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Hi Daryl,
All good points. I believe there is a strong
connection between the abundances of these two species. Whether causal or not is
hard to say. Certainly the increase in the Myna population since 1981 matched a
decrease in the Starling population. There is little benefit in removing the
Mynas if the Starlings increase in numbers again. The rate of increase of the
Myna had already started to reduce by about 1998 (GBS data). One thing I don't
agree on though is the suggestion that our Starlings migrate. In Europe they do
but don't appear to do so, here. They do disperse though, at the times that you
suggest. Recorded abundance of the Starling does not vary greatly during the
year (GBS data), tending to be lowest in spring, due to lesser flocking then and
more birds breeding.
Philip
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