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Puerto Deseado is a locality on the Atlantic coast of Patagonia (47°45′ S, 65°54′ W) with a ria (fjord-like estuary) several kilometres long that follows the course of Rio Deseado. From 1969 to 1972, we followed the development of 50 species of mostly intertidal brown macroalgae at five sites, one outside the ria and four within. Collections and observations were made at least once monthly to determine species identities, vegetative and reproductive states of the thalli, and variations between the different sites. Several environmental factors were used to describe the sites, including seawater temperature, season, and hydrodynamics. In summer, there were more species, coincident with the highest proportion of plurilocular sporangia. In contrast, unilocular sporangia appeared mostly in autumn. The difference between the five sites was well defined: nine species from the outermost site did not occur inside the ria, and only 13 species were found at all five sites. The number of species gradually declined towards the interior of the ria. The aim of this study was to document brown algal vegetation at the beginning of the 1970s to provide a baseline dataset before the start up of large-scale port activity.

Seasonal periodicity and reproduction of brown algae (Phaeophyceae) at Puerto Deseado (Patagonia)