The algal vegetation of the Ria de Arosa (NW. Spain)

This study forms a part of biological, oceanographical, and sedimentological investigations carried out in the Ria de Arosa (NW. Spain) 1962—1964. Details of the aim and scope of these investigations have been set forth by Brongersma and Pannekoek (1966). The present paper deals with the macroscopic algae of this region. Firstly, it was attempted to obtain a complete survey of the floristic composition. These data were utilized in a study of algal phytogeography (van den Hoek and Donze, 1967). Secondly, a rough description of the intertidal vegetation types and zonation patterns is given. Thirdly, the local distribution of species and vegetation types is outlined with respect to the main environmental factors. Fourthly, a rather detailed picture of the depthdistribution of many species is given.