Abstract
IT is well known that populations of many animals living at high latitudes are subject to considerable fluctuations. Fairly regular periodic variations are reported in a number of cases. The 10-yr. cycle of the rock ptarmigan in Iceland reported by Gudmundsson1 furnishes a striking example. The cause of this cycle is unknown.
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References
Gudmundsson, F., Proc. Twelfth Intern. Ornithological Congr. Helsinki, 259 (1958).
Jonsson, J., Rapp. Cons. Explor. Mer., 136, 51 (1954).
MacDonald, N. J., and Roberts, W. O., J. Geophys. Res., 65, 529 (1960).
Landsberg, H. E., Mitchell, jun., J. M., and Crutcher, H. L., Mon. Weather Rev., 87, 283 (1959).
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BODVARSSON, G., JONSSON, J. Fluctuations in Marine Populations in Icelandic Waters. Nature 192, 768–769 (1961). https://doi.org/10.1038/192768b0
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DOI: https://doi.org/10.1038/192768b0
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