Inferring Foraging Areas of Nesting Loggerhead Turtles Using Satellite Telemetry and Stable Isotopes
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{"title"=>"Inferring Foraging Areas of Nesting Loggerhead Turtles Using Satellite Telemetry and Stable Isotopes", "type"=>"journal", "authors"=>[{"first_name"=>"Simona A.", "last_name"=>"Ceriani", "scopus_author_id"=>"6603287816"}, {"first_name"=>"James D.", "last_name"=>"Roth", "scopus_author_id"=>"7404379448"}, {"first_name"=>"Daniel R.", "last_name"=>"Evans", "scopus_author_id"=>"57190777887"}, {"first_name"=>"John F.", "last_name"=>"Weishampel", "scopus_author_id"=>"6701468292"}, {"first_name"=>"Llewellyn M.", "last_name"=>"Ehrhart", "scopus_author_id"=>"7003538878"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-84866640558", "sgr"=>"84866640558", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0045335", "pmid"=>"23028943", "pui"=>"365718537"}, "id"=>"21378050-7e89-3ac6-a057-c168a724edf9", "abstract"=>"In recent years, the use of intrinsic markers such as stable isotopes to link breeding and foraging grounds of migratory species has increased. Nevertheless, several assumptions still must be tested to interpret isotopic patterns found in the marine realm. We used a combination of satellite telemetry and stable isotope analysis to (i) identify key foraging grounds used by female loggerheads nesting in Florida and (ii) examine the relationship between stable isotope ratios and post-nesting migration destinations. We collected tissue samples for stable isotope analysis from 14 females equipped with satellite tags and an additional 57 untracked nesting females. Telemetry identified three post-nesting migratory pathways and associated non-breeding foraging grounds: (1) a seasonal continental shelf-constrained migratory pattern along the northeast U.S. coastline, (2) a non-breeding residency in southern foraging areas and (3) a residency in the waters adjacent to the breeding area. Isotopic variability in both δ(13)C and δ(15)N among individuals allowed identification of three distinct foraging aggregations. We used discriminant function analysis to examine how well δ(13)C and δ(15)N predict female post-nesting migration destination. The discriminant analysis classified correctly the foraging ground used for all but one individual and was used to predict putative feeding areas of untracked turtles. We provide the first documentation that the continental shelf of the Mid- and South Atlantic Bights are prime foraging areas for a large number (61%) of adult female loggerheads from the largest loggerhead nesting population in the western hemisphere and the second largest in the world. Our findings offer insights for future management efforts and suggest that this technique can be used to infer foraging strategies and residence areas in lieu of more expensive satellite telemetry, enabling sample sizes that are more representative at the population level.", "link"=>"http://www.mendeley.com/research/inferring-foraging-areas-nesting-loggerhead-turtles-using-satellite-telemetry-stable-isotopes", "reader_count"=>122, "reader_count_by_academic_status"=>{"Unspecified"=>4, "Professor > Associate Professor"=>6, "Researcher"=>27, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>29, "Student > Postgraduate"=>2, "Student > Master"=>28, "Other"=>11, "Student > Bachelor"=>11, "Lecturer"=>2, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>4, "Professor > Associate Professor"=>6, "Researcher"=>27, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>29, "Student > Postgraduate"=>2, "Student > Master"=>28, "Other"=>11, "Student > Bachelor"=>11, "Lecturer"=>2, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>4, "Environmental Science"=>25, "Biochemistry, Genetics and Molecular Biology"=>3, "Mathematics"=>1, "Agricultural and Biological Sciences"=>82, "Arts and Humanities"=>1, "Physics and Astronomy"=>1, "Earth and Planetary Sciences"=>5}, "reader_count_by_subdiscipline"=>{"Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>5}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>82}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>3}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>4}, "Environmental Science"=>{"Environmental Science"=>25}, "Arts and Humanities"=>{"Arts and Humanities"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Argentina"=>1, "Uruguay"=>1, "United States"=>3, "Brazil"=>3, "Mexico"=>1, "Germany"=>1}, "group_count"=>6}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/302316", "https://ndownloader.figshare.com/files/302373", "https://ndownloader.figshare.com/files/302414"], "description"=>"<div><p>In recent years, the use of intrinsic markers such as stable isotopes to link breeding and foraging grounds of migratory species has increased. Nevertheless, several assumptions still must be tested to interpret isotopic patterns found in the marine realm. We used a combination of satellite