The area of primary interest is between Santos (SP) and Paraty (RJ) and any sources including maps would be greatly appreciated. Both English and Portuguese language is fine.
Dear Daniel, you find eclosed some paper on this topic where you can get information regarding the distribution of seagrasses. I hope it will be helpful.
Pitanga, M.E., Montes, M.J., Magalhães, K.M., Reis, T.N., 2012. Quantification and classification of the main environmental impacts on a Halodule wrightii seagrass meadow on a tropical island in northeastern Brazil. Anais da Academia Brasileira de Ciências 84, 35-42.