Abstract
What has been responsible for the increase in Chinstrap penguin populations during the past 40 years in maritime Antarctica? One view ascribes it to an increase in availability of their prey brought on by the decrease in baleen whale stocks. The contrary opinion, attributes it to environmental warming. This causes a gradual decrease in the frequency of cold years with extensive winter sea ice cover. A number of penguin monitoring programs are in progress and are expected to provide some answers to these questions. Unfortunately, it is not easy to distinguish natural variability from anthropogenic change since penguins are easily accessible predators of krill and the feeding range of the penguins has almost overlapped with the krill fishery in time and space in the last four decades. Therefore it is important to reconstruct the change of ancient penguin abundance and distribution in the absence of human activity. Many efforts have focused on surveying the abandoned penguin rookeries, but this method has not been able to give a continuous historical record of penguin populations. In several recent studies, ancient penguin excreta was scooped from the penguin relics in the sediments of the lake on penguin rookery, Ardley Island, maritime Antarctica. In these studies, penguin droppings or guano soil deposited in the lake and changes in sediment geochemistry have been used to calculate penguin population changes based upon the geochemical composition of the sediment core. The results suggest that climate change has a significant impact on penguin populations.
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References
- 1.Fraser W.R., Trivelpiece W.Z., Ainley D.G., & Trivelpiece S.G. (1992) Increases in Antarctic penguin populations: reduced competition with whales or a loss of sea ice due to environmental warming? Polar Biol., 11, 525–531. [Google Scholar]
- 2.Kaiser J. (1997) Is warming trend harming penguins? Science, 276, 1790. [Google Scholar]
- 3.Croll D.A., & Tershy B.R. (1998) Penguins, fur seals and fishing: prey requirements and potential competition in the South Shetland islands, Antarctica. Polar Biol., 6, 365–374. [Google Scholar]
- 4.Woechier E.J., Penney R.L., Creet S.M., & Burton R.H. (1994) Impacts of human visitors on breeding success and long-term population trends in Adelie penguins at Casy, Antarctica. Polar Biol., 414, 269–274. [Google Scholar]
- 5.Wilson R.P., Culik B., Danefeid R., & Adelung D. (1991) People in Antarctica: how much do penguins care? Polar Biol., 11, 363–370. [Google Scholar]
- 6.Fraser W.R., & Patterson D.L. (1997) Human disturbance and long-term changes in Adelie penguin populations: a natural experiment at Palmer Station, Antarctic Peninsula. In: Battaglia B., Valencia J., and Walton D.W.H. (eds) Antarctic Communities: Species, Structure and Survival, pp. 445–452. Cambridge University Press. [Google Scholar]
- 7.http://www.antdiv.gov.au/science/bio/adelie_penguins/adelie_penguins.html (Adelie Penguin Monitoring Program, led by Judy Clarke and Knowles Kerry, Australian Antarctic Division).
- 8.Croxall J.R., & Prince R.A. (1979) Antarctic seabird and seal monitoring studies. Polar Rec., 19, 593–595. [Google Scholar]
- 9.Sun L.G., Xie Z.Q., & Zhao J.L. (2000) A 3,000-year record of penguin populations. Nature, 407, 858. [DOI] [PubMed] [Google Scholar]
- 10.Baroni C.R., & Oromebelli G. (1994) Abandoned penguin colonies as Holocene palaeoclimatic indicators in Antarctica. Geology, 22, 23–26. [Google Scholar]
- 11.Goodwin I. (1993) Holocene deglaciation, sea-level change and the emergence of the Windmill Islands, Budd Coast, Antarctica. Quat. Res., 40, 70–80. [Google Scholar]
- 12.Emslie S.D., Fraser W.R., Smith R.C., & Walker W. (1998) Abandoned penguin colonies and environmental change in the Palmer Station area, Anvers Island, Antarctic Peninsula. Antarct. Sci., 3, 257–268. [Google Scholar]
- 13.Smith R.C., Ainley D., Baker K., Domack E., Emslie S., Fraser B., Kennett J., Leventer A., Mosley-Thompson E., Stammerjohn S., and Vernet M. (1999) Marine ecosystem sensitivity to climate change. Bioscience, 5, 393–404. [Google Scholar]
- 14.Nishimura-Akira, Yuasa-Makoto, Nakasone-Toru, Nakahara-Masaki, Ioka-Noboru (1996) Sedimentological study of the sea bottom sediments in and around the Ross Sea continental shelf, Antarctica. In: Proceedings of the NIPR symposium on Antarctic geosciences. Moriwaki K. (ed.) Proc. NIPR Symp. Antarc. Geosci., 9, 117–126. [Google Scholar]
- 15.Hodgson D.A., & Johnston N.M. (1997) Inferring seal populations from lake sediments. Nature, 387, 30–31. [Google Scholar]
- 16.http://www.npolar.no/cep/innhold/cep_archive/Docs/Forvaltingsplaner/sssi_no33.htm (Site of Special Scientific Interest No. 33, Ardley Island, Maxwell Bay, King George Island).
