Should I stay or should I go? Behavioral adjustments of fur seals related to foraging success

Abstract Understanding foraging strategies and decision-making processes of predators provide crucial insights into how they might respond to changes in prey availability and in their environment to maximize their net energy input. In this work, foraging strategies of Antarctic fur seals (Arctocepha...

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Bibliographic Details
Published in:Behavioral Ecology
Main Authors: Chevallay, Mathilde, Guinet, Christophe, Jeanniard-Du-Dot, Tiphaine
Other Authors: Buston, Peter, North Pacific Research Board, Canada National Scientific and Engineering Research Council
Format: Article in Journal/Newspaper
Language:English
Published: Oxford University Press (OUP) 2022
Subjects:
Animal Science and Zoology
Ecology, Evolution, Behavior and Systematics
Antarctic
Kerguelen
Kerguelen Islands
Antarc*
Antarctic Fur Seals
Arctocephalus gazella
Callorhinus ursinus
Online Access:http://dx.doi.org/10.1093/beheco/arac012
https://academic.oup.com/beheco/article-pdf/33/3/634/43705393/arac012.pdf
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Summary:Abstract Understanding foraging strategies and decision-making processes of predators provide crucial insights into how they might respond to changes in prey availability and in their environment to maximize their net energy input. In this work, foraging strategies of Antarctic fur seals (Arctocephalus gazella, AFS) and Northern fur seals (Callorhinus ursinus, NFS) were studied to determine how they adjust their foraging behavior according to their past prey capture experiences. AFS on Kerguelen Islands are exclusively oceanic divers, while NFS population of St Paul Island shows both oceanic and neritic divers. We thus hypothesized that the two species would respond differently to a change in prey capture success depending on their foraging strategy. To test this, 40 females were equipped with tags that measured tri-axial acceleration, dive depth, and GPS coordinates, from which we derived prey capture attempts and behavioral metrics. Influence of prey capture success on horizontal and vertical movements of seals was investigated at different time scales: multi-dive, night, and trip. Both AFS and NFS traveled further during the day if they encountered low prey capture periods during the previous night. However, at the multi-dive scale, neritic NFS differed from oceanic NFS and AFS in terms of decision-making processes, e.g., both AFS and oceanic NFS dived deeper in response to low prey capture rate periods, while neritic NFS did not. Similarities in decision-making processes between NFS and AFS foraging on pelagic prey suggest that pelagic vs. neritic prey type is a key factor in defining foraging decisions of diving marine predators.

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