Marine plankton play a crucial role in the functioning of marine ecosystems and global biogeochemical cycles, while providing a number of important ecosystem services to human societies (e.g., oxygen production, food biomass, carbon sequestration, climate regulation). Recently, next generation sequencing has caused a step-change in our understanding of the ecology and evolution of marine plankton. However, plankton are still largely under-represented in biogeochemical and Earth System Models, including those used by the Intergovernmental Panel on Climate Change. The poor representation of plankton diversity in these models impairs our capacity to accurately anticipate the impact of climate change on plankton-mediated ecosystem services. Next generation sequencing also provides a huge quantity of data, which opens unprecedented opportunities for developing new machine learning tools for "big data" mining. Hence, there is a crucial need for training a new generation of innovative early stage researchers (ESRs) at the interface of key scientific disciplines such as marine ecology, 'omics' (genomics and transcriptomics), numerical modelling, climate sciences and data science, including artificial intelligence. To address this need, PRESERVE (Marine Plankton's Response to climate change and its impact on Ecosystem SERVicEs: Bridging the gap between genomics, modelling, and data science) proposes a unique international, multidisciplinary, and multisectoral high quality and innovative research and training network. It relies on the expertise, complementarity, and synergy of European world-class research and training centres, non-governmental organisations, governmental organisations, small and medium enterprises (SMEs), and multinational companies. The non-academic partners bring expertise in fisheries and aquaculture, biodiversity conservation, marine policy, environmental monitoring, biotechnologies, machine learning, data management, communication and public engagement.