Ian R. MacDonald

Florida State University

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Gerhard Bohrmann

University of Bremen

Samantha B. Joye

University of Georgia

Norman L. Guinasso

Texas A&M University

Roger Sassen

Texas A&M University

Oscar Garcia‐Pineda

Gulf Marine Institute of Technology

William W. Sager

University of Houston

Samira Daneshgar Asl

University of California, Santa Barbara

Ira Leifer

SRI International

Thomas Naehr

University of the Pacific

Michael B. Peccini

National Oceanic and Atmospheric Administration

Cooperative Institutions

Texas A&M University

University of Bremen

Florida State University

GEOMAR Helmholtz Centre for Ocean Research Kiel

Mitchell Institute

Texas A&M University – Corpus Christi

Woods Hole Oceanographic Institution

Universidad Nacional Autónoma de México

Pennsylvania State University

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

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Coral injuries observed at Mesophotic Reefs after the Deepwater Horizon oil discharge

Deep Sea Research Part II Topical Studies in Oceanography (2015)

Maurício Silva Peter J. Etnoyer Ian R. MacDonald

Gorgonian

Smothering

Echinoderm

10.1016/j.dsr2.2015.05.013

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Citations (51)

Considerable methane fluxes to the atmosphere from hydrocarbon seeps in the Gulf of Mexico

Nature Geoscience (2009)

Evan A. Solomon Miriam Kastner Ian R. MacDonald Ira Leifer

Atmospheric methane

Petroleum seep

10.1038/ngeo574

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Citations (190)

Correspondence of sea fan orientations with measured currents on hard bottom habitats of the Mississippi/Alabama continental shelf

Continental Shelf Research (2007)

Michael B. Peccini Ian R. MacDonald

Gorgonian

10.1016/j.csr.2007.08.003

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Citations (11)

Diversity of the arctic deep-sea benthos

Marine Biodiversity (2011)

Bodil A. Bluhm William G. Ambrose Melanie Bergmann Lisa M. Clough Andrey Gebruk

A benthic species inventory of 1,125 taxa was compiled from various sources for the central Arctic deeper than 500 m, and bounded to the Atlantic by Fram Strait. The inventory was dominated by arthropods (366 taxa), foraminiferans (197), annelids (194), and nematodes (140). An additional 115 taxa were added from the Greenland–Iceland–Norwegian Seas (GIN). Approximately half of all taxa were recorded from only 1 or 2 locations. A large overlap in taxa with Arctic shelf species supports previous findings that part of the deep-sea fauna originates from shelf species. Macrofaunal abundance, meiofaunal abundance and macrofaunal biomass decreased significantly with water depth. Robust diversity indices could only be calculated for the polychaetes, for which S, ES(20), H' and Delta+ decreased significantly with water depth, and all but ES(20) decreased slightly with latitude. Species evenness increased with depth and latitude. No mid-depth peak in species richness was observed. Multivariate analysis of the Eurasian, Amerasian and GIN Seas polychaete occurrences revealed a strong Atlantic influence, the absence of modern Pacific fauna, and the lack of a barrier effect by mid-Arctic ridges. Regional differences appear to be moderate on the species level and minor on the family level, although the analysis was confounded by a lack of methodological standardization and inconsistent taxonomic resolution. Future efforts should use more consistent methods to observe temporal trends and help fill the largest sampling gaps (i.e. eastern Canada Basin, depths >3,000 m, megafauna) to address how climate warming, and the shrinking of the perennial ice cover will alter deep-sea communities.

Benthos

Megafauna

10.1007/s12526-010-0078-4

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Citations (100)

Application of the automatic seep location estimator (ASLE) with the use of contextual information for estimating offshore oil seeps

Remote Sensing Applications Society and Environment (2016)

Gopika Suresh Christian Melsheimer Ian R. MacDonald Justus Notholt Gerhard Bohrmann

Petroleum seep

10.1016/j.rsase.2016.11.005

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Citations (3)

Gas hydrate that breaches the sea floor on the continental slope of the Gulf of Mexico

Geology (1994)

Ian R. MacDonald Norman L. Guinasso Roger Sassen John M. Brooks L. Lee

We report observations that concern formation and dissociation of gas hydrate near the sea floor at depths of ∼540 m in the northern Gulf of Mexico. In August 1992, three lobes of gas hydrate were partly exposed beneath a thin layer of sediment. By May 1993, the most prominent lobe had evidently broken free and floated away, leaving a patch of disturbed sediment and exposed hydrate. The underside of the gas hydrate was about 0.2 °C warmer than ambient sea water and had trapped a large volume of oil and free gas. An in situ monitoring device, deployed on a nearby bed of mussels, recorded sustained releases of gas during a 44 day monitoring period. Gas venting coincided with a temporary rise in water temperature of 1 °C, which is consistent with thermally induced dissociation of hydrate composed mainly of methane and water. We conclude that the effects of accumulating buoyant force and fluctuating water temperature cause shallow gas hydrate alternately to check and release gas venting.

Seabed

Clathrate hydrate

10.1130/0091-7613(1994)022<0699:ghtbts>2.3.co;2

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Citations (311)

Biogeochemical controls on authigenic carbonate formation at the Chapopote “asphalt volcano”, Bay of Campeche

Chemical Geology (2009)

Thomas Naehr Daniel Birgel Gerhard Bohrmann Ian R. MacDonald Sabine Kasten

Authigenic

Seafloor Spreading

Petroleum seep

10.1016/j.chemgeo.2009.07.002