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Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles / Antoine M. Dujon; Gail Schofield; Rebecca E. Lester; Nicole Esteban; Graeme C. Hays

Marine Biology, Volume: 164, Issue: 9

Swansea University Author: Nicole, Esteban

Abstract

Determining the time of day that animals initiate and end migration, as well as variation in diel movement patterns during migration, provides insights into the types of strategy used to maximise energy efficiency and ensure successful completion of migration. However, obtaining this level of detail...

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Published in: Marine Biology
ISSN: 0025-3162 1432-1793
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa36179
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spelling 2017-12-08T12:00:31.6578663 v2 36179 2017-10-19 Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles fb2e760b83b4580e7445092982f1f319 0000-0003-4693-7221 Nicole Esteban Nicole Esteban true false 2017-10-19 SBI Determining the time of day that animals initiate and end migration, as well as variation in diel movement patterns during migration, provides insights into the types of strategy used to maximise energy efficiency and ensure successful completion of migration. However, obtaining this level of detail has been difficult for long-distance migratory marine species. Thus, we investigated whether the large volume of highly accurate locations obtained by Argos-linked Fastloc-GPS transmitters could be used to identify the time of day that adult green (n = 8 turtles, 9487 locations) and loggerhead (n = 46 turtles, 47,588 locations) sea turtles initiate and end migration, along with potential resting strategies during migration. We found that departure from and arrival at breeding, stopover and foraging sites consistently occurred during the daytime, which is consistent with previous findings suggesting that turtles might use solar visual cues for orientation. Only seven turtles made stopovers (of up to 6 days and all located close to the start or end of migration) during migration, possibly to rest and/or refuel; however, observations of day versus night speed of travel indicated that turtles might use other mechanisms to rest. For instance, turtles travelled 31% slower at night compared to day during their oceanic crossings. Furthermore, within the first 24 h of entering waters shallower than 100 m towards the end of migration, some individuals travelled 72% slower at night, repeating this behaviour intermittently (each time for a one-night duration at 3–6 day intervals) until reaching the foraging grounds. Thus, access to data-rich, highly accurate Argos-linked Fastloc-GPS provided information about differences in day versus night activity at different stages in migration, allowing us, for the first time, to compare the strategies used by a marine vertebrate with terrestrial land-based and flying species. Journal Article Marine Biology 164 9 0025-3162 1432-1793 Chagos, Chelonia, Argos, Fastloc-GPS, migration strategy, critically endangered 1 9 2017 2017-09-01 10.1007/s00227-017-3216-8 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2017-12-08T12:00:31.6578663 2017-10-19T14:55:16.7252785 College of Science Biosciences Antoine M. Dujon 1 Gail Schofield 2 Rebecca E. Lester 3 Nicole Esteban 0000-0003-4693-7221 4 Graeme C. Hays 5 0036179-08122017114824.pdf 36179.pdf 2017-12-08T11:48:24.9370000 Output 1557091 application/pdf Accepted Manuscript true 2018-08-22T00:00:00.0000000 12 month embargo. true eng
title Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
spellingShingle Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
Nicole, Esteban
title_short Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
title_full Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
title_fullStr Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
title_full_unstemmed Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
title_sort Fastloc-GPS reveals daytime departure and arrival during long-distance migration and the use of different resting strategies in sea turtles
author_id_str_mv fb2e760b83b4580e7445092982f1f319
author_id_fullname_str_mv fb2e760b83b4580e7445092982f1f319_***_Nicole, Esteban
author Nicole, Esteban
author2 Antoine M. Dujon
Gail Schofield
Rebecca E. Lester
Nicole Esteban
Graeme C. Hays
format Journal article
container_title Marine Biology
container_volume 164
container_issue 9
publishDate 2017
institution Swansea University
issn 0025-3162
1432-1793
doi_str_mv 10.1007/s00227-017-3216-8
college_str College of Science
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hierarchy_top_id collegeofscience
hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
hierarchy_parent_title College of Science
department_str Biosciences{{{_:::_}}}College of Science{{{_:::_}}}Biosciences
document_store_str 1
active_str 0
description Determining the time of day that animals initiate and end migration, as well as variation in diel movement patterns during migration, provides insights into the types of strategy used to maximise energy efficiency and ensure successful completion of migration. However, obtaining this level of detail has been difficult for long-distance migratory marine species. Thus, we investigated whether the large volume of highly accurate locations obtained by Argos-linked Fastloc-GPS transmitters could be used to identify the time of day that adult green (n = 8 turtles, 9487 locations) and loggerhead (n = 46 turtles, 47,588 locations) sea turtles initiate and end migration, along with potential resting strategies during migration. We found that departure from and arrival at breeding, stopover and foraging sites consistently occurred during the daytime, which is consistent with previous findings suggesting that turtles might use solar visual cues for orientation. Only seven turtles made stopovers (of up to 6 days and all located close to the start or end of migration) during migration, possibly to rest and/or refuel; however, observations of day versus night speed of travel indicated that turtles might use other mechanisms to rest. For instance, turtles travelled 31% slower at night compared to day during their oceanic crossings. Furthermore, within the first 24 h of entering waters shallower than 100 m towards the end of migration, some individuals travelled 72% slower at night, repeating this behaviour intermittently (each time for a one-night duration at 3–6 day intervals) until reaching the foraging grounds. Thus, access to data-rich, highly accurate Argos-linked Fastloc-GPS provided information about differences in day versus night activity at different stages in migration, allowing us, for the first time, to compare the strategies used by a marine vertebrate with terrestrial land-based and flying species.
published_date 2017-09-01T03:55:27Z
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