To: "Birding-aus (E-mail)" <>
Subject: sparrows
From: "Philip Veerman" <>
Date: Mon, 27 Feb 2006 14:21:29 +1100
About these various messages. Results from 21 years of GBS in Canberra suggest that you can't learn very much from just one or two years of a survey. Bird populations are far too variable and too many factors are operating. Trying to read too much from too little data is risky. Impacts of Noisy Miners are localised. See also a paper by Peter Woodall about that. Woodall, P.F. 1996, ?Limits to the distribution of the House Sparrow Passer domesticus in suburban Brisbane, Australia?, Ibis 138: 337?340. Also in Canberra the increase in the Common Myna matches exactly in timing to the decrease in the Common Starling (and possibly the Red-rumped Parrot but no other parrots). This is strong circumstantial evidence of a connection, not proof. Decrease in House Sparrows also correlates in time to the increase in the Common Myna and the Crested Pigeon. The Pied Currawong has on average NOT increased in Canberra. That is with the extra detail that: yes summer abundance and local breeding of the Pied Currawong has increased markedly (abundance doubling over 21 years), whereas winter numbers and flock size has decreased by a much greater amount. It is their presence and breeding during summer that matters, when they impact on other birds.
Full details in my GBS Report.
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