Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles
Stable isotope analysis can be used to infer geospatial linkages of highly migratory species. Identifying foraging grounds of marine organisms from their isotopic signatures is becoming de rigueur as it has been with terrestrial organisms. Sea turtles are being increasingly studied using a combinati...
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ftunicentralflor:oai:stars.library.ucf.edu:facultybib2010-6140 2023-05-15T17:45:32+02:00 Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles Ceriani, Simona A. Roth, James D. Sasso, Christopher R. McClellan, Catherine M. James, Michael C. Haas, Heather L. Smolowitz, Ronald J. Evans, Daniel R. Addison, David S. Bagley, Dean A. Ehrhart, Llewellyn M. Weishampel, John F. 2014-01-01T08:00:00Z application/pdf https://stars.library.ucf.edu/facultybib2010/5141 https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=6140&context=facultybib2010 English eng STARS https://stars.library.ucf.edu/facultybib2010/5141 https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=6140&context=facultybib2010 Faculty Bibliography 2010s carbon-13 Caretta caretta geographic assignment models isoscapes migratory connectivity Northwest Atlantic nitrogen-15 satellite telemetry stable isotopes CARETTA-CARETTA STABLE-ISOTOPES MARINE TURTLES BREEDING AGGREGATION SATELLITE TRACKING CARBON ISOTOPES FORAGING AREAS SOUTHERN-OCEAN LIFE-HISTORY ECOLOGY text 2014 ftunicentralflor 2021-12-21T09:30:07Z Stable isotope analysis can be used to infer geospatial linkages of highly migratory species. Identifying foraging grounds of marine organisms from their isotopic signatures is becoming de rigueur as it has been with terrestrial organisms. Sea turtles are being increasingly studied using a combination of satellite telemetry and stable isotope analysis; these studies along with those from other charismatic, highly vagile, and widely distributed species (e.g., tuna, billfish, sharks, dolphins, whales) have the potential to yield large datasets to develop methodologies to decipher migratory pathways in the marine realm. We collected tissue samples (epidermis and red blood cells) for carbon (delta C-13) and nitrogen (delta N-15) stable isotope analysis from 214 individual loggerheads (Caretta caretta) in the Northwest Atlantic Ocean (NWA). We used discriminant function analysis (DFA) to examine how well delta C-13 and delta N-15 classify loggerhead foraging areas. The DFA model was derived from isotopic signatures of 58 loggerheads equipped with satellite tags to identify foraging locations. We assessed model accuracy with the remaining 156 untracked loggerheads that were captured at their foraging locations. The DFA model correctly identified the foraging ground of 93.0% of individuals with a probability greater than 66.7%. The results of the external validation (1) confirm that assignment models based on tracked loggerheads in the NWA are robust and (2) provide the first independent evidence supporting the use of these models for migratory marine organisms. Additionally, we used these data to generate loggerhead-specific delta C-13 and delta N-15 isoscapes, the first for a predator in the Atlantic Ocean. We found a latitudinal trend of delta C-13 values with higher values in the southern region (20-25 degrees N) and a more complex pattern with delta N-15, with intermediate latitudes (30-35 degrees N) near large coastal estuaries having higher delta N-15-enrichment. These results indicate that this method with further refinement may provide a viable, more spatially-explicit option for identifying loggerhead foraging grounds. Text Northwest Atlantic Southern Ocean University of Central Florida (UCF): STARS (Showcase of Text, Archives, Research & Scholarship) Southern Ocean |
institution |
Open Polar |
collection |
University of Central Florida (UCF): STARS (Showcase of Text, Archives, Research & Scholarship) |
op_collection_id |
ftunicentralflor |
language |
English |
topic |
carbon-13 Caretta caretta geographic assignment models isoscapes migratory connectivity Northwest Atlantic nitrogen-15 satellite telemetry stable isotopes CARETTA-CARETTA STABLE-ISOTOPES MARINE TURTLES BREEDING AGGREGATION SATELLITE TRACKING CARBON ISOTOPES FORAGING AREAS SOUTHERN-OCEAN LIFE-HISTORY ECOLOGY |
spellingShingle |
