Drivers and constraints on offshore foraging in harbour seals

Abstract Central place foragers are expected to offset travel costs between a central place and foraging areas by targeting productive feeding zones. Harbour seals (Phoca vitulina) make multi-day foraging trips away from coastal haul-out sites presumably to target rich food resources, but periodic t...

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Autores principales:	H. M. Vance, S. K. Hooker, L. Mikkelsen, A. van Neer, J. Teilmann, U. Siebert, M. Johnson
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/282b5dda9afd4013b5c2c8e9a2f5c05c
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spelling	oai:doaj.org-article:282b5dda9afd4013b5c2c8e9a2f5c05c2021-12-02T16:35:56ZDrivers and constraints on offshore foraging in harbour seals10.1038/s41598-021-85376-22045-2322https://doaj.org/article/282b5dda9afd4013b5c2c8e9a2f5c05c2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85376-2https://doaj.org/toc/2045-2322Abstract Central place foragers are expected to offset travel costs between a central place and foraging areas by targeting productive feeding zones. Harbour seals (Phoca vitulina) make multi-day foraging trips away from coastal haul-out sites presumably to target rich food resources, but periodic track points from telemetry tags may be insufficient to infer reliably where, and how often, foraging takes place. To study foraging behaviour during offshore trips, and assess what factors limit trip duration, we equipped harbour seals in the German Wadden Sea with high-resolution multi-sensor bio-logging tags, recording 12 offshore trips from 8 seals. Using acceleration transients as a proxy for prey capture attempts, we found that foraging rates during travel to and from offshore sites were comparable to offshore rates. Offshore foraging trips may, therefore, reflect avoidance of intra-specific competition rather than presence of offshore foraging hotspots. Time spent resting increased by approx. 37 min/day during trips suggesting that a resting deficit rather than patch depletion may influence trip length. Foraging rates were only weakly correlated with surface movement patterns highlighting the value of integrating multi-sensor data from on-animal bio-logging tags (GPS, depth, accelerometers and magnetometers) to infer behaviour and habitat use.H. M. VanceS. K. HookerL. MikkelsenA. van NeerJ. TeilmannU. SiebertM. JohnsonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q H. M. Vance S. K. Hooker L. Mikkelsen A. van Neer J. Teilmann U. Siebert M. Johnson Drivers and constraints on offshore foraging in harbour seals
description	Abstract Central place foragers are expected to offset travel costs between a central place and foraging areas by targeting productive feeding zones. Harbour seals (Phoca vitulina) make multi-day foraging trips away from coastal haul-out sites presumably to target rich food resources, but periodic track points from telemetry tags may be insufficient to infer reliably where, and how often, foraging takes place. To study foraging behaviour during offshore trips, and assess what factors limit trip duration, we equipped harbour seals in the German Wadden Sea with high-resolution multi-sensor bio-logging tags, recording 12 offshore trips from 8 seals. Using acceleration transients as a proxy for prey capture attempts, we found that foraging rates during travel to and from offshore sites were comparable to offshore rates. Offshore foraging trips may, therefore, reflect avoidance of intra-specific competition rather than presence of offshore foraging hotspots. Time spent resting increased by approx. 37 min/day during trips suggesting that a resting deficit rather than patch depletion may influence trip length. Foraging rates were only weakly correlated with surface movement patterns highlighting the value of integrating multi-sensor data from on-animal bio-logging tags (GPS, depth, accelerometers and magnetometers) to infer behaviour and habitat use.
format	article
author	H. M. Vance S. K. Hooker L. Mikkelsen A. van Neer J. Teilmann U. Siebert M. Johnson
author_facet	H. M. Vance S. K. Hooker L. Mikkelsen A. van Neer J. Teilmann U. Siebert M. Johnson
author_sort	H. M. Vance
title	Drivers and constraints on offshore foraging in harbour seals
title_short	Drivers and constraints on offshore foraging in harbour seals
title_full	Drivers and constraints on offshore foraging in harbour seals
title_fullStr	Drivers and constraints on offshore foraging in harbour seals
title_full_unstemmed	Drivers and constraints on offshore foraging in harbour seals
title_sort	drivers and constraints on offshore foraging in harbour seals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/282b5dda9afd4013b5c2c8e9a2f5c05c
work_keys_str_mv	AT hmvance driversandconstraintsonoffshoreforaginginharbourseals AT skhooker driversandconstraintsonoffshoreforaginginharbourseals AT lmikkelsen driversandconstraintsonoffshoreforaginginharbourseals AT avanneer driversandconstraintsonoffshoreforaginginharbourseals AT jteilmann driversandconstraintsonoffshoreforaginginharbourseals AT usiebert driversandconstraintsonoffshoreforaginginharbourseals AT mjohnson driversandconstraintsonoffshoreforaginginharbourseals
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Drivers and constraints on offshore foraging in harbour seals

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