Sexing California Gulls Using Morphometrics and Discriminant Function Analysis

作者：Herring Garth^*; Ackerman Joshua T; Eagles Smith Collin A; Takekawa John Y

来源：Waterbirds, 2010, 33(1): 79-85.

DOI：10.1675/063.033.0109

• California
• discriminant function
• Larus californicus
• San Francisco
• Bay sex determination

A discriminant function analysis (DFA) model was developed with DNA sex verification so that external morphology could be used to sex 203 adult California Gulls (Larus californicus) in San Francisco Bay (SFB) The best model was 97% accurate and included head to-bill length culmen depth at the gonys and wing length Using an iterative process the model was simplified to a single measurement (head to-bill length) that still assigned sex correctly 94% of the time A previous California Gull sex determination model developed for a population in Wyoming was then assessed by fitting SFB California Gull measurement data to the Wyoming model this new model failed to converge on the same measurements as those originally used by the Wyoming model Results from the SFB discriminant function model were compared to the Wyoming model results (by using SFB data with the Wyoming model) the SFB model was 7% more accurate for SFB California gulls The simplified DFA model (head to-bill length only) provided highly accurate results (94%) and minimized the measurements and time required to accurately sex California Gulls Received 29 January 2009 accepted 29 November 2009

• 出版日期2010-3