We now have an open Researcher position in environmental science, with focus on aquatic ecology and ecoimmunology. Effects of invasive species on the Hanöbukten bay and Baltic Sea ecosystems - threats and opportunities The ecosystem of the Baltic Sea is in many ways unique, where many of the species have local adaptations to their surroundings. But this sensitive environment is increasingly threatened, by e.g. climate changes, pollution and invasive species. An invasive species is defined as a species that has spread to new ecosystems where it establishes itself and causes extensive disruptions in the ecosystem. For example, one major recent concern is the spread and migration of the round goby (Neogobius melanostomus),