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Individual variation in home‐range across an ocean basin and links to habitat quality and management

Graeme C. Hays Orcid Logo, Alex Rattray Orcid Logo, Takahiro Shimada Orcid Logo, Nicole Esteban Orcid Logo

Journal of Applied Ecology, Volume: 61, Issue: 4, Pages: 658 - 668

Swansea University Author: Nicole Esteban Orcid Logo

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DOI (Published version): 10.1111/1365-2664.14599

Abstract

Overgrazing may lead to management intervention (e.g. culling, animal relocation) to try and prevent habitat destruction. Overgrazing leading to seagrass meadow collapse has been recorded for green turtles (Chelonia mydas) at several sites around the world, although the generality of this phenomenon...

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Published in: Journal of Applied Ecology
ISSN: 0021-8901 1365-2664
Published: Wiley 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa65751
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Overgrazing leading to seagrass meadow collapse has been recorded for green turtles (Chelonia mydas) at several sites around the world, although the generality of this phenomenon and the need for intervention to prevent widespread seagrass destruction is unknown.Where turtles have degraded seagrass meadows, home-ranges are expected to be large and turtles will relocate as meadows are destroyed. We used high resolution Fastloc GPS tracking (n = 32 individuals, mean = 171 days per individual, SD = 99) to record the home-range of adult green turtles at foraging sites spanning 4523 km of longitude across the Western Indian Ocean. Contrary to predictions if overgrazing was occurring, we recorded small home-ranges and turtles rarely relocated their daytime foraging areas.Based on all locations received, the mean 50% and 95% utilisation distributions (UD50 and UD95) were 2.4 km2 (SD = 2.7) and 15.4 km2 (SD = 17.7). Space use was often particularly small at night, when turtles rest, averaging 11% of the overall space use with the mean night-time UD50 and UD95 being 0.15 km2 (SD = 0.1) and 1.1 km2 (SD = 0.8), respectively. Variation in home-range across individuals was not influenced by the data volume (number of locations per day, duration of tracking) or animal size (carapace length) but increased significantly as the distance between the centre of day and night areas increased, that is individuals that had a larger daily commute had the larger home-ranges.Synthesis and applications. Comparisons with home-range estimates from 16 previous studies, showed that those we recorded are among the smallest for adult green turtles globally. These results suggest that despite population size increases at several major nesting sites in the Western Indian Ocean, green turtles are generally not destroying the seagrass meadows on which they forage and so management intervention to prevent overgrazing is not needed. In this way, our work illustrates how movement data may inform management decisions for green turtles. 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spelling v2 65751 2024-03-05 Individual variation in home‐range across an ocean basin and links to habitat quality and management fb2e760b83b4580e7445092982f1f319 0000-0003-4693-7221 Nicole Esteban Nicole Esteban true false 2024-03-05 SBI Overgrazing may lead to management intervention (e.g. culling, animal relocation) to try and prevent habitat destruction. Overgrazing leading to seagrass meadow collapse has been recorded for green turtles (Chelonia mydas) at several sites around the world, although the generality of this phenomenon and the need for intervention to prevent widespread seagrass destruction is unknown.Where turtles have degraded seagrass meadows, home-ranges are expected to be large and turtles will relocate as meadows are destroyed. We used high resolution Fastloc GPS tracking (n = 32 individuals, mean = 171 days per individual, SD = 99) to record the home-range of adult green turtles at foraging sites spanning 4523 km of longitude across the Western Indian Ocean. Contrary to predictions if overgrazing was occurring, we recorded small home-ranges and turtles rarely relocated their daytime foraging areas.Based on all locations received, the mean 50% and 95% utilisation distributions (UD50 and UD95) were 2.4 km2 (SD = 2.7) and 15.4 km2 (SD = 17.7). Space use was often particularly small at night, when turtles rest, averaging 11% of the overall space use with the mean night-time UD50 and UD95 being 0.15 km2 (SD = 0.1) and 1.1 km2 (SD = 0.8), respectively. Variation in home-range across individuals was not influenced by the data volume (number of locations per day, duration of tracking) or animal size (carapace length) but increased significantly as the distance between the centre of day and night areas increased, that is individuals that had a larger daily commute had the larger home-ranges.Synthesis and applications. Comparisons with home-range estimates from 16 previous studies, showed that those we recorded are among the smallest for adult green turtles globally. These results suggest that despite population size increases at several major nesting sites in the Western Indian