Mercury Reduces Avian Reproductive Success and Imposes Selection: An Experimental Study with Adult- or Lifetime-Exposure in Zebra Finch
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{"title"=>"Mercury reduces avian reproductive success and imposes selection: An experimental study with adult- or lifetime-exposure in zebra finch", "type"=>"journal", "authors"=>[{"first_name"=>"Claire W.", "last_name"=>"Varian-Ramos", "scopus_author_id"=>"35070564200"}, {"first_name"=>"John P.", "last_name"=>"Swaddle", "scopus_author_id"=>"7004209946"}, {"first_name"=>"Daniel A.", "last_name"=>"Cristol", "scopus_author_id"=>"6603943741"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"373007633", "sgr"=>"84899729312", "pmid"=>"24759822", "scopus"=>"2-s2.0-84899729312", "doi"=>"10.1371/journal.pone.0095674", "issn"=>"19326203"}, "id"=>"5a2cab14-91f0-3a39-a56b-fc909ead664f", "abstract"=>"Mercury is a global pollutant that biomagnifies in food webs, placing wildlife at risk of reduced reproductive fitness and survival. Songbirds are the most diverse branch of the avian evolutionary tree; many are suffering persistent and serious population declines and we know that songbirds are frequently exposed to mercury pollution. Our objective was to determine the effects of environmentally relevant doses of mercury on reproductive success of songbirds exposed throughout their lives or only as adults. The two modes of exposure simulated philopatric species versus dispersive species, and are particularly relevant because of the heightened mercury-sensitivity of developing nervous systems. We performed a dosing study with dietary methylmercury in a model songbird species, the zebra finch (Taeniopygia guttata), at doses from 0.3 - 2.4 parts per million. Birds were exposed to mercury either as adults only or throughout their lives. All doses of mercury reduced reproductive success, with the lowest dose reducing the number of independent offspring produced in one year by 16% and the highest dose, representing approximately half the lethal dose for this species, causing a 50% reduction. While mercury did not affect clutch size or survivorship, it had the most consistent effect on the proportion of chicks that fledged from the nest, regardless of mode of exposure. Among birds exposed as adults, mercury caused a steep increase in the latency to re-nest after loss of a clutch. Birds exposed for their entire lifetimes, which were necessarily the offspring of dosed parents, had up to 50% lower reproductive success than adult-exposed birds at low doses of methylmercury, but increased reproductive success at high doses, suggesting selection for mercury tolerance at the highest level of exposure. Our results indicate that mercury levels in prey items at contaminated sites pose a significant threat to populations of songbirds through reduced reproductive success.", "link"=>"http://www.mendeley.com/research/mercury-reduces-avian-reproductive-success-imposes-selection-experimental-study-adult-lifetimeexposu", "reader_count"=>58, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>6, "Student > Doctoral Student"=>6, "Researcher"=>7, "Student > Ph. D. Student"=>7, "Student > Postgraduate"=>1, "Other"=>6, "Student > Master"=>13, "Student > Bachelor"=>6, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>6, "Student > Doctoral Student"=>6, "Researcher"=>7, "Student > Ph. D. Student"=>7, "Student > Postgraduate"=>1, "Other"=>6, "Student > Master"=>13, "Student > Bachelor"=>6, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_subject_area"=>{"Unspecified"=>6, "Environmental Science"=>9, "Biochemistry, Genetics and Molecular Biology"=>2, "Agricultural and Biological Sciences"=>37, "Medicine and Dentistry"=>2, "Neuroscience"=>1, "Chemistry"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Neuroscience"=>{"Neuroscience"=>1}, "Chemistry"=>{"Chemistry"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>37}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Unspecified"=>{"Unspecified"=>6}, "Environmental Science"=>{"Environmental Science"=>9}}, "reader_count_by_country"=>{"Romania"=>1, "United States"=>2, "Australia"=>2, "Spain"=>2}, "group_count"=>5}

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