3 years ago

Species of Ulva (Ulvophyceae, Chlorophyta) as indicators of salinity

Species of Ulva (Ulvophyceae, Chlorophyta) as indicators of salinity
Salinity is one of the main determinants of species diversity in macroalgae. This study analyzes the occurrence of 16 species of the genus Ulva (Ulvaceae, Chlorophyta) in the salinity gradient. Ulva populations originated mainly from shores and estuaries with a minor number occurring in ocean lagoons, coastal lakes, canals and rivers. Ulva species were found in waters where salinity ranged from <0.5 to 49 PSU. Most species were most commonly found in euhaline waters. It was observed that Ulva species with tubular thalli were present in a very wide range of saline waters (from fresh to hyperhaline waters). Ulva species with leaf-shaped thalli, however, were encountered chiefly in euhaline waters while being least often present in hyperhaline waters. It has been shown that the morphotype of the thallus (leaf-shaped or tubular) is correlated with water salinity levels. Ulva species with leaf-shaped thalli are not found in fresh (< 0.5 PSU) and poorly saline (<10 PSU) waters, whereas tubular species are recorded in freshwater, brackish, and marine ecosystems (from 0 to 39 PSU).

Publisher URL: www.sciencedirect.com/science

DOI: S1470160X17306982

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