scholarly journals Imprint of Holocene Climate Variability on Cold-Water Coral Reef Growth at the SW Rockall Trough Margin, NE Atlantic

2018 ◽  
Vol 19 (8) ◽  
pp. 2437-2452 ◽  
Author(s):  
Lucile Bonneau ◽  
Christophe Colin ◽  
Edwige Pons-Branchu ◽  
Furu Mienis ◽  
Nadine Tisnérat-Laborde ◽  
...  
Keyword(s):  
Coral Reef ◽  
Climate Variability ◽  
Cold Water ◽  
Reef Growth ◽  
Ne Atlantic ◽  
Holocene Climate ◽  
Rockall Trough ◽  
Water Coral

scholarly journals In situ growth and bioerosion rates of Lophelia pertusa in a Norwegian fjord and open shelf cold-water coral habitat

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7586 ◽  
Author(s):  
Janina V. Büscher ◽  
Max Wisshak ◽  
Armin U. Form ◽  
Jürgen Titschack ◽  
Kerstin Nachtigall ◽  
...  
Keyword(s):  
Coral Reef ◽  
Growth Rates ◽  
Environmental Changes ◽  
Cold Water ◽  
Lophelia Pertusa ◽  
Reef Growth ◽  
Dead Coral ◽  
Open Shelf ◽  
Water Coral

Coral reef resilience depends on the balance between carbonate precipitation, leading to reef growth, and carbonate degradation, for example, through bioerosion. Changes in environmental conditions are likely to affect the two processes differently, thereby shifting the balance between reef growth and degradation. In cold-water corals estimates of accretion-erosion processes in their natural habitat are scarce and solely live coral growth rates were studied with regard to future environmental changes in the laboratory so far, limiting our ability to assess the potential of cold-water coral reef ecosystems to cope with environmental changes. In the present study, growth rates of the two predominant colour morphotypes of live Lophelia pertusa as well as bioerosion rates of dead coral framework were assessed in different environmental settings in Norwegian cold-water coral reefs in a 1-year in situ experiment. Net growth (in weight gain and linear extension) of live L. pertusa was in the lower range of previous estimates and did not significantly differ between inshore (fjord) and offshore (open shelf) habitats. However, slightly higher net growth rates were obtained inshore. Bioerosion rates were significantly higher on-reef in the fjord compared to off-reef deployments in- and offshore. Besides, on-reef coral fragments yielded a broader range of individual growth and bioerosion rates, indicating higher turnover in live reef structures than off-reef with regard to accretion–bioerosion processes. Moreover, if the higher variation in growth rates represents a greater variance in (genetic) adaptations to natural environmental variability in the fjord, inshore reefs could possibly benefit under future ocean change compared to offshore reefs. Although not significantly different due to high variances between replicates, growth rates of orange branches were consistently higher at all sites, while mortality was statistically significantly lower, potentially indicating higher stress-resistance than the less pigmented white phenotype. Comparing the here measured rates of net accretion of live corals (regardless of colour morphotype) with net erosion of dead coral framework gives a first estimate of the dimensions of both processes in natural cold-water coral habitats, indicating that calcium carbonate loss through bioerosion amounts to one fifth to one sixth of the production rates by coral calcification (disregarding accretion processes of other organisms and proportion of live and dead coral framework in a reef). With regard to likely accelerating bioerosion and diminishing growth rates of corals under ocean acidification, the balance of reef accretion and degradation may be shifted towards higher biogenic dissolution in the future.

scholarly journals Environmental constraints on Holocene cold-water coral reef growth off Norway: Insights from a multiproxy approach

2016 ◽  
Vol 31 (10) ◽  
pp. 1350-1367 ◽  
Author(s):  
Jacek Raddatz ◽  
Volker Liebetrau ◽  
Julie Trotter ◽  
Andres Rüggeberg ◽  
Sascha Flögel ◽  
...  
Keyword(s):  
Coral Reef ◽  
Cold Water ◽  
Environmental Constraints ◽  
Reef Growth ◽  
Multiproxy Approach ◽  
Water Coral

Morphology and sedimentology of (clustered) cold-water coral mounds at the south Rockall Trough margins, NE Atlantic Ocean

