Intertidal seaweeds from North Atlantic Patagonian coasts, Argentina.

CROCE, M.E.; GAUNA, M.C.; FERNÁNDEZ, C.; PARODI, E.R.

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Biotaxa

Año: 2015 vol. 11 p. 1 - 8

1809-127X

The coasts located between 39°S and 41°S in theArgentinean biogeographic province have been described by impoverished seaweedassemblages, however the floristic information about this region is sparse. Theaim of this study was to survey the intertidal seaweeds inhabiting three sitesin the oceanographic system ?El Rincon? (Buenos Aires, Argentina). A total of42 taxa were identified with a dominance of Rhodophyta species. The sandstoneoutcrops (SO) had 29 taxa, whereas both the tidal flat (TF) and oyster reefs(OR) had 11 taxa. The estuarial species Ulva intestinalis and Ulva proliferawere recorded in TF, whereas calcified macroalgae were only found in SO. Thedifferences in richness and composition of seaweed assemblages were associatedwith substrate type, wave exposure, incident light and salinity. Thesedifferences were also evidenced by a dissimilar number of functional groups,which was higher in SO with a dominance of filamentous macroalgae.