(Bielefeld University) Aphids – who hasn't been bothered by these little insects at one time or another? Why do they reproduce on plants so successfully? These are among the questions that Professor Dr Caroline Müller and her research team are addressing at Bielefeld University's Faculty of Biology. They have found out that aphids are able to influence the quality of their food, and that this may enable them to construct a niche on their own host plants.