Facies ◽  
2008 ◽  
Vol 55 (1) ◽  
pp. 1-26 ◽  
Author(s):  
Henk de Haas ◽  
Furu Mienis ◽  
Norbert Frank ◽  
Thomas O. Richter ◽  
Reinhold Steinacher ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Cold Water ◽  
Ne Atlantic ◽  
The South ◽  
Rockall Trough ◽  
Ne Atlantic Ocean ◽  
Water Coral

The sediment composition and predictive mapping of facies on the Propeller Mound—A cold-water coral mound (Porcupine Seabight, NE Atlantic)

2010 ◽  
Vol 30 (17) ◽  
pp. 1814-1829 ◽  
Author(s):  
Katrin Heindel ◽  
Jürgen Titschack ◽  
Boris Dorschel ◽  
Veerle A.I. Huvenne ◽  
André Freiwald
Keyword(s):  
Cold Water ◽  
Ne Atlantic ◽  
Sediment Composition ◽  
Predictive Mapping ◽  
Porcupine Seabight ◽  
Water Coral

scholarly journals <sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef

2012 ◽  
Vol 9 (3) ◽  
pp. 1253-1265 ◽  
Author(s):  
P. Sabatier ◽  
J.-L. Reyss ◽  
J. M. Hall-Spencer ◽  
C. Colin ◽  
N. Frank ◽  
...  
Keyword(s):  
Growth Rate ◽  
Coral Reef ◽  
Metal Oxides ◽  
Growth Rates ◽  
Cold Water ◽  
Age And Growth ◽  
Lophelia Pertusa ◽  
Fe Oxide ◽  
Oxide Contamination ◽  
Water Coral

Abstract. Here we show the use of the 210Pb-226Ra excess method to determine the growth rate of two corals from the world's largest known cold-water coral reef, Røst Reef, north of the Arctic circle off Norway. Colonies of each of the two species that build the reef, Lophelia pertusa and Madrepora oculata, were collected alive at 350 m depth using a submersible. Pb and Ra isotopes were measured along the major growth axis of both specimens using low level alpha and gamma spectrometry and trace element compositions were studied. 210Pb and 226Ra differ in the way they are incorporated into coral skeletons. Hence, to assess growth rates, we considered the exponential decrease of initially incorporated 210Pb, as well as the increase in 210Pb from the decay of 226Ra and contamination with 210Pb associated with Mn-Fe coatings that we were unable to remove completely from the oldest parts of the skeletons. 226Ra activity was similar in both coral species, so, assuming constant uptake of 210Pb through time, we used the 210Pb-226Ra chronology to calculate growth rates. The 45.5 cm long branch of M. oculata was 31 yr with an average linear growth rate of 14.4 ± 1.1 mm yr−1 (2.6 polyps per year). Despite cleaning, a correction for Mn-Fe oxide contamination was required for the oldest part of the colony; this correction corroborated our radiocarbon date of 40 yr and a mean growth rate of 2 polyps yr−1. This rate is similar to the one obtained in aquarium experiments under optimal growth conditions. For the 80 cm-long L. pertusa colony, metal-oxide contamination remained in both the middle and basal part of the coral skeleton despite cleaning, inhibiting similar age and growth rate estimates. The youngest part of the colony was free of metal oxides and this 15 cm section had an estimated a growth rate of 8 mm yr−1, with high uncertainty (~1 polyp every two to three years). We are less certain of this 210Pb growth rate estimate which is within the lowermost ranges of previous growth rate estimates. We show that 210Pb-226Ra dating can be successfully applied to determine the age and growth rate of framework-forming cold-water corals if Mn-Fe oxide deposits can be removed. Where metal oxides can be removed, large M. oculata and L. pertusa skeletons provide archives for studies of intermediate water masses with an up to annual time resolution and spanning over many decades.

scholarly journals Spatial Scales of Bacterial Diversity in Cold-Water Coral Reef Ecosystems

PLoS ONE ◽  
2012 ◽  
Vol 7 (3) ◽  
pp. e32093 ◽  
Author(s):  
Sandra Schöttner ◽  
Christian Wild ◽  
Friederike Hoffmann ◽  
Antje Boetius ◽  
Alban Ramette
Keyword(s):  
Coral Reef ◽  
Bacterial Diversity ◽  
Cold Water ◽  
Spatial Scales ◽  
Coral Reef Ecosystems ◽  
Water Coral
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