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Title: Benthic Diatom Assemblages in an Abalone (Haliotis spp.) Habitat in the Baja California Peninsula 
Author: Beltrones, David A. Siqueiros; Valenzuela Romero, Guillermina
Date: 2004-07
Publisher: University of Hawai'i Press
Citation: Siqueiros Beltrones DA, Valenzuela Romero G. 2004. Benthic diatom assemblages in an abalone (Haliotis spp.) habitat in the Baja California Peninsula. Pac Sci 58(3): 435-446.
Abstract: Diatom assemblages from an abalone (rocky) habitat were sampled in
April and November 1999 and in April 2000 on the western side of Isla Magdalena,
RCS., Mexico. Overall 236 taxa were recorded, including 10 new records,
and 56 species that have been observed exclusively in this type of habitat
in the Baja California peninsula. The rocky habitat surveyed is much more
complex than expected because of different substrata (rock, fleshy macroalgae,
crustose corallines, erect corallines) available for colonization by diatoms at Isla
Magdalena. Although epilithic forms were identified, epiphytic diatoms were
more abundant. Thus the potential diet for abalone and other grazers is more
diverse than previously assumed (i.e., that mainly epilithic diatoms would be
their potential food source). A variation in structure was observed between the
two assemblages sampled in April because of a change in the species composition
of the samples. Most of the rock surface was covered by macroalgae. Thus,
the diatom associations consisted mainly of epiphytic forms. The high values
of H' corresponded to high species richness (S), whereas higher dominance (A)
corresponded to low S. The highest estimated value of H' was 5.39 (S = 82) for
the November 1999 rock-Lithophyllum assemblage. Similarity measurements,
using Morisita's index, indicate that differences in species composition and in
association structure may represent a distribution of diatom taxa according to
available substrata within the habitat rather than a year-to-year or seasonal
ISSN: 0030-8870

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