To: "Ricki Coughlan" <>, "Messages Birding-aus" <>
Subject: sparrows
From: "michael norris" <>
Date: Mon, 27 Feb 2006 13:15:05 +1100
Hi all
Ricki said
"Somebody cited the recent study in the UK which demonstrated insect declines during critical breeding stages for the House Sparrow. This may be the cause of the House Sparrow's decline in the UK but it may not be the same cause here (that's not to say that it may be too, as we have no studies on this in Australia and who bothers to study declines in feral birds here?)."
But do we have ANY studies of changing insect populations either through direct surveys or through examination of bird diets?
Climate change - or "ordinary" droughts - will surely (?), together with artificial light, be affecting insect diversity and abundance.   This in turn will affect process like pollination, predator populations, nutrient recycling....
Incidentally, both House and Tree Sparrow populations seem to be shrinking here.  And we have had an increase from zero to two pairs of Collared Sparrowhawks breeding .
Michael Norris
Bayside, SE Melbourne
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