Brown, J.M.

English

Migration is a life-history strategy used by diverse animal taxa to exploit seasonal changes in environmental conditions. Animals are expected to benefit from migrating as a result of having access to more stable food and weather throughout the year, though this may come at the cost of increased energy expenditure and risk during the migratory journey. Assumptions regarding the costs, benefits and challenges of migrating have rarely been empirically evaluated. In this thesis, I use the diverse migration strategies of lesser black-backed gulls as a natural experiment to quantify how migrating to different nonbreeding regions influences behavioural flexibility, time and energy allocation throughout the year, survival probability and reproduction. We additionally validate the use of dynamic body acceleration as a proxy for measuring energy expenditure in this species, which moves using a range of different locomotory modes (flapping, soaring, walking). Contrary to expectations, migration strategy had little influence on variation in migratory behaviours, energy requirements, activity patterns, survival probability or early-stage reproductive parameters. Instead, we found high variation in these traits among individuals using similar migration strategies. This suggests that individual differences in behaviour at finer spatio-temporal scales (e.g. foraging strategy) may be more influential for determining behaviour and energy expenditure, and by extension, fitness, than migration distance. Given the numerous ecological currencies influence by migration strategy, and the scale on which individuals can adjust their behaviour, we conclude that existence of multiple successful migration strategies is likely to be the norm for migratory species

International Migration, Integration and Social Cohesion online publications

UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)Gull over-travels?Consequences of diverse migration strategies in a generalist seabirdBrown, J.M.Publication date2022Link to publicationCitation for published version (APA):Brown, J. M. (2022). Gull over-travels? Consequences of diverse migration strategies in ageneralist seabird. [Thesis, fully internal, Universiteit van Amsterdam].General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s)and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an opencontent license (like Creative Commons).Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, pleaselet the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the materialinaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letterto: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. Youwill be contacted as soon as possible.Download date:31 Aug 2023Morgan BrownGull over-travels?Consequences of diverse migration strategies in a generalist seabird© 2022  Brown, J. MGull over-travels? Consequences of diverse migration strategies in a generalist seabird.PhD thesis, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The NetherlandsThis thesis was supported by a Alexander Graham Bell Canada Graduate Scholarship awarded to Morgan Brown by the Natural Sciences and Engineering Research Council of Canada (PGSD3-503551-2017). A grant from the Ecology Fund awarded to Morgan Brown by the Royal Netherlands Academy of Arts and Sciences was used to purchase heart rate loggers (KNAWWF/807/19004).All data and scripts used to produce results in this these are archived in the IBED Institutional Data Repository on research drive according to the IBED Research Data Archiving Requirements (V1).ISBN: 978-94-93260-07-8Illustrations: Morgan Brown Lay-out: Esther Beekman (www.estherontwerpt.nl)Printed: Ipskamp printingGull over-travels?Consequences of diverse migration strategiesin a generalist seabirdACADEMISCH PROEFSCHRIFTter verkrijging van de graad van doctoraan de Universiteit van Amsterdamop gezag van de Rector Magnificusprof. dr. ir. K.I.J. Maexten overstaan van een door het College voor Promoties ingestelde commissie, in het openbaar te verdedigen in de Agnietenkapelop dinsdag 5 april 2022, te 15.00 uurdoor Jennifer Morgan Browngeboren te MiltonPromotiecommissiePromotores:  prof. dr. J.Z. Shamoun-Baranes Universiteit van Amsterdamprof. dr. ir. W. Bouten Universiteit van AmsterdamOverige leden: prof. dr. A.M. de Roos Universiteit van Amsterdamprof. dr. B.A. Nolet Universiteit van Amsterdamdr. I.M. Smallegange Universiteit van Amsterdamdr. ir. E.E. van Loon  Universiteit van Amsterdamprof. dr. T. Piersma Rijksuniversiteit Groningendr. K.H. Elliott McGill Universitydr. S.C. Patrick  University of LiverpoolFaculteit der Natuurwetenschappen, Wiskunde en InformaticaContents91736476889113119136139154182184186190196Chapter 1.  General IntroductionChapter 2.   Long-distance migrants vary migratory behaviour as much as  short-distance migrants: an individual-level comparison from  a seabird species with diverse migration strategies    Supplementary Materials for Chapter 2Chapter 3.   Acceleration as a proxy for energy expenditure in a facultative- soaring bird: comparing dynamic body acceleration and  time-energy budgets to heart rate    Supplementary Materials for Chapter 3Chapter 4.   Migrating further does not affect annual energy expenditure  but increases variation in daily energy expenditure in lesser  black-backed gulls    Supplementary Materials for Chapter 4Chapter 5.   Equal survival and reproductive parameters between short-  and long-distance migrating lesser black-backed gulls    Supplementary Materials for Chapter 5Chapter 6.   Consequences of diverse migration strategies: A synthesisReferencesAuthor ContributionsAuthor Affiliations SummarySamenvattingAknowledgements

Gull over-travels?:Consequences of diverse migration strategies in a generalist seabird

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Gull over-travels?:Consequences of diverse migration strategies in a generalist seabird

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International Migration, Integration and Social Cohesion online publications