Abstract
We studied predation risk in relation to nest location and subcolony size in Southern Rockhopper Penguins (Eudyptes chrysocome chrysocome) during the chick-rearing period. Striated Caracaras (Phalcoboenus australis), the main predator, preferentially attacked from tussock grasses which are found in the periphery of all subcolonies (peripheral tussocks) and often scattered within them (central tussocks). The greatest numbers of predation and attempted predation events were observed on nests in the periphery of the subcolony next to peripheral tussocks, and on those nests next to central tussocks. Central tussocks offer Striated Caracaras an additional “edge” area from which to prey, much in the same way as do the peripheral tussocks. Predation rate per individual was not correlated with subcolony size possibly due to the presence of central tussocks which, by creating an extra edge area, change the subcolony shape. There is a suggestion (P = 0.06) of increased probability of nest success with subcolony size.
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Acknowledgments
This research was completed as part of the senior author’s Masters thesis at UNCW. We thank M. Galizio and M. McCartney for their help and comments while serving on the thesis committee. We also thank Soledad Albanese, Carlos Cabrera, Christine Calleri, Carolina Gargiulo, Fernanda Malacrida, and Marcelo Turus for assistance in the field. We also thank Jonathan Meiburg and Andrea Raya Rey for sharing their observations on Striated Caracaras and Rockhopper Penguins at Staten Island. Funding for this research was provided in part by grants from the National Geographic Society (7040-01 and 7572-03) and NSF (OPP-0125098) to S. Emslie. We also appreciate the support of the Argentinean Navy and the “Ushuaia” tour vessel for transportation to and from Staten Island.
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Liljesthröm, M., Emslie, S.D., Frierson, D. et al. Avian predation at a Southern Rockhopper Penguin colony on Staten Island, Argentina. Polar Biol 31, 465–474 (2008). https://doi.org/10.1007/s00300-007-0372-1
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DOI: https://doi.org/10.1007/s00300-007-0372-1