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Horizontal‑vertical movement relationships: Adélie penguins forage continuously throughout provisioning trips

Citation

Riaz, J and Bestley, S and Wotherspoon, S and Emmerson, L, Horizontal‑vertical movement relationships: Adelie penguins forage continuously throughout provisioning trips, Movement Ecology, 9, (1) Article 43. ISSN 2051-3933 (2021) [Refereed Article]


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Copyright Statement

Copyright 2021 the Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1186/s40462-021-00280-8

Abstract

Background

Diving marine predators forage in a three-dimensional environment, adjusting their horizontal and vertical movement behaviour in response to environmental conditions and the spatial distribution of prey. Expectations regarding horizontal-vertical movements are derived from optimal foraging theories, however, inconsistent empirical findings across a range of taxa suggests these behavioural assumptions are not universally applicable.

Methods

Here, we examined how changes in horizontal movement trajectories corresponded with diving behaviour and marine environmental conditions for a ubiquitous Southern Ocean predator, the Adélie penguin. Integrating extensive telemetry-based movement and environmental datasets for chick-rearing Adélie penguins at Béchervaise Island, we tested the relationships between horizontal move persistence (continuous scale indicating low [‘resident’] to high [‘directed’] movement autocorrelation), vertical dive effort and environmental variables.

Results

Penguins dived continuously over the course of their foraging trips and lower horizontal move persistence corresponded with less intense foraging activity, likely indicative of resting behaviour. This challenges the traditional interpretation of horizontal-vertical movement relationships based on optimal foraging models, which assumes increased residency within an area translates to increased foraging activity. Movement was also influenced by different environmental conditions during the two stages of chick-rearing: guard and crèche. These differences highlight the strong seasonality of foraging habitat for chick-rearing Adélie penguins at Béchervaise Island.

Conclusions

Our findings advance our understanding of the foraging behaviour for this marine predator and demonstrates the importance of integrating spatial location and behavioural data before inferring habitat use.

Item Details

Item Type:Refereed Article
Keywords:foraging behaviour, Pygoscelis adeliae, area-restricted search, horizontal movement, dive behaviour, habitat use
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Riaz, J (Mr Javed Riaz)
UTAS Author:Bestley, S (Dr Sophie Bestley)
UTAS Author:Wotherspoon, S (Dr Simon Wotherspoon)
ID Code:146959
Year Published:2021
Deposited By:Directorate
Deposited On:2021-10-05
Last Modified:2021-11-02
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