Grecian, W. J., Taylor, G. A., Loh, G., McGill, R. A.R. , Miskelly, C. M., Phillips, R. A., Thompson, D. R. and Furness, R. W. (2016) Contrasting migratory responses of two closely-related seabirds to long-term climate change. Marine Ecology Progress Series, 559, pp. 231-242. (doi: 10.3354/meps11875)
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Abstract
Many marine predators migrate between breeding and non-breeding areas to target resources that are seasonal but spatio-temporally predictable, and so are vulnerable to climate-induced changes in prey phenology and abundance. In the Southern Ocean, small petrels are major consumers, but perturbations in the ecosystem through ocean warming are altering food-web structure and have been linked to poleward shifts in distribution of their cold-water zooplankton prey. In this study, we focus on 2 small congeneric petrels; the broad-billed prion Pachyptila vittata, and the Antarctic prion P. desolata. Both are planktivorous, but the broad-billed prion specialises in feeding on large copepods. We investigate historical trends in non-breeding distribution by analysing feather stable isotope ratios from a time-series dating back to 1926, and examine contemporary non-breeding distributions of broad-billed prions tracked using miniaturised geolocation-immersion loggers. After controlling temporally for the Suess effect, we found that the δ13C signatures of Antarctic prions, but not broad-billed prions, declined during the study period. This suggests a southward shift in Antarctic prion non-breeding distribution over the last century. Both species exhibited significant declines in δ15N during the same period, indicative of long-term decreases in marine productivity in their moulting areas, or changes in the trophic structure of prey communities. Tracked broad-billed prions migrated ca. 1000 km to an area east of the breeding colony where the Louisville seamount chain bisects the subtropical front. Topographically driven upwellings are stable and predictable features and may be crucial in aggregating plankton. Targeting seamounts could therefore mitigate the impact of climate-induced prey shifts by providing refugia for the broad-billed prion.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Grecian, Dr James and McGill, Dr Rona and Furness, Professor Robert |
Authors: | Grecian, W. J., Taylor, G. A., Loh, G., McGill, R. A.R., Miskelly, C. M., Phillips, R. A., Thompson, D. R., and Furness, R. W. |
College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine |
Journal Name: | Marine Ecology Progress Series |
Publisher: | Inter Research |
ISSN: | 0171-8630 |
ISSN (Online): | 1616-1599 |
Published Online: | 09 November 2016 |
Copyright Holders: | Copyright © 2016 The Authors |
First Published: | First published in Marine Ecology Progress Series 559:231-242 |
Publisher Policy: | Reproduced under a creative commons license |
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