telemetry and stable isotope analysis to (i) identify key foraging grounds used by female loggerheads nesting in Florida and (ii) examine the relationship between stable isotope ratios and post-nesting migration destinations. We collected tissue samples for stable isotope analysis from 14 females equipped with satellite tags and an additional 57 untracked nesting females. Telemetry identified three post-nesting migratory pathways and associated non-breeding foraging grounds: (1) a seasonal continental shelf–constrained migratory pattern along the northeast U.S. coastline, (2) a non-breeding residency in southern foraging areas and (3) a residency in the waters adjacent to the breeding area. Isotopic variability in both δ<sup>13</sup>C and δ<sup>15</sup>N among individuals allowed identification of three distinct foraging aggregations. We used discriminant function analysis to examine how well δ<sup>13</sup>C and δ<sup>15</sup>N predict female post-nesting migration destination. The discriminant analysis classified correctly the foraging ground used for all but one individual and was used to predict putative feeding areas of untracked turtles. We provide the first documentation that the continental shelf of the Mid- and South Atlantic Bights are prime foraging areas for a large number (61%) of adult female loggerheads from the largest loggerhead nesting population in the western hemisphere and the second largest in the world. Our findings offer insights for future management efforts and suggest that this technique can be used to infer foraging strategies and residence areas <em>in lieu</em> of more expensive satellite telemetry, enabling sample sizes that are more representative at the population level.</p> </div>", "links"=>[], "tags"=>["inferring", "foraging", "areas", "nesting", "loggerhead", "turtles", "telemetry", "isotopes"], "article_id"=>119618, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0045335.s001", "https://dx.doi.org/10.1371/journal.pone.0045335.s002", "https://dx.doi.org/10.1371/journal.pone.0045335.s003"], "stats"=>{"downloads"=>2, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Inferring_Foraging_Areas_of_Nesting_Loggerhead_Turtles_Using_Satellite_Telemetry_and_Stable_Isotopes/119618", "title"=>"Inferring Foraging Areas of Nesting Loggerhead Turtles Using Satellite Telemetry and Stable Isotopes", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2012-09-20 02:40:18"}
  • {"files"=>["https://ndownloader.figshare.com/files/573424"], "description"=>"<p>RBC δ<sup>13</sup>C (A) and δ<sup>15</sup>N (B) values of satellite-tracked adult female loggerheads (n = 14) versus mean latitudes of winter foraging areas calculated based on satellite telemetry. Blue diamonds represent individuals migrating to southern foraging grounds (southern), green squares females residing in eastern central Florida (resident) and pink triangles females that migrated to northern foraging areas (northern). Only northern loggerheads undertook seasonal migration between winter and summer foraging ground. In the case of northern females, the latitude plotted represents the average latitude of the winter foraging area for each individual. The remaining eight females did not show seasonal movement; therefore, the latitude plotted represents the average latitude of the year-round foraging area. Dashed blue and black lines indicate 95% confidence and predictive interval (respectively) for the regression analysis.</p>", "links"=>[], "tags"=>["rbc", "isotope", "ratios", "post-nesting", "foraging"], "article_id"=>243914, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.g003", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationship_between_RBC_stable_isotope_ratios_and_post_nesting_foraging_ground_location_/243914", "title"=>"Relationship between RBC stable isotope ratios and post-nesting foraging ground location.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-09-20 01:05:14"}
  • {"files"=>["https://ndownloader.figshare.com/files/573618"], "description"=>"<p>Pink triangles represent females equipped with satellite tags that migrated to northern foraging areas, green squares those foraging in eastern central Florida, blue diamonds those foraging in the south, while empty circles represent untracked females. The arrow indicates turtle “k”, which foraged in the SE Gulf of Mexico. The δ<sup>13</sup>C and δ<sup>15</sup>N values of this individual were extremely similar to the ones found in eastern central Florida residents, while the average latitude of the foraging ground used by this female for almost two years was intermediate between residents and the other southern individuals. RBC stable isotope ratios of untracked females (n = 57) have a similar distribution pattern to the 14 satellite-tracked loggerheads.</p>", "links"=>[], "tags"=>["71", "nesting", "loggerhead", "turtles", "sampled", "carr", "florida"], "article_id"=>244108, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.g004", "stats"=>{"downloads"=>3, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Scatterplot_of_13_C_and_948_15_N_values_for_the_71_nesting_loggerhead_turtles_sampled_at_the_Carr_NWR_Florida_USA_/244108", "title"=>"Scatterplot of δ<sup>13</sup>C and δ<sup>15</sup>N values for the 71 nesting loggerhead turtles sampled at the Carr NWR, Florida (USA).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-09-20 01:08:28"}
