The Invasive Species Specialist Group (ISSG) is an organization that specializes in addressing the issue of invasive species. One of its significant contributions is the development of the Global Invasive Species Database (GISD), which serves as a comprehensive resource for information about invasive species from around the world. This database contains data on invasive species' impacts, distribution, biology, and management strategies.

The ISSG is affiliated with The International Union for Conservation of Nature (IUCN). The IUCN is a global organization dedicated to conserving nature and promoting sustainable use of natural resources. It is widely recognized for its work in assessing the conservation status of species and ecosystems and providing guidance on conservation efforts worldwide.

In summary, the ISSG, responsible for the Global Invasive Species Database, belongs to The International Union for Conservation of Nature (IUCN). Their collaborative efforts contribute to the understanding and management of invasive species, which is essential for preserving biodiversity and protecting ecosystems.