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Re-constructing historical Adélie penguin abundance estimates by retrospectively accounting for detection bias

Citation

Southwell, C and Emmerson, L and Newbery, K and McKinlay, J and Kerry, K and Woehler, E and Ensor, P, Re-constructing historical Adelie penguin abundance estimates by retrospectively accounting for detection bias, PLoS ONE, 10, (4) Article e0123540. ISSN 1932-6203 (2015) [Refereed Article]


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Copyright Statement

Copyright: © 2015 Southwell 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.0123540

Abstract

Seabirds and other land-breeding marine predators are considered to be useful and practical indicators of the state of marine ecosystems because of their dependence on marine prey and the accessibility of their populations at breeding colonies. Historical counts of breeding populations of these higher-order marine predators are one of few data sources available for inferring past change in marine ecosystems. However, historical abundance estimates derived from these population counts may be subject to unrecognised bias and uncertainty because of variable attendance of birds at breeding colonies and variable timing of past population surveys. We retrospectively accounted for detection bias in historical abundance estimates of the colonial, land-breeding Adélie penguin through an analysis of 222 historical abundance estimates from 81 breeding sites in east Antarctica. The published abundance estimates were de-constructed to retrieve the raw count data and then re-constructed by applying contemporary adjustment factors obtained from remotely operating time-lapse cameras. The re-construction process incorporated spatial and temporal variation in phenology and attendance by using data from cameras deployed at multiple sites over multiple years and propagating this uncertainty through to the final revised abundance estimates. Our re-constructed abundance estimates were consistently higher and more uncertain than published estimates. The re-constructed estimates alter the conclusions reached for some sites in east Antarctica in recent assessments of long-term Adélie penguin population change. Our approach is applicable to abundance data for a wide range of colonial, land-breeding marine species including other penguin species, flying seabirds and marine mammals.

Item Details

Item Type:Refereed Article
Keywords:Adelie penguin, detection bias, seabird, indicator species, abundance estimate
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Population Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Woehler, E (Dr Eric Woehler)
ID Code:105911
Year Published:2015
Web of Science® Times Cited:3
Deposited By:IMAS Research and Education Centre
Deposited On:2016-01-20
Last Modified:2017-11-01
Downloads:145 View Download Statistics

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