Myna traps and numbers

[martin butterfield <>]

As requested by Michael I have attached a graph showing the A values for starlings.  Note that:

• The series start at Year 2, since the data for starlings is somewhat distorted by observations of a large roost in Year 1 which was not used in subsequent years; and
• I have deliberately used the same scale for both series to contrast the peak numbers of the two species.

I will let others consider the biology underlying these series.

Martin

On Thu, Jun 18, 2009 at 6:32 AM, Michael & Janette Lenz <> wrote:

While there may certainly be possible interactions between Mynas and Starlings (espec. regarding competition for nest sites), I would still be surprised if there is overall a direct link in the rise or fall of one of the species due to the fall or rise of the other species.

 

Starling and Myna have very different dynamics. The Starling decline was Canberra-wide and occurred in too many places without that Mynas were present. And now Starlings are coming back in areas with still good Myna numbers as I could also see last year during my Ainslie survey. Some buildings had both species present as breeders.

 

Anyhow, perhaps Martin could do again his good work and prepare, his time permitting, a graph on the A values for the Starling we then could compare with the one for the Myna.

 

Michael Lenz