Abstract
Hybridisation between South polar skua (C. maccormicki) and Brown skua (C. antarctica lonnbergi) in the area of the Antarctic Peninsula is known at least since the beginning of the last century but no survey has been done so far. This paper reviews information on the species composition of skua colonies of more than 10 pairs in the Antarctic Peninsula region, and the incidence of mixed pairs. Morphometrics, population size and breeding success were examined in detail at King George Island. The northward distribution of South polar skuas extended to King George Island (62°11′ S 59°00′ W), with a small outlying population on Signy Island (60°45′ S 45°36′ W), whereas Brown skuas did not breed further south than Anvers Island archipelago (64°46′ S 64°03′ W). The proportion of mixed pairs was highest at the northern end of the ∼500-km-wide hybrid zone. Body size distribution of sympatric skuas from King George Island is clearly bimodal but overlaps considerably and hybrids cannot be identified. Skua population sizes at Potter Peninsula/King George Island remained stable between 1994 and 2004. Numbers of mixed breeding pairs fluctuated more strongly than those of pure species pairs. Breeding success of Brown skuas varied the least.
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Baker SC, Barbraud C (2001) Foods of the South Polar skua Catharacta maccormicki at Ardery Island, Windmill Islands, Antarctica. Polar Biol 24:59–61
Bennet AG (1920) Breves notas sobre las aves antarticas. Hornero 2:25–34
Blechschmidt K, Peter H-U, de Korte J, Wink M, Seibold I, Helbig AJ (1993) Untersuchungen zur molekularen Systematik der Raubmöwen (Stercorariidae). Zool Jb Syst Jena 120:379–387
Bo MS, Copello S (2000) Distribution and abundance of breeding birds at Deception Island, South Shetland Islands, Antarctica, February to April 2000. Mar Orn 29:39–42
Catry P, Ratcliffe N, Furness RW (1997) Partnerships and mechanisms of divorce in the great skua. Anim Behav 54:1475–1482
Cohen BL, Baker AJ, Blechschmidt K, Dittmann DL, Furness RW, Gerwin JA, Helbig AJ, de Korte J, Marshall HD, Palma RL, Peter H-U, Ramli R, Seibold I, Willcox MS, Wilson RH, Zink RM (1997) Enigmatic phylogeny of skuas (Aves: Stercorariidae). Proc R Soc Lond B 264:181–190
Croxall JP, Prince PA, Hunter I, McInnes SJ, Copestake PG (1984) The seabirds of the Antarctic Peninsula, Islands of the Scotia Sea, and Antarctic Continent between 80°W and 20°W: their status and conservation. In: Croxall JP, Evans PGH, Schreiber RW (eds) Status and conservation of the world’s seabirds. International Council for Bird Preservation, Cambridge, pp 635–664
Fridolfsson A-K, Ellegren H (1999) A simple and universal method for molecular sexing of non-ratite birds. J Avian Biol 30:116–121
Garcia Esponda CM, Coria NR, Montalti D (2000) Breeding birds at Halfmoon Island, South Shetland Islands, Antarctica, 1995/96. Mar Orn 28:59–62
Griffiths R, Daan S, Dijkstra C (1996) Sex identification in birds using two CHD genes. Proc R Soc Lond B 263:1251–1256
Hahn S, Ritz MS, Peter H-U (2003) Living in mixed pairs - Better for fitness? A study in Skuas. In: Huiskes AHL, Gieskes WWC, Rozema J, Schorno RML, van der Vies SM, Wolff WJ (eds) Antarctic Biology in a Global Context. Backhuys, Leiden, pp 229–233
Helbig AJ, Salomon M, Bensch S, Seibold I (2001) Male-biased gene flow across an avian hybrid zone: evidence from mitochondrial and microsatellite DNA. J Evol Biol 14:277–287
Hemmings AD (1984) Aspects of the breeding biology of McCormicks skua Catharacta maccormicki at Signy Island, South Orkney Islands. Br Antarct Surv Bull 65:65–79
Lumpe P, Weidinger K (2000) Distribution, numbers and breeding of birds at the northern ice-free areas of Nelson Island, South Shetland Islands, Antarctica, 1990–1992. Mar Orn 28:41–46
Milius N (2000) The birds of Rothera, Adelaide Island, Antarctic Peninsula. Mar Orn 28:63–67
Millar CD, Anthony I, Lambert DM, Stapleton PM, Bergmann CC, Bellamy AR, Young EC (1994) Patterns of reproductive success determined by DNA fingerprinting in a communally breeding oceanic bird. Biol J Linnean Soc 52:31–48
Millar CD, Lambert DM, Young EC (1997) Minisatellite DNA detects sex, parentage, and adoption in the south polar skua. J Hered 88:235–238
Mund MJ, Miller GD (1995) Diet of the south polar skua Catharacta maccormicki at Cape Bird, Ross Island, Antarctica. Polar Biol 15:453–455
