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Title

Structure and dynamics of the Cystoseira caespitosa Sauvageau (Fucales, Phaeophyceae) community in the North-Western Mediterranean

Other TitlesEstructura y dinámica de la comunidad de Cystoseira caespitosa Sauvageau (Fucales, Phaeophyceae) en el Mediterráneo noroccidental
AuthorsBallesteros, Enric ; Ballesteros, Enric
KeywordsPhytobenthos
Cystoseira
Structure
Production
North-Western Mediterranean
Fitobentos
Estructura
Producción
Mediterráneo noroccidental
Issue Date1990
PublisherConsejo Superior de Investigaciones Científicas (España)
CitationScientia Marina 54(2): 155-168 (1990)
Abstract[EN] Research on community structure and dynamics was carried out in a Cystoseira caespitosa community from Tossa de Mar (North-Western Mediterranean). Cystoseira caespitosa occurs on rocky coasts, always in sheltered, shallow and unpolluted waters from the Gulf of Lions and the Costa Brava. Species composition is dominated by C. caespitosa, C. compressa and Halopteris scoparia, with a large number of small photophilic species such as Polysiphonia fruticulosa, Sphacelaria cirrosa and Corallina granifera as epiphytes. A cespitose layer mainly constituted by turfs of Gelidium pusillum and Corrallina elongata is always present. Encrusting calcareous algae belonging to Corallinaceae and Peyssonneliaceae occur in the basal stratum of the community, together with the cnidarian Aiptasia diaphana. Algal biomass ranges between 900 and 2250 g dwt m-1 (including calcareous algae) and percentage coverage ranges between 260 and 1000%. Species richness, species diversity and pattern diversity are very high in relation to other Mediterranean phytobenthic communities; mean number of species per sample (784 cm2) amounts to 105 species and Shannon's diversity index ranges between 2.0 and 4.5 bits. Diversity/area curves always become stabilized at surfaces of 250 cm2 but areas of 500 cm2 are recommended to pick up representative samples of the community both from a qualitative and a quantitative point of view. There is great structural and functional variation during the year, as it has been indicated for most Mediterranean photophilic algal communities. The production phase occurs in winter-spring, reaching a biomass maximum in June. Highest growth of Cystoseira occurs in March-April with a daily production of 4-10 g dwt m-1. Growth seems to be mainly limited by nitrogen availability. Annual production of Cystoseira caespitosa depends on the density of individuals, and it has been estimated at 460-800 g dwt m-2. A mean daily production of 0.5-0.8 g C m-2 supposes a rather high value for aquatic ecosystems with strong depletion of nutrients from waters such as those of the Mediterranean. Nevertheless, these values are much lower than production values found in Cystoseira mediterranea, a species which replaces C. caespitosa in exposed places. Structural and functional differences between both Cystoseira communities are attributed to hydrodynamism. The Cystoseira caespitosa community, characteristic of sheltered places, has a higher species richness and diversity, but its production is lower, as corresponds to a system with a lower input of energy. Auxiliary energy is emphasized as an essential point to understand the structure and dynamics of Mediterranean phytobenthic communities.
[ES] Se analiza la composición específica, la estructura y la dinámica de la cmunidad de Cystoseira caespitosa, exclusiva de los lugares calmados de la parte superior de la zona infralitoral (0.3-3 m) en las costas rocosas del golfo de Le6n y la Costa Brava. La comunidad está dominada por Cystoseira caespitosa, C. compressa y Halopteris scoparia, epifitadas por un elevado número de pequeñas especies fotófilas como Polysiphonia fruticulosa, Sphacelaria cirrosa and Corallina granifera. En el substrato aparecen numerosas especies de pequeño porte (Gelidium pusillum, Corrallina elongata, entre otras), diversas algas coralináceas incrustantes y el actiniario Aiptasia diaphana. La comunidad es muy rica en especies y su diversidad es elevada. Como ocurre en la mayoría de las comunidades de algas fotófilas mediterráneas, existe una gran variación estructural y funcional a lo largo del ano. La fase de producción ocurre en invierno-primavera, alcanzandose una biomasa máxima en el mes de junio (2-3 Kg ps m-2). El crecimiento de Cystoseira caespitosa es máximo en marzo-abril, con producciones que oscilan entre 4 y 10 g ps m-2 d-1 y parece estar gobernado, principalmente, por la disponibilidad de nitrógeno. La producción de Cystoseira caespitosa se ha elevado en 460-800 g ps m2 año-1, equivalente a una media diaria de 0,5 a 0,8 g C m2. Estos valores de producción son considerables si se tiene en cuenta las bajas concentraciones de nutrientes disueltos presentes en el agua, eoro son muy inferiores a los valores obtenidos para Cystoseira mediterránea, especie que substituye Cystoseira caespitosa en los lugares batidos.
Description14 páginas, 7 figuras, 8 tablas.
Publisher version (URL)http://www.icm.csic.es/scimar/index.php/secId/6/IdArt/2460/
URIhttp://hdl.handle.net/10261/28619
ISSN0214-8358
E-ISSN1886-8134
Appears in Collections:(CEAB) Artículos
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