- 17.Sun L.G., Xie Z.Q., & Zhao J.L. (2000, in Chinese with English abstracts) The characteristics of Sr/Ba and B/Ga in Lake Sediments on the Ardley Peninsula, maritime Antarctic. Marinegeol. Quat. Geol., 4, 44–46. [Google Scholar]
- 18.Sun L.G., Xie Z.Q., & Zhao J.L. (2000, in Chinese with English abstracts) The lake sediment of Ardley Peninsula, Antarctica: identification of penguin-dropping amended soil. Chin. J. Polar Res., 2, 106–112. [Google Scholar]
- 19.Zhao J.L. (1991) The Characteristics of the Modern Environmental Evolution in the Region of Antarctic Great Wall Station. Science Press, Beijing. [Google Scholar]
- 20.Martin F., Anton E., Wolfgang J. B., Peter W., Hannes G., Peter W.K., Hannen B.D., & Augusto M. (1995) Sediment redistribution versus paleo-productivity change; Weddell Sea margin sediment stratigraphy and biogenic particle flux of the last 250,000 years deduced from 230Thex, 10Be and biogenic barium profiles. Earth Planet. Sci. Lett., 136, 559–573. [Google Scholar]
- 21.Tatur A., & Myrcha A. (1984) Ornithogenic soils on King George Island, South Shetland Islands (Maritime Antarctic Zone). Pol. Polar Res., 4, 113–128. [Google Scholar]
- 22.Campbell I.B., & Claridge G.G.C. (1987) Antarctica: Soils, Weathering Process and Environment. p. 368. Elsevier, Amsterdam. [Google Scholar]
- 23.Myrchca A., & Tatur A. (1991) Ecological role of the current and abandoned penguin rookeries in the land environment of the maritime Antarctic. Pol. Polar Res., 12, 3–24. [Google Scholar]
- 24.Gressitt J.L., & Shoup J. (1967) Ecological notes on free-living mites in North Victoria Land. In: Gressit J.L. (ed.) Entomology of Antarctica, pp. 307–320. Am. Geophys. Union. [Google Scholar]
- 25.Tedrow J.C.F., & Ugolini F.C. (1966) Antarctic soils. In: Tedrow J.C. (ed.) Antarctic soils and soil processes, pp. 161–177. Am. Geophys. Union. [Google Scholar]
- 26.ZaIe R (1994) Changes in size of the Hope Bay Adele penguin rookery as inferred from Lake Boeckella sediment. Ecography, 17, 297–304. [Google Scholar]
- 27.Zale R. (1994) 14C age corrections in Antarctic Lake sediments inferred from geochemistry. Radiocarbon, 2, 173–185. [Google Scholar]
- 28.Chen J., & Blume H.P. (1999) Behaviours of main elements in soil-forming processes of Fildes Peninsula, the maritime Antarctic. Pedosphere, 2, 113–122. [Google Scholar]
- 29.Tatur A. (1987) Fluorine in ornithogenic soils and minerals on King George Island, west Antarctica. Pol. Polar Res., 1, 65–74. [Google Scholar]
- 30.Whitehouse I.E., Chinn T.J.H., von Hofle H.C., & McSaveney M.J. (1987) Radiocarbon contaminated penguin bones from Terra Nova Bay, Antarctica. N.Z. Antarct. Rec., 3, 11–23. [Google Scholar]
- 31.Xu Z.B., & Lou Y.R. (1994) Elements of Mathematical Geology, pp. 226–238 (Beijing University Press; in Chinese). [Google Scholar]
- 32.Mausbacher R., Muller J., and Schmidt R. (1989) Evolution of postglacial sedimention in Antarctic Lakes (King George Island). Zeitschr. Geomorph., N.F., 33, 219–234. [Google Scholar]
- 33.Clapperton C.M. (1989) Late-glacial and Holocene glacier fluctuations and environmental change on South Georgia, Southern Ocean, Quat. Res., 32, 210–228. [Google Scholar]
- 34.Sun L.G., Xie Z.Q., Zhao J.L., & Xiang L. (2001, in Chinese with English abstract), 210Pb, 137Cs dating of lake sediments from Ardley island (maritime Antarctic) and their environmental implication. J. Lake Sciences, 1, 93–96. [Google Scholar]