Neilson DR (1983) Ecological and behavioral aspects of the sympatric breeding of the South Polar Skua (Catharacta maccormicki) and the Brown Skua (Catharacta lonnbergi) near the Antarctic Peninsula. MSC thesis, University of Minnesota, 79 pp
Parmelee DF (1988) The hybrid skua: a southern ocean enigma. Wilson Bull 100:345–356
Parmelee DF (1992) Stercorariinae. In: Parmelee DF (ed) Antarctic birds: ecological and behavioral approaches. University of Minnesota Press, Minneapolis, pp 135–157
Parmelee DF, Pietz PJ (1987) Philopatry, mate and nest-site fidelity in the Brown Skuas of Anvers Island, Antarctica. Condor 89:916–919
Peter H-U, Kaiser M, Gebauer A (1990) Ecological and morphological investigations on South Polar Skuas (Catharacta maccormicki) and Brown Skuas (Catharacta skua lonnbergi) on Fildes Peninsula, King George Island, South Shetland Islands. Zool Jb Syst Jena 117:201–218
Phillips RA, Dawson DA, Ross DJ (2002) Mating patterns and reversed size dimorphism in Southern Skuas (Stercorarius skua lonnbergi). Auk 119:858–863
Phillips RA, Phalan B, Forster IP (2004) Diet and long-term changes in population size and productivity of brown skuas Catharacta antarctica lonnbergi at Bird Island, South Georgia. Polar Biol 27:555–561
Pietz PJ (1984) Aspects of the behavioral ecology of sympatric South Polar Skua and Brown Skua near Palmer Station, Antarctica. PhD thesis, University of Minnesota, 176 pp
Pietz PJ (1987) Feeding and nesting ecology of sympatric South Polar and Brown skuas. Auk 104:617–627
Pietz PJ, Parmelee DF (1994) Survival, site and mate fidelity in South Polar Skuas Catharacta maccormicki at Anvers Island, Antarctica. Ibis 136:32–38
Quintana RD, Cirelli V, Orgeira JL (2000) Abundance and spatial distribution of bird populations at Cierva Point, Antarctic Peninsula. Mar Orn 28:21–27
Reinhardt K (1997) Food and feeding of Antarctic skua chicks Catharacta antarctica lonnbergi and C. maccormicki. J Ornithol 138:199–213
Rising JD, Somers KM (1989) The measurement of overall body size in birds. Auk 106:666–674
Rolando A (1993) A study on the hybridization between carrion and hooded crow in northwestern Italy. Ornis Scan 24:80–83
Saino N, Villa S (1992) Pair composition and reproductive success across a hybrid zone of Carion Crows and Hooded Crows. Auk 109:543–555
Silva MP, Favero M, Casaux R, Baroni A (1998) The status of breeding birds at Harmony Point, Nelson Island, Antarctica in summer 1995/96. Mar Orn 26:75–78
Vaughan DG, Marshall GJ, Connolley WM, Parkinson C, Mulvaney R, Hodgson DA, King JC, Pudsey CJ, Turner J (2003) Recent rapid regional climate warming on the Antarctic Peninsula. Clim Change 60:243–274
Veen T, Borge T, Griffith SC, Saetre G-P, Bures S, Gustafsson L, Sheldon BC (2001) Hybridization and adaptive mate choice in flycatchers. Nature 411:45–50
Watson GE (1975) Birds of the Antarctic and Sub-Antarctic. American Geophysical Union, Washington
Woehler EJ, Cooper J, Croxall JP, Fraser WR, Kooyman GL, Miller GD, Nel DC, Patterson DL, Peter H-U, Ribic CA, Salwicka K, Trivelpiece WZ, Weimerskirch H (2001) A statistical assessment of the status and trends of Antarctic and subantarctic seabirds. Report on SCAR BBS Workshop on Southern Ocean seabird populations. May 1999, Bozeman, Montana
Wood RC (1971) Population dynamics of breeding South Polar Skuas of unknown age. Auk 88:805–814
Young EC (1963) Feeding habits of the South Polar Skua Catharacta maccormicki. Ibis 105:301–318
Young EC (1994) Skua and penguin, predator and prey. Oxford University Press, Oxford
Acknowledgements
We thank all field workers, especially K. Reinhardt for providing data during the longterm study. M. Dunn, W. Fraser and M. Sander provided unpublished skua population estimates from Signy Island, Anvers Island and from Elephant Island, respectively. P. J. Pietz and an anonymous referee provided helpful comments on the manuscript. The study was supported by DFG (Pe454).
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Ritz, M.S., Hahn, S., Janicke, T. et al. Hybridisation between South polar skua (Catharacta maccormicki) and Brown skua (C. antarctica lonnbergi) in the Antarctic Peninsula region. Polar Biol 29, 153–159 (2006). https://doi.org/10.1007/s00300-005-0034-0
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DOI: https://doi.org/10.1007/s00300-005-0034-0