The role of Ulva spp. as a temporary nutrient sink in a coastal lagoon with oyster cultivation and upwelling influence |
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Authors: | José A Zertuche-González Víctor F Camacho-Ibar Isaí Pacheco-Ruíz Alejandro Cabello-Pasini Luis A Galindo-Bect José M Guzmán-Calderón Víctor Macias-Carranza Julio Espinoza-Avalos |
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Institution: | 1. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas, Apartado Postal 453, Ensenada, Baja California, 22860, Mexico 2. ECOSUR, Apartado postal 424, Chetumal, Quintana Roo, 77000, Mexico
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Abstract: | Bahía San Quintín is a coastal lagoon with large Ulva biomass and upwelling influence. Previous observations suggest that Ulva has increased recently as a result of oyster cultivation. To evaluate the possible role of Ulva as a temporary nutrient sink, biomass and tissue C, N, and P were determined seasonally. Maximum biomass was present during
spring and early summer (1,413–1,160 t (dry)) covering about 400 ha. However, the biomass decreased to 35 t (dry) by winter.
The mean annual percentage of Ulva C, N, and P was 28%, 2%, and 0.14%, respectively. This study shows that Ulva can store up to 28 t of N and 2 t of P in Bahía San Quintín during spring–summer. Ulva may be displacing the seagrass Zostera marina subtidal beds. A partial removal of the seaweed would reduce the risk of eutrophication and the displacement of eelgrass
beds. |
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