Spatiotemporal predictability of schooling and nonschooling prey of Pigeon Guillemots

The Condor
By: , and 

Links

Abstract

Low spatiotemporal variability in the abundance of nonschooling prey might allow Pigeon Guillemots (Cepphus columba) to maintain the high chick provisioning rates that are characteristic of the species. We tested predictions of this hypothesis with data collected with beach seines and scuba and hydroacoustic surveys in Kachemak Bay, Alaska, during 1996–1999. Coefficients of variability were 20–211% greater for schooling than nonschooling prey on day, seasonal, and km scales. However, the proportion of schooling prey in chick diets explained relatively little variability in Pigeon Guillemot meal delivery rates at the scale of hours (r2 = 0.07) and weeks (r2 = 0.19). Behavioral adaptations such as flexible time budgets likely ameliorate the negative effects of high resource variability, but we propose that these adaptations are only effective when schooling prey are available at distances well below the maximum foraging range of the species.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Spatiotemporal predictability of schooling and nonschooling prey of Pigeon Guillemots
Series title The Condor
DOI 10.1650/7330
Volume 106
Issue 2
Year Published 2004
Language English
Publisher Cooper Ornithological Society
Contributing office(s) Alaska Science Center
Description 6 p.
First page 410
Last page 415
Country United States
State Alaska
Other Geospatial Cooke Inlet, Kachemak Bay
Google Analytic Metrics Metrics page
Additional metadata about this publication, not found in other parts of the page is in this table