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{"title"=>"Different Location Sampling Frequencies by Satellite Tags Yield Different Estimates of Migration Performance: Pooling Data Requires a Common Protocol", "type"=>"journal", "authors"=>[{"first_name"=>"Alessandro", "last_name"=>"Tanferna", "scopus_author_id"=>"8697610400"}, {"first_name"=>"Lidia", "last_name"=>"López-Jiménez", "scopus_author_id"=>"56594795600"}, {"first_name"=>"Julio", "last_name"=>"Blas", "scopus_author_id"=>"56147804000"}, {"first_name"=>"Fernando", "last_name"=>"Hiraldo", "scopus_author_id"=>"7003612699"}, {"first_name"=>"Fabrizio", "last_name"=>"Sergio", "scopus_author_id"=>"6603758246"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"23166742", "sgr"=>"84869101724", "doi"=>"10.1371/journal.pone.0049659", "scopus"=>"2-s2.0-84869101724", "pui"=>"366053726", "isbn"=>"1932-6203", "issn"=>"19326203"}, "id"=>"d1642254-1165-3186-8380-e3c105963784", "abstract"=>"BACKGROUND: Migration research is in rapid expansion and increasingly based on sophisticated satellite-tracking devices subject to constant technological refinement, but is still ripe with descriptive studies and in need of meta-analyses looking for emergent generalisations. In particular, coexistence of studies and devices with different frequency of location sampling and spatial accuracy generates doubts of data compatibility, potentially preventing meta-analyses. We used satellite-tracking data on a migratory raptor to: (1) test whether data based on different location sampling frequencies and on different position subsampling approaches are compatible, and (2) seek potential solutions that enhance compatibility and enable eventual meta-analyses.\\n\\nMETHODOLOGY/PRINCIPAL FINDINGS: We used linear mixed models to analyse the differences in the speed and route length of the migration tracks of 36 Black kites (Milvus migrans) satellite-tagged with two different types of devices (Argos vs GPS tags), entailing different regimes of position sampling frequency. We show that different location sampling frequencies and data subsampling approaches generate large (up to 33%) differences in the estimates of route length and migration speed of this migratory bird.\\n\\nCONCLUSIONS/SIGNIFICANCE: Our results show that the abundance of locations available for analysis affects the tortuosity and realism of the estimated migration path. To avoid flaws in future meta-analyses or unnecessary loss of data, we urge researchers to reach an agreement on a common protocol of data presentation, and to recognize that all transmitter-based studies are likely to underestimate the actual distance traveled by the marked animal. As ecological research becomes increasingly technological, new technologies should be matched with improvements in analytical capacity that guarantee data compatibility.", "link"=>"http://www.mendeley.com/research/different-location-sampling-frequencies-satellite-tags-yield-different-estimates-migration-performan", "reader_count"=>39, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Student > Doctoral Student"=>1, "Researcher"=>13, "Student > Ph. D. Student"=>9, "Student > Master"=>7, "Other"=>4, "Student > Bachelor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Student > Doctoral Student"=>1, "Researcher"=>13, "Student > Ph. D. Student"=>9, "Student > Master"=>7, "Other"=>4, "Student > Bachelor"=>3}, "reader_count_by_subject_area"=>{"Engineering"=>1, "Unspecified"=>1, "Environmental Science"=>11, "Mathematics"=>1, "Agricultural and Biological Sciences"=>23, "Medicine and Dentistry"=>1, "Neuroscience"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Neuroscience"=>{"Neuroscience"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>23}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>1}, "Environmental Science"=>{"Environmental Science"=>11}}, "reader_count_by_country"=>{"United States"=>1, "Mexico"=>1, "France"=>1, "Spain"=>1}, "group_count"=>1}

