Today it is known that evolutionary processes happen on a very short timescale and will feed into ecological interactions. It is important to understand adaptation by natural selection: what it can achieve, how quickly, and can we count on it to alleviate some of the problems we humans have created?
Aquatic organisms show a tremendous diversity in abundance, life cycles, habitat requirements, natural enemies and environmental stressors they have to cope with. We work on their natural populations and shy away from using model organisms in order to study how the populations out there adapt. If a question is good we ignore disciplinary boundaries in biology and try to find a way to address it. But generally we use a lot of simple, but elaborate field and laboratory experiments to find an answer using test tubes as frequently as buckets.