Like matryoshka dolls: One insect species introduced decades ago to a small island had an effect on several insect populations

Researchers thought 30 years ago that they just introduced some Glanville fritillary butterfly larvae on a small island in the Åland islands, Finland. Little did they know that within the butterfly larvae there nested two other insect species and a bacterial symbiont. This created a unique opportunity to study how a local accidental introduction of insects can affect the dynamics and genetics of the neighbouring populations.

source https://www.sciencedaily.com/releases/2021/08/210802115002.htm