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Multi-scale factors influencing seabird assemblages in the African sector of the Southern Ocean

Published online by Cambridge University Press:  31 May 2013

Morgan L. Commins ,
Isabelle Ansorge  and
Peter G. Ryan
Morgan L. Commins*
Affiliation:
Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
Isabelle Ansorge
Affiliation:
Department of Oceanography, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
Peter G. Ryan
Affiliation:
Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
*
[email protected]
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Abstract

Oceanic fronts are important foraging areas for many top predators, but they also define biogeographical boundaries to animals in the Southern Ocean and play a role in structuring seabird assemblages. Understanding the factors driving patterns in the spatial and temporal distribution of seabirds is important to infer the likely impact of a changing climate. Latitudinal transects south of Africa in two summers indicate that fronts and sea ice extent play key roles in determining seabird assemblages. We observed 37 seabird taxa and found five seabird assemblages. The Subtropical Convergence and pack ice-edge form the strongest biogeographical boundaries, whereas the Sub-Antarctic Front and Antarctic Polar Front are less well defined. As summer progresses, the Southern Antarctic Circumpolar Current Front (the Antarctic Divergence or southern boundary of the Antarctic Circumpolar Current) becomes important, when a distinct seabird assemblage forms north of the retreating sea ice following an influx of great shearwaters Puffinus gravis (O'Reilly), blue petrels Halobaena caerulea (Gmelin), Kerguelen petrels Lugensa brevirostris (Lesson) and southern fulmars Fulmarus glacialoides (Smith). Seabird assemblages show strong seasonality and are predictable between years. They are structured primarily by latitudinal gradients and secondarily by seasonal variation in sea-surface temperature and ice cover within their latitudinal habitat zones.

Keywords

DISTLMice coveroceanic frontsPERMANOVAseasonalitysea surface temperature
Type
Biological Sciences
Information
Antarctic Science , Volume 26 , Issue 1 , February 2014 , pp. 38 - 48
Copyright
Copyright © Antarctic Science Ltd 2013 

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