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Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles

Holly Stokes, Kimberley Stokes, Jeanne A. Mortimer Orcid Logo, Jacques‐Olivier Laloë Orcid Logo, Nicole Esteban Orcid Logo, Graeme C. Hays Orcid Logo

Methods in Ecology and Evolution, Volume: 16, Issue: 1, Pages: 160 - 169

Swansea University Authors: Holly Stokes, Kimberley Stokes, Nicole Esteban Orcid Logo

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DOI (Published version): 10.1111/2041-210x.14464

Abstract

Animal‐borne devices including transmitters, data loggers and identification tags are widely used across taxa to address important biological and ecological questions. Some of these devices may affect fitness, hence studies to assess device impacts are important across taxa and developmental stages....

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Published in: Methods in Ecology and Evolution
ISSN: 2041-210X 2041-210X
Published: Wiley 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa68366
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spelling 2025-02-04T12:23:08.4880028 v2 68366 2024-11-28 Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles 6ee6932996059ed9e4d581641acce2f7 Holly Stokes Holly Stokes true false 9ae3c7349402163dc0fbfe2e6dcd4dae Kimberley Stokes Kimberley Stokes true false fb2e760b83b4580e7445092982f1f319 0000-0003-4693-7221 Nicole Esteban Nicole Esteban true false 2024-11-28 BGPS Animal‐borne devices including transmitters, data loggers and identification tags are widely used across taxa to address important biological and ecological questions. Some of these devices may affect fitness, hence studies to assess device impacts are important across taxa and developmental stages. We assessed the impact of satellite tagging on sea turtles at a foraging site in the Indian Ocean. Hawksbill turtles (Eretmochelys imbricata) were captured, and satellite tags (Fastloc‐GPS Argos) attached to 25 individuals between 2018 and 2021, with a mean straight carapace length (SCLn‐t) of 55.3 ± 6.9 cm (range = 47.9–69.5 cm; N = 21). We recaptured 12 tagged turtles and removed 11 tags between 2021 and 2023 and estimated growth rates of tagged (N = 10) and untagged (N = 44) animals (mean SCL range = 33.3–69.4 cm) using capture–mark–recapture of 54 individuals at liberty for 730–1095 days. Growth rates decreased exponentially as turtle size increased, and we found no significant difference between tagged and untagged growth rates and body condition. We also found no damage to the carapace from the tag attachment. We suggest that tagging does not impact growth rates at this study site because the turtles (i) typically maintain small home ranges in the lagoon and (ii) are benthic feeders, not actively pursuing prey. We encourage best practice to study the effects of satellite tagging on turtle populations around the world, as the outlook may be different for animals that swim long distances and/or carry large devices. Journal Article Methods in Ecology and Evolution 16 1 160 169 Wiley 2041-210X 2041-210X Animal welfare, conservation, critically endangered, juvenile, marine megafauna, marine 2protected area, satellite tracking, Western Indian Ocean 1 1 2025 2025-01-01 10.1111/2041-210x.14464 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University SU Library paid the OA fee (TA Institutional Deal) We are grateful to the many volunteers on Diego Garcia for their fieldwork assistance and the BIOT Administration for fieldwork and logistical support. This research was supported by the Bertarelli Foundation as part of the Bertarelli Programme in Marine Science (projects 2017-4, 820633). Our research was approved by Swansea University and Deakin University Ethics Committees and the British Indian Ocean Territory Administration (BIOTA) of the UK Foreign, Commonwealth and Development Office. The study was endorsed through research permits (0006SE18, 0009SE18, 0004SE19, 0001SE21, 0001XSE22 and 0007SE23) from the Commissioner's Representative for BIOT and research complied with all relevant local and national legislation. 2025-02-04T12:23:08.4880028 2024-11-28T11:25:24.5707849 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Holly Stokes 1 Kimberley Stokes 2 Jeanne A. Mortimer 0000-0001-6318-2890 3 Jacques‐Olivier Laloë 0000-0002-1437-1959 4 Nicole Esteban 0000-0003-4693-7221 5 Graeme C. Hays 0000-0002-3314-8189 6 68366__32987__3430cfe9ed544b33b0e02bd10a0169e0.pdf 2041-210X.14464.pdf 2024-11-28T11:25:24.5437896 Output 1541500 application/pdf Version of Record true © 2024 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License (CC BY 4.0). true eng http://creativecommons.org/licenses/by/4.0/
title Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
spellingShingle Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
Holly Stokes
Kimberley Stokes
Nicole Esteban
title_short Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
title_full Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
title_fullStr Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
title_full_unstemmed Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
title_sort Assessing the impacts of satellite tagging on growth rates of immature hawksbill turtles
author_id_str_mv 6ee6932996059ed9e4d581641acce2f7
9ae3c7349402163dc0fbfe2e6dcd4dae
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author_id_fullname_str_mv 6ee6932996059ed9e4d581641acce2f7_***_Holly Stokes
9ae3c7349402163dc0fbfe2e6dcd4dae_***_Kimberley Stokes
fb2e760b83b4580e7445092982f1f319_***_Nicole Esteban
author Holly Stokes
Kimberley Stokes
Nicole Esteban
author2 Holly Stokes
Kimberley Stokes
Jeanne A. Mortimer
Jacques‐Olivier Laloë
Nicole Esteban
Graeme C. Hays
format Journal article
container_title Methods in Ecology and Evolution
container_volume 16
container_issue 1
container_start_page 160
publishDate 2025
institution Swansea University
issn 2041-210X
2041-210X
doi_str_mv 10.1111/2041-210x.14464
publisher Wiley
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
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description Animal‐borne devices including transmitters, data loggers and identification tags are widely used across taxa to address important biological and ecological questions. Some of these devices may affect fitness, hence studies to assess device impacts are important across taxa and developmental stages. We assessed the impact of satellite tagging on sea turtles at a foraging site in the Indian Ocean. Hawksbill turtles (Eretmochelys imbricata) were captured, and satellite tags (Fastloc‐GPS Argos) attached to 25 individuals between 2018 and 2021, with a mean straight carapace length (SCLn‐t) of 55.3 ± 6.9 cm (range = 47.9–69.5 cm; N = 21). We recaptured 12 tagged turtles and removed 11 tags between 2021 and 2023 and estimated growth rates of tagged (N = 10) and untagged (N = 44) animals (mean SCL range = 33.3–69.4 cm) using capture–mark–recapture of 54 individuals at liberty for 730–1095 days. Growth rates decreased exponentially as turtle size increased, and we found no significant difference between tagged and untagged growth rates and body condition. We also found no damage to the carapace from the tag attachment. We suggest that tagging does not impact growth rates at this study site because the turtles (i) typically maintain small home ranges in the lagoon and (ii) are benthic feeders, not actively pursuing prey. We encourage best practice to study the effects of satellite tagging on turtle populations around the world, as the outlook may be different for animals that swim long distances and/or carry large devices.
published_date 2025-01-01T08:12:21Z
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