Abstract
The foraging strategies of king penguins from Heard and Macquarie islands were compared using satellite telemetry, time-depth recorders and diet samples. Trip durations were 16.8±3.6 days and 14.8±4.1 days at Macquarie and Heard islands, respectively. At Macquarie Island, total distances travelled were 1281±203 km compared to 1425±516 km at Heard Island. The total time the penguins spent at sea was 393±66 h at Macquarie Island and 369±108 h at Heard Island. The penguins from Macquarie Island performed more deep dives than those from Heard Island. King penguins from Macquarie Island travelled 1.5±0.2 km h−1 day−1 compared to 1.3±0.1 km h−1 day−1. At Macquarie Island, 19% of dives were upto 70–90 m depth compared to 35% at Heard Island. The main dietary prey species were the fish Krefftychthis anderssoni and the squid Moroteuthis ingens in both groups. The differences in the at-sea distribution and the foraging behaviour of the two groups of penguins were possibly related to differences in oceanography and bathymetric conditions around the two islands. Dietary differences may be due to interannual variability in prey availability since the two colonies were studied during incubation but in different years.
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Acknowledgements
We would like to thank all those who helped in the field and who made this work possible. Particular thanks go to Drs. Peter Dann and Simon Jarman for their support at Heard Island. Many thanks to Dr. Yves Cherel for his help in the identification of squid beaks and to three anonymous referees whose constructive comments improved the quality of this manuscript. This work was carried out as part of the Australian Antarctic Science program. Both studies were approved by the Australian Animal Ethics Committee (Department for the Environment and Heritage).
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Appendix
Appendix
Trip characteristics of individual king penguins from Macquarie Island (1999) and Heard Island (2004) during incubation
Penguin | Maximal distance from colony (km) | Total travel distance (km) | Total time at sea (day) | Trip type |
---|---|---|---|---|
Macquarie Island | ||||
MK02 | 510 | 1,258 | 14.3 | C |
MK03 | 613 | 1,542 | 19.7 | C |
MK04 | 312 | 1,119 | 16.7 | D |
MK05 | 607 | 1,478 | 19.0 | C |
MK06 | 537 | 1,229 | 15.0 | C |
MK07 | 623 | 1,456 | 17.8 | C |
MK08 | 532 | 1,398 | 17.0 | C |
MK09 | 487 | 1,175 | 13.6 | C |
MK10 | 358 | 981 | 15.8 | D |
MK11 | 611 | 1,461 | 20.7 | C |
MK12 | 408 | 1,013 | 12.1 | C |
MK13 | 324 | 788 | 12.7 | D |
MK14 | 591 | 1,429 | 16.6 | C |
MK15 | 454 | 1,169 | 15.0 | C |
MK16 | 593 | 1,485 | 19.7 | C |
MK17 | 596 | 1,359 | 13.8 | D |
MK18 | 426 | 1,035 | 13.3 | C |
MK19 | 501 | 1,281 | 15.5 | C |
MK20 | 583 | 1,604 | 22.0 | C |
MK21 | 537 | 1,327 | 28.4 | C |
MK22 | 586 | 1,438 | 17.5 | C |
MK23 | 463 | 1,226 | 15.5 | C |
MK24 | 510 | 1,228 | 14.6 | C |
Heard Island | ||||
HK01 | 183 | 901 | 9.2 | D |
HK02* | 277 | 631 | 5.7 | D |
HK03 | 422 | 1,667 | 17.6 | D |
HK04 | 348 | 1,891 | 16.8 | D |
HK05 | 245 | 1,286 | 12.0 | C |
HK06 | 275 | 2,010 | 14.2 | C |
HK07 | 329 | 1,533 | 14.4 | C |
HK08 | 226 | 1,388 | 16.1 | C |
HK09 | 230 | 1,489 | 16.3 | D |
HK10 | 161 | 916 | 10.5 | D |
HK11 | 286 | 1,303 | 13.0 | D |
HK12 | 277 | 1,566 | 14.0 | C |
HK13 | 311 | 1,271 | 11.8 | D |
HK14 | 228 | 1,021 | 15.0 | D |
HK15 | 235 | 1,744 | 15.0 | D |
HK16 | 282 | 2,083 | 17.3 | C |
HK17 | 273 | 1,731 | 17.0 | C |
HK18 | 255 | 1,203 | 12.8 | C |
HK19 | 424 | 2,578 | 21.2 | C |
HK20 | 435 | 1,475 | 14.9 | C |
HK21 | 206 | 693 | 7.8 | C |
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Wienecke, B., Robertson, G. Comparison of foraging strategies of incubating king penguins Aptenodytes patagonicus from Macquarie and Heard islands. Polar Biol 29, 424–438 (2006). https://doi.org/10.1007/s00300-005-0074-5
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DOI: https://doi.org/10.1007/s00300-005-0074-5