A Bird’s Eye View of Discard Reforms: Bird-Borne Cameras Reveal Seabird/Fishery Interactions
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{"title"=>"A Bird's Eye View of Discard Reforms: Bird-Borne Cameras Reveal Seabird/Fishery Interactions", "type"=>"journal", "authors"=>[{"first_name"=>"Stephen C.", "last_name"=>"Votier", "scopus_author_id"=>"6602631908"}, {"first_name"=>"Anthony", "last_name"=>"Bicknell", "scopus_author_id"=>"39361011800"}, {"first_name"=>"Samantha L.", "last_name"=>"Cox", "scopus_author_id"=>"55614945800"}, {"first_name"=>"Kylie L.", "last_name"=>"Scales", "scopus_author_id"=>"51665709700"}, {"first_name"=>"Samantha C.", "last_name"=>"Patrick", "scopus_author_id"=>"35316539200"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"368465827", "sgr"=>"84874625814", "issn"=>"19326203", "pmid"=>"23483906", "scopus"=>"2-s2.0-84874625814", "doi"=>"10.1371/journal.pone.0057376", "isbn"=>"1932-6203"}, "id"=>"a3cdb2ff-ead6-32a8-9d9a-a162f8cce17c", "abstract"=>"<p>Commercial capture fisheries produce huge quantities of offal, as well as undersized and unwanted catch in the form of discards. Declines in global catches and legislation to ban discarding will significantly reduce discards, but this subsidy supports a large scavenger community. Understanding the potential impact of declining discards for scavengers should feature in an eco-system based approach to fisheries management, but requires greater knowledge of scavenger/fishery interactions. Here we use bird-borne cameras, in tandem with GPS loggers, to provide a unique view of seabird/fishery interactions. 20,643 digital images (one min<sup>−1</sup>) from ten bird-borne cameras deployed on central place northern gannets <italic>Morus bassanus</italic> revealed that all birds photographed fishing vessels. These were large (&gt;15 m) boats, with no small-scale vessels. Virtually all vessels were trawlers, and gannets were almost always accompanied by other scavenging birds. All individuals exhibited an Area-Restricted Search (ARS) during foraging, but only 42% of ARS were associated with fishing vessels, indicating much ‘natural’ foraging. The proportion of ARS behaviours associated with fishing boats were higher for males (81%) than females (30%), although the reasons for this are currently unclear. Our study illustrates that fisheries form a very important component of the prey-landscape for foraging gannets and that a discard ban, such as that proposed under reforms of the EU Common Fisheries Policy, may have a significant impact on gannet behaviour, particularly males. However, a continued reliance on ‘natural’ foraging suggests the ability to switch away from scavenging, but only if there is sufficient food to meet their needs in the absence of a discard subsidy.</p>", "link"=>"http://www.mendeley.com/research/birds-eye-view-discard-reforms-birdborne-cameras-reveal-seabirdfishery-interactions", "reader_count"=>161, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>2, "Researcher"=>35, "Student > Ph. D. Student"=>49, "Student > Postgraduate"=>7, "Student > Master"=>37, "Other"=>7, "Student > Bachelor"=>14, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>2, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>2, "Researcher"=>35, "Student > Ph. D. Student"=>49, "Student > Postgraduate"=>7, "Student > Master"=>37, "Other"=>7, "Student > Bachelor"=>14, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>2, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>5, "Environmental Science"=>30, "Biochemistry, Genetics and Molecular Biology"=>2, "Agricultural and Biological Sciences"=>118, "Medicine and Dentistry"=>1, "Chemistry"=>2, "Social Sciences"=>1, "Earth and Planetary Sciences"=>1, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Chemistry"=>{"Chemistry"=>2}, "Social Sciences"=>{"Social Sciences"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>118}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Unspecified"=>{"Unspecified"=>5}, "Environmental Science"=>{"Environmental Science"=>30}}, "reader_count_by_country"=>{"Belgium"=>1, "United States"=>2, "Brazil"=>1, "United Kingdom"=>7, "Italy"=>1, "South Africa"=>2, "Israel"=>1, "Portugal"=>1, "Germany"=>2, "Spain"=>1}, "group_count"=>5}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/978479"], "description"=>"<p>All tracked gannets photographed fishing vessels, often in the company of large groups of other scavengers.</p>", "links"=>[], "tags"=>["cameras"], "article_id"=>645440, "categories"=>["Inorganic Chemistry"], "users"=>["Stephen C. Votier", "Anthony Bicknell", "Samantha L. Cox", "Kylie L. Scales", "Samantha C. Patrick"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0057376.g001", "stats"=>{"downloads"=>2, "page_views"=>27, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Bird_borne_cameras_reveal_seabird_fishery_interactions_/645440", "title"=>"Bird-borne cameras reveal seabird/fishery interactions.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-03-07 08:26:14"}
