Egg Production in a Coastal Seabird, the Glaucous-Winged Gull (Larus glaucescens), Declines during the Last Century
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{"title"=>"Egg production in a coastal seabird, the glaucous-winged gull (larus glaucescens), declines during the last century", "type"=>"journal", "authors"=>[{"first_name"=>"Louise K.", "last_name"=>"Blight", "scopus_author_id"=>"6602094315"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"362183685", "issn"=>"19326203", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "doi"=>"10.1371/journal.pone.0022027", "scopus"=>"2-s2.0-79960587075", "pmid"=>"21789207", "sgr"=>"79960587075"}, "id"=>"ea2e1255-178a-380e-8616-138dba7642a1", "abstract"=>"Seabirds integrate information about oceanic ecosystems across time and space, and are considered sensitive indicators of marine conditions. To assess whether hypothesized long-term foodweb changes such as forage fish declines may be reflected in a consumer's life history traits over time, I used meta-regression to evaluate multi-decadal changes in aspects of egg production in the glaucous-winged gull (Larus glaucescens), a common coastal bird. Study data were derived from literature searches of published papers and unpublished historical accounts, museum egg collections, and modern field studies, with inclusion criteria based on data quality and geographic area of the original study. Combined historical and modern data showed that gull egg size declined at an average of 0.04 cc y(-1) from 1902 (108 y), equivalent to a decline of 5% of mean egg volume, while clutch size decreased over 48 y from a mean of 2.82 eggs per clutch in 1962 to 2.25 in 2009. There was a negative relationship between lay date and mean clutch size in a given year, with smaller clutches occurring in years where egg laying commenced later. Lay date itself advanced over time, with commencement of laying presently (2008-2010) 7 d later than in previous studies (1959-1986). This study demonstrates that glaucous-winged gull investment in egg production has declined significantly over the past ∼50-100 y, with such changes potentially contributing to recent population declines. Though gulls are generalist feeders that should readily be able to buffer themselves against food web changes, they are likely nutritionally constrained during the early breeding period, when egg production requirements are ideally met by consumption of high-quality prey such as forage fish. This study's results suggest a possible decline in the availability of such prey, and the incremental long-term impoverishment of a coastal marine ecosystem bordering one of North America's rapidly growing urban areas.", "link"=>"http://www.mendeley.com/research/egg-production-coastal-seabird-glaucouswinged-gull-larus-glaucescens-declines-during-last-century", "reader_count"=>42, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>1, "Researcher"=>6, "Student > Ph. D. Student"=>17, "Student > Master"=>5, "Other"=>2, "Student > Bachelor"=>6, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>1, "Researcher"=>6, "Student > Ph. D. Student"=>17, "Student > Master"=>5, "Other"=>2, "Student > Bachelor"=>6, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Environmental Science"=>8, "Agricultural and Biological Sciences"=>25, "Medicine and Dentistry"=>3, "Computer Science"=>1, "Immunology and Microbiology"=>1, "Earth and Planetary Sciences"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>3}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>25}, "Computer Science"=>{"Computer Science"=>1}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>8}}, "reader_count_by_country"=>{"Romania"=>1, "United States"=>1, "United Kingdom"=>2, "Australia"=>1, "Portugal"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/380088"], "description"=>"<div><p>Seabirds integrate information about oceanic ecosystems across time and space, and are considered sensitive indicators of marine conditions. To assess whether hypothesized long-term foodweb changes such as forage fish declines may be reflected in a consumer's life history traits over time, I used meta-regression to evaluate multi-decadal changes in aspects of egg production in the glaucous-winged gull (<em>Larus glaucescens</em>), a common coastal bird. Study data were derived from literature searches of published papers and unpublished historical accounts, museum egg collections, and modern field studies, with inclusion criteria based on data quality and geographic area of the original study. Combined historical and modern data showed that gull egg size declined at an average of 0.04 cc y<sup>−1</sup> from 1902 (108 y), equivalent to a decline of 5% of mean egg volume, while clutch size decreased over 48 y from a mean of 2.82 eggs per clutch in 1962 to 2.25 in 2009. There was a negative relationship between lay date and mean clutch size in a given year, with smaller clutches occurring in years where egg laying commenced later. Lay date itself advanced over time, with commencement of laying presently (2008–2010) 7 d later than in previous studies (1959–1986). This study demonstrates that glaucous-winged gull investment in egg production has declined significantly over the past ∼50–100 y, with such changes potentially contributing to recent population declines. Though gulls are generalist feeders that should readily be able to buffer themselves against food web changes, they are likely nutritionally constrained during the early breeding period, when egg production requirements are ideally met by consumption of high-quality prey such as forage fish. This study's results suggest a possible decline in the availability of such prey, and the incremental long-term impoverishment of a coastal marine ecosystem bordering one of North America's rapidly growing urban areas.