The effect of network properties on the dynamics of marine social-ecological systems and their response to multiple drivers
Human impacts, such as climate change and fishing, are transforming the species composition and habitats at world's oceans at unprecedented rates. Evidence on individual species' responses to different drivers exist, but the impact of species interactions to ecosystem outcomes has only recently gained recognition in marine resource management. Indirect effects may amplify or modify ecosystem responses to management in unforeseen ways if the combined effect of interacting species and external drivers is not taken into consideration. I use tools of ecological and social network analysis to study how the structure and functioning of marine food webs change when exposed to changes in drivers, and how the change in structure affects the ecosystem responses. A significant focus in my PhD project is to test new network analysis approaches to analyze the patterns of interactions in marine social-ecological systems. My Phd reserarch examines the effect of climate change mainly in the Baltic Sea.
Examining the impacts of large-scale changes in marine ecosystems from the perspective of network science, my research demonstrates that marine resource management needs to account for multiple stressors and their synergestic effects on species interactions in an ecosystem context so that marine resources can support ecosystem services for the future.
I have M.Sc. in physical geography. In addition I have studied economics (BBA) and gained M.Ed. for physical geography and biology.
Yletyinen, J. et al., 2016. Regime shifts in marine communities: a complex systems perspective on food web dynamics. Proceedings of the Royal Society of London B: Biological Sciences, 283(1825).
Rocha J., Yletyinen J., Biggs R., Blencker T., Peterson G. 2015. Marine regime shifts: drivers and impacts on ecosystem services. Phil. Trans. R. Soc. B. 370 (1659), 20130273.
Boonstra, W.J. et al., 2015. What are the major global threats and impacts in marine environments? Investigating the contours of a shared perception among marine scientists from the bottom-up. Marine Policy, 60, pp.197–201.
Pedersen, M.W. et al., 2015. Trends in marine climate change research in the Nordic region since the first IPCC report. Climatic Change, pp.1–15.
Niiranen S., Yletyinen J., Tomczak M.T., Blenckner T., Hjerne O., MacKenzie B.R., Müller-Karulis B., Neumann T., Meier M.H.E. 2013. Combined effects of global climate change and regional ecosystem drivers on an exploited marine food web. Global Change Biology 19 (11), 3327-2242.
Tomczak M.T., Heymans J.J., Yletyinen J., Niiranen S., Otto S.A., Blenckner, T. 2013. Ecological network indicators of ecosystem status and change in the Baltic Sea. PLoS ONE 8(10): e75439.
Hutniczak, B., Nieminen, E., Hoffman, J., Yletyinen J. 2015. Input-Efficiency of Fishing Cod in the Baltic Sea – Comparing Major EU Trawler Fleets. University of Helsinki Working Paper, 68.