I study the ecological and evolutionary dynamics of aquatic food-webs. My focus is how fish communities and food-webs respond to changing environments, and how these responses depend on their species interactions. The most interesting part is when we start acknowledging that interactions are not static! Individuals engage in different interactions during their life, often depending on their body size. And because how they grow depends on how much they eat, this leads to interesting feed-backs between how individuals interact with their environment (including other individuals, of same or other species) and how they in turn perform. This shapes dynamics of populations, communities and food-webs.
Together with my students and close colleagues I study how species interactions, and variation in these among individuals, determine e.g. responses to climate change and fishing, and how contaminants accumulate in food-webs. We also study how to detect this in natural populations and how to account for it in advice to e.g. fisheries management. To do so we combine dynamic modelling with laboratory- and field mesocosm experiments, and develop novel time series methods and apply these to long-term fish community data, often in the Baltic Sea but also in lake systems and elsewhere.
Some ongoing projects are
- Effects of warming and desalinization on fish communities
- Novel methods to detect climate change impacts in interaction species
- Size-dependent interactions and bioaccumulation of dioxins in fish
- Fish community responses to rising temperatures and darker waters
- Fish physiological responses to interacting climate stressors
- Novel time series methods & advice for management of exploited fish communities
Find out more about our research on climate change effects on fish communities here!
NEWS: new PhD-course on Community Ecology running now. More information here.
- Viktor Thunell 2017- Climate change impacts on dynamics of exploited
- Max Lindmark 2016- How trophic interactions mediate physiological responses to climate change in food-webs
- Renee Van Dorst 2016- Fish community responses to darker and warmer waters (co-supervisor)
- Philip Jacobson 2015- Role of size-dependent resource- and habitat use for bioaccumulation (co-supervisor)
- Ulrika Beier 2013-2016 Habitat selection and indirect interactions in fish communities
· Torbjörn Säterberg 2017 Approximating food-web filtering of climate change responses in data poor systems
Previous post-doctoral fellows
- Marian Torres 2014-2016 Developing pelagic food web indicators accounting for species interactions
- Grégoire Certain 2014-2016 Resolving climate change impacts on natural food-webs using multivariate time series approaches
- Magnus Huss 2009-2011 Effects of fishing on marine food-webs with size-dependent interactions
- Jens Olsson 2009-2010 Integrated Ecosystem Analyses of the Baltic Sea
- Anssi Vainikka 2006-2009 Fisheries-induced evolution of maturation in Baltic Sea fish
Looking for a MSc thesis project in community dynamics theory or aquatic food-web dynamics? Get in touch!
Publikationer i urval
I publish with > 80 collaborators, so far in > 40 scientific articles, about 10 popular science articles and numerous export reports. Check Researchgate & Google Scholar for full list of publications and for citations.
Curious? Have a look at, for example:
- Svensson, F., Karlsson, E., Gårdmark, A., Olsson, J., Adill, A., Zie, J., Snoeijs, P. & Eklöf, J. S. 2017. In situ warming strengthens trophic cascades in a coastal food web. Oikos, 126:1150-1161. doi: 10.1111/oik.03773
- Torres, M.A., Casini, M., Huss, M., Otto, S.A., Kadin, M. & Gårdmark, A. 2017. Food-web indicators accounting for species interactions respond to multiple pressures. Ecological Indicators, 77, 67-79
- Casini, M., Käll, F., Hansson, M., Plikshs, M., Baranova, T., Karlsson, O., Lundström, K., Neuenfeldt, S., Gårdmark, A. & Hjelm, J. 2016. Dead zones, density-dependence and food limitation drive the body condition of a heavily exploited marine fish predator. Royal Society Open Science, 3, 160416. doi: 10.1098/rsos.160416.
- Gårdmark, A., Casini, M., Huss, M., Van Leeuwen, A., Hjelm, J., Persson, L. & de Roos, A. M. 2015. Regime shifts in exploited marine food-webs: detecting mechanisms underlying alternative stable states using size-structured community dynamics theory. Philosophical Transactions Royal Society, Series B, 370 (5), 20130262.
- Bernes, C., Carpenter, S.R., Gårdmark, A., Larsson, P., Persson, L., Skov, C., Speed, J.D.M. & Van Donk, E. 2015. What is the influence of a reduction of planktivorous and benthivorous fish on water quality in temperate eutrophic lakes? A systematic review. Environmental Evidence, 4 (7).
- Östman, Ö., Karlsson, O., Pönni, J., Kaljuste, O., Aho, T & Gårdmark, A. 2014. Ecosystem changes and eco-evolutionary dynamics in body size of herring (Clupea harengus) in the Bothnian Sea. Evolutionary Ecology Research, 16: 417-433.
- Huss, M., de Roos, A.M., van Leeuwen, A. & Gårdmark, A. 2014. Facilitation of fisheries by natural predators depends on life history of shared prey. Oikos, 23:1071-1080.
- Van Leeuwen, A., Gårdmark, A., Huss, M. & de Roos, A. M. 2014. Ontogenetic specialism in predators with multiple niche shifts prevents predator population recovery and establishment. Ecology, 95 (9), 2409-2422.
- Möllmann, C., Lindegren, M., Blenckner, T., Bergström, L., Casini, M., Diekmann, R., Flinkman, J., Müller-Karulis, B., Neuenfeldt, S., Schmidt, J. O., Tomczak, M. T., Voss, R. & Gårdmark, A. 2014. Implementing ecosystem-based fisheries management – from single-species to integrated ecosystem assessment and advice for Baltic Sea fish stocks. ICES Journal of Marine Sciences, 71 (5): 1187-1197.
- Gårdmark, A., Lindegren, M., Neuenfeldt, S., Blenckner, T., Heikinheimo, O., Müller-Karulis, B., Niiranen, S., Tomczak, M., Aro, E., Wikström, A. & Möllmann, C. 2013. Biological Ensemble Modelling to evaluate potential futures of living marine resources. Ecological Applications, 23(4), 742–754.
- Huss, M., de Roos, A.M., van Leeuwen, A., Casini, M. & Gårdmark, A. 2013. Cohort dynamics give rise to alternative stable community states. American Naturalist, 182(3), 374-392.
Curious of what’s up in the Baltic Sea food-webs or what happens in ecosystems when we fish? I happily give popular science talks, contribute to news articles popularing science or write popular science articles. Watch the SLU news site or get in touch.
Visit us on @FishinFoodwebs, Instagram, for news and fun research in our research group!