To See or Not to See: Investigating Detectability of Ganges River Dolphins Using a Combined Visual-Acoustic Survey
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{"title"=>"To see or not to see: Investigating detectability of ganges river dolphins using a combined visual-acoustic survey", "type"=>"journal", "authors"=>[{"first_name"=>"Nadia I.", "last_name"=>"Richman", "scopus_author_id"=>"37026947600"}, {"first_name"=>"James M.", "last_name"=>"Gibbons", "scopus_author_id"=>"7201472907"}, {"first_name"=>"Samuel T.", "last_name"=>"Turvey", "scopus_author_id"=>"8608216100"}, {"first_name"=>"Tomonari", "last_name"=>"Akamatsu", "scopus_author_id"=>"7101930604"}, {"first_name"=>"Benazir", "last_name"=>"Ahmed", "scopus_author_id"=>"14013119500"}, {"first_name"=>"Emile", "last_name"=>"Mahabub", "scopus_author_id"=>"56160086000"}, {"first_name"=>"Brian D.", "last_name"=>"Smith", "scopus_author_id"=>"56325729900"}, {"first_name"=>"Julia P.G.", "last_name"=>"Jones", "scopus_author_id"=>"55388537800"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "scopus"=>"2-s2.0-84900553774", "pui"=>"373094201", "doi"=>"10.1371/journal.pone.0096811", "isbn"=>"1932-6203", "sgr"=>"84900553774", "pmid"=>"24805782"}, "id"=>"1274612e-a26f-3703-8257-6d17ad420a0d", "abstract"=>"Detection of animals during visual surveys is rarely perfect or constant, and failure to account for imperfect detectability affects the accuracy of abundance estimates. Freshwater cetaceans are among the most threatened group of mammals, and visual surveys are a commonly employed method for estimating population size despite concerns over imperfect and unquantified detectability. We used a combined visual-acoustic survey to estimate detectability of Ganges River dolphins (Platanista gangetica gangetica) in four waterways of southern Bangladesh. The combined visual-acoustic survey resulted in consistently higher detectability than a single observer-team visual survey, thereby improving power to detect trends. Visual detectability was particularly low for dolphins close to meanders where these habitat features temporarily block the view of the preceding river surface. This systematic bias in detectability during visual-only surveys may lead researchers to underestimate the importance of heavily meandering river reaches. Although the benefits of acoustic surveys are increasingly recognised for marine cetaceans, they have not been widely used for monitoring abundance of freshwater cetaceans due to perceived costs and technical skill requirements. We show that acoustic surveys are in fact a relatively cost-effective approach for surveying freshwater cetaceans, once it is acknowledged that methods that do not account for imperfect detectability are of limited value for monitoring.", "link"=>"http://www.mendeley.com/research/see-not-see-investigating-detectability-ganges-river-dolphins-using-combined-visualacoustic-survey", "reader_count"=>76, "reader_count_by_academic_status"=>{"Researcher"=>18, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>15, "Student > Postgraduate"=>2, "Student > Master"=>13, "Other"=>8, "Student > Bachelor"=>8, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_user_role"=>{"Researcher"=>18, "Student > Doctoral Student"=>6, "Student > Ph. D. Student"=>15, "Student > Postgraduate"=>2, "Student > Master"=>13, "Other"=>8, "Student > Bachelor"=>8, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>2, "Environmental Science"=>18, "Biochemistry, Genetics and Molecular Biology"=>1, "Agricultural and Biological Sciences"=>47, "Physics and Astronomy"=>1, "Earth and Planetary Sciences"=>3, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>2}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>3}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>47}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>18}}, "reader_count_by_country"=>{"Argentina"=>1, "Mexico"=>1, "United Kingdom"=>4, "Germany"=>1, "Nepal"=>1, "India"=>1}, "group_count"=>8}

Scopus | Further Information

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  • {"files"=>["https://ndownloader.figshare.com/files/1488165"], "description"=>"<p>Illustration of the visual and acoustic survey set-up, and measurements necessary for matching visual and acoustic detections including: time of visual detection (<i>T<sub>v</sub></i>), time of acoustic detection (<i>T<sub>a</sub></i>), time difference between time of visual detection and time of acoustic detection (<i>T<sub>d</sub></i>), radial distance of dolphin from observer (<i>D<sub>r</sub></i>), adjusted visual time (<i>T<sub>adjv</sub></i>), straight distance between dolphin and observer (<i>D<sub>ov</sub></i>), vessel speed (<i>S<sub>v</sub></i>), and distance between furthest acoustic data logger and observer (<i>D<sub>oa</sub></i>).</p>", "links"=>[], "tags"=>["Computational biology", "Population modeling", "ecology", "Ecological metrics", "Extinction risk", "Population growth", "Freshwater ecology", "Evolutionary biology", "Evolutionary processes", "Species extinction", "Population biology", "Conservation science", "acoustic", "details", "taken", "matching"], "article_id"=>1019031, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Nadia I. Richman", "James M. Gibbons", "Samuel T. Turvey", "Tomonari Akamatsu", "Benazir Ahmed", "Emile Mahabub", "Brian D. Smith", "Julia P. G. Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0096811.g001", "stats"=>{"downloads"=>0, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Schematic_of_the_visual_and_acoustic_survey_set_up_with_details_of_measurements_taken_for_matching_detections_/1019031", "title"=>"Schematic of the visual and acoustic survey set-up, with details of measurements taken for matching detections.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-05-07 02:55:29"}
  • {"files"=>["https://ndownloader.figshare.com/files/1488166"], "description"=>"<p>Trace of click trains from two Ganges River dolphins as they pass in a bow-to-stern direction illustrated using the time difference (µs) in inter-click interval (bottom image) and sound pressure level (top image).</p>", "links"=>[], "tags"=>["Computational biology", "Population modeling", "ecology", "Ecological metrics", "Extinction risk", "Population growth", "Freshwater ecology", "Evolutionary biology", "Evolutionary processes", "Species extinction", "Population biology", "Conservation science", "inter-click", "ganges", "dolphin"], "article_id"=>1019032, "categories"=>["Biological Sciences", "Ecology"], "users"=>["Nadia I. Richman", "James M. Gibbons", "Samuel T. Turvey", "Tomonari Akamatsu", "Benazir Ahmed", "Emile Mahabub", "Brian D. Smith", "Julia P. G. Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0096811.g002", "stats"=>{"downloads"=>1, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Patterns_in_sound_pressure_level_and_inter_click_interval_of_Ganges_River_dolphin_clicks_/1019032", "title"=>"Patterns in sound pressure level and inter-click interval of Ganges River dolphin clicks.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-05-07 02:55:29"}

PMC Usage Stats | Further Information

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Relative Metric

{"start_date"=>"2014-01-01T00:00:00Z", "end_date"=>"2014-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences", "average_usage"=>[291]}, {"subject_area"=>"/Biology and life sciences/Organisms", "average_usage"=>[310]}, {"subject_area"=>"/Biology and life sciences/Psychology", "average_usage"=>[307]}, {"subject_area"=>"/Earth sciences", "average_usage"=>[318]}, {"subject_area"=>"/Earth sciences/Marine and aquatic sciences", "average_usage"=>[343]}, {"subject_area"=>"/Ecology and environmental sciences", "average_usage"=>[320]}, {"subject_area"=>"/Engineering and technology/Transportation", "average_usage"=>[300]}, {"subject_area"=>"/Social sciences/Psychology", "average_usage"=>[314, 476]}]}
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