Summary
This paper describes some spatial foraging strategies observed in the course of the breeding season in five adult radio-tagged black-headed gulss (Larus ridibundus).
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1.
Individual foraging distances increased continuously during the nesting period.
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2.
The maximum foraging distance observed was 18.5 km.
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3.
All birds showed nearly constant flight directions over the whole breeding period.
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4.
It is suggested that the continuous increase in foraging distances reduces intraspecific competition around the colony.
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5.
Because of long foraging distances it seems to be advantageous to use only a small constant foraging sector. This behaviour can probably optimize spatial memory and enhance energetic and temporal efficiency.
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Gorke, M., Brandl, R. How to live in colonies: spatial foraging strategies of the black-headed gull. Oecologia 70, 288–290 (1986). https://doi.org/10.1007/BF00379253
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DOI: https://doi.org/10.1007/BF00379253