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Environmental drivers of oceanic foraging site fidelity in central place foragers

Citation

Foo, D and Hindell, M and McMahon, C and Goldsworthy, S and Bailleul, F, Environmental drivers of oceanic foraging site fidelity in central place foragers, Marine Biology, 167, (6) Article 76. ISSN 0025-3162 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Springer-Verlag GmbH Germany, part of Springer Nature

DOI: doi:10.1007/s00227-020-03685-y

Abstract

Finding food is crucial to the survival and reproductive success of individuals. Fidelity to previous profitable foraging sites may bring benefits to individuals as they can allocate more time to foraging rather than searching for prey. We studied how environmental conditions influence when lactating long-nosed fur seals (Arctocephalus forsteri) adopt a risky (low fidelity) or conservative (high fidelity) foraging strategy at two intra-annual temporal scales when foraging in a highly variable oceanic environment. Core foraging areas (CFAs; n = 534; 30 × 30 km cells) of consecutive foraging trips were obtained from geolocation tracks of 12 females from summer to winter in 2016 (n = 5) and 2017 (n = 7). We used the spatial variability (standard deviation) of CFAs between or among oceanic foraging trips as a proxy for individual foraging site fidelity (IFSF). Over the entire oceanic foraging period (n = 12), IFSF in the latitudinal axis increased with stronger sea-surface temperature gradient (SSTgrad), but decreased with greater SSTgrad and sea-surface height gradient variability. Over a period of two consecutive oceanic foraging trips (n = 66), IFSF decreased with greater SSTgrad variability in the earlier foraging trip. LNFS show evidence that they use IFSF as a strategy to potentially optimise food acquisition, and that this behaviour is influenced by mesoscale oceanographic parameters.

Item Details

Item Type:Refereed Article
Keywords:fur seal, foraging
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Behavioural ecology
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Foo, D ( Dahlia Foo)
UTAS Author:Hindell, M (Professor Mark Hindell)
ID Code:142223
Year Published:2020
Web of Science® Times Cited:2
Deposited By:Ecology and Biodiversity
Deposited On:2020-12-23
Last Modified:2021-04-28
Downloads:0

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