Horswill, C. , Ratcliffe, N., Green, J.A., Phillips, R.A., Trathan, P.N. and Matthiopoulos, J. (2016) Unravelling the relative roles of top-down and bottom-up forces driving population change in an oceanic predator. Ecology, 97(8), pp. 1919-1928. (doi: 10.1002/ecy.1452) (PMID:27859185) (PMCID:PMC5008121)
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Abstract
In the open ocean ecosystem, climate and anthropogenic changes have driven biological change at both ends of the food chain. Understanding how the population dynamics of pelagic predators are simultaneously influenced by nutrient-driven processes acting from the “bottom-up” and predator-driven processes acting from the “top-down” is therefore considered an urgent task. Using a state-space demographic model, we evaluated the population trajectory of an oceanic predator, the Macaroni Penguin (Eudyptes chrysolophus), and numerically assessed the relative importance of bottom-up and top-down drivers acting through different demographic rates. The population trajectory was considerably more sensitive to changes in top-down control of survival compared to bottom-up control of survival or productivity. This study integrates a unique set of demographic and covariate data and highlights the benefits of using a single estimation framework to examine the links between covariates, demographic rates and population dynamics.
Item Type: | Articles |
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Additional Information: | This analysis was funded by a NERC PhD studentship grant number NE/I52797/X. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Horswill, Dr Catharine and Matthiopoulos, Professor Jason |
Authors: | Horswill, C., Ratcliffe, N., Green, J.A., Phillips, R.A., Trathan, P.N., and Matthiopoulos, J. |
College/School: | College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine |
Journal Name: | Ecology |
Publisher: | Ecological Society of America |
ISSN: | 0012-9658 |
Published Online: | 05 May 2016 |
Copyright Holders: | Copyright © 2016 The Authors |
First Published: | First published in Ecology 97(8): 1919-1928 |
Publisher Policy: | Reproduced under a Creative Commons License |
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