Whistler Reporting Rates

To: "'canberrabirds chatline'" <>
Subject: Whistler Reporting Rates
From: "Paul Fennell" <>
Date: Wed, 25 Apr 2012 12:08:54 +1000

Hello everyone, including whistlers, tweeters, and chirpers!


I have constructed two graphs, one from the GBS data, and one from all non-GBS surveys, showing the reporting rates of both Golden and Rufous Whistlers.


I calculated the reporting rates by:

For the GBS survey, counting the number of weeks the species was recorded each year, divided by the total number of weeks recorded that year, to arrive at a percentage.

For the other surveys, counting the number of data sheets recording the species each year, divided by the total number of sheets recorded that year, to arrive at a percentage.






The two graphs show some interesting ups and downs, including one would suspect, the effect of the bushfires on Rufous Whistlers.  I leave it to you to make further interpretations.






Paul Fennell

Editor Annual Bird Report

COG Databases Manager


026254 1804



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