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  • 1
    Publication Date: 2022-05-25
    Description: © International Society for Microbial Ecology, 2011. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in The ISME Journal 5 (2011): 1748–1758, doi:10.1038/ismej.2011.48.
    Description: A novel hydrothermal field has been discovered at the base of Lōihi Seamount, Hawaii, at 5000 mbsl. Geochemical analyses demonstrate that ‘FeMO Deep’, while only 0.2 °C above ambient seawater temperature, derives from a distal, ultra-diffuse hydrothermal source. FeMO Deep is expressed as regional seafloor seepage of gelatinous iron- and silica-rich deposits, pooling between and over basalt pillows, in places over a meter thick. The system is capped by mm to cm thick hydrothermally derived iron-oxyhydroxide- and manganese-oxide-layered crusts. We use molecular analyses (16S rDNA-based) of extant communities combined with fluorescent in situ hybridizations to demonstrate that FeMO Deep deposits contain living iron-oxidizing Zetaproteobacteria related to the recently isolated strain Mariprofundus ferroxydans. Bioenergetic calculations, based on in-situ electrochemical measurements and cell counts, indicate that reactions between iron and oxygen are important in supporting chemosynthesis in the mats, which we infer forms a trophic base of the mat ecosystem. We suggest that the biogenic FeMO Deep hydrothermal deposit represents a modern analog for one class of geological iron deposits known as ‘umbers’ (for example, Troodos ophilolites, Cyprus) because of striking similarities in size, setting and internal structures.
    Description: Funding has been provided by the NSF Microbial Observatories Program (KJE, DE, BT, HS and CM), by the Gordon and Betty Moore Foundation (KJE), the College of Letters, Arts, and Sciences at the University of Southern California (KJE) and by the NASA Astrobiology Institute (KJE, DE).
    Keywords: Geomicrobiology ; Deep biosphere ; Hydrothermal ; Iron bacteria ; Iron oxidation
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/vnd.ms-excel
    Format: application/pdf
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  • 2
    Publication Date: 2012-03-03
    Description: Ocean acidification may have severe consequences for marine ecosystems; however, assessing its future impact is difficult because laboratory experiments and field observations are limited by their reduced ecologic complexity and sample period, respectively. In contrast, the geological record contains long-term evidence for a variety of global environmental perturbations, including ocean acidification plus their associated biotic responses. We review events exhibiting evidence for elevated atmospheric CO(2), global warming, and ocean acidification over the past ~300 million years of Earth's history, some with contemporaneous extinction or evolutionary turnover among marine calcifiers. Although similarities exist, no past event perfectly parallels future projections in terms of disrupting the balance of ocean carbonate chemistry-a consequence of the unprecedented rapidity of CO(2) release currently taking place.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Honisch, Barbel -- Ridgwell, Andy -- Schmidt, Daniela N -- Thomas, Ellen -- Gibbs, Samantha J -- Sluijs, Appy -- Zeebe, Richard -- Kump, Lee -- Martindale, Rowan C -- Greene, Sarah E -- Kiessling, Wolfgang -- Ries, Justin -- Zachos, James C -- Royer, Dana L -- Barker, Stephen -- Marchitto, Thomas M Jr -- Moyer, Ryan -- Pelejero, Carles -- Ziveri, Patrizia -- Foster, Gavin L -- Williams, Branwen -- New York, N.Y. -- Science. 2012 Mar 2;335(6072):1058-63. doi: 10.1126/science.1208277.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA. hoenisch@ldeo.columbia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22383840" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Aquatic Organisms ; Atmosphere ; Carbon Dioxide ; Carbonates/analysis ; *Ecosystem ; Extinction, Biological ; Forecasting ; Fossils ; *Geological Phenomena ; Hydrogen-Ion Concentration ; Oceans and Seas ; Seawater/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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