Multidisciplinary study of mud volcanoes and diapirs and their relationship to seepages and bottom currents in the Gulf of Cádiz continental slope (northeastern sector)

Palomino, Desirée; López-González, N.; Vázquez, J.T.; Fernández-Salas, L.M.; Rueda, José L.; Sánchez-Leal, R.F.; Díaz‐del‐Río, V.

doi:10.1016/j.margeo.2015.10.001

Cited by 48 publications

(59 citation statements)

References 80 publications

(123 reference statements)

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“…Aunque existen algunos estudios de distribución de S. darwini (Bremec 1990, da Silva y Castro 2011) no se han realizado investigaciones hasta la fecha sobre la presencia de esta especie en asociación a los depósitos de gas en los sedimentos . La asociación de la pluma de mar a los depósitos de gas en el estuario coincide con hallazgos de organismos pertenecientes al Orden Pennatulacea asociados a hidrocarburos en otros lugares del mundo (Barrie et al 2011, Bigham 2016, Palomino et al 2016.…”

Section: Efectos De Los Sedimentos Gasíferos Sobre La Comunidad Bentóunclassified

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

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Aliotta

Fiori

et al. 2018

Estuarine, Coastal and Shelf Science

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The aim of this thesis is to characterize the shallow gas deposits of the inner area of the Bahía Blanca estuary and to evaluate the effect of the gas-bearing sediments on the associated subtidal benthic communities. For this purpose, the distribution of shallow gas in the estuary was mapped through the analysis of highresolution seismic records. Based on this map, two study sites were selected (with gas and control) that only differed in the presence of gas in contact with the surface of the seabed. Acoustic methods were used to determine the stratigraphy and morphology of the site with gas and the adjacent area. In addition, the gas sediments were evaluated by means of the following analyses: grain size, organic matter content, X-rays and HPLC head space measurement. The benthic organisms of both sites were compared in terms of abundance, biomass, diversity, evenness, species richness, taxonomic and functional structure. The gas was found widely distributed in the estuary, both near and in contact with the surface of the seabed of the inner area of the Bahía Blanca estuary. It was evidenced in the form of acoustic turbidity and acoustic blanking. The seismo-stratigraphic column presented five seismic sequences of the late Pleistocene-Holocene. It was established that the gas origin is biogenic, being associated with a Middle Holocene deposit, from which it migrated until it was in contact with the surface of the seabed due to the permeability of the overlying strata. The gas in the surface of the seabed was evidenced in sonograms by means of the attenuation of the acoustic signal, which evidences a low cohesion Índice Dedicatoria…………………………………………………………………………………………………….I

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Section: Efectos De Los Sedimentos Gasíferos Sobre La Comunidad Bentóunclassified

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Bravo

Aliotta

Fiori

et al. 2018

Estuarine, Coastal and Shelf Science

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“…The MOW seems to represent one of the main water masses driving the distribution of CWCs across the NE Atlantic (Dullo et al, 2008;Somoza et al, 2014), promoting connectivity by the natural export of Mediterranean species and populations (Henry et al, 2014;Arnaud-Haond et al, 2017;Boavida et al, 2019). Several studies noted the presence of deep-sea suspension feeding species previously known only from the Mediterranean (e.g., the sponges Geodia anceps, Coelosphaera cryosi, and Petrosia raphida) at NE Atlantic locations, such as the Gulf of Cadiz (Spain; Palomino et al, 2016;Sitjá et al, 2018). This area is dominated by aggregations of scleractinians and gardens of large gorgonians and black corals (e.g., M. oculata, Acanthogorgia spp., Antipathes dichotoma, Leiopathes glaberrima; Figure 2) with particular locations, such as Gazul mud volcano, representing a biodiversity hotspot with more than 400 associated species (Rueda et al, 2016;Ramalho et al, 2018;Sitjá et al, 2018).…”

Section: Cold-water Coral Reefs and Gardensmentioning

confidence: 99%

Influence of Water Masses on the Biodiversity and Biogeography of Deep-Sea Benthic Ecosystems in the North Atlantic

et al. 2020

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Circulation patterns in the North Atlantic Ocean have changed and reorganized multiple times over millions of years, influencing the biodiversity, distribution, and connectivity patterns of deep-sea species and ecosystems. In this study, we review the effects of the water mass properties (temperature, salinity, food supply, carbonate chemistry, and oxygen) on deep-sea benthic megafauna (from species to community level) and discussed in future scenarios of climate change. We focus on the key oceanic controls on deep-sea megafauna biodiversity and biogeography patterns. We place particular attention on cold-water corals and sponges, as these are ecosystem-engineering organisms that constitute vulnerable marine ecosystems (VME) with high associated biodiversity. Besides documenting the current state of the knowledge on this topic, a future scenario for water mass properties in the deep North Atlantic basin was predicted. The pace and severity of climate change in the deep-sea will vary across regions. However, predicted water mass properties showed that all regions in the North Atlantic will be exposed to multiple stressors by 2100, experiencing at least one critical change in water temperature (+2 • C), organic carbon fluxes (reduced up to 50%), ocean acidification (pH reduced up to 0.3), aragonite saturation horizon (shoaling above 1000 m) and/or reduction in dissolved oxygen (>5%). The northernmost regions of the North Atlantic will suffer the greatest impacts. Warmer and more acidic oceans will drastically reduce the suitable habitat for ecosystem-engineers, with severe consequences such as declines in population densities, even compromising their long-term survival, loss of biodiversity and reduced biogeographic distribution that might compromise connectivity at large scales. These effects can be aggravated by reductions in carbon fluxes, particularly in areas where food availability is already limited. Declines in benthic biomass and biodiversity will diminish ecosystem services such as habitat provision, nutrient

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“…The GoC is an important area of seepage activity at a global scale, with the presence of more than 70 MVs and MV/diapir complexes located in different fields of the Spanish, Portuguese and Moroccan continental margins (Díaz-del-Río et al 2003, León et al 2007, Palomino et al 2016. MVs from the Spanish margin are found on the upper-middle continental slope of the GoC, around 300 to 1200 m depth.…”

Section: Introductionmentioning

confidence: 99%

“…This exchange of water masses, among other factors, promotes a high biological productivity and a particular biodiversity in the GoC, including a wide range of species of interest to fisheries (Fernández-Salas et al 2012, Díaz-del-Río et al 2014. This environmental context is enriched by a wide variety of seafloor morphostructures and the continuous dynamics of the area promoted by the MOW, the sediment mobilization and the expulsion of fluids (Fernández-Salas et al 2012, Díaz-del-Río et al 2014, Palomino et al 2016.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Multidisciplinary study of mud volcanoes and diapirs and their relationship to seepages and bottom currents in the Gulf of Cádiz continental slope (northeastern sector)

Cited by 48 publications

References 80 publications

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Influence of Water Masses on the Biodiversity and Biogeography of Deep-Sea Benthic Ecosystems in the North Atlantic

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

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