Scientia Marina, Forthcoming Articles

Molluscs from benthic habitats of the Gazul mud volcano (Gulf of Cádiz)


https://doi.org/10.3989/scimar.05027.17A

Olga Utrilla
Departamento de Biología Animal, Universidad de Málaga, Spain
orcid https://orcid.org/0000-0002-7784-2594

Serge Gofas
Departamento de Biología Animal, Universidad de Málaga,, Spain
orcid https://orcid.org/0000-0002-3141-3700

Javier Urra
Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, Spain
orcid https://orcid.org/0000-0002-0255-7246

Pablo Marina
Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, Spain
orcid https://orcid.org/0000-0001-6629-2366

Ángel Mateo-Ramírez , Spain
orcid https://orcid.org/0000-0002-3825-3279

Nieves López-González
Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, Spain
orcid https://orcid.org/0000-0003-4680-7451

Emilio González-García
Departamento de Biología Animal, Universidad de Málaga - Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, Spain
orcid https://orcid.org/0000-0003-2018-468X

Carmen Salas
Departamento de Biología Animal, Universidad de Málaga, Spain
orcid https://orcid.org/0000-0002-7372-1939

José Luis Rueda
Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, Spain
orcid https://orcid.org/0000-0003-4632-1523

Abstract


Molluscs from the Gazul mud volcano and its adjacent areas in the northern Gulf of Cádiz were studied using differ­ent sampling methods. This mud volcano has vulnerable deep-sea habitats and a potential high biodiversity. A total of 232 species were identified from the taxocoenosis and thanatocoenosis, of which 86 are new records for the Spanish margin of the Gulf of Cádiz, three of them are new records for Spanish waters and two species are new to science. The high species richness observed could be related to the combination of different sampling methods, the study of the thanatocoenosis, the high habitat heterogeneity and the geographical location of the Gazul mud volcano between different biogeographical regions. The best-represented species were Bathyarca philippiana, Asperarca nodulosa, Leptochiton sp., Astarte sulcata and Limopsis angusta. The thanatocoenosis harboured, with low frequency, species that are typical of northern latitudes, species indicating past seepage, species from the shelf and species restricted to particular hosts. The taxocoenosis found in different areas of Gazul (the mud volcano edifice, erosive de­pression and adjacent bottoms) generally displayed significant differences in multivariate analyses. Furthermore, the environmental parameters related to environmental complexity and food availability displayed the highest linkage with the molluscan fauna.

Keywords


molluscs; Gazul; mud volcano; Gulf of Cádiz; biodiversity; cold seep; vulnerable habitats; deep-sea

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