</p> </div>", "links"=>[], "tags"=>["glaucous-winged", "gull", "declines"], "article_id"=>135104, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology", "Science Policy", "Evolutionary Biology"], "users"=>["Louise K. Blight", "L K Blight"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022027", "stats"=>{"downloads"=>7, "page_views"=>29, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Egg_Production_in_a_Coastal_Seabird_the_Glaucous_Winged_Gull_Larus_glaucescens_Declines_during_the_Last_Century/135104", "title"=>"Egg Production in a Coastal Seabird, the Glaucous-Winged Gull (<em>Larus glaucescens</em>), Declines during the Last Century", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2011-07-18 01:25:04"}
  • {"files"=>["https://ndownloader.figshare.com/files/755672"], "description"=>"<p>Meta-regression of glaucous-winged gull clutch size vs. year. Clutch size decreased with delayed onset of breeding (first egg date; <i>Q</i> = 12.91, <i>p</i><0.001; 1962–2009 data). Symbol size represents meta-analytical weightings for each data point.</p>", "links"=>[], "tags"=>["glaucous-winged", "gull", "clutch"], "article_id"=>426050, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology", "Science Policy", "Evolutionary Biology"], "users"=>["Louise K. Blight", "L K Blight"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022027.g002", "stats"=>{"downloads"=>1, "page_views"=>22, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Meta_regression_of_glaucous_winged_gull_clutch_size_vs_year_/426050", "title"=>"Meta-regression of glaucous-winged gull clutch size vs. year.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-07-18 01:40:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/755585"], "description"=>"<p>Meta-regression of glaucous-winged gull egg and clutch size vs. year, Salish Sea (SW Canada & NW USA). Symbol size represents meta-analytical weightings for each data point. Note different temporal scales on x-axes. (A) Egg volume decreased over the study period (1902–2009; <i>Q</i> = 7.211, <i>p</i><0.01), with eggs now 5% smaller on average than at the turn of the 20<sup>th</sup> century. (B) Clutch size decreased between 1962 and 2009 (<i>Q</i> = 27.30, <i>p</i><0.001). Two data points from the 1940s–50s (represented by ×) are not included in the meta-analysis due to inadequate reporting criteria (see text), but are plotted here to further illustrate robustness of trend.</p>", "links"=>[], "tags"=>["glaucous-winged", "gull", "clutch", "salish", "canada", "nw"], "article_id"=>425955, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology", "Science Policy", "Evolutionary Biology"], "users"=>["Louise K. Blight", "L K Blight"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022027.g001", "stats"=>{"downloads"=>1, "page_views"=>30, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Meta_regression_of_glaucous_winged_gull_egg_and_clutch_size_vs_year_Salish_Sea_SW_Canada_amp_NW_USA_/425955", "title"=>"Meta-regression of glaucous-winged gull egg and clutch size vs. year, Salish Sea (SW Canada & NW USA).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-07-18 01:39:15"}
  • {"files"=>["https://ndownloader.figshare.com/files/755810"], "description"=>"1<p>See Acknowledgements for list of contributing museums.</p>2<p>See <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022027#pone.0022027.s001\" target=\"_blank\">Table S1</a> for colony details.</p>3<p>See text.</p>4<p>WA – Washington, USA.</p>5<p>BC – British Columbia, Canada.</p>", "links"=>[], "tags"=>["studies"], "article_id"=>426189, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology", "Science Policy", "Evolutionary Biology"], "users"=>["Louise K. Blight", "L K Blight"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022027.t001", "stats"=>{"downloads"=>14, "page_views"=>36, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Summary_of_studies_used_in_standard_and_meta_analyses_/426189", "title"=>"Summary of studies used in standard and meta-analyses.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2011-07-18 01:43:09"}
  • {"files"=>["https://ndownloader.figshare.com/files/755714"], "description"=>"<p>First egg date retreated significantly from 1959–2010 (<i>p</i> = 0.03, ▴: <i>n</i> = 2 observations), with mean commencement date 7 d later in 2008–2010 than in earlier decades (<i>F</i> = 20.12, <i>p</i><0.001).</p>", "links"=>[], "tags"=>["retreated"], "article_id"=>426094, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology", "Science Policy", "Evolutionary Biology"], "users"=>["Louise K. Blight", "L K Blight"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022027.g003", "stats"=>{"downloads"=>1, "page_views"=>30, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_First_egg_date_retreated_significantly_from_1959_8211_2010_/426094", "title"=>"First egg date retreated significantly from 1959–2010.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-07-18 01:41:34"}

PMC Usage Stats | Further Information

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Relative Metric

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