GACS is short for the Global Alliance of Continuous Plankton Recorder Surveys, which is an international scientific organisation that was established in September 2011.
The goal of GACS is "to understand changes in plankton biodiversity at ocean basin scales through a global network of CPR surveys".
GACS has a number of specific aims, which include:
to develop a global Continuous Plankton Recorder (CPR) database
to produce a regular Ecological Status Report for global plankton biodiversity
to ensure that common standards and methodologies are maintained
to provide an interface for plankton biodiversity with other global ocean observation programmes
to set up and maintain a website for publicity and data access
to facilitate new CPR surveys and develop capacity building procedures
to facilitate secondments of CPR scientists between GACS institutions.