Prey Detection by Intertidally Feeding Lapwing
Version of Record online: 26 APR 2010
1985 Blackwell Verlag GmbH
Zeitschrift für Tierpsychologie
Volume 67, Issue 1-4, pages 45–57, January-December 1985
How to Cite
Metcalfe, N. B. (1985), Prey Detection by Intertidally Feeding Lapwing. Zeitschrift für Tierpsychologie, 67: 45–57. doi: 10.1111/j.1439-0310.1985.tb01377.x
- Issue online: 26 APR 2010
- Version of Record online: 26 APR 2010
- Received: September 23, 1983; Accepted: January 12, 1984
Abstract and Summary
Observations on lapwing foraging on estuarine mudflats showed that:
- 1They detected prey during stationary scanning pauses.
- 2The majority of prey items were taken within three paces of the scanning position; the polychaete Nereis diversicolor was taken at greater distances than the amphipod Corophium volutator.
- 3Pecks that proved abortive occurred after a greater number of paces than successful pecks, and their proportionate incidence increased with distance from the pause position; it is argued that aborted pecks are due to misidentification of prey cues rather than escape of the prey.
- 4After failing to detect prey from one position, birds gave up and moved to a new scanning position; the median distance moved corresponded to the radius of an area within which 99% of prey items were located.
- 5The total distance moved while taking prey (including steps taken after capture but before the next scanning pause) rarely took birds beyond the boundary of the previously scanned area; birds that chose to remain in the previous scanning position had higher subsequent probabilities of taking prey than those that moved to scan a fresh area.
- 6There was a negative correlation between success rate (proportion of pauses that resulted in prey capture) and rate of movement (steps per min); this was caused by increased distances moved between pauses in low quality foraging areas, and not by handling times interfering with searching, as there was a positive correlation between the number of prey handled per min and searching rate (number of pauses per min).