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Ulvacean blooms are generally characterized by one or more Ulva species, some of which are common toblooms across a broad geographic range. In tropical environments the identified stimuli that inducereproductive development of Ulva are restricted to temperature, salinity, dehydration and fragmentation.Culture studies have been prolific in describing the reproduction of Ulva species, but its reproductivechanges in natural environment have not been described yet. Hence, seasonal changes were described inreproductive stages and their relationship with biomass and environmental factors of Ulva species at fourmacroalgal blooms in a subtropical bay. Eight Ulva species were found: U. acanthophora, U. clathrata,U. flexuosa, U. intestinalis, U. lactuca, U. lobata, U. nematoidea and U. rigida. Reproductive stage and biomassvaried according to site and season. Five species showed four reproductive stages (vegetative, thalluswith fully differentiated zooids in formation and empty cells after zooids release); for the remainingspecies only vegetative thalli were found. Ulva rigida showed the highest biomass values, followed byU. acanthophora, following a seasonal pattern.

Palabras clave: Ulva; Reproduction; biomass; Temperature; nutrients; Gulf of California

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