Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal
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{"title"=>"Relative changes in krill abundance inferred from antarctic fur seal", "type"=>"journal", "authors"=>[{"first_name"=>"Tao", "last_name"=>"Huang", "scopus_author_id"=>"57087624700"}, {"first_name"=>"Liguang", "last_name"=>"Sun", "scopus_author_id"=>"7403957370"}, {"first_name"=>"John", "last_name"=>"Stark", "scopus_author_id"=>"7403024757"}, {"first_name"=>"Yuhong", "last_name"=>"Wang", "scopus_author_id"=>"15049955800"}, {"first_name"=>"Zhongqi", "last_name"=>"Cheng", "scopus_author_id"=>"7401815155"}, {"first_name"=>"Qichao", "last_name"=>"Yang", "scopus_author_id"=>"36088360600"}, {"first_name"=>"Song", "last_name"=>"Sun", "scopus_author_id"=>"55674953600"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"362874707", "sgr"=>"80455158338", "issn"=>"19326203", "pmid"=>"22087294", "scopus"=>"2-s2.0-80455158338", "doi"=>"10.1371/journal.pone.0027331", "isbn"=>"1932-6203"}, "id"=>"b1fadcdc-b17b-30f5-b10d-18daad995f7f", "abstract"=>"Antarctic krill Euphausia superba is a predominant species in the Southern Ocean, it is very sensitive to climate change, and it supports large stocks of fishes, seabirds, seals and whales in Antarctic marine ecosystems. Modern krill stocks have been estimated directly by net hauls and acoustic surveys; the historical krill density especially the long-term one in the Southern Ocean, however, is unknown. Here we inferred the relative krill population changes along the West Antarctic Peninsula (WAP) over the 20th century from the trophic level change of Antarctic fur seal Arctocephalus gazella using stable carbon (δ(13)C) and nitrogen (δ(15)N) isotopes of archival seal hairs. Since Antarctic fur seals feed preferentially on krill, the variation of δ(15)N in seal hair indicates a change in the proportion of krill in the seal's diets and thus the krill availability in local seawater. For the past century, enriching fur seal δ(15)N values indicated decreasing krill availability. This is agreement with direct observation for the past ∼30 years and suggests that the recently documented decline in krill populations began in the early parts of the 20th century. This novel method makes it possible to infer past krill population changes from ancient tissues of krill predators.", "link"=>"http://www.mendeley.com/research/relative-changes-krill-abundance-inferred-antarctic-fur-seal", "reader_count"=>32, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Researcher"=>9, "Student > Ph. D. Student"=>5, "Student > Postgraduate"=>4, "Other"=>3, "Student > Master"=>4, "Student > Bachelor"=>5}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Researcher"=>9, "Student > Ph. D. Student"=>5, "Student > Postgraduate"=>4, "Other"=>3, "Student > Master"=>4, "Student > Bachelor"=>5}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Environmental Science"=>4, "Agricultural and Biological Sciences"=>24, "Earth and Planetary Sciences"=>1}, "reader_count_by_subdiscipline"=>{"Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>24}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>4}}, "reader_count_by_country"=>{"Colombia"=>1, "Argentina"=>1, "United States"=>1, "Australia"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/715491"], "description"=>"<p>Note: The δ<sup>15</sup>N of hairs are added 3.0‰ for fractionation effect according to Hobson et al. <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Hobson2\" target=\"_blank\">[28]</a>. Prey δ<sup>15</sup>N values are compiled from Emslie & Patterson <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Emslie1\" target=\"_blank\">[22]</a> for krill and Cherel et al. <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Cherel2\" target=\"_blank\">[29]</a> for <i>Electrona antarctica</i> and <i>Gymnoscopelus nicholsi</i>.</p>", "links"=>[], "tags"=>["percentages", "prey", "items"], "article_id"=>385853, "categories"=>["Inorganic Chemistry", "Chemistry", "Ecology", "Evolutionary Biology"], "users"=>["Tao Huang", "Liguang Sun", "John Stark", "Yuhong Wang", "Zhongqi Cheng", "Qichao Yang", "Song Sun"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0027331.t001", "stats"=>{"downloads"=>7, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Estimated_15_N_values_in_seal_hair_with_various_percentages_of_prey_items_in_seal_diets_/385853", "title"=>"Estimated δ<sup>15</sup>N values in seal hair with various percentages of prey items in seal diets.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 11:56:48"}
  • {"files"=>["https://ndownloader.figshare.com/files/715329"], "description"=>"<p>(a), δ<sup>13</sup>C values of seal hair. (b), δ<sup>15</sup>N values of seal excrement sediment. (c), δ<sup>15</sup>N values of seal hair. (d), Sea ice cover along the WAP <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Ducklow1\" target=\"_blank\">[2]</a>. (e), Krill populations change along the WAP <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Atkinson1\" target=\"_blank\">[3]</a>. (f), Southern Ocean SST anomalies <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0027331#pone.0027331-Rayner1\" target=\"_blank\">[25]</a>.</p>", "links"=>[], "tags"=>["isotope", "hn1"], "article_id"=>385686, "categories"=>["Inorganic Chemistry", "Chemistry", "Ecology", "Evolutionary Biology"], "users"=>["Tao Huang", "Liguang Sun", "John Stark", "Yuhong Wang", "Zhongqi Cheng", "Qichao Yang", "Song Sun"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0027331.g002", "stats"=>{"downloads"=>3, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Changes_in_stable_isotope_values_of_seal_hair_in_HN1_and_regional_biological_and_physical_conditions_/385686", "title"=>"Changes in stable isotope values of seal hair in HN1 and regional biological and physical conditions.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 11:55:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/715211"], "description"=>"<p>(a), <sup>137</sup>Cs signal in the sediments of HN1. (b), <sup>137</sup>Cs determined age versus depths in HN1.</p>", "links"=>[], "tags"=>["hn1"], "article_id"=>385567, "categories"=>["Inorganic Chemistry", "Chemistry", "Ecology", "Evolutionary Biology"], "users"=>["Tao Huang", "Liguang Sun", "John Stark", "Yuhong Wang", "Zhongqi Cheng", "Qichao Yang", "Song Sun"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0027331.g001", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Chronology_of_HN1_by_137_Cs_dating_/385567", "title"=>"Chronology of HN1 by <sup>137</sup>Cs dating.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 11:55:16"}

PMC Usage Stats | Further Information

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Relative Metric

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