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• {"link"=>{"url"=>"http://www.citeulike.org/user/mva/article/13143595"}, "post_time"=>"2014-04-21 23:30:07", "tag"=>"no-tag", "linkout"=>{"type"=>"DOI", "url"=>"http://dx.doi.org/10.1371/journal.pone.0047887"}, "username"=>"mva", "article_id"=>"13143595"}

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{"title"=>"An Unaccounted Fraction of Marine Biogenic CaCO3Particles", "type"=>"journal", "authors"=>[{"first_name"=>"Mikal", "last_name"=>"Heldal", "scopus_author_id"=>"7003541552"}, {"first_name"=>"Svein", "last_name"=>"Norland", "scopus_author_id"=>"6603916014"}, {"first_name"=>"Egil S.", "last_name"=>"Erichsen", "scopus_author_id"=>"6602188701"}, {"first_name"=>"T. Frede", "last_name"=>"Thingstad", "scopus_author_id"=>"55909258100"}, {"first_name"=>"Gunnar", "last_name"=>"Bratbak", "scopus_author_id"=>"56000207600"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"23110119", "sgr"=>"84867866390", "doi"=>"10.1371/journal.pone.0047887", "scopus"=>"2-s2.0-84867866390", "pui"=>"365919053", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "issn"=>"19326203"}, "id"=>"a555733a-9eac-3e8d-9e77-0c482bc3eb3a", "abstract"=>"Biogenic production and sedimentation of calcium carbonate in the ocean, referred to as the carbonate pump, has profound implications for the ocean carbon cycle, and relate both to global climate, ocean acidification and the geological past. In marine pelagic environments coccolithophores, foraminifera and pteropods have been considered the main calcifying organisms. Here, we document the presence of an abundant, previously unaccounted fraction of marine calcium carbonate particles in seawater, presumably formed by bacteria or in relation to extracellular polymeric substances. The particles occur in a variety of different morphologies, in a size range from <1 to >100 µm, and in a typical concentration of 10(4)-10(5) particles L(-1) (size range counted 1-100 µm). Quantitative estimates of annual averages suggests that the pure calcium particles we counted in the 1-100 µm size range account for 2-4 times more CaCO(3) than the dominating coccolithophoride Emiliania huxleyi and for 21% of the total concentration of particulate calcium. Due to their high density, we hypothesize that the particles sediment rapidly, and therefore contribute significantly to the export of carbon and alkalinity from surface waters. The biological and environmental factors affecting the formation of these particles and possible impact of this process on global atmospheric CO(2) remains to be investigated.", "link"=>"http://www.mendeley.com/research/unaccounted-fraction-marine-biogenic-caco3particles", "reader_count"=>39, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>1, "Researcher"=>9, "Student > Ph. D. Student"=>15, "Student > Postgraduate"=>3, "Student > Master"=>5, "Other"=>3, "Student > Bachelor"=>1, "Professor"=>1, "Unspecified"=>1}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>1, "Researcher"=>9, "Student > Ph. D. Student"=>15, "Student > Postgraduate"=>3, "Student > Master"=>5, "Other"=>3, "Student > Bachelor"=>1, "Professor"=>1, "Unspecified"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>2, "Engineering"=>1, "Environmental Science"=>7, "Biochemistry, Genetics and Molecular Biology"=>1, "Agricultural and Biological Sciences"=>15, "Earth and Planetary Sciences"=>13}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>13}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>15}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>2}, "Environmental Science"=>{"Environmental Science"=>7}}, "reader_count_by_country"=>{"Belgium"=>2, "Brazil"=>1, "United Kingdom"=>3, "Germany"=>1}, "group_count"=>1}

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• http://doi.org/10.3389/fmicb.2018.00998
• http://doi.org/10.1002/2016GB005372
• http://doi.org/10.1017/S0025315413000635
• http://doi.org/10.3389/fmicb.2017.00602
• http://doi.org/10.5194/bg-16-949-2019
• http://doi.org/10.1007/s10126-014-9566-z
• http://doi.org/10.1016/j.marchem.2017.07.001

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• {"id"=>"260965293839507456", "text"=>"we don't know where all marine biogenic CaCO3 particles come from http://t.co/Pu56xZYU", "created_at"=>"2012-10-24T04:45:49Z", "user"=>"MarBiolNews", "user_name"=>"MarineBiologyNews", "user_profile_image"=>"http://a0.twimg.com/profile_images/2732584321/675ea871bf7c403cd933fb6498b0282e_normal.jpeg"}
• {"id"=>"263512318925758464", "text"=>"Where does all the marine calcium carbonate come from? http://t.co/ojIdQTxN", "created_at"=>"2012-10-31T05:26:47Z", "user"=>"MarBiolNews", "user_name"=>"MarineBiologyNews", "user_profile_image"=>"http://a0.twimg.com/profile_images/2732584321/675ea871bf7c403cd933fb6498b0282e_normal.jpeg"}

