own mistakes).
Moving on to Prof. Iain Couzin’s lab at Princeton University as a postdoc was quite a change, with most of the lab members there being mathematically and computationally focused. This was great for me as I had enjoyed working with such folks before, and it really helped me develop communication skills with those who hadn’t been trained as biologists (think physics, computer science, and applied mathematics backgrounds) but who were interested in similar research questions. Being one of few experimental biologists in the lab I had plenty of opportunities to develop new experimental approaches, such as a 'virtual prey' system for studying predation and training fish to spatial targets to test models of group decision making. Iain’s approach of using advanced methods such as computer tracking allows a much richer and detailed measurement of behaviour than is usually achieved and this is something that I utilise in my own research now. I also learnt a lot from Iain about thinking beyond animal behaviour to how our research can learn from, and contribute to, other fields.
Finally, I spent a year as a teaching fellow in animal behaviour in Exeter university’s School of Psychology, which again exposed me to new ways of approaching research, and gave me an appreciation of the experimental and statistical rigour that is standard in psychological experiments.
Research interests
Since first studying animal behaviour I’ve been interested in the evolution of group living and also how groups form and are maintained over short time scales. My research has covered multiple aspects of group living, particularly the interaction between the behaviour of predators and social interactions in prey, and how inter-individual differences in groups interacts with group decision making. More recently, my research is including how predator and collective behaviour is affected by anthropogenic change in environmental variables, such as turbidity and anthropogenic noise. I use fish as a model system, both in the laboratory and in the field, because they are awesome.
Collective behaviour is a very inter-disciplinary area of research as it has importance to any organism that interacts socially, from microbes and plants all the way to humans. Although my training is very much in animal behaviour and behavioural ecology, I try to keep a broad perspective and collaborate with researchers in other fields. This includes physics and mathematics which provides a solid theoretical grounding for group processes and new analytic tools, and psychology which has a long history of studying social relationships in humans, many aspects of which apply to non-human animals as well.
Projects and supervisions
Research projects
8078 H2020 MSC 891915 DynFish
Principal Investigator
Description
How does the relationship between boldness (the extent to which animals take risks) and food intake shape anti-predator escape responses? The EU-funded DynFish project will answer this question, shedding light…Managing organisational unit
School of Biological SciencesDates
14/05/2021 to 13/05/2023
Motion illusions for defence
Principal Investigator
Managing organisational unit
School of Biological SciencesDates
01/12/2020 to 30/11/2023
Effects of Climate-Change Associated Stressors on Fish Social Behaviours
Principal Investigator
Managing organisational unit
School of Biological SciencesDates
01/10/2020 to 30/09/2023
Hunger and knowledge: foraging decisions in an uncertain and social world
Principal Investigator
Managing organisational unit
School of Biological SciencesDates
01/01/2018 to 30/06/2021
Using real predators and robot prey to investigate the importance of predators in prey responses
Principal Investigator
Managing organisational unit
School of Biological SciencesDates
01/10/2013 to 30/09/2018
Thesis supervisions
The effects of predator personality and cognition on predator-prey interactions
Supervisors
Investigating the Interactions between Social Behaviour and Habituation to a Novel Environment in Sticklebacks (Gasterosteus aculeatus)
Supervisors
Competitive Behaviour, Impact and Success of Invasive Tilapia (Oreochromis spp.) in Quintana Roo, Mexico
Supervisors
Investigating the impacts of environmental change on social behaviour in fish
Supervisors
The Combined Effects of Multiple Environmental Stressors on Predator-Prey Interactions in Freshwater Habitats
Supervisors
The impact of turbidity on the foraging ability and risk taking of two cichlid species
Supervisors
Investigating the impacts of anthropogenic noise on fish behaviour
Supervisors
The Adaptive Significance of Dynamic Colour Change in Zebrafish (Danio rerio)
Supervisors
Behavioural response of sheep to forage resources and parasite risk in an extensive grazing system
Supervisors
Lateralisation and sociability under natural and experimental predation pressure in the Trinidadian guppy (Poecilia reticulata)
Supervisors
Publications
Selected publications
01/06/2020Information can explain the dynamics of group order in animal collective behaviour
Nature Communications
Response to resources and parasites depends on health status in extensively grazed sheep
Proceedings of the Royal Society B: Biological Sciences
Predators attacking virtual prey reveal the costs and benefits of leadership
Proceedings of the National Academy of Sciences of the United States of America
Regulation between personality traits
Proceedings of the Royal Society B: Biological Sciences
Predatory Fish Select for Coordinated Collective Motion in Virtual Prey
Science
Recent publications
20/01/2025Blue acaras use pure pursuit rather than parallel navigation when pursuing robotic prey
Animal Behaviour
Dynamic colour change in zebrafish (Danio rerio) across multiple contexts
Royal Society Open Science
Machine Vision Applications for Welfare Monitoring in Aquaculture
Aquaculture, Fish and Fisheries
Quantifying animal social behaviour with ecological field methods
Royal Society Open Science
State-behaviour feedbacks between boldness and food intake shape escape responses in fish (Gasterosteus aculeatus)
Communications Biology