Diet Reconstruction and Resource Partitioning of a Caribbean Marine Mesopredator Using Stable Isotope Bayesian Modelling
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{"title"=>"Diet reconstruction and resource partitioning of a Caribbean marine mesopredator using stable isotope Bayesian modelling", "type"=>"journal", "authors"=>[{"first_name"=>"Alexander", "last_name"=>"Tilley", "scopus_author_id"=>"55513192400"}, {"first_name"=>"Juliana", "last_name"=>"López-Angarita", "scopus_author_id"=>"50262538100"}, {"first_name"=>"John R.", "last_name"=>"Turner", "scopus_author_id"=>"56909237500"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-84893356078", "pui"=>"372245029", "pmid"=>"24236144", "issn"=>"19326203", "isbn"=>"1932-6203", "doi"=>"10.1371/journal.pone.0079560", "sgr"=>"84893356078"}, "id"=>"cd6a28e2-da83-38c6-9bd4-29a322d58e58", "abstract"=>"The trophic ecology of epibenthic mesopredators is not well understood in terms of prey partitioning with sympatric elasmobranchs or their effects on prey communities, yet the importance of omnivores in community trophic dynamics is being increasingly realised. This study used stable isotope analysis of (15)N and (13)C to model diet composition of wild southern stingrays Dasyatis americana and compare trophic niche space to nurse sharks Ginglymostoma cirratum and Caribbean reef sharks Carcharhinus perezi on Glovers Reef Atoll, Belize. Bayesian stable isotope mixing models were used to investigate prey choice as well as viable Diet-Tissue Discrimination Factors for use with stingrays. Stingray δ(15)N values showed the greatest variation and a positive relationship with size, with an isotopic niche width approximately twice that of sympatric species. Shark species exhibited comparatively restricted δ(15)N values and greater δ(13)C variation, with very little overlap of stingray niche space. Mixing models suggest bivalves and annelids are proportionally more important prey in the stingray diet than crustaceans and teleosts at Glovers Reef, in contrast to all but one published diet study using stomach contents from other locations. Incorporating gut contents information from the literature, we suggest diet-tissue discrimination factors values of Δ(15)N ≈ 2.7‰ and Δ(13)C ≈ 0.9‰ for stingrays in the absence of validation experiments. The wide trophic niche and lower trophic level exhibited by stingrays compared to sympatric sharks supports their putative role as important base stabilisers in benthic systems, with the potential to absorb trophic perturbations through numerous opportunistic prey interactions.", "link"=>"http://www.mendeley.com/research/diet-reconstruction-resource-partitioning-caribbean-marine-mesopredator-using-stable-isotope-bayesia-1", "reader_count"=>96, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>1, "Researcher"=>16, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>28, "Student > Postgraduate"=>6, "Student > Master"=>23, "Other"=>4, "Student > Bachelor"=>9, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>1, "Researcher"=>16, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>28, "Student > Postgraduate"=>6, "Student > Master"=>23, "Other"=>4, "Student > Bachelor"=>9, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Engineering"=>1, "Unspecified"=>6, "Environmental Science"=>16, "Biochemistry, Genetics and Molecular Biology"=>2, "Agricultural and Biological Sciences"=>65, "Medicine and Dentistry"=>2, "Earth and Planetary Sciences"=>4}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>4}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>65}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Unspecified"=>{"Unspecified"=>6}, "Environmental Science"=>{"Environmental Science"=>16}}, "reader_count_by_country"=>{"Republic of Singapore"=>1, "Canada"=>1, "United States"=>2, "Brazil"=>2, "South Africa"=>2, "Mexico"=>1, "France"=>1}, "group_count"=>3}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1279236"], "description"=>"<p>This DTDF were used to adjust prey species values of δ<sup>13</sup>C and δ<sup>15</sup>N in δ<sup>15</sup>N vs. δ<sup>13</sup>C plots, and in stable isotope mixing models of stingray diet composition. SD = Standard Deviation.</p>*<p>A Δ<sup>13</sup>C value (or SD values) was not published in Robbins et al. <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079560#pone.0079560-Robbins1\" target=\"_blank\">[41]</a>, so the median value from all studies (0.39) was used in these plots.</p>", "links"=>[], "tags"=>[], "article_id"=>849470, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.t001", "stats"=>{"downloads"=>2, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Diet_Tissue_Discrimination_Factors_from_the_literature_/849470", "title"=>"Diet-Tissue Discrimination Factors from the literature.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279233"], "description"=>"<p>Values for <i>D. americana, G. cirratum</i> and <i>C. perezi</i> are displayed as combined mean (± SD) skin and muscle tissues (δ<sup>13</sup>C −8.09±1.7, δ<sup>15</sup>N 7.36±1.5; δ<sup>13</sup>C −8.32±2.62, δ<sup>15</sup>N 9.03±0.46; δ<sup>13</sup>C −9.37±0.98, δ<sup>15</sup>N 8.7±0.32 respectively).