Department of Physics, Chemistry and Biology (IFM)

• The present study suggests that the success of a reintroduction attempt is affected by both changes in the food-web and the change in the species itself.

• There are risks   in reintroducing a species to a food-web.

• The thime species spend in captivity should be minimized to reduce negative effects of captivity.
• Habitats should be  restored before reintroducing species back into it.
• It is important to investigate the possible outcomes and effects of a planned reintroduction, some factors that is important to know is; on which trophic level the species were/is on, interaction with other species (how the species is linked to other species (strength and number of links), if it is a keystone species etc.) and if the food web is species rich or poor.  

However it is always hard to asses the outcomes of a reintroduction, therefore much precaution and studies should be used before a reintroduction is made. In worst case the whole food web could collapse.

First of all I would like to thank my supervisor Bo Ebenman, who has helped and inspired me through this study with interesting insights and discussions. Further I would like to thank Torbjörn Säterberg who has given me invaluable help a countless number hours through the modelling and statistical parts and a general good support through this whole study. I would like to thank my office-mates and all the people at the theoretical department for providing a good friendly environment that was easy and inspiring to work in.