  • {"files"=>["https://ndownloader.figshare.com/files/978484"], "description"=>"<p>93% of vessel encounters illustrated that northern gannets foraged with other birds, including conspecifics above (A) and below the water (B), as well as northern fulmars (<i>Fulmarus glacialis</i>) (C). Fishing vessels were visited during crepuscular foraging (D). The vast majority (95%) of fishing vessels encountered were trawlers, including stern trawlers (E) and beam trawlers (F).</p>", "links"=>[], "tags"=>["cameras", "intra-", "inter-specific"], "article_id"=>645445, "categories"=>["Inorganic Chemistry"], "users"=>["Stephen C. Votier", "Anthony Bicknell", "Samantha L. Cox", "Kylie L. Scales", "Samantha C. Patrick"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0057376.g002", "stats"=>{"downloads"=>0, "page_views"=>27, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Bird_borne_cameras_reveal_intra_and_inter_specific_interactions_and_fishing_vessel_type_/645445", "title"=>"Bird-borne cameras reveal intra- and inter-specific interactions, and fishing vessel type.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-03-07 08:27:48"}
  • {"files"=>["https://ndownloader.figshare.com/files/978491"], "description"=>"<div><p>Commercial capture fisheries produce huge quantities of offal, as well as undersized and unwanted catch in the form of discards. Declines in global catches and legislation to ban discarding will significantly reduce discards, but this subsidy supports a large scavenger community. Understanding the potential impact of declining discards for scavengers should feature in an eco-system based approach to fisheries management, but requires greater knowledge of scavenger/fishery interactions. Here we use bird-borne cameras, in tandem with GPS loggers, to provide a unique view of seabird/fishery interactions. 20,643 digital images (one min<sup>−1</sup>) from ten bird-borne cameras deployed on central place northern gannets <i>Morus bassanus</i> revealed that all birds photographed fishing vessels. These were large (>15 m) boats, with no small-scale vessels. Virtually all vessels were trawlers, and gannets were almost always accompanied by other scavenging birds. All individuals exhibited an Area-Restricted Search (ARS) during foraging, but only 42% of ARS were associated with fishing vessels, indicating much ‘natural’ foraging. The proportion of ARS behaviours associated with fishing boats were higher for males (81%) than females (30%), although the reasons for this are currently unclear. Our study illustrates that fisheries form a very important component of the prey-landscape for foraging gannets and that a discard ban, such as that proposed under reforms of the EU Common Fisheries Policy, may have a significant impact on gannet behaviour, particularly males. However, a continued reliance on ‘natural’ foraging suggests the ability to switch away from scavenging, but only if there is sufficient food to meet their needs in the absence of a discard subsidy.</p> </div>", "links"=>[], "tags"=>["discard", "bird-borne", "cameras", "interactions"], "article_id"=>645450, "categories"=>["Inorganic Chemistry"], "users"=>["Stephen C. Votier", "Anthony Bicknell", "Samantha L. Cox", "Kylie L. Scales", "Samantha C. Patrick"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0057376", "stats"=>{"downloads"=>3, "page_views"=>27, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/A_Bird_s_Eye_View_of_Discard_Reforms_Bird_Borne_Cameras_Reveal_Seabird_Fishery_Interactions__/645450", "title"=>"A Bird’s Eye View of Discard Reforms: Bird-Borne Cameras Reveal Seabird/Fishery Interactions", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-03-07 08:29:03"}
  • {"files"=>["https://ndownloader.figshare.com/files/978487"], "description"=>"<p>Figures show single foraging trips of four gannets reconstructed using fixes from GPS loggers. Open circles indicate location of area-restricted search (ARS) zones along the foraging track and are proportional to the scale of the ARS zone. Closed circles indicate the location of fishing vessels photographed by gannet-borne cameras. Arrows show the direction of travel and an asterix the location of the colony. Gannets showed a mixed foraging strategy, illustrated by ARS zones occurring with and without the fishing vessels. Males A & B foraged more at fishing boats compared with females C & D.</p>", "links"=>[], "tags"=>["cameras", "gps", "gannet", "behaviours"], "article_id"=>645447, "categories"=>["Inorganic Chemistry"], "users"=>["Stephen C. Votier", "Anthony Bicknell", "Samantha L. Cox", "Kylie L. Scales", "Samantha C. Patrick"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0057376.g003", "stats"=>{"downloads"=>1, "page_views"=>27, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Bird_borne_cameras_and_GPS_reveal_gannet_search_behaviours_in_relation_to_fishing_activity_/645447", "title"=>"Bird-borne cameras and GPS reveal gannet search behaviours in relation to fishing activity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-03-07 08:28:38"}

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Relative Metric

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