Mid-Holocene extinction of cold-water corals on the Namibian shelf steered by the Benguela oxygen minimum zone

Geology ◽  
2019 ◽  
Vol 47 (12) ◽  
pp. 1185-1188 ◽  
Author(s):  
Leonardo Tamborrino ◽  
Claudia Wienberg ◽  
Jürgen Titschack ◽  
Paul Wintersteller ◽  
Furu Mienis ◽  
...  
Keyword(s):  
Cold Water ◽  
Oxygen Minimum Zone ◽  
Uranium Series ◽  
Uranium Series Dating ◽  
Benguela Upwelling ◽  
Minimum Zone ◽  
Water Depths ◽  
Oxygen Minimum ◽  
Water Coral ◽  
Southeastern Atlantic

Abstract An exceptionally large cold-water coral mound province (CMP) was recently discovered extending over 80 km along the Namibian shelf (offshore southwestern Africa) in water depths of 160–270 m. This hitherto unknown CMP comprises >2000 mounds with heights of up to 20 m and constitutes the largest CMP known from the southeastern Atlantic Ocean. Uranium-series dating revealed a short but intense pulse in mound formation during the early to mid-Holocene. Coral proliferation during this period was potentially supported by slightly enhanced dissolved oxygen concentrations compared to the present Benguela oxygen minimum zone (OMZ). The subsequent mid-Holocene strengthening of the Benguela Upwelling System and a simultaneous northward migration of the Angola-Benguela Front resulted in an intensification of the OMZ that caused the sudden local extinction of the Namibian corals and prevented their reoccurrence until today.

scholarly journals Benthic Foraminifera from Middle to Late Pleistocene, coastal upwelling sediments of ODP Hole 686B, Pacific Ocean, off Peru

1991 ◽  
Vol 9 (2) ◽  
pp. 153-158 ◽  
Author(s):  
Kathryn A. Malmgren ◽  
Brian M. Funnell
Keyword(s):  
Late Pleistocene ◽  
Surface Waters ◽  
Benthic Foraminifera ◽  
Bottom Water ◽  
Coastal Upwelling ◽  
Oxygen Minimum Zone ◽  
Water Oxygen ◽  
Minimum Zone ◽  
Water Depths ◽  
Oxygen Minimum

Abstract. Benthic Foraminifera from middle to late Pleistocene, (c. 600ka to 0ka), sediments of ODP Hole 686B, off Peru, show highest abundances and diversities during periods of cooler surface waters, (inferred from the Uk37 index), and enhanced upwelling, (inferred from the peridinacean/gonyaulacacean dinoflagellate cyst ratio). During the latest Pleistocene, (c. 160ka to 0ka), these periods are characterised by higher organic carbon contents in the bottom sediments, and occur during the odd-numbered, interglacial_18O stages. The benthic Foraminifera indicate deposition in 120 to 250 metres water depth for the earlier part of the record, (c. 600ka to c. 200ka), within the oxygen-minimum zone, with bottom water oxygen contents of <0.5 to 0.2 ml/l, (inferred from the dominance of Bolivinellina humilis). Deposition in water depths approaching those of the present day, (c. 450 metres), is indicated from c. 160ka onwards, with better oxygenated bottom water conditions, probably corresponding to the lower part of the oxygen-minimum zone.

Temporally invariable bacterial community structure in the Arabian Sea oxygen minimum zone

2014 ◽  
Vol 73 (1) ◽  
pp. 51-67 ◽  
Author(s):  
A Jain ◽  
M Bandekar ◽  
J Gomes ◽  
D Shenoy ◽  
RM Meena ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

The effects of submarine canyons and the oxygen minimum zone on deep-sea fish assemblages off Hawai'i

2012 ◽  
Vol 64 ◽  
pp. 54-70 ◽  
Author(s):  
Fabio C. De Leo ◽  
Jeffrey C. Drazen ◽  
Eric W. Vetter ◽  
Ashley A. Rowden ◽  
Craig R. Smith
Keyword(s):  
Deep Sea ◽  
Fish Assemblages ◽  
Oxygen Minimum Zone ◽  
Submarine Canyons ◽  
Minimum Zone ◽  
Sea Fish ◽  
Oxygen Minimum

Abundance and distribution of diverse membrane-bound monooxygenase (Cu-MMO) genes within the Costa Rica oxygen minimum zone

2013 ◽  
Vol 5 (3) ◽  
pp. 414-423 ◽  
Author(s):  
Patricia L. Tavormina ◽  
William Ussler ◽  
Joshua A. Steele ◽  
Stephanie A. Connon ◽  
Martin G. Klotz ◽  
...  
Keyword(s):  
Costa Rica ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Membrane Bound ◽  
Abundance And Distribution ◽  
Oxygen Minimum
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