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• {"files"=>["https://ndownloader.figshare.com/files/555196"], "description"=>"<p>Samples were collected at 5 m depth in Raunefjorden, a coastal sampling station south of Bergen, Norway. A) Calcium in the coccolithophore <i>Emiliania huxleyi</i> and in Ca particles estimated from scanning electron microscope counts. B) Total particulate Ca concentration measured by X-ray fluorescence (error bars are SE, n = 3–4) and chl <i>a</i> concentration. Hydrographical data and chl <i>a</i> profiles are shown in <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0047887#pone.0047887.s004\" target=\"_blank\">Fig. S4</a>.</p>", "links"=>[], "tags"=>["particles", "chl"], "article_id"=>225694, "categories"=>["Inorganic Chemistry", "Chemistry", "Microbiology"], "users"=>["Mikal Heldal", "Svein Norland", "Egil S. Erichsen", "T. Frede Thingstad", "Gunnar Bratbak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0047887.g002", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_annual_variation_in_CaCO_3_particles_and_chl_a_/225694", "title"=>"The annual variation in CaCO₃ particles and chl <i>a.</i>", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-23 01:34:54"}
• {"files"=>["https://ndownloader.figshare.com/files/555084"], "description"=>"<p>Samples were collected at 5 m depth in Raunefjorden, a coastal sampling station south of Bergen, Norway. A and B) Particles resembling bacteria and microcolonies of bacteria. B and D) Particles similar to the Ca carbonates described to precipitate on the cell surface of cultured marine bacteria. E and F) Particles with one flat surface suggesting that they are formed on a surface or interface. G and H) Particles with rhombohedral shape. I and J) Baton like particles resembling Bahaman ooids. All scale bars are 2 µm except in d) where it is 1 µm and f) where it is 10 µm.</p>", "links"=>[], "tags"=>["electron", "microscope", "images", "calcium", "particles"], "article_id"=>225571, "categories"=>["Inorganic Chemistry", "Chemistry", "Microbiology"], "users"=>["Mikal Heldal", "Svein Norland", "Egil S. Erichsen", "T. Frede Thingstad", "Gunnar Bratbak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0047887.g001", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Scanning_electron_microscope_images_of_marine_calcium_particles_with_different_morphology_/225571", "title"=>"Scanning electron microscope images of marine calcium particles with different morphology.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-23 01:32:51"}
• {"files"=>["https://ndownloader.figshare.com/files/295692", "https://ndownloader.figshare.com/files/295836", "https://ndownloader.figshare.com/files/295928", "https://ndownloader.figshare.com/files/296014", "https://ndownloader.figshare.com/files/296069", "https://ndownloader.figshare.com/files/296162", "https://ndownloader.figshare.com/files/296223", "https://ndownloader.figshare.com/files/296271", "https://ndownloader.figshare.com/files/296317", "https://ndownloader.figshare.com/files/296349"], "description"=>"<div><p>Biogenic production and sedimentation of calcium carbonate in the ocean, referred to as the carbonate pump, has profound implications for the ocean carbon cycle, and relate both to global climate, ocean acidification and the geological past. In marine pelagic environments coccolithophores, foraminifera and pteropods have been considered the main calcifying organisms. Here, we document the presence of an abundant, previously unaccounted fraction of marine calcium carbonate particles in seawater, presumably formed by bacteria or in relation to extracellular polymeric substances. The particles occur in a variety of different morphologies, in a size range from <1 to >100 µm, and in a typical concentration of 10⁴–10⁵ particles L⁻¹ (size range counted 1–100 µm). Quantitative estimates of annual averages suggests that the pure calcium particles we counted in the 1–100 µm size range account for 2–4 times more CaCO₃ than the dominating coccolithophoride <em>Emiliania huxleyi</em> and for 21% of the total concentration of particulate calcium. Due to their high density, we hypothesize that the particles sediment rapidly, and therefore contribute significantly to the export of carbon and alkalinity from surface waters. The biological and environmental factors affecting the formation of these particles and possible impact of this process on global atmospheric CO₂ remains to be investigated.</p> </div>", "links"=>[], "tags"=>["unaccounted", "biogenic", "particles"], "article_id"=>118244, "categories"=>["Inorganic Chemistry", "Chemistry", "Microbiology"], "users"=>["Mikal Heldal", "Svein Norland", "Egil S. Erichsen", "T. Frede Thingstad", "Gunnar Bratbak"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0047887.s001", "https://dx.doi.org/10.1371/journal.pone.0047887.s002", "https://dx.doi.org/10.1371/journal.pone.0047887.s003", "https://dx.doi.org/10.1371/journal.pone.0047887.s004", "https://dx.doi.org/10.1371/journal.pone.0047887.s005", "https://dx.doi.org/10.1371/journal.pone.0047887.s006", "https://dx.doi.org/10.1371/journal.pone.0047887.s007", "https://dx.doi.org/10.1371/journal.pone.0047887.s008", "https://dx.doi.org/10.1371/journal.pone.0047887.s009", "https://dx.doi.org/10.1371/journal.pone.0047887.s010"], "stats"=>{"downloads"=>5, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/An_Unaccounted_Fraction_of_Marine_Biogenic_CaCO_3_Particles/118244", "title"=>"An Unaccounted Fraction of Marine Biogenic CaCO₃ Particles", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2012-10-23 02:17:24"}

PMC Usage Stats | Further Information

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Relative Metric

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F1000Prime