Translator Disclaimer
1 April 2003 Use of a gel documentation system to measure feather growth bars
Author Affiliations +
Abstract

Feather growth bar widths have become a standard index of nutritional condition in ornithological research. Traditional techniques of measuring these bars are difficult and slow because the bars are often hard to see. We present a fast and repeatable method of visualizing and measuring growth bars using a gel documentation system from Alpha-Innotech Corporation. This system takes digital photos of objects in a low light chamber. These photos can then be enhanced and measured on a computer. We show that this system can be used to quickly obtain repeatable measurements of growth bars that are highly correlated with those obtained using traditional methods. The high repeatability and low inter-observer variability of our results also validates more traditional methods of ptilochronology.

Matthew D. Shawkey, Michelle L. Beck, and Geoffrey E. Hill "Use of a gel documentation system to measure feather growth bars," Journal of Field Ornithology 74(2), (1 April 2003). https://doi.org/10.1648/0273-8570-74.2.125
Received: 28 February 2002; Accepted: 1 May 2002; Published: 1 April 2003
JOURNAL ARTICLE
4 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top