OBPs

To:
Subject:	OBPs
From:	Andrew Taylor <>
Date:	Tue, 28 Feb 2012 08:30:57 +1100

On Mon, Feb 27, 2012 at 11:47:18PM +1100, Debbie Lustig wrote:
> This year's breeding at Melaleuca has produced 12 juveniles so
> far. Twenty one adults were observed at the start of the summer
> ie 33 known birds.  Three females of the 21 adults are unaccounted
> for and believed to have been breeding somewhere else in the range.

The arithmetic is a bit against the OBPs unfortunