Sedimentary features and processes in the Nazaré and Setúbal submarine canyons, west Iberian margin

Arzola, R.G.; Wynn, Russell B.; Lastras, Galderic; Masson, Douglas G.; Weaver, P. P. E.

doi:10.1016/j.margeo.2007.12.006

Cited by 129 publications

(109 citation statements)

References 46 publications

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“…The Whittard Canyon is a very active and open system, acting as a conduit of sediment into the deep sea (de Stigter et al, 2007;Arzola et al, 2008). It funnels organic matter to depth via a variety of mechanisms including tidal currents, internal waves and turbidity flows (Duineveld et al, 2001;Quaresma et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…This can result in increased turbulence and sediment resuspension, leading to the creation of nepheloid layers and turbidity flows within the canyon (de Stigter et al, 2007;Arzola et al, 2008). The combination of these phenomena make canyons significant for shelf-slope particulate exchange (Oliveria et al, 2002;Quaresma et al, 2007;Arzola et al, 2008;Garcia et al, 2008). Consequently, canyons are highly heterogeneous environments leading to the creation of a wide variety of niches for biological communities.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of cold-water corals in the Whittard Canyon, NE Atlantic Ocean

Morris

Tyler

Masson

et al. 2013

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tThe deep-sea floor occupies about 60% of the surface of the planet and is covered mainly by fine sediments. Most studies of deep-sea benthic fauna therefore have concentrated on soft sediments with little sampling of hard substrata, such as rocky outcrops in submarine canyons. Here we assess the distribution and abundance of cold-water corals within the Whittard Canyon (NE Atlantic) using video footage from the ROV Isis. Abundances per 100 m of video transect were calculated and mapped using ArcGIS. The data were separated into five substratum types, 'Sediment', 'Mixed Sediment and Rock', 'Sediment Slope', 'Lophelia reef' and 'Lophelia and rock'. Abundance and community structure were compared. A maximum abundance of 855 coral colonies per 100 m of ROV transect were observed with 31 coral types identified. Highest taxon richness was observed along a 'Lophelia reef' area, although a larger richness of Octocorallia was observed away from the 'Lophelia reef' areas. 'Lophelia reef' and 'Lophelia and rock' areas were found to have a different coral community structure from the other substratum types. We suggest this is the result of Lophelia outcompeting other coral types because there is increased coral taxon richness in areas without Lophelia. We also hypothesise that the hydrodynamic regime within the Whittard Canyon results in differences in organic matter input including higher quality food, in comparison with other deep-water environments, leading to changes in the coral communities.Crown

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distribution of cold-water corals in the Whittard Canyon, NE Atlantic Ocean

Morris

Tyler

Masson

et al. 2013

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

show abstract

“…canyons, in which the sediment transport is driven by the action of tidal currents, gravity flows and turbidity currents (Arzola et al, 2008;de Stigter et al, 2007). Both canyons are located under an area of high surface productivity (154 to 556 g C m -2 y -1 ) (Álvarez-Salgado et al, 2003).…”

Section: Cap De Creus Canyon Benthic Foraminifera In Comparison To Otmentioning

confidence: 99%

Living deep-sea benthic foraminifera from the Cap de Creus Canyon (western Mediterranean): Faunal–geochemical interactions

Contreras-Rosales

Koho

Duijnstee

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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“…However, knowledge of nematode feeding ecology and their actual contribution to carbon mineralisation processes in the 20 deep sea is poor (Soetaert et al, 1997). In canyons, such as the Nazaré Canyon on the Portuguese continental margin, where sediment deposition rates and levels of bioavailable OM are high (Arzola et al, 2008;de Stigter et al, 2007;Garcia and Thomsen, 2008;Pusceddu et al, 2010), meiobenthos might play an important role in benthic food webs. Ingels et al (2009) concluded that nematode assemblages in the Nazaré Canyon showed particular adaptations (e.g.…”

Section: Introductionmentioning

confidence: 99%