</p>", "links"=>[], "tags"=>["samples", "prey", "sympatric", "glovers", "reef"], "article_id"=>849467, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.g003", "stats"=>{"downloads"=>0, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Bivariate_plot_of_13_C_vs_948_15_N_values_from_tissue_samples_collected_from_D_americana_potential_prey_species_and_sympatric_shark_species_at_Glovers_Reef_between_2008_2010_/849467", "title"=>"Bivariate plot of δ<sup>13</sup>C vs. δ<sup>15</sup>N values from tissue samples collected from <i>D. americana</i>, potential prey species, and sympatric shark species at Glovers Reef between 2008–2010.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279232"], "description"=>"<p>Different colour tones represent quartile volume contours constructed using kernel density estimation.</p>", "links"=>[], "tags"=>["contour", "perezi", "fin", "sampled", "populations", "glovers", "reef"], "article_id"=>849466, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.g002", "stats"=>{"downloads"=>1, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Density_contour_plot_of_13_C_vs_948_15_N_values_for_C_perezi_fin_blue_and_muscle_tissues_red_G_cirratum_fin_brown_and_muscle_grey_and_D_americana_skin_purple_and_muscle_green_sampled_from_wild_populations_at_Glovers_Reef_Atoll_Belize_/849466", "title"=>"Density contour plot of δ<sup>13</sup>C vs. δ<sup>15</sup>N values for <i>C. perezi fin (blue) and muscle tissues</i> (red), <i>G. cirratum</i> fin (brown) and muscle (grey) and <i>D. americana</i> skin (purple) and muscle (green) sampled from wild populations at Glovers Reef Atoll, Belize.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279235"], "description"=>"<p>Bivariate plots of isotopic space depicting niche areas for muscle tissue of <i>Dasyatis americana</i> (red), <i>Ginglymostoma cirratum</i> (blue) and <i>Carcharhinus perezi</i> (green), using (A) convex hull areas <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079560#pone.0079560-Layman1\" target=\"_blank\">[40]</a>, and (B) Bayesian ellipses <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079560#pone.0079560-Jackson1\" target=\"_blank\">[17]</a>.</p>", "links"=>[], "tags"=>["isotopic", "depicting", "niche", "areas", "convex", "hull", "bayesian", "ellipses"], "article_id"=>849469, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.g005", "stats"=>{"downloads"=>0, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Bivariate_plots_of_isotopic_space_depicting_niche_areas_for_muscle_tissue_of_Dasyatis_americana_red_Ginglymostoma_cirratum_blue_and_Carcharhinus_perezi_green_using_A_convex_hull_areas_40_and_B_Bayesian_ellipses_17_/849469", "title"=>"Bivariate plots of isotopic space depicting niche areas for muscle tissue of <i>Dasyatis americana</i> (red), <i>Ginglymostoma cirratum</i> (blue) and <i>Carcharhinus perezi</i> (green), using (A) convex hull areas [40], and (B) Bayesian ellipses [17].", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279234"], "description"=>"<p>Red shaded areas represent 95% bivariate normal confidence ellipses for correlative relationships (A) Spearman's r(8) = 0.75 P<0.034 (B) Spearman's r(11) = 0.47, P = 0.15.</p>", "links"=>[], "tags"=>[], "article_id"=>849468, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.g004", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationship_between_15_N_values_and_individual_size_disk_width_for_D_americana_skin_A_and_muscle_B_/849468", "title"=>"Relationship between δ<sup>15</sup>N values and individual size (disk width) for <i>D. americana</i> skin (A) and muscle (B).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279230"], "description"=>"<p>(A) Glovers Reef Atoll within Belize, (B) Map of Glovers Reef Atoll, (C) Enlarged satellite image of the main sampling area on Glovers Reef Atoll.</p>", "links"=>[], "tags"=>[], "article_id"=>849464, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.g001", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Study_site_location_/849464", "title"=>"Study site location.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-11-13 03:44:39"}
  • {"files"=>["https://ndownloader.figshare.com/files/1279237"], "description"=>"<p>Prey groups are listed in order of decreasing proportional volume where data available. Unnumbered prey indicates prey proportions were not ranked. Column N represents the number of rays sampled in each study.</p>", "links"=>[], "tags"=>["prey", "studies", "lowest", "taxonomic", "stated"], "article_id"=>849471, "categories"=>["Biological Sciences", "Ecology", "Earth and Environmental Sciences"], "users"=>["Alexander Tilley", "Juliana López-Angarita", "John R. Turner"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0079560.t002", "stats"=>{"downloads"=>3, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Major_prey_identified_from_stomach_analysis_studies_of_D_americana_according_to_lowest_taxonomic_group_as_stated_in_source_/849471", "title"=>"Major prey identified from stomach analysis studies of <i>D. americana</i>, according to lowest taxonomic group (as stated in source).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-11-13 03:44:39"}