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• http://doi.org/10.1080/03949370.2013.812147
• http://doi.org/10.1007/s00285-016-1005-5
• http://doi.org/10.1111/jav.01839
• http://doi.org/10.1080/21622965.2015.1005486
• http://doi.org/10.1016/j.anbehav.2017.07.011
• http://doi.org/10.1007/s00285-016-0969-5
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• {"files"=>["https://ndownloader.figshare.com/files/291310"], "description"=>"<div><h3>Background</h3><p>Migration research is in rapid expansion and increasingly based on sophisticated satellite-tracking devices subject to constant technological refinement, but is still ripe with descriptive studies and in need of meta-analyses looking for emergent generalisations. In particular, coexistence of studies and devices with different frequency of location sampling and spatial accuracy generates doubts of data compatibility, potentially preventing meta-analyses. We used satellite-tracking data on a migratory raptor to: (1) test whether data based on different location sampling frequencies and on different position subsampling approaches are compatible, and (2) seek potential solutions that enhance compatibility and enable eventual meta-analyses.</p> <h3>Methodology/Principal Findings</h3><p>We used linear mixed models to analyse the differences in the speed and route length of the migration tracks of 36 Black kites (<em>Milvus migrans</em>) satellite-tagged with two different types of devices (Argos vs GPS tags), entailing different regimes of position sampling frequency. We show that different location sampling frequencies and data subsampling approaches generate large (up to 33%) differences in the estimates of route length and migration speed of this migratory bird.</p> <h3>Conclusions/Significance</h3><p>Our results show that the abundance of locations available for analysis affects the tortuosity and realism of the estimated migration path. To avoid flaws in future meta-analyses or unnecessary loss of data, we urge researchers to reach an agreement on a common protocol of data presentation, and to recognize that all transmitter-based studies are likely to underestimate the actual distance traveled by the marked animal. As ecological research becomes increasingly technological, new technologies should be matched with improvements in analytical capacity that guarantee data compatibility.</p> </div>", "links"=>[], "tags"=>["sampling", "frequencies", "tags", "estimates", "pooling", "requires", "protocol"], "article_id"=>117349, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Different_Location_Sampling_Frequencies_by_Satellite_Tags_Yield_Different_Estimates_of_Migration_Performance_Pooling_Data_Requires_a_Common_Protocol__/117349", "title"=>"Different Location Sampling Frequencies by Satellite Tags Yield Different Estimates of Migration Performance: Pooling Data Requires a Common Protocol", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-11-14 02:02:29"}
• {"files"=>["https://ndownloader.figshare.com/files/543416"], "description"=>"<p>The percentage difference was calculated for each individual as “[route length (or speed) of GPS tag – route length (or speed) of Argos tag]/route length (or speed) of Argos tag. Approach 1: all available locations employed for analysis; Approach 2: all locations except nocturnal ones; Approach 3: a single diurnal location; Approach 4: a single nocturnal location (see <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049659#s4\" target=\"_blank\">Methods</a> for further details). Error bars represent 1 SE.</p>", "links"=>[], "tags"=>["36", "kites", "marked", "argos", "gps", "satellite-tracking", "types", "ways", "subsample", "locations"], "article_id"=>213894, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659.g001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Mean_migration_route_length_and_speed_A_of_36_Black_Kites_simultaneously_marked_with_an_Argos_grey_bars_and_GPS_black_bars_satellite_tracking_device_and_the_percentage_difference_between_the_two_types_of_device_B_according_to_four_different_ways_to_subsa/213894", "title"=>"Mean migration route length and speed (A) of 36 Black Kites simultaneously marked with an Argos (grey bars) and GPS (black bars) satellite-tracking device, and the percentage difference between the two types of device (B), according to four different ways to subsample the locations for analysis.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-11-14 01:04:54"}
• {"files"=>["https://ndownloader.figshare.com/files/543560"], "description"=>"<p>In panels A and B, locations were subsampled using Approach 1 (all locations used for analysis), while in panels C and D, locations were subsampled using Approach 3 (one location per day), Kites were tagged in Doñana National Park (south-western Spain): its location in Europe is portrayed in the inset. The grey, Argos routes are systematically based on fewer locations and thus composed of fewer straighter segments, resulting in shorter, less tortuous routes and lower migration speeds.</p>", "links"=>[], "tags"=>["paths", "kites", "assessed", "gps", "argos", "employing", "classes"], "article_id"=>214050, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659.g002"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Example_of_migration_paths_of_four_different_individual_Black_Kites_as_assessed_for_each_one_by_a_GPS_tag_black_line_and_an_Argos_tag_grey_line_employing_Argos_Location_Classes_0_8211_3_/214050", "title"=>"Example of migration paths of four different individual Black Kites as assessed for each one by a GPS tag (black line) and an Argos tag (grey line employing Argos Location Classes 0–3).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-11-14 01:07:30"}
• {"files"=>["https://ndownloader.figshare.com/files/543688"], "description"=>"a<p>n = mean number of locations/tag on which the estimate is based; min = minimum number of locations/tag on which the estimate is based; max = maximum number of locations/tag on which the estimate is based.</p>", "links"=>[], "tags"=>["t-tests", "comparing", "36", "kites", "equipped", "argos", "gps", "satellite-tracking", "devices", "subsampling", "approaches"], "article_id"=>214168, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659.t001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Paired_t_tests_comparing_the_route_length_and_migration_speed_of_36_Black_Kites_equipped_with_Argos_vs_GPS_satellite_tracking_devices_for_each_of_four_data_subsampling_approaches_details_in_methods_/214168", "title"=>"Paired t-tests comparing the route length and migration speed of 36 Black Kites equipped with Argos vs GPS satellite-tracking devices for each of four data subsampling approaches (details in methods).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-11-14 01:09:28"}
• {"files"=>["https://ndownloader.figshare.com/files/543717"], "description"=>"<p>Parameter estimates and details of the most competitive models of <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049659#pone-0049659-t002\" target=\"_blank\">Table 2</a>, depicting the relationship between the route length (1) or migration speed (2) of 36 satellite-tagged Black Kites and Device Type (Argos vs GPS) and data filtering Approach (Approach 1–4).</p>", "links"=>[], "tags"=>["estimates", "details", "models", "depicting", "36", "satellite-tagged", "kites", "filtering"], "article_id"=>214205, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659.t003"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Parameter_estimates_and_details_of_the_most_competitive_models_of_Table_2_depicting_the_relationship_between_the_route_length_1_or_migration_speed_2_of_36_satellite_tagged_Black_Kites_and_Device_Type_Argos_vs_GPS_and_data_filtering_Approach_Approach_1_4_/214205", "title"=>"Parameter estimates and details of the most competitive models of Table 2, depicting the relationship between the route length (1) or migration speed (2) of 36 satellite-tagged Black Kites and Device Type (Argos vs GPS) and data filtering Approach (Approach 1–4).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-11-14 01:10:05"}
• {"files"=>["https://ndownloader.figshare.com/files/543760"], "description"=>"a<p>Dychotomic variable: Argos tag vs GPS tag.</p>b<p>Categorical variable: 1 = all locations employed for analysis (Approach 1); 2 = all locations except nocturnal ones (Approach 2); 3 = a single diurnal location employed for analysis (Approach 3); 4 = a single nocturnal location (Approach 4). See <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0049659#s4\" target=\"_blank\">Methods</a> for further details.</p>", "links"=>[], "tags"=>["models", "satellite-tracked", "kites", "tagging", "argos", "subsampling"], "article_id"=>214245, "categories"=>["Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Alessandro Tanferna", "Lidia López-Jiménez", "Julio Blas", "Fernando Hiraldo", "Fabrizio Sergio"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0049659.t002"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Linear_mixed_models_LMMs_of_route_length_a_and_migration_speed_b_by_satellite_tracked_Black_Kites_on_type_of_tagging_device_Device_Type_Argos_vs_GPS_and_data_subsampling_approach_Approach_1_to_4_see_Methods_/214245", "title"=>"Linear mixed models (LMMs) of route length (a) and migration speed (b) by satellite-tracked Black Kites on type of tagging device (“Device Type”: Argos vs GPS) and data subsampling approach (“Approach”: 1 to 4, see Methods).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-11-14 01:10:45"}

