About “but was still 111% greater than the 30 year average”
Yes that would be right. However, bear in mind that the 30 year average includes many years that the species did not occur in Canberra at all. Even if the population evens
off, which surely it must do, or even declines, surely over the years that 111% would tend to decrease because we get into more than 30 years and thus more years that they are common, compared to the number of years in which they were not here at all. It
was still a rarity until 1991 and numbers have increased since then. I don’t know anything of a recent decline. I encounter them throughout.
Philip
From: John Harris [
Sent: Thursday, 7 December, 2017 3:35 PM
To: Charmian Lawson; COG
Subject: Re: [canberrabirds] Crested pigeons
They do not appear to have diminished in Gungahlin over the past 20 years. I don’t know where you live, but maybe it is just a chance variation this year. CBN this year said that the reporting rate was up, the abundance
was slightly down but was still 111% greater than the 30 year average. Others more knowledgeable may correct me but it is generally said the Crested Pigeons are extending their range in SE Australia. As a bird preferring open forest, reasonably thoughtful
urban development with street trees and green spaces does not necessarily reduce its numbers.
From:
Charmian Lawson <>
Date: Thursday, 7 December 2017 at 3:16 pm
To: chatline <>
Subject: [canberrabirds] Crested pigeons
I have noticed that there are very few crested pigeons (or as we knew them as kids in Queensland, topknot pigeons) around in our area this
year. Is this the case in other parts of Canberra? Does anybody know why the population has diminished again?
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