I study the effects of warmer winters, as a consequence of climate change, on predator-prey interactions and early life-history performance in fish, mainly brown trout (Salmo trutta) and burbot (Lota lota). My main focus is behavioral ecology, but I am also interested in physiological stress responses and molecular changes, such as mRNA activity. In addition, I have been involved in projects examining the effects of parasitic larvae of the endangered freshwater pearl mussel (Margaritifera margaritifera) on brown trout.
Undergraduate and masters courses in scientific methods in freshwater ecology. Sampling and examining abiotic conditions, plankton, benthos and fish in both streams and lakes. Undergraduate courses in behavioral and community ecology.
Karl Filipsson; Tina Petersson; Johan Höjesjö; John J. Piccolo; Joacim Näslund; Niklas Wengström; E. Martin Österling (2018). Heavy loads of parasitic freshwater pearl mussel (Margaritifera margaritifera L.) larvae impair foraging, activity and dominance performance in juvenile brown trout (Salmo trutta L.). Ecology of Freshwater Fish 27: 70-77.
Karl Filipsson; Jeroen Brijs; Joacim Näslund; Niklas Wengström; Marie Adamsson; Libor Zavorka; E. Martin Österling; Johan Höjesjö (2017). Encystment of parasitic freshwater pearl mussel (Margaritifera margaritifera) larvae coincides with increased metabolic rate and haematocrit in juvenile brown trout (Salmo trutta). Parasitology Research 116: 1353 -1360.