An animal's behaviour, has broad ecological and evolutionary implications and is a crucial determinant for different fitness correlates. For example, it affects growth and reproduction, interspecific interactions and influences how animals cope with changes in the environment.
Behaviour modifying substances, such as pharmaceuticals and hormones, have a potential to make a big mess in aquatic ecosystems worldwide. Treated wastewater flows into rivers and streams every day meaning that the fish constantly swims around in a cocktail of substances. Many of these substances have been proven to modify the behaviour of fish.
In my PhD-project I study these behavioural changes, both in lab and more realistic set ups, and also try to figure out what these changes can lead to for whole ecosystems.