Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities
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{"title"=>"Iron limitation modulates ocean acidification effects on Southern Ocean phytoplankton communities", "type"=>"journal", "authors"=>[{"first_name"=>"Clara J.M.", "last_name"=>"Hoppe", "scopus_author_id"=>"35743184900"}, {"first_name"=>"Christel S.", "last_name"=>"Hassler", "scopus_author_id"=>"8698731800"}, {"first_name"=>"Christopher D.", "last_name"=>"Payne", "scopus_author_id"=>"12780695500"}, {"first_name"=>"Philippe D.", "last_name"=>"Tortell", "scopus_author_id"=>"6603447328"}, {"first_name"=>"Björn R.", "last_name"=>"Rost", "scopus_author_id"=>"56248907700"}, {"first_name"=>"Scarlett", "last_name"=>"Trimborn", "scopus_author_id"=>"12445691900"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"sgr"=>"84891920515", "doi"=>"10.1371/journal.pone.0079890", "pui"=>"372425572", "issn"=>"19326203", "pmid"=>"24278207", "isbn"=>"1932-6203", "scopus"=>"2-s2.0-84891920515"}, "id"=>"fda34f44-e555-36ff-b218-71487479c02c", "abstract"=>"The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a long-term incubation experiment investigating the combined effects of CO2 and Fe availability on natural phytoplankton assemblages from the Weddell Sea, Antarctica. Active Chl a fluorescence measurements revealed that we successfully cultured phytoplankton under both Fe-depleted and Fe-enriched conditions. Fe treatments had significant effects on photosynthetic efficiency (Fv/Fm; 0.3 for Fe-depleted and 0.5 for Fe-enriched conditions), non-photochemical quenching (NPQ), and relative electron transport rates (rETR). pCO2 treatments significantly affected NPQ and rETR, but had no effect on Fv/Fm. Under Fe limitation, increased pCO2 had no influence on C fixation whereas under Fe enrichment, primary production increased with increasing pCO2 levels. These CO2-dependent changes in productivity under Fe-enriched conditions were accompanied by a pronounced taxonomic shift from weakly to heavily silicified diatoms (i.e. from Pseudo-nitzschia sp. to Fragilariopsis sp.). Under Fe-depleted conditions, this functional shift was absent and thinly silicified species dominated all pCO2 treatments (Pseudo-nitzschia sp. and Synedropsis sp. for low and high pCO2, respectively). Our results suggest that Ocean Acidification could increase primary productivity and the abundance of heavily silicified, fast sinking diatoms in Fe-enriched areas, both potentially leading to a stimulation of the biological pump. Over much of the SO, however, Fe limitation could restrict this possible CO2 fertilization effect.", "link"=>"http://www.mendeley.com/research/iron-limitation-modulates-ocean-acidification-effects-southern-ocean-phytoplankton-communities", "reader_count"=>103, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Researcher"=>20, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>34, "Student > Postgraduate"=>4, "Student > Master"=>13, "Other"=>10, "Student > Bachelor"=>10, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Researcher"=>20, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>34, "Student > Postgraduate"=>4, "Student > Master"=>13, "Other"=>10, "Student > Bachelor"=>10, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Environmental Science"=>24, "Biochemistry, Genetics and Molecular Biology"=>6, "Agricultural and Biological Sciences"=>37, "Arts and Humanities"=>1, "Veterinary Science and Veterinary Medicine"=>1, "Physics and Astronomy"=>1, "Psychology"=>1, "Chemistry"=>1, "Earth and Planetary Sciences"=>28}, "reader_count_by_subdiscipline"=>{"Chemistry"=>{"Chemistry"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Psychology"=>{"Psychology"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>28}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>37}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>6}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>24}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Veterinary Science and Veterinary Medicine"=>{"Veterinary Science and Veterinary Medicine"=>1}}, "reader_count_by_country"=>{"Colombia"=>1, "Canada"=>1, "United States"=>4, "Egypt"=>1, "Brazil"=>1, "United Kingdom"=>1, "Chile"=>1, "France"=>1, "Australia"=>1, "Spain"=>2}, "group_count"=>2}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1289924"], "description"=>"<p>NPP [nmol C (µmol POC)<sup>−1</sup> h<sup>−1</sup>] was estimated from <sup>14</sup>C incubations over 24 h as a function of pCO<sub>2</sub> [μatm]. Black and grey bars indicate Fe-enriched (solid bars) and -depleted treatments (open bars), respectively (n = 3; mean ± s.d.). ANOVA analysis revealed significant effects of pCO<sub>2</sub> levels as well as a significant interaction term of [Fe] and pCO<sub>2</sub> levels (F<sub>[Fe]</sub> = 0.01, p<sub>[Fe]</sub> = 0.92; F<sub>pCO2</sub> = 15.56, p<sub>pCO2</sub><0.001; F<sub>[Fe],pCO2</sub> = 5.85, p<sub>[Fe],pCO2</sub> = 0.023).</p>", "links"=>[], "tags"=>["phytoplankton"], "article_id"=>858221, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.g003", "stats"=>{"downloads"=>0, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Net_primary_production_of_final_phytoplankton_communities_/858221", "title"=>"Net primary production of final phytoplankton communities.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289923"], "description"=>"<p>Fe uptake capacities [pmol Fe (µmol POC)<sup>−1</sup> h<sup>−1</sup>] of Fe-enriched (solid bars) and -depleted (open bars) final phytoplankton communities (n = 3; mean ±1 s.d.) estimated from 24 h incubation with 1 nM <sup>55</sup>Fe as a function of pCO<sub>2</sub> [μatm]. Statistical analysis (2-way ANOVA) revealed significant differences between Fe-treatments (F = 62.217, p = <0.001) but not between CO<sub>2</sub>-treatments (F = 1.205, p = 0.349).</p>", "links"=>[], "tags"=>["uptake", "capacities", "phytoplankton"], "article_id"=>858220, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.g002", "stats"=>{"downloads"=>0, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Iron_uptake_capacities_of_final_phytoplankton_communities_/858220", "title"=>"Iron uptake capacities of final phytoplankton communities.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289928"], "description"=>"<p>Species composition of the initial community (n = 1) and at the end of the experiment (% of total cell count; n = 3; average ±1s.d.).</p>", "links"=>[], "tags"=>[], "article_id"=>858225, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.t003", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Microscopic_cell_counts_/858225", "title"=>"Microscopic cell counts.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289927"], "description"=>"<p>Parameters of the seawater carbonate chemistry were sampled at the beginning (<i>n</i> = 1) and the end of the experiment (<i>n</i> = 3; mean ±1 s.d.). Total dissolved Fe measurements in abiotic control treatments after 0.2 µm filtration as measured by voltammetry (<i>n</i> = 2; mean ± 1 s.d.). The decreased dissolved Fe concentration in the +Fe treatment can be attributed to precipitation/absorption of colloidal iron. pCO<sub>2</sub> was calculated from TA and pH<sub>total</sub> at 3°C and a salinity of 34 using CO<sub>2</sub>SYS <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079890#pone.0079890-Pierrot1\" target=\"_blank\">[27]</a>, using average final nutrient concentrations of 1 and 60 µmol kg<sup>−1</sup> for phosphate and silicate, respectively.</p>", "links"=>[], "tags"=>[], "article_id"=>858224, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.t001", "stats"=>{"downloads"=>0, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Seawater_chemistry_/858224", "title"=>"Seawater chemistry.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289926"], "description"=>"<p>A, Fe-enriched 190 μatm (39±5% <i>Pseudo-nitzschia</i>, 43±4% <i>Fragilariopsis</i>); B, Fe-enriched 390 μatm (40±9% <i>Pseudo-nitzschia</i>, 42±12% <i>Fragilariopsis</i>); C, Fe-enriched 800 μatm (72±5% <i>Fragilariopsis</i>); D, Fe-depleted 190 μatm (55±16% <i>Pseudo-nitzschia</i>, 26±20% <i>Synedropsis</i>); E, Fe-depleted 390 μatm (51±15% <i>Pseudo-nitzschia</i>, 29±16% <i>Synedropsis</i>); F, Fe-depleted 800 μatm (78±2% <i>Synedropsis</i>).</p>", "links"=>[], "tags"=>["microscopy", "pictures"], "article_id"=>858222, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.g004", "stats"=>{"downloads"=>0, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Representative_microscopy_pictures_of_species_composition_of_the_final_communities_/858222", "title"=>"Representative microscopy pictures of species composition of the final communities.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289922"], "description"=>"<p>Experimental conditions over the course of the experiment. A: Development of pH<sub>total</sub> (n = 3; mean ±1 s.d.) in Fe-enriched (solid circles, 190 μatm CO<sub>2</sub>; solid squares, 390 μatm CO<sub>2</sub>; solid triangles, 800 μatm CO<sub>2</sub>) and Fe-depleted treatments (open circles, 190 μatm CO<sub>2</sub>; open squares, 390 μatm CO<sub>2</sub>; open triangles, 800 μatm CO<sub>2</sub>). B: Development of dark-adapted F<sub>v</sub>/F<sub>m</sub> (n = 3; mean ±1 s.d.) in Fe-enriched (solid squares) and Fe-depleted treatments (open squares).</p>", "links"=>[], "tags"=>[], "article_id"=>858219, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.g001", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_pH_and_F_v_F_m_over_the_course_of_the_experiment_/858219", "title"=>"pH and F<sub>v</sub>/F<sub>m</sub> over the course of the experiment.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-20 03:29:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/1289929"], "description"=>"<p>Final Chl a∶ POC ratios (µg∶µg) and photophysiological parameters (apparent maximum quantum yield of PSII F<sub>v</sub>/F<sub>m</sub>, proportion of non-photochemical quenching, NPQ, functional absorption cross section of PSII (σ<sub>PSII</sub> [Å<sup>2</sup> quanta<sup>−1</sup>]), and relative electron transport rates from PSII, rETR) of the final communities grown under different CO<sub>2</sub> and Fe levels (n = 3; mean ±1 s.d.). Fe-depleted (−Fe) and Fe-enriched (+Fe) conditions were achieved by the addition of 10 nmol kg<sup>−1</sup> DFB and 1 nmol kg<sup>−1</sup> FeCl<sub>3</sub>, respectively. Bold <i>p</i> values indicate statistically significant differences between treatments (p<0.05; 2-way ANOVA).</p>", "links"=>[], "tags"=>["differences"], "article_id"=>858226, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Clara J. M. Hoppe", "Christel S. Hassler", "Christopher D. Payne", "Philippe D. Tortell", "Björn Rost", "Scarlett Trimborn"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079890.t002", "stats"=>{"downloads"=>2, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Physiological_differences_between_treatments_/858226", "title"=>"Physiological differences between treatments.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-11-20 03:29:18"}

PMC Usage Stats | Further Information

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  • {"unique-ip"=>"5", "full-text"=>"4", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"3"}
  • {"unique-ip"=>"3", "full-text"=>"1", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"4"}
  • {"unique-ip"=>"13", "full-text"=>"11", "pdf"=>"3", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"5"}
  • {"unique-ip"=>"9", "full-text"=>"7", "pdf"=>"5", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"8"}
  • {"unique-ip"=>"4", "full-text"=>"3", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"9"}

Relative Metric

{"start_date"=>"2013-01-01T00:00:00Z", "end_date"=>"2013-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Earth sciences/Hydrology", "average_usage"=>[253, 387, 495, 587, 670, 757, 847, 930, 1011, 1082, 1167, 1237, 1309]}, {"subject_area"=>"/Earth sciences/Marine and aquatic sciences", "average_usage"=>[299, 492, 619, 718, 826, 932, 1037, 1143, 1246, 1333, 1414, 1517, 1575]}, {"subject_area"=>"/Ecology and environmental sciences", "average_usage"=>[284, 475, 603, 722, 826, 928, 1026, 1129, 1225, 1310, 1390, 1468, 1549]}, {"subject_area"=>"/Ecology and environmental sciences/Ecology", "average_usage"=>[298, 487, 610, 722, 827, 929, 1029, 1125, 1217, 1306, 1388, 1464, 1535]}, {"subject_area"=>"/Physical sciences", "average_usage"=>[254, 431, 547, 651, 748, 842, 932, 1017, 1098, 1178, 1259, 1336, 1404]}, {"subject_area"=>"/Physical sciences/Chemistry", "average_usage"=>[247, 429, 544, 647, 747, 842, 929, 1012, 1099, 1179, 1263, 1339, 1409]}]}
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