Ocean, green turtles are generally not destroying the seagrass meadows on which they forage and so management intervention to prevent overgrazing is not needed. In this way, our work illustrates how movement data may inform management decisions for green turtles. Further targeted work on the seagrass ecosystem health could help confirm this suggestion. Journal Article Journal of Applied Ecology 61 4 658 668 Wiley 0021-8901 1365-2664 biologging, Chagos, home-range, marine protected area, MPA, overgrazing, space use 1 4 2024 2024-04-01 10.1111/1365-2664.14599 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University Another institution paid the OA fee Fondation Bertarelli. Grant Numbers: BPMS-2017-4, 820633 Open access publishing facilitated by Deakin University, as part of the Wiley - Deakin University agreement via the Council of Australian University Librarians. 2024-04-25T17:26:04.5569415 2024-03-05T21:51:25.2088414 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Graeme C. Hays 0000-0002-3314-8189 1 Alex Rattray 0000-0002-8591-6688 2 Takahiro Shimada 0000-0002-3364-5169 3 Nicole Esteban 0000-0003-4693-7221 4 65751__29646__f3e53313baea4b91b587a88df0833167.pdf Hays_Rattray_Shimada_Esteban_2024_AppliedEcol_Homerange_variation_green-turtles_seagrass-quality.pdf 2024-03-05T21:52:17.6109325 Output 1665126 application/pdf Version of Record true © 2024 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License. true eng https://creativecommons.org/licenses/by/4.0/
title Individual variation in home‐range across an ocean basin and links to habitat quality and management
spellingShingle Individual variation in home‐range across an ocean basin and links to habitat quality and management
Nicole Esteban
title_short Individual variation in home‐range across an ocean basin and links to habitat quality and management
title_full Individual variation in home‐range across an ocean basin and links to habitat quality and management
title_fullStr Individual variation in home‐range across an ocean basin and links to habitat quality and management
title_full_unstemmed Individual variation in home‐range across an ocean basin and links to habitat quality and management
title_sort Individual variation in home‐range across an ocean basin and links to habitat quality and management
author_id_str_mv fb2e760b83b4580e7445092982f1f319
author_id_fullname_str_mv fb2e760b83b4580e7445092982f1f319_***_Nicole Esteban
author Nicole Esteban
author2 Graeme C. Hays
Alex Rattray
Takahiro Shimada
Nicole Esteban
format Journal article
container_title Journal of Applied Ecology
container_volume 61
container_issue 4
container_start_page 658
publishDate 2024
institution Swansea University
issn 0021-8901
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doi_str_mv 10.1111/1365-2664.14599
publisher Wiley
college_str Faculty of Science and Engineering
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description Overgrazing may lead to management intervention (e.g. culling, animal relocation) to try and prevent habitat destruction. Overgrazing leading to seagrass meadow collapse has been recorded for green turtles (Chelonia mydas) at several sites around the world, although the generality of this phenomenon and the need for intervention to prevent widespread seagrass destruction is unknown.Where turtles have degraded seagrass meadows, home-ranges are expected to be large and turtles will relocate as meadows are destroyed. We used high resolution Fastloc GPS tracking (n = 32 individuals, mean = 171 days per individual, SD = 99) to record the home-range of adult green turtles at foraging sites spanning 4523 km of longitude across the Western Indian Ocean. Contrary to predictions if overgrazing was occurring, we recorded small home-ranges and turtles rarely relocated their daytime foraging areas.Based on all locations received, the mean 50% and 95% utilisation distributions (UD50 and UD95) were 2.4 km2 (SD = 2.7) and 15.4 km2 (SD = 17.7). Space use was often particularly small at night, when turtles rest, averaging 11% of the overall space use with the mean night-time UD50 and UD95 being 0.15 km2 (SD = 0.1) and 1.1 km2 (SD = 0.8), respectively. Variation in home-range across individuals was not influenced by the data volume (number of locations per day, duration of tracking) or animal size (carapace length) but increased significantly as the distance between the centre of day and night areas increased, that is individuals that had a larger daily commute had the larger home-ranges.Synthesis and applications. Comparisons with home-range estimates from 16 previous studies, showed that those we recorded are among the smallest for adult green turtles globally. These results suggest that despite population size increases at several major nesting sites in the Western Indian Ocean, green turtles are generally not destroying the seagrass meadows on which they forage and so management intervention to prevent overgrazing is not needed. In this way, our work illustrates how movement data may inform management decisions for green turtles. Further targeted work on the seagrass ecosystem health could help confirm this suggestion.
published_date 2024-04-01T17:26:03Z
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