The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Huvenne, Veerle; Beyer, A.; Haas, H. de; Dekindt, K.; Henriet, Jean‐Pierre; Kozachenko, M.; Olu, Karine; Wheeler, Andrew J.

doi:10.1007/3-540-27673-4_27

Cited by 54 publications

(63 citation statements)

References 32 publications

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“…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%

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.

204

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: 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.

204

202

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“…Situated in the Magellan Mound province mainly consisting of buried mounds (de Mol et al, 2002;Huvenne et al, 2005), this mound is one of few to reach above the sea floor. It has a southwest-northeast elongated shape and an active coral fauna of Lophelia pertusa and Desmophyllum dianthus corals (Olu Le-Roy, 2004;Huvenne et al, 2005) (Fig. 1b).…”

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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“…Bathymetric information, kindly provided by the Geological Survey of Ireland (GSI Dublin) was used to localize the cores in the Magellan mound area. Sidescan sonar imagery has been acquired during the TOBI survey covering the Magellan and Belgica mound provinces (RV Pelagia cruise) with a 30 kHz sidescan sonar mounted on the TOBI vehicle (de Haas et al 2002;Huvenne et al 2005).…”

Section: Geophysical Datamentioning

confidence: 99%

X-ray imagery and physical core logging as a proxy of the content of sediment cores in cold-water coral mound provinces: a case study from Porcupine Seabight, SW of Ireland

Foubert

Rooij

Blamart

et al. 2006

Int J Earth Sci (Geol Rundsch)

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Three provinces, characterized by the presence of carbonate mounds interpreted as coldwater coral banks have been reported in Porcupine Seabight, SW of Ireland and were recently subjected to many detailed studies. This contribution discusses the use of X-ray imagery and physical properties in deciphering palaeoceanographic, sedimentological and biological processes. Physical property core logging and X-ray imagery are used to identify and describe sedimentation regimes and so their respective palaeoceanographic and palaeoclimatological settings in two mound provinces, respectively the Belgica mound province and the Magellan mound province. Both provinces show at present time clear differences in the hydrodynamic environment. This study confirms that also during the past the oceanographic and sedimentological environment of both provinces differ clearly. Impacts of glacial-interglacial variations and locally derived ice rafting events (IRE), comparable with the North Atlantic Heinrich events (HE) have been recognized in both provinces. Moreover, the combination of X-ray imagery, magnetic susceptibility, gamma density and P-wave velocity makes it possible to estimate the coral content and coral distribution in unopened cores localized on top of carbonate mounds. A comparison between on-mound and off-mound cores in both provinces allowed revealing some mechanisms of mound evolution and coral growth versus time.

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The seabed appearance of different coral bank provinces in the Porcupine Seabight, NE Atlantic: results from sidescan sonar and ROV seabed mapping

Cited by 54 publications

References 32 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

X-ray imagery and physical core logging as a proxy of the content of sediment cores in cold-water coral mound provinces: a case study from Porcupine Seabight, SW of Ireland

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