PMC Usage Stats | Further Information

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Relative Metric

{"start_date"=>"2012-01-01T00:00:00Z", "end_date"=>"2012-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences/Behavior", "average_usage"=>[354, 559, 676, 770, 854, 949, 1040, 1128, 1220, 1295, 1364, 1439, 1511, 1580, 1636, 1693, 1753, 1808, 1882, 1944, 2019, 2070, 2120, 2176, 2247]}, {"subject_area"=>"/Biology and life sciences/Evolutionary biology", "average_usage"=>[366, 574, 695, 795, 885, 973, 1063, 1148, 1233, 1319, 1389, 1459, 1533, 1611, 1685, 1754, 1820, 1882, 1937, 2001, 2071, 2129, 2219, 2273, 2335]}, {"subject_area"=>"/Biology and life sciences/Zoology", "average_usage"=>[360, 554, 661, 756, 829, 913, 992, 1072, 1144, 1228, 1306, 1378, 1439, 1500, 1558, 1627, 1689, 1754, 1826, 1892, 1951, 2009, 2067, 2130, 2200]}, {"subject_area"=>"/Ecology and environmental sciences/Ecology", "average_usage"=>[347, 547, 641, 742, 836, 927, 1016, 1099, 1184, 1267, 1348, 1418, 1484, 1555, 1631, 1705, 1788, 1843, 1917, 1985, 2052, 2115, 2190, 2258, 2333]}]}

F1000Prime