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Volume 40 - Number 1 - 2005

Biomass of Ulva spp. (Chlorophyta) in three locations along the bayfront of La Paz, Baja California Sur, México

Ruth N. Aguila-Ramírez*, Margarita Casas-Valdez*, Claudia J. Hernández-Guerrero* y Alejandro Marín-Álvarez


(*) Becarios COFAA y EDI.
Centro Interdisciplinario de Ciencias Marina - Instituto Politécnico Nacional
Ap. Postal 592. La Paz, Baja California Sur, México




Distribution and standing crop of Ulva spp. were measured in three localities along the bayfront of La Paz, Baja California Sur, during 2001 and 2002. Some species of Ulva, formerly in the genus Enteromorpha, are utilized in some countries for human consumption. We utilized a systematic sampling method, using as sampling unit a 25 x 25 cm square placed every 10 m throughout transects perpendicular to the coastline which were drawn every 40 m. In both years the greatest average biomass was found at El Palmar. The largest biomass of Ulva spp. was recorded during May 2001 and February 2002. The average biomass was 351 g m-2 in 2001 and 537 g m-2 in 2002. The maximum values of the standing crop were found at El Kiwi in both years. The great increase in substratum in 2002 may explain the large volumes of the standing crop, estimated as 115 t wet. We recommend investigation to see if there is a market for this biomass leading to its sustainable exploitation.

Key words: Seaweed, standing crop, algal beds



1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
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