The composition, abundance, and distribution of epiphytic macroalgae living in meadows of Zostera marina L. in the northwestern Iberian Peninsula are here analyzed. We identified 63 species: 40 red algae, 16 brown algae, and 7 green algae. Most of them are classified as filamentous or filiform functional forms, while Pneophyllum fragile Kütz. was the only encrusting species. In general, the surface covered by epiphytes on the leaves of Zostera marina was low and a 43% of species were only found in juvenile stages. Regarding their frequency, 10 species were collected in the majority of the areas, while others were rare. Most species were found both epiphytic and in other substrata of the meadows, but 9 were exclusively epiphytic. We detected 9 introduced species.Resumen. Se han analizado la composición, la abundancia y la distribución de macroalgas epifitas que viven en praderas de Zostera marina L. del noroeste de la península ibérica. Se han identificado 63 especies: 40 algas rojas, 16 pardas y 7 verdes. La mayoría pertenecen a los grupos funcionales filamentosos o filiformes, excepto Pneophyllum fragile Kütz., la única especie costrosa. En general, la cobertura de epifitos en las hojas de Zostera marina fue baja y un 43% de las especies solo se encontraron como estadios juveniles. En cuanto a su frecuencia, 10 de ellas se recolectaron en la mayoría de las áreas, mientras que el resto fueron más raras. La mayor parte de las especies se encontraron tanto epifitas como en otros substratos de las praderas, si bien 9 resultaron exclusivamente epifitas. Detectamos 9 especies introducidas.How to cite this article: García-Redondo V., Bárbara I. & Díaz-Tapia P. 2019. Biodiversity of epiphytic macroalgae (Chlorophyta, Ochrophyta, and Rhodophyta) on leaves of Zostera maritima in the northwestern Iberian Peninsula. Anales del Jardín Botánico de Madrid 76 (1): e078. https://doi.org/10.3989/ajbm.2502.Title in Spanish: Biodiversidad de macroalgas epifitas ( Chlorophyta, Ochrophyta y Rhodophyta) e n hojas de Z ostera marina en el noroeste de la península ibérica.
New records and geographical additions to the benthic marine flora of the Atlantic Iberian PeninsulaPalabras clave. Atlántico Península Ibérica, distribución, macroalgas marinas, nuevas citas.Key words. Atlantic Iberian Peninsula, geographical distribution, new records, seaweeds.
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