Temporal and spatial distributions of cold-water corals in the Drake Passage: Insights from the last 35,000 years

Margolin, Andrew R.; Robinson, Laura F.; Burke, Andrea; Waller, Rhian G.; Scanlon, Kathryn M.; Roberts, M.L.; Auro, Maureen E.; Flierdt, Tina van de

doi:10.1016/j.dsr2.2013.06.008

Cited by 42 publications

(50 citation statements)

References 80 publications

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“…The Tasmania SAZ coral δ 15 N record is further corroborated by the coral δ 15 N compilation from the DP SAZ. In the DP SAZ, no D. dianthus older than ∼17 kyr were found (21). Nevertheless, coral δ 15 N also shows a 3.5-4.0‰ decrease from ∼15 kyr to the late Holocene (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Deep-sea fossil corals in the DP were collected by dredge or trawl (21), whereas a deep submergence vehicle was used to collect coral samples from the Tasmanian seamounts (28). Detailed information on all coral samples used in this study is given in refs.…”

Section: Methodsmentioning

confidence: 99%

“…29 and 30. The calendar age was calculated from the measured radiocarbon content and an estimated reservoir age (15,16,21,28).…”

Section: Methodsmentioning

confidence: 99%

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Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age

Wang

Sigman

Prokopenko

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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The Southern Ocean regulates the ocean’s biological sequestration of CO2 and is widely suspected to underpin much of the ice age decline in atmospheric CO2 concentration, but the specific changes in the region are debated. Although more complete drawdown of surface nutrients by phytoplankton during the ice ages is supported by some sediment core-based measurements, the use of different proxies in different regions has precluded a unified view of Southern Ocean biogeochemical change. Here, we report measurements of the 15N/14N of fossil-bound organic matter in the stony deep-sea coral Desmophyllum dianthus, a tool for reconstructing surface ocean nutrient conditions. The central robust observation is of higher 15N/14N across the Southern Ocean during the Last Glacial Maximum (LGM), 18–25 thousand years ago. These data suggest a reduced summer surface nitrate concentration in both the Antarctic and Subantarctic Zones during the LGM, with little surface nitrate transport between them. After the ice age, the increase in Antarctic surface nitrate occurred through the deglaciation and continued in the Holocene. The rise in Subantarctic surface nitrate appears to have had both early deglacial and late deglacial/Holocene components, preliminarily attributed to the end of Subantarctic iron fertilization and increasing nitrate input from the surface Antarctic Zone, respectively

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age

Wang

Sigman

Prokopenko

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Our results suggest that density, pH, oxygen concentration and the quantity of hard substrate available for settlement are less important for D. dianthus than for other CWC species (e.g., Davies et al, 2008; Dullo, Flögel & Rüggeberg, 2008; Fink et al, 2012). Nevertheless, fossil records of D. dianthus in the North Atlantic (Robinson et al, 2007; Thiagarajan et al, 2013), Tasmanian Seamounts (Thiagarajan et al, 2013), and Drake Passage (Burke et al, 2010; Margolin et al, 2013) display changes in the distribution of this scleractinian, most likely due to variations in the surface productivity, the subsurface oxygen concentration and the seawater carbonate chemistry caused by climate-induced modifications of the ocean circulation. The ubiquity of D. dianthus in Comau Fjord demonstrates that no threshold in any of the environmental parameters is crossed there that would completely prevent recruitment, growth or survival of the coral.…”

Section: Discussionmentioning

confidence: 99%

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Fillinger

Richter

2013

PeerJ

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Cold-water corals provide an important habitat for a rich fauna along the continental margins and slopes. Although these azooxanthellate corals are considered particularly sensitive to ocean acidification, their responses to natural variations in pH and aragonite saturation are largely unknown due to the difficulty of studying their ecology in deep waters. Previous SCUBA investigations have shown an exceptionally shallow population of the cold-water coral Desmophyllum dianthus in near-surface waters of Comau Fjord, a stratified 480 m deep basin in northern Chilean Patagonia with suboxic deep waters. Here, we use a remotely operated vehicle to quantitatively investigate the distribution of D. dianthus and its physico-chemical drivers in so far uncharted naturally acidified waters. Remarkably, D. dianthus was ubiquitous throughout the fjord, but particularly abundant between 20 and 280 m depth in a pH range of 8.4 to 7.4. The persistence of individuals in aragonite-undersaturated waters suggests that present-day D. dianthus in Comau Fjord may show pre-acclimation or pre-adaptation to conditions of ocean acidification predicted to reach over 70% of the known deep-sea coral locations by the end of the century.

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“…Among them, Antarctic scleractinians are well-studied organisms that comprise about 17 species distributed mostly off continental Antarctica and the Antarctic archipelagos (Cairns 1982(Cairns , 1990. Additional species have been recorded and described for sub-Antarctic waters in southern South America, Drake Passage and New Zealand (Cairns 1982(Cairns , 1995(Cairns , 2007Cairns & Polonio 2013;Margolin et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Scleractinian corals recorded in the Argentinean Antarctic expeditions between 2012 and 2014, with comments on Flabellum (Flabellum) areum Cairns, 1982

2016

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Temporal and spatial distributions of cold-water corals in the Drake Passage: Insights from the last 35,000 years

Cited by 42 publications

References 80 publications

Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age

Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Scleractinian corals recorded in the Argentinean Antarctic expeditions between 2012 and 2014, with comments on Flabellum (Flabellum) areum Cairns, 1982

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