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What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks? / ABIGAIL BUXTON

Swansea University Author: ABIGAIL BUXTON

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Abstract

During oscillatory dives, whale sharks (Rhincodon typus) expend varying levels of energy in active ascent and passive descent. They are expected to minimise movement costs by travelling at optimum speed unless having reason to move faster, for example during feeding or evasion of danger. A proxy for...

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Published: Swansea 2023
Institution: Swansea University
Degree level: Master of Research
Degree name: MRes
Supervisor: Rose. Kayleigh A. R. ; Wilson, Rory P.
URI: https://cronfa.swan.ac.uk/Record/cronfa62401
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first_indexed 2023-01-23T11:35:46Z
last_indexed 2023-01-24T04:19:25Z
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spelling 2023-01-23T11:43:15.9210989 v2 62401 2023-01-23 What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks? 5e0569814e28fd1a6ce9b872c7a66483 ABIGAIL BUXTON ABIGAIL BUXTON true false 2023-01-23 During oscillatory dives, whale sharks (Rhincodon typus) expend varying levels of energy in active ascent and passive descent. They are expected to minimise movement costs by travelling at optimum speed unless having reason to move faster, for example during feeding or evasion of danger. A proxy for power, dynamic body acceleration (DBA) has previously been used to identify whale shark movement patterns but has yet been used to identify occasions where power is elevated above minimum requirements. 59 hours of biologging data from 13 juvenile whale sharks (Ningaloo Reef, Western Australia) including depth, body pitch angle, magnetometry and DBA, was analysed to investigate minimum power requirements for dives and identify events of elevated power. Dynamic yaw (the rate of change of heading), a new proxy for power, was introduced to determine its effectiveness compared to the already-established DBA. The relationship between pitch angle and these two proxies was investigated to determine which had the stronger relationship. Dynamic yaw produced a poor relationship with pitch angle compared to DBA, and thus DBA was selected as the focus proxy for the remainder of the study. DBA was utilised to produce a minimum power trend versus body pitch angle using a convex hull analysis which allowed for the identification of proxy for power utilisation above the minimum (PAM). 16 instances of PAM were identified in 59 hours of data, which could all be considered instances where energy minimisation is not prioritised, such as feeding or avoidance. The PAM method was capable of identifying instances where energy minimisation is not prioritised, and therefore has future implications in investigations of location-specific behaviours in relation to feeding and anthropogenic disturbance. E-Thesis Swansea energetics, whale sharks, DBA, PPAM, power proxy 13 1 2023 2023-01-13 COLLEGE NANME COLLEGE CODE Swansea University Rose. Kayleigh A. R. ; Wilson, Rory P. Master of Research MRes 2023-01-23T11:43:15.9210989 2023-01-23T11:32:56.4149999 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences ABIGAIL BUXTON 1 62401__26363__f154a7c3cf374f1fa2cc8cda4f577203.pdf Buxton_Abigail_MRes_Thesis_Final_Redacted_Signature.pdf 2023-01-23T11:43:00.1144433 Output 1579074 application/pdf E-Thesis – open access true Copyright: The author, Abigail L. Buxton, 2023. true eng
title What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
spellingShingle What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
ABIGAIL BUXTON
title_short What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
title_full What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
title_fullStr What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
title_full_unstemmed What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
title_sort What do new performance metrics, VeDBA and Dynamic yaw, tell us about energy-intensive activities in whale sharks?
author_id_str_mv 5e0569814e28fd1a6ce9b872c7a66483
author_id_fullname_str_mv 5e0569814e28fd1a6ce9b872c7a66483_***_ABIGAIL BUXTON
author ABIGAIL BUXTON
author2 ABIGAIL BUXTON
format E-Thesis
publishDate 2023
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
active_str 0
description During oscillatory dives, whale sharks (Rhincodon typus) expend varying levels of energy in active ascent and passive descent. They are expected to minimise movement costs by travelling at optimum speed unless having reason to move faster, for example during feeding or evasion of danger. A proxy for power, dynamic body acceleration (DBA) has previously been used to identify whale shark movement patterns but has yet been used to identify occasions where power is elevated above minimum requirements. 59 hours of biologging data from 13 juvenile whale sharks (Ningaloo Reef, Western Australia) including depth, body pitch angle, magnetometry and DBA, was analysed to investigate minimum power requirements for dives and identify events of elevated power. Dynamic yaw (the rate of change of heading), a new proxy for power, was introduced to determine its effectiveness compared to the already-established DBA. The relationship between pitch angle and these two proxies was investigated to determine which had the stronger relationship. Dynamic yaw produced a poor relationship with pitch angle compared to DBA, and thus DBA was selected as the focus proxy for the remainder of the study. DBA was utilised to produce a minimum power trend versus body pitch angle using a convex hull analysis which allowed for the identification of proxy for power utilisation above the minimum (PAM). 16 instances of PAM were identified in 59 hours of data, which could all be considered instances where energy minimisation is not prioritised, such as feeding or avoidance. The PAM method was capable of identifying instances where energy minimisation is not prioritised, and therefore has future implications in investigations of location-specific behaviours in relation to feeding and anthropogenic disturbance.
published_date 2023-01-13T04:21:59Z
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score 11.016235

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