publication . Doctoral thesis . 2010

Invasion of top and intermediate consumers in a size structured fish community

Ask, Per;
Open Access English
  • Published: 01 Jan 2010
  • Publisher: Umeå : Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
Abstract
In this thesis I have investigated the effects of invading top and intermediate consumers in a size-structured fish community, using a combination of field studies, a lake invasion experiment and smaller scale pond and aquaria experiments. The lake invasion experiment was based on introductions of an intermediate consumer, ninespine stickleback (Pungitius pungitius L.), in to allopatric populations of an omnivorous top predator, Arctic char (Salvelinus alpinus L.). The invasion experiment was performed in two tundra lakes and in two birch forest lakes to investigate the effect of climate on the invasion success. I found that the effect of sticklebacks on char wa...
Subjects
free text keywords: Invasion, intraguild predation, size-structure, cannibalism, climate, temperature, Arctic char, ninespine stickleback, Ecology, Ekologi
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