I am doing a GIS project on different coastal ecosystems and need a representation of such ecosystems. Corals, Mangroves and Seagrass I have, but kelp is missing...Thank you!
I'm not sure where you can find this shapefile, but it's likely the authors of the attached 2016 paper "Global patterns of kelp forest change over the past half-century" will have one. See Figure 1A.