New view of the Belgica Mounds, Porcupine Seabight, NE Atlantic: preliminary results from the Polarstern ARK-XIX/3a ROV cruise

Foubert, Anneleen; Beck, T.; Wheeler, Andrew J.; Opderbecke, Jan; Grehan, Anthony; Klages, Michaël; Thiede, Jörn; Henriet, Jean‐Pierre; Ark-Xix, Polarstern; Party, a Shipboard Scientific

doi:10.1007/3-540-27673-4_20

Cited by 51 publications

(42 citation statements)

References 17 publications

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“…In addition, the Celtic sites experience the influence of O 2 -depleted MOW. Although the measured values of dissolved oxygen were almost twice as high at the Norwegian sites, the internal reef structure of the cold-water coral habitats is not considerably different (Mortensen et al 1995, Freiwald 2002, Foubert et al 2005, suggesting that cold-water corals live within a wide range of dissolved oxygen. This is in agreement with a study by Dodds et al (2007), who demonstrated a wide tolerance of Lophelia with respect to oxygen values in an experimental setup.…”

Section: Physical/oceanographic Parametersmentioning

confidence: 77%

“…For example, seamounts and canyons are areas with pronounced vertical relief with hard substrata providing ideal settling sites for corals, often associated with a strong current regime and therefore low sediment deposition (Herring 2002). The scleractinian Lophelia pertusa has been recorded on morainic ridges, lithified sediments, and vertical cliffs (Freiwald et al 1999, Noé et al 2006, but also in coarse sand habitats (Foubert et al 2005, Huvenne et al 2005. It is assumed that the coral initially settles on a hard substrate such as a pebble or a shell (e.g.…”

Section: Geological and Biological Factorsmentioning

confidence: 99%

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Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Dullo¹,

Flögel²,

Rüggeberg³

2008

Mar. Ecol. Prog. Ser.

205

202

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Along the Atlantic European continental margin, living cold-water coral reefs occur over a wide bathymetric and hydrographical range. Focusing on 2 regions, the Celtic and the Norwegian shelves, we found that cold-water coral reefs are limited to different intermediate water masses. Measurements of the physical and geological properties showed that parameters such as temperature, salinity, dissolved oxygen content, current intensities, and different substrates vary widely without specifically impacting the distribution of living cold-water coral reefs. The habitat of living reefs within the NE Atlantic comprises a temperature-salinity field, with its lower boundary equivalent to the Intermediate Salinity Maximum (ISM). The ISM on the Celtic margin is represented by Mediterranean Outflow Water (MOW), but is replaced by Atlantic Water (AW) on the Norwegian margin. The upper limit corresponds to water mass boundaries of Eastern North Atlantic Water / MOW on the Celtic margin and Norwegian Coastal Water / AW on the Norwegian margin. Our study shows that cold-water corals in the North Atlantic tolerate a wide range of environmental conditions. However, our data indicate that living cold-water coral reefs occur within the density envelope of sigma-theta (σ Θ ) = 27.35 to 27.65 kg m -3 , thus highlighting the importance of physical boundary conditions for cold-water coral growth and distribution.

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Section: Physical/oceanographic Parametersmentioning

confidence: 77%

Section: Geological and Biological Factorsmentioning

confidence: 99%

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Dullo¹,

Flögel²,

Rüggeberg³

2008

Mar. Ecol. Prog. Ser.

205

202

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“…1c). Today, this mound is covered by dead coral rubble in contrast to the flourishing coral ecosystems recorded on Thérèse Mound (Olu Le-Roy, 2004;de Mol et al, 2007) and Galway Mound (Foubert et al, 2005;Eisele et al, 2008) situated nearby but at deeper depth (Williams et al, 2006). The core was taken on the north-western tip of the summit off the mound flank facing the northward moving currents and it is situated next to the site of recent IODP drilling 307 (Fig.…”

Section: Core Locationsmentioning

confidence: 99%

The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

et al. 2009

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U-series dating of constructional cold-water corals is a powerful tool to reconstruct the evolution of corals on carbonate mounds. Here we have investigated the time framework of corals such as Lophelia pertusa and Madrepora oculata on five different mound settings of the eastern North Atlantic (on Rockall Bank and in Porcupine Seabight), sampled at variable depth and location (610-880 m water depth). We have found that the past 11 ka reflect a period generally favourable for coral development. We further determined local mound growth rates and identified mound surface erosion (framework collapse) during times of active coral framework construction. "Local" vertical mound growth rates vary between less than 5 cm ka − 1 and up to 220 cm ka − 1 . We interpret rates exceeding 15 cm ka − 1 as representative of densely populated coral reefs. During times of reduced or absent coral development, mound evolution rates are by far smaller (0 to < 5 cm ka − 1 ). The time resolution achieved here furthermore provides first evidence for reduced coral (ecosystem) activity at 1.8-2.0 ka, 4.2-4.8 ka and between 6 and 8.2 ka within the Holocene that may be related to climate driven changes of the coral growth environments. During Glacial periods coral growth in those areas seems apparently extremely reduced or is even absent on mounds.

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“…As well as providing spectacular imagery of the corals and revealing aspects of their biology, underwater video data offer a rapid, nondestructive method of sampling and in situ characterisation at remote locations. Several studies have described the extent of coral habitat specifically on carbonate mound features (Olu-Le Roy et al 2002, Foubert et al 2005a, Grehan et al 2005, which are considered to be particularly important in relation to cold-water coral ecosystems . The factors controlling cold-water coral distribution are only partially understood, but substrate type and hydrographic conditions influenced by seabed topography are considered to be important (Frederiksen et al 1992, Mortensen et al 2001, Reed et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Quantifying relationships between video observations of cold-water coral cover and seafloor features in Rockall Trough, west of Ireland

Guinan¹,

Grehan²,

Dolan³

et al. 2009

Mar. Ecol. Prog. Ser.

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Cold-water coral distributions are only partially understood even in the most wellstudied areas. This is partly due to the only recent development of appropriate technology, and partly to the high cost and time associated with coral mapping, particularly in deep water. One way to optimise mapping is to develop predictive habitat models as proxies for the actual distribution of corals. These models may provide objective criteria for the selection of prioritised coral mapping areas. In this study, we quantified the relationship between observed cold-water coral distribution and terrain attributes as an important step in developing predictive habitat models. We estimated deep-water coral percentage cover from remotely operated vehicle video and demonstrate how such data can be used to examine quantitative relations between coral cover and terrain parameters (slope, aspect, rugosity and bathymetric position index) derived from ship-borne multibeam swath acoustic data. We show that, at carbonate mound provinces within sites on the Irish margin, coral abundance is correlated with terrain that is strongly sloping and irregular to a varying degree, depending on spatial scale. It is likely that terrain variations influence the hydrodynamic setting, resulting in a varying food supply. A similar approach may be applicable for other fauna in a variety of benthic environments. KEY WORDS: Habitat mapping · Terrain analysis · Remotely operated vehicle · Carbonate moundsResale or republication not permitted without written consent of the publisher OPEN PEN

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New view of the Belgica Mounds, Porcupine Seabight, NE Atlantic: preliminary results from the Polarstern ARK-XIX/3a ROV cruise

Cited by 51 publications

References 17 publications

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

Cold-water coral growth in relation to the hydrography of the Celtic and Nordic European continental margin

The Holocene occurrence of cold water corals in the NE Atlantic: Implications for coral carbonate mound evolution

Quantifying relationships between video observations of cold-water coral cover and seafloor features in Rockall Trough, west of Ireland

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