Document Type

Article

Publication Version

Published Version

Publication Date

8-2007

Journal or Book Title

Condor

Volume

109

Issue

3

First Page

638

Last Page

647

DOI

10.1650/8236.1

Abstract

Precocial young often experience high mortality prior to achieving flight, especially in the first days after hatching. We quantified relationships between chick age, survival, behavior, and response to natural and anthropogenic danger for the threatened Western Snowy Plover (Charadrius alexandrinus nivosus) in coastal northern California, USA. Plover chicks were most likely to die in the first three days of their 28-day prefledging period, especially on sandy ocean beaches compared to coarser substrates of river habitats. Chick survival in both habitats increased across the ∼120-day chick-rearing period. Improved survival of older chicks coincided with an age-related reduction in brooding and increased distance from the tending parent, which was not related to season. Lower survival of younger chicks was correlated with a tendency to lie motionless when approached by humans; nearly all older chicks responded to human approach by running to evade danger. Chicks of all ages were more likely to lie motionless when potential avian predators flew nearby. Age-dependent survival of Snowy Plover chicks paralleled a trend of increasing development, thermal independence from adults, and capability of evading predators.

Comments

This article is from Condor 109 (2007): 638, doi:10.1650/8236.1. Posted with permission.

Copyright Owner

The Cooper Ornithological Society

Language

en

File Format

application/pdf