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Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking

Fredrik Christiansen, Nicole Esteban Orcid Logo, Jeanne A. Mortimer, Antoine M. Dujon, Graeme C. Hays

Marine Biology, Volume: 164, Issue: 1

Swansea University Author: Nicole Esteban Orcid Logo

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DOI (Published version): 10.1007/s00227-016-3048-y

Abstract

An animal’s home range is driven by a range of factors including top-down (predation risk) and bottom-up (habitat quality) processes, which often vary in both space and time. We assessed the role of these processes in driving spatiotemporal patterns in the home range of the green turtle (Chelonia my...

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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/cronfa31488
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spelling 2019-07-17T17:47:50.6910875 v2 31488 2016-12-14 Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking fb2e760b83b4580e7445092982f1f319 0000-0003-4693-7221 Nicole Esteban Nicole Esteban true false 2016-12-14 SBI An animal’s home range is driven by a range of factors including top-down (predation risk) and bottom-up (habitat quality) processes, which often vary in both space and time. We assessed the role of these processes in driving spatiotemporal patterns in the home range of the green turtle (Chelonia mydas), an important marine megaherbivore. We satellite tracked adult green turtles using Fastloc-GPS telemetry in the Chagos Archipelago and tracked their fine-scale movement in different foraging areas in the Indian Ocean. Using this extensive data set (5,081 locations over 1,675 tracking days for 8 individuals) we showed that green turtles exhibit both diel and seasonal patterns in activity and home range size. At night, turtles had smaller home ranges and lower activity levels, suggesting they were resting. In the daytime, home ranges were larger and activity levels higher, indicating that turtles were actively feeding. The transit distance between diurnal and nocturnal sites varied considerably between individuals. Further, some turtles changed resting and foraging sites seasonally. These structured movements indicate that turtles had a good understanding of their foraging grounds in regards to suitable areas for foraging and sheltered areas for resting. The clear diel patterns and the restricted size of nocturnal sites could be caused by spatiotemporal variations in predation risk, although other factors (e.g. depth, tides and currents) could also be important. The diurnal and seasonal pattern in home range sizes could similarly be driven by spatiotemporal variations in habitat (e.g. seagrass or algae) quality, although this could not be confirmed. Journal Article Marine Biology 164 1 0025-3162 1432-1793 activity patterns; bottom-up effects; home range; spatial ecology; top-down effects 31 12 2017 2017-12-31 10.1007/s00227-016-3048-y COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2019-07-17T17:47:50.6910875 2016-12-14T15:18:26.4943559 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Fredrik Christiansen 1 Nicole Esteban 0000-0003-4693-7221 2 Jeanne A. Mortimer 3 Antoine M. Dujon 4 Graeme C. Hays 5 0031488-06012017111035.pdf Accepted_Manuscript_Christiansen_etal_MarBio_2017.pdf 2017-01-06T11:10:35.1700000 Output 992160 application/pdf Accepted Manuscript true 2017-11-29T00:00:00.0000000 true 0031488-02052019142548.pdf AcceptedManuscript_Christiansen_etal_MarBio_2017.pdf 2019-05-02T14:25:48.7170000 Output 992160 application/pdf Accepted Manuscript true 2019-05-02T00:00:00.0000000 true eng
title Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
spellingShingle Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
Nicole Esteban
title_short Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
title_full Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
title_fullStr Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
title_full_unstemmed Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
title_sort Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking
author_id_str_mv fb2e760b83b4580e7445092982f1f319
author_id_fullname_str_mv fb2e760b83b4580e7445092982f1f319_***_Nicole Esteban
author Nicole Esteban
author2 Fredrik Christiansen
Nicole Esteban
Jeanne A. Mortimer
Antoine M. Dujon
Graeme C. Hays
format Journal article
container_title Marine Biology
container_volume 164
container_issue 1
publishDate 2017
institution Swansea University
issn 0025-3162
1432-1793
doi_str_mv 10.1007/s00227-016-3048-y
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
document_store_str 1
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description An animal’s home range is driven by a range of factors including top-down (predation risk) and bottom-up (habitat quality) processes, which often vary in both space and time. We assessed the role of these processes in driving spatiotemporal patterns in the home range of the green turtle (Chelonia mydas), an important marine megaherbivore. We satellite tracked adult green turtles using Fastloc-GPS telemetry in the Chagos Archipelago and tracked their fine-scale movement in different foraging areas in the Indian Ocean. Using this extensive data set (5,081 locations over 1,675 tracking days for 8 individuals) we showed that green turtles exhibit both diel and seasonal patterns in activity and home range size. At night, turtles had smaller home ranges and lower activity levels, suggesting they were resting. In the daytime, home ranges were larger and activity levels higher, indicating that turtles were actively feeding. The transit distance between diurnal and nocturnal sites varied considerably between individuals. Further, some turtles changed resting and foraging sites seasonally. These structured movements indicate that turtles had a good understanding of their foraging grounds in regards to suitable areas for foraging and sheltered areas for resting. The clear diel patterns and the restricted size of nocturnal sites could be caused by spatiotemporal variations in predation risk, although other factors (e.g. depth, tides and currents) could also be important. The diurnal and seasonal pattern in home range sizes could similarly be driven by spatiotemporal variations in habitat (e.g. seagrass or algae) quality, although this could not be confirmed.
published_date 2017-12-31T03:38:29Z
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