Food web interactions

Lake Majajärvi

We have carried out numerous field sampling campaigns and experimental studies on this subject area. We have shown for instance, that in clay-turbid conditions, top-down regulation may not work in a manner predicted by the trophic cascade hypothesis. This is because turbidity has differential effects on top-down regulation exerted by fish and invertebrate predators.  Another large project explored the effects of climate change on inter- and intraspecific interactions in fish and invertebrate communities via increasing water color and turbulence. The effects of refuges (clay turbidity, low oxygen, high color, macrophyte stands) on predator-prey interactions have also had an important role in many studies.

The studies have been funded by the Academy of Finland, University of Helsinki and Lake Vesijärvi Foundation