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Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures / FREDERICK BAGGS

Swansea University Author: FREDERICK BAGGS

Abstract

Climate change-induced rises in incubation temperatures pose a threat to sea turtle reproductive success, resulting in increased embryonic mortality, skewed sex ratios, and modified hatchling phenotypes. This study evaluated the effects of three irrigation regimes (single large event, intermittent,...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Master of Research
Degree name: MRes
Supervisor: Esteban, N., & Stokes, K.
URI: https://cronfa.swan.ac.uk/Record/cronfa66891
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first_indexed 2024-06-25T13:33:06Z
last_indexed 2024-06-25T13:33:06Z
id cronfa66891
recordtype RisThesis
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spelling v2 66891 2024-06-25 Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures 96bc3db5d0fd206f8b45c34c75707679 FREDERICK BAGGS FREDERICK BAGGS true false 2024-06-25 Climate change-induced rises in incubation temperatures pose a threat to sea turtle reproductive success, resulting in increased embryonic mortality, skewed sex ratios, and modified hatchling phenotypes. This study evaluated the effects of three irrigation regimes (single large event, intermittent, daily) on sand temperatures at nest depths under controlled conditions and at a rookery in Southern Turkey. In controlled settings, daily irrigation decreased mean nest temperatures by up to 1.21°C compared to controls but increased diel variation by 0.84 ± 0.05 °C SE. Single applications elevated temperatures by up to 0.75°C. In the field trial, seawater irrigation led to elevated salinityat nest depth, potentially reaching lethal thresholds (16.28 ppt at 35 cm depth). Field trials conducted in extreme heat conditions (max 52.95°C) validated the effectiveness of daily irrigation, resulting in mean temperature reductions of up to 0.8°C. In extreme heat environments, sufficiently reducing temperatures to influence sex ratios is unlikely to be achievable – instead, the aim should focus on providing enough cooling to mitigate embryonic mortality. E-Thesis Swansea University, Wales, UK Artificial irrigation, embryonic development, Temperature-dependent sex determination, climate change, sea turtle conservation. 6 6 2024 2024-06-06 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Esteban, N., & Stokes, K. Master of Research MRes 2024-06-25T14:35:27.5152639 2024-06-25T14:27:03.2269561 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences FREDERICK BAGGS 1 66891__30744__9692428463694137b42c49b75bdc206e.pdf 2024_Baggs_F.final.66891.pdf 2024-06-25T14:32:17.6104178 Output 1911929 application/pdf E-Thesis – open access true Copyright: The Author, Fred Baggs, 2024 true eng
title Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
spellingShingle Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
FREDERICK BAGGS
title_short Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
title_full Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
title_fullStr Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
title_full_unstemmed Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
title_sort Controlled trials of artificial irrigation methods to combat high sea turtle nest temperatures
author_id_str_mv 96bc3db5d0fd206f8b45c34c75707679
author_id_fullname_str_mv 96bc3db5d0fd206f8b45c34c75707679_***_FREDERICK BAGGS
author FREDERICK BAGGS
author2 FREDERICK BAGGS
format E-Thesis
publishDate 2024
institution Swansea University
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 Climate change-induced rises in incubation temperatures pose a threat to sea turtle reproductive success, resulting in increased embryonic mortality, skewed sex ratios, and modified hatchling phenotypes. This study evaluated the effects of three irrigation regimes (single large event, intermittent, daily) on sand temperatures at nest depths under controlled conditions and at a rookery in Southern Turkey. In controlled settings, daily irrigation decreased mean nest temperatures by up to 1.21°C compared to controls but increased diel variation by 0.84 ± 0.05 °C SE. Single applications elevated temperatures by up to 0.75°C. In the field trial, seawater irrigation led to elevated salinityat nest depth, potentially reaching lethal thresholds (16.28 ppt at 35 cm depth). Field trials conducted in extreme heat conditions (max 52.95°C) validated the effectiveness of daily irrigation, resulting in mean temperature reductions of up to 0.8°C. In extreme heat environments, sufficiently reducing temperatures to influence sex ratios is unlikely to be achievable – instead, the aim should focus on providing enough cooling to mitigate embryonic mortality.
published_date 2024-06-06T14:35:26Z
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score 11.012678

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