[TN-Bird] Tagged gull study

From: Carole Gobert <cpgobert@xxxxxxxxxxx>
To: Tennessee Bird List <tn-bird@xxxxxxxxxxxxx>
Date: Mon, 17 Jan 2011 19:03:18 -0500
In 2007/2008 ring-billed gulls were reported in Tennessee with colored patagial 
tags.  I saw two of those gulls and reported them and as a result got on the 
City of Chicago's Dept. of Environment mailing list for the study.  They issued 
a report in 2008 and now they have sent me a later report with a different 
focus:
 
"ABSTRACT The possible role of tag color in mediating behaviors that could bias 
resighting rate has not been examined. In a study that began in 2007, we marked 
725 ring-billed gulls (Larus delawarensis) with Bondcote royal blue, green, 
yellow, or orange patagial tags. Reports we gathered over 2 years indicated 
approximately a 3.4:1 bias in resighting rate toward yellow or orange tags. The 
observed bias is inconsistent with color-associated visibility bias or 
differential mortality among color-tagged breeding adults. Potential behavioral 
effects of tag color on individuals and conspecifics should be considered by 
biologists when planning marking studies.
 
The report is a 5-page pdf file.  I will be glad to share it with anyone who 
requests but I don't think I can attach it to a TN-Bird posting."
 
Just let me know and I'll email you the report.
 
Carole Gobert, Knoxville
                                          
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[TN-Bird] Tagged gull study

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