Learning the task: age-related differences in the proficiency of Black-headed Gulls kleptoparasitising Lapwings

Authors

  • Hans Källander Department of Biology, Lund University

DOI:

https://doi.org/10.34080/os.v10.22883

Keywords:

foraging ecology, interspecific interaction, interspecific competition, behaviour

Abstract

How Black-headed Gulls’ Larus ridibundus skill at kleptoparasitising Lapwings Vanellus vanellus improved during the course of the autumn was studied in southernmost Sweden from 1988 to 1997. Relative to adults, whose success rate remained constant, that of juveniles increased rapidly from late July to early August and more slowly thereafter. Overall success rate of adults was c. 63% and that of juveniles c. 45% based on about 5,000 attacks by each age category. In contrast to kleptoparasitism, the feeding rates of adults and juveniles did not differ when they used some other feeding methods, not even when catching flying insects on the wing about a month after the young birds fledged. This suggests that kleptoparasitism is a difficult feeding method that takes time to perfect.

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Published

2000-01-01

How to Cite

Källander, H. (2000). Learning the task: age-related differences in the proficiency of Black-headed Gulls kleptoparasitising Lapwings. Ornis Svecica, 10(1), 7–12. https://doi.org/10.34080/os.v10.22883

Issue

Section

Research Papers