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Johan Höjesjö

Postdoctoral fellow, Animal Ecology


Tel: 46(0)31-773 36 36 | johan.hojesjo@bioenv.gu.se

Research interests


I am studying behavioural variation among salmonids using an interdisciplinary approach evolving both molecular and physiological tools. I presented my thesis (Behavioural tactics and domestication effects in salmonids) in 2002 where my main aim was to examine variation among individuals in relation to selection in wild and hatchery environments.

I am also interested in how various behavioural tasks can be reflected in the cardio-ventilatory response and together with Michael Axelsson from the department of Zoo Physiology I have developed a non invasive method to detect heart rate on free swimming fish.

My recent projects evolve a 2 year Post Doc (Habitat adaptations in salmonids, effects of intra- and inter-specific competition) at Cardiff School of Biological Science in Wales hosted by Dr Siân Griffiths.

At present I am working on a project (Behavioural variation in salmonids; implications for performance in the wild and stocking) to examine fitness variation in families of brown trout adopting different behavioural strategies. In addition I am also evolved in a project regarding intraspecific competition in salmonids (Asymmetric competition and population structure in juvenile brown trout) together with Rasmus Kaspersson.

The results from my research can aid in understanding local adaptation and the structuring of populations, which in turn may facilitate development of stocking tools as well as guidelines for protection and restoration of salmonid populations.

Publications


Höjesjö, J., Johnsson, J.I., Petersson, E. & Järvi,T. 1998: The importance of being familiar: individual recognition and social behaviour in sea trout Salmo trutta. Behavioural Ecology, 9: 445-451

Höjesjö, J., Johnsson, J.I. & Axelsson, M. 1999: Behavioural and heart rate responses to food limitation and predation risk, an experimental study on rainbow trout. Journal of Fish Biology, 55: 1009-1019

Johnsson, J.I., Höjesjö, J. & Fleming, I. 2001: Behavioural and heart rate responses to predation risk in wild and domesticated Atlantic Salmon. Canadian Journal of Fisheries and Aquatic Sciences, 58: 788-794

Höjesjö, J., Johnsson, J.I., and Bohlin, T. 2002. Can laboratory studies on dominance predict fitness of young brown trout in the wild? Behav. Ecol. Sociobiol. 52: 102-108

Bohlin, T., Sundström, L.F., Johnsson, J.I., Höjesjö, J., and Pettersson, J. 2002: Density- dependent growth in brown trout: effects on introducing wild and hatchery fish. J. Anim. Ecol. 71: 683-692.

Sundström, L.F., E. Petersson, J.I. Johnsson, J. Höjesjö, and T. Järvi. 2003: Hatchery selection promotes boldness in newly hatched brown trout (Salmo trutta): implications for dominance. Behavioral Ecology (15):192-198.

Höjesjö, J., Johnsson, J.I. & Bohlin, T 2004: Habitat Complexity reduces the growth of aggressive and dominant brown trout (Salmo trutta) relative to subordinates. Behavioural Ecology and Sociobiology (56) 286-289.

Griffiths, S., Brockmark, S., Höjesjö, J., & Johnsson, J. 2004: Coping with divided attention: the advantage of familiarity. Proc. R. Soc. Lond. B. (271):695-699

Höjesjö, J., Armstrong, J.D. & Griffiths, S.W. (2005): Sneaky feeding by salmon in sympatry with dominant brown trout. Animal Behaviour(69):1037-1041

Johan Höjesjö

Contact Information

Department of Biological and Environmental Sciences

Box 463, SE- 405 30 Göteborg

Visiting Address:
Medicinaregatan 18

Phone:
+46 (0)31- 786 00 00

Fax:
+ 46 (0)31- 41 67 29

Page Manager: Sven Toresson|Last update: 5/17/2012
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