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Foraging behaviour of the greater noctule bat / ELLIOT DEE

Swansea University Author: ELLIOT DEE

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Abstract

Knowledge of foraging costs is important to understanding the drivers of animal movement, and canaid prediction of the energetic implications of environmental perturbation. Here, we characterisethe feeding behaviour of greater noctule bats (Nyctalus lasiopterus) at the level of individual feedingeve...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Master of Research
Degree name: MRes
Supervisor: Wilson, R., P.; and Lurgi, M.
URI: https://cronfa.swan.ac.uk/Record/cronfa66613
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spelling v2 66613 2024-06-07 Foraging behaviour of the greater noctule bat 6c7f4542813e82ff3c2218f1020b4b65 ELLIOT DEE ELLIOT DEE true false 2024-06-07 Knowledge of foraging costs is important to understanding the drivers of animal movement, and canaid prediction of the energetic implications of environmental perturbation. Here, we characterisethe feeding behaviour of greater noctule bats (Nyctalus lasiopterus) at the level of individual feedingevents, with the aims of: (1) quantifying behavioural signatures corresponding with feeding; and, (2)examining differences in feeding attributable to prey type. Behavioural data were obtained fromnoctules equipped with accelerometers in Donaña National Park, Spain, along with faecal datacollected from roosts. Stereotyped postures and movements indicating feeding were identifiedvisually, using which thresholds in four metrics were selected for use in Boolean classificationalgorithms delineating individual feeds. The dimensionality of feed accelerometer metrics wasreduced using Principal Component Analysis (PCA), and the metrics best characterising feedingretrieved using variable loadings. We calculated Intraclass Correlation Coefficients (ICCs) at theindividual and roost levels to test for within-group correlation in feeding behaviour. Finally, binomialGLMs were fitted to predict the effect of PC1 on the frequency of occurrence (FO) of seven prey taxain faeces. We identified 422 feeds, comprising significant departures in static and dynamicacceleration from normal flight. PCA loadings indicated six metrics characterising feeds, none ofwhich showed evidence of clustering attributable to prey type. ICCs indicated individual- but notroost-level correlation in PC1, suggesting individual differences independent of proximity to preyfields. Additionally, GLMs yielded no evidence that FO varies with PC1. For the first time, wequantify feeding behaviour in N. lasiopterus - a threatened insectivorous bat - using accelerometers,with implications for reconstructing energy budgets across larger-scale movement trajectories.Disentangling the drivers of individual differences may be important to understanding demographicinfluences on bat foraging ecology. However, future studies linking diet and feeding behaviourwould benefit from more refined behavioural algorithms E-Thesis Swansea University, Wales, UK Accelerometery, bat, foraging 20 3 2024 2024-03-20 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 Wilson, R., P.; and Lurgi, M. Master of Research MRes 2024-06-07T16:24:14.9915020 2024-06-07T16:14:42.8905201 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences ELLIOT DEE 1 66613__30579__b6e5318c7d134f388eb87fefbed71c27.pdf 2024_Dee_E.final.66613.pdf 2024-06-07T16:23:30.2339315 Output 2237978 application/pdf E-Thesis – open access true Copyright, The Author, Elliott William Dee, 2024 true eng
title Foraging behaviour of the greater noctule bat
spellingShingle Foraging behaviour of the greater noctule bat
ELLIOT DEE
title_short Foraging behaviour of the greater noctule bat
title_full Foraging behaviour of the greater noctule bat
title_fullStr Foraging behaviour of the greater noctule bat
title_full_unstemmed Foraging behaviour of the greater noctule bat
title_sort Foraging behaviour of the greater noctule bat
author_id_str_mv 6c7f4542813e82ff3c2218f1020b4b65
author_id_fullname_str_mv 6c7f4542813e82ff3c2218f1020b4b65_***_ELLIOT DEE
author ELLIOT DEE
author2 ELLIOT DEE
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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
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description Knowledge of foraging costs is important to understanding the drivers of animal movement, and canaid prediction of the energetic implications of environmental perturbation. Here, we characterisethe feeding behaviour of greater noctule bats (Nyctalus lasiopterus) at the level of individual feedingevents, with the aims of: (1) quantifying behavioural signatures corresponding with feeding; and, (2)examining differences in feeding attributable to prey type. Behavioural data were obtained fromnoctules equipped with accelerometers in Donaña National Park, Spain, along with faecal datacollected from roosts. Stereotyped postures and movements indicating feeding were identifiedvisually, using which thresholds in four metrics were selected for use in Boolean classificationalgorithms delineating individual feeds. The dimensionality of feed accelerometer metrics wasreduced using Principal Component Analysis (PCA), and the metrics best characterising feedingretrieved using variable loadings. We calculated Intraclass Correlation Coefficients (ICCs) at theindividual and roost levels to test for within-group correlation in feeding behaviour. Finally, binomialGLMs were fitted to predict the effect of PC1 on the frequency of occurrence (FO) of seven prey taxain faeces. We identified 422 feeds, comprising significant departures in static and dynamicacceleration from normal flight. PCA loadings indicated six metrics characterising feeds, none ofwhich showed evidence of clustering attributable to prey type. ICCs indicated individual- but notroost-level correlation in PC1, suggesting individual differences independent of proximity to preyfields. Additionally, GLMs yielded no evidence that FO varies with PC1. For the first time, wequantify feeding behaviour in N. lasiopterus - a threatened insectivorous bat - using accelerometers,with implications for reconstructing energy budgets across larger-scale movement trajectories.Disentangling the drivers of individual differences may be important to understanding demographicinfluences on bat foraging ecology. However, future studies linking diet and feeding behaviourwould benefit from more refined behavioural algorithms
published_date 2024-03-20T16:25:10Z
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score 11.036706

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