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Weathering a dynamic seascape: influences of wind and rain on a seabirdís year-round activity budgets

Citation

Pistorius, PA and Hindell, MA and Tremblay, Y and Rishworth, GM, Weathering a dynamic seascape: influences of wind and rain on a seabird's year-round activity budgets, PLoS ONE, 10, (11) Article e0142623. ISSN 1932-6203 (2015) [Refereed Article]


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Copyright Statement

Copyright: © 2015 Pistorius et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0142623

Abstract

How animals respond to varying environmental conditions is fundamental to ecology and is a question that has gained impetus due to mounting evidence indicating negative effects of global change on biodiversity. Behavioural plasticity is one mechanism that enables individuals and species to deal with environmental changes, yet for many taxa information on behavioural parameters and their capacity to change are lacking or restricted to certain periods within the annual cycle. This is particularly true for seabirds where year-round behavioural information is intrinsically challenging to acquire due to their reliance on the marine environment where they are difficult to study. Using data from over 13,000 foraging trips throughout the annual cycle, acquired using new-generation automated VHF technology, we described sex-specific, year-round activity budgets in Cape gannets. Using these data we investigated the role of weather (wind and rain) on foraging activity and time allocated to nest attendance. Foraging activity was clearly influenced by wind speed, wind direction and rainfall during and outside the breeding season. Generally, strong wind conditions throughout the year resulted in relatively short foraging trips. Birds spent longer periods foraging when rainfall was moderate. Nest attendance, which was sex-specific outside of the breeding season, was also influenced by meteorological conditions. Large amounts of rainfall (> 2.5 mm per hour) and strong winds (> 13 m s-1) resulted in gannets spending shorter amounts of time at their nests. We discuss these findings in terms of life history strategies and implications for the use of seabirds as bio-indicators.

Item Details

Item Type:Refereed Article
Keywords:activity budget, gannets, weather
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments
Author:Hindell, MA (Professor Mark Hindell)
ID Code:106515
Year Published:2015
Web of Science® Times Cited:2
Deposited By:IMAS Research and Education Centre
Deposited On:2016-02-12
Last Modified:2017-11-01
Downloads:420 View Download Statistics

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