carbon-13 Caretta caretta geographic assignment models isoscapes migratory connectivity Northwest Atlantic nitrogen-15 satellite telemetry stable isotopes CARETTA-CARETTA STABLE-ISOTOPES MARINE TURTLES BREEDING AGGREGATION SATELLITE TRACKING CARBON ISOTOPES FORAGING AREAS SOUTHERN-OCEAN LIFE-HISTORY ECOLOGY Ceriani, Simona A. Roth, James D. Sasso, Christopher R. McClellan, Catherine M. James, Michael C. Haas, Heather L. Smolowitz, Ronald J. Evans, Daniel R. Addison, David S. Bagley, Dean A. Ehrhart, Llewellyn M. Weishampel, John F. Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
topic_facet |
carbon-13 Caretta caretta geographic assignment models isoscapes migratory connectivity Northwest Atlantic nitrogen-15 satellite telemetry stable isotopes CARETTA-CARETTA STABLE-ISOTOPES MARINE TURTLES BREEDING AGGREGATION SATELLITE TRACKING CARBON ISOTOPES FORAGING AREAS SOUTHERN-OCEAN LIFE-HISTORY ECOLOGY |
description |
Stable isotope analysis can be used to infer geospatial linkages of highly migratory species. Identifying foraging grounds of marine organisms from their isotopic signatures is becoming de rigueur as it has been with terrestrial organisms. Sea turtles are being increasingly studied using a combination of satellite telemetry and stable isotope analysis; these studies along with those from other charismatic, highly vagile, and widely distributed species (e.g., tuna, billfish, sharks, dolphins, whales) have the potential to yield large datasets to develop methodologies to decipher migratory pathways in the marine realm. We collected tissue samples (epidermis and red blood cells) for carbon (delta C-13) and nitrogen (delta N-15) stable isotope analysis from 214 individual loggerheads (Caretta caretta) in the Northwest Atlantic Ocean (NWA). We used discriminant function analysis (DFA) to examine how well delta C-13 and delta N-15 classify loggerhead foraging areas. The DFA model was derived from isotopic signatures of 58 loggerheads equipped with satellite tags to identify foraging locations. We assessed model accuracy with the remaining 156 untracked loggerheads that were captured at their foraging locations. The DFA model correctly identified the foraging ground of 93.0% of individuals with a probability greater than 66.7%. The results of the external validation (1) confirm that assignment models based on tracked loggerheads in the NWA are robust and (2) provide the first independent evidence supporting the use of these models for migratory marine organisms. Additionally, we used these data to generate loggerhead-specific delta C-13 and delta N-15 isoscapes, the first for a predator in the Atlantic Ocean. We found a latitudinal trend of delta C-13 values with higher values in the southern region (20-25 degrees N) and a more complex pattern with delta N-15, with intermediate latitudes (30-35 degrees N) near large coastal estuaries having higher delta N-15-enrichment. These results indicate that this method with further refinement may provide a viable, more spatially-explicit option for identifying loggerhead foraging grounds. |
format |
Text |
author |
Ceriani, Simona A. Roth, James D. Sasso, Christopher R. McClellan, Catherine M. James, Michael C. Haas, Heather L. Smolowitz, Ronald J. Evans, Daniel R. Addison, David S. Bagley, Dean A. Ehrhart, Llewellyn M. Weishampel, John F. |
author_facet |
Ceriani, Simona A. Roth, James D. Sasso, Christopher R. McClellan, Catherine M. James, Michael C. Haas, Heather L. Smolowitz, Ronald J. Evans, Daniel R. Addison, David S. Bagley, Dean A. Ehrhart, Llewellyn M. Weishampel, John F. |
author_sort |
Ceriani, Simona A. |
title |
Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
title_short |
Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
title_full |
Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
title_fullStr |
Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
title_full_unstemmed |
Modeling and mapping isotopic patterns in the Northwest Atlantic derived from loggerhead sea turtles |
title_sort |
modeling and mapping isotopic patterns in the northwest atlantic derived from loggerhead sea turtles |
publisher |
STARS |
publishDate |
2014 |
url |
https://stars.library.ucf.edu/facultybib2010/5141 https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=6140&context=facultybib2010 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Northwest Atlantic Southern Ocean |
genre_facet |
Northwest Atlantic Southern Ocean |
op_source |
Faculty Bibliography 2010s |
op_relation |
https://stars.library.ucf.edu/facultybib2010/5141 https://stars.library.ucf.edu/cgi/viewcontent.cgi?article=6140&context=facultybib2010 |
_version_ |
1766148639658344448 |