  • {"files"=>["https://ndownloader.figshare.com/files/574140"], "description"=>"<p>Model selection used Akaike’s Information Criterion, corrected for small sample sizes (AIC<sub>c</sub>). Abbreviations are as follow: RSS  =  residual sum of squares, N  =  number of observations, K  =  number of parameters, ΔAIC<sub>c</sub>  =  difference between each model and the best model, AIC<sub>c</sub> weight  =  relative information content, P  =  probability associated with the best model, lat  =  average latitude of foraging ground based on tracking data, dist shore  =  distance from shore (in km) calculated from the point having as coordinates average latitude and longitude of foraging ground, lat * dist shore  =  lat + dist shore + lat * dist shore.</p>", "links"=>[], "tags"=>["linear", "regression", "models", "describing", "rbc", "geographic", "non-breeding", "foraging", "areas", "14", "loggerheads", "fitted"], "article_id"=>244618, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.t003", "stats"=>{"downloads"=>0, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_linear_regression_models_describing_the_relationship_between_RBC_13_C_and_948_15_N_and_geographic_location_of_summer_non_breeding_foraging_areas_for_the_14_loggerheads_fitted_with_satellite_tags_/244618", "title"=>"Comparison of linear regression models describing the relationship between RBC δ<sup>13</sup>C and δ<sup>15</sup>N and geographic location of summer non-breeding foraging areas for the 14 loggerheads fitted with satellite tags.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-09-20 01:16:58"}
  • {"files"=>["https://ndownloader.figshare.com/files/573232"], "description"=>"<p>(A) Displacement pattern of a turtle that followed the northern strategy and migrated between summer and winter foraging areas (turtle a, see <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045335#pone-0045335-t001\" target=\"_blank\">Table 1</a> for details). Females following the northern strategy moved between summer foraging grounds in the Mid-Atlantic Bight (MAB) off the Delmarva Peninsula and winter foraging grounds located in the waters off North Carolina. (B) Displacement pattern of a turtle that took up year-round residence in the Great Bahamas Bank and did not show seasonal migration (turtle l). Phases of migration are represented by rapid changes in displacement distance; summer, winter and year-round foraging areas can be seen where displacement values plateau.</p>", "links"=>[], "tags"=>["loggerheads", "equipped"], "article_id"=>243724, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.g001", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Displacement_from_release_site_plot_of_loggerheads_equipped_with_satellite_tags_/243724", "title"=>"Displacement from release site plot of loggerheads equipped with satellite tags.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-09-20 01:02:04"}
  • {"files"=>["https://ndownloader.figshare.com/files/573308"], "description"=>"<p>(A) Reconstructed route (pink, green and blue lines) to foraging areas (labeled circles) for individuals <i>a</i> to <i>n</i> from release location (black star). Loggerheads were classified into three migratory groups: northern (a to f), central Florida resident (g to j) and southern (k to n). Pink, green and blue reconstructed routes represent northern, resident and southern migratory groups, respectively. (B) Reconstructed route (pink lines) from summer foraging areas (darker pink-labeled circles) to wintering areas (lighter pink-labeled circles) for individuals that followed the northern strategy (a to f). The 200 m isobath is delineated (black line). Dotted line separates Mid-Atlantic Bight (MAB) and South-Atlantic Bight (SAB). A bight is defined as a long, gradual bend or recess in the coastline that forms a large, open bay. The MAB is defined as the region enclosed by the coastline from Cape Cod (MA), to Cape Hatteras (NC). The SAB extends from Cape Hatteras (NC) to West Palm Beach (FL).</p>", "links"=>[], "tags"=>["tracks", "loggerheads", "tagged", "nesting", "carr"], "article_id"=>243795, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.g002", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Reconstructed_satellite_tracks_n_8202_8202_14_of_loggerheads_tagged_after_nesting_at_the_Carr_NWR_/243795", "title"=>"Reconstructed satellite tracks (n = 14) of loggerheads tagged after nesting at the Carr NWR.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-09-20 01:03:15"}
  • {"files"=>["https://ndownloader.figshare.com/files/573844"], "description"=>"<p>Function 1 accounted for 97.6% of the between-group variability. Pink triangles represent females equipped with satellite tags that migrated to northern foraging areas, green squares those foraging in eastern central Florida and blue diamonds those foraging in the south. Black markers represent the centroids for the respective foraging groups. Empty circles represent untracked females. Dotted lines define the three DFA territories.</p>", "links"=>[], "tags"=>["foraging", "groups", "isotope"], "article_id"=>244343, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.g005", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Discriminant_function_analysis_DFA_of_foraging_groups_based_on_the_stable_isotope_ratios_/244343", "title"=>"Discriminant function analysis (DFA) of foraging groups based on the stable isotope ratios.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-09-20 01:12:23"}
  • {"files"=>["https://ndownloader.figshare.com/files/574170"], "description"=>"<p>Number and % of loggerheads assigned to each foraging ground based on the classification results. Observed classes are in rows, predicted in columns. We used δ<sup>13</sup>C and δ<sup>15</sup>N values of the females equipped with satellite tags (n = 14) as training data set to develop the discriminant functions and the untracked turtles (n = 57) as test data set for the discriminant classification. 92.9% of original and of cross-validated grouped cases were classified correctly. Only one southern individual (turtle ID k, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045335#pone-0045335-t001\" target=\"_blank\">Table 1</a>) was misclassified and assigned to the central group.</p>", "links"=>[], "tags"=>["discriminant", "loggerhead"], "article_id"=>244664, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.t004", "stats"=>{"downloads"=>0, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Foraging_ground_assignment_number_and_for_the_discriminant_model_based_on_13_C_and_948_15_N_values_of_loggerhead_RBCs_/244664", "title"=>"Foraging ground assignment (number and %) for the discriminant model based on δ<sup>13</sup>C and δ<sup>15</sup>N values of loggerhead RBCs.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-09-20 01:17:44"}
  • {"files"=>["https://ndownloader.figshare.com/files/574088"], "description"=>"<p>Model selection used Akaike’s Information Criterion, corrected for small sample sizes (AIC<sub>c</sub>). Abbreviations are as follow: RSS  =  residual sum of squares, N  =  number of observations, K  =  number of parameters, ΔAIC<sub>c</sub>  =  difference between each model and the best model, AIC<sub>c</sub> weight  =  relative information content, P  =  probability associated with the best model, lat  =  average latitude of foraging ground based on tracking data, dist shore  =  distance from shore (in km) calculated from the point having as coordinates average latitude and longitude of foraging ground, lat * dist shore  =  lat + dist shore + lat * dist shore.</p>", "links"=>[], "tags"=>["linear", "regression", "models", "describing", "rbc", "geographic", "non-breeding", "foraging", "areas", "14", "loggerheads", "fitted"], "article_id"=>244573, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.t002", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_linear_regression_models_describing_the_relationship_between_RBC_13_C_and_948_15_N_and_geographic_location_of_winter_non_breeding_foraging_areas_for_the_14_loggerheads_fitted_with_satellite_tags_/244573", "title"=>"Comparison of linear regression models describing the relationship between RBC δ<sup>13</sup>C and δ<sup>15</sup>N and geographic location of winter non-breeding foraging areas for the 14 loggerheads fitted with satellite tags.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-09-20 01:16:13"}
  • {"files"=>["https://ndownloader.figshare.com/files/574053"], "description"=>"<p>Abbreviations are as follow: platform terminal transmitter (PTT), day (d), Mid-Atlantic Bight (MAB), South-Atlantic Bight (SAB), South East Gulf of Mexico (SE GoM), Florida Keys (FL Keys).</p>", "links"=>[], "tags"=>["tracking", "foraging", "14", "satellite-tracked"], "article_id"=>244543, "categories"=>["Physiology", "Inorganic Chemistry"], "users"=>["Simona A. Ceriani", "James D. Roth", "Daniel R. Evans", "John F. Weishampel", "Llewellyn M. Ehrhart"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0045335.t001", "stats"=>{"downloads"=>0, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Information_on_satellite_tracking_and_foraging_area_of_choice_of_14_satellite_tracked_loggerheads_/244543", "title"=>"Information on satellite tracking and foraging area of choice of 14 satellite-tracked loggerheads.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2012-09-20 01:15:43"}

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Relative Metric

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