PMC Usage Stats | Further Information

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  • {"unique-ip"=>"5", "full-text"=>"16", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"6"}
  • {"unique-ip"=>"4", "full-text"=>"3", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"4"}
  • {"unique-ip"=>"5", "full-text"=>"7", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"6", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2015", "month"=>"4"}
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  • {"unique-ip"=>"9", "full-text"=>"6", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"7"}
  • {"unique-ip"=>"7", "full-text"=>"4", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"8"}
  • {"unique-ip"=>"5", "full-text"=>"4", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"9"}
  • {"unique-ip"=>"9", "full-text"=>"10", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"10"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"2"}
  • {"unique-ip"=>"12", "full-text"=>"10", "pdf"=>"3", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2014", "month"=>"11"}
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  • {"unique-ip"=>"13", "full-text"=>"7", "pdf"=>"7", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"1", "year"=>"2015", "month"=>"11"}
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  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"1"}
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  • {"unique-ip"=>"4", "full-text"=>"3", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"4"}
  • {"unique-ip"=>"7", "full-text"=>"6", "pdf"=>"4", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"5"}
  • {"unique-ip"=>"4", "full-text"=>"3", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"6"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"7"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"8"}
  • {"unique-ip"=>"5", "full-text"=>"5", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"9"}
  • {"unique-ip"=>"2", "full-text"=>"1", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"10"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"11"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2016", "month"=>"12"}
  • {"unique-ip"=>"8", "full-text"=>"6", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"1"}
  • {"unique-ip"=>"3", "full-text"=>"2", "pdf"=>"2", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"2"}
  • {"unique-ip"=>"6", "full-text"=>"5", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"3"}
  • {"unique-ip"=>"1", "full-text"=>"1", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"4"}
  • {"unique-ip"=>"2", "full-text"=>"3", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"5"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"4", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"6"}
  • {"unique-ip"=>"5", "full-text"=>"5", "pdf"=>"4", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"7"}
  • {"unique-ip"=>"2", "full-text"=>"2", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"8"}
  • {"unique-ip"=>"4", "full-text"=>"4", "pdf"=>"1", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"9"}
  • {"unique-ip"=>"3", "full-text"=>"3", "pdf"=>"0", "abstract"=>"0", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2017", "month"=>"10"}
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  • {"unique-ip"=>"4", "full-text"=>"5", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"1", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"6"}
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Relative Metric

{"start_date"=>"2013-01-01T00:00:00Z", "end_date"=>"2013-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences", "average_usage"=>[269, 466, 588, 697, 800, 896, 988, 1076, 1165, 1254, 1340, 1417]}, {"subject_area"=>"/Biology and life sciences/Anatomy", "average_usage"=>[248, 440, 562, 666, 765, 856, 944, 1028, 1112, 1198, 1282, 1362, 1430]}, {"subject_area"=>"/Biology and life sciences/Marine biology", "average_usage"=>[379, 624, 751, 898, 1019, 1162, 1280, 1377, 1482, 1611, 1750, 1853, 1936, 1987]}, {"subject_area"=>"/Biology and life sciences/Organisms", "average_usage"=>[281, 484, 611, 728, 835, 934, 1030, 1123, 1214, 1299, 1383, 1464]}, {"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"=>"/Ecology and environmental sciences/Marine ecology", "average_usage"=>[322, 480]}, {"subject_area"=>"/Medicine and health sciences/Anatomy and physiology", "average_usage"=>[253, 430]}, {"subject_area"=>"/Physical sciences", "average_usage"=>[254, 431, 547, 651, 748, 842, 932, 1017, 1098, 1178, 1259, 1336, 1404]}, {"subject_area"=>"/Physical sciences/Physics", "average_usage"=>[254, 421, 527, 626, 720, 813, 900, 983, 1063, 1136, 1210, 1283, 1342]}]}
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