Short-term responses of king penguins Aptenodytes patagonicus to helicopter disturbance at South Georgia |
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Authors: | Kevin A Hughes Claire M Waluda Richard E Stone Martin S Ridout John R Shears |
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Institution: | (1) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK;(2) Institute of Mathematics and Statistics, University of Kent at Canterbury, Canterbury, Kent, CT2 7NF, UK |
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Abstract: | The short-term behavioural effects of helicopter overflights on breeding king penguins Aptenodytes patagonicus at South Georgia were examined. Seventeen helicopter overflights were made at altitudes between 230 and 1,768 m (750–5,800 ft)
above ground level. Noise from the aircraft engines and helicopter blades increased sound levels in the colony from a background
level of 65–69 dB(A) to a maximum mean peak level of 80 dB(A) during overflights. Penguin behaviour changed significantly
during all overflights at all altitudes compared to the pre- and post-flight periods. Pre-overflight behaviour resumed within
15 min of the aircraft passing overhead and no chicks or eggs were observed to be taken by predators during overflights. Non-incubating
birds showed an increased response with reduced overflight altitude, but this was not observed in incubating birds. Variability
in overflight noise levels did not affect significantly the behaviour of incubating or non-incubating birds. Penguins exhibited
a reduced response to overflights as the study progressed (despite later flights generally being flown at lower altitudes)
suggesting some degree of habituation to aircraft. To minimise disturbance to king penguins we recommend a precautionary approach
such that overflights are undertaken at the maximum altitude that is operationally practical, or preferably are avoided altogether. |
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Keywords: | Aptenodytes patagonicus Behaviour Disturbance Helicopter King penguin Overflight |
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