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1 December 2005 Changes in the Glaucous Gull Predatory Pressure on Little Auks in Southwest Spitsbergen
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Abstract
The impact of Glaucous Gull (Larus hyperboreus) predation on the Little Auk (Alle alle) during breeding season at the Ariekammen slopes in Hornsund was compared between 1983 and 2003-04. During the nestling period, gulls killed more young Little Auks in 1983 than in 2003. During the period of the colony departure in 2003, there were more Glaucous Gulls present and they killed more Little Auks than 20 years previous. Changes were found in the strategy of the colony departure by the Little Auk. In 2004, the rate of fledglings departed from the colony during “day” hours was higher than in 1983 and a higher proportion of fledglings left the colony escorted by more than one adult bird. This could be a consequence of general increase in the Glaucous Gull numbers or a year-to-year fluctuation and needs further investigations.
Katarzyna Wojczulanis, Dariusz Jakubas and Lech Stempniewicz "Changes in the Glaucous Gull Predatory Pressure on Little Auks in Southwest Spitsbergen," Waterbirds 28(4), (1 December 2005). https://doi.org/10.1675/1524-4695(2005)28[430:CITGGP]2.0.CO;2
Received: 25 March 2005; Accepted: 1 September 2005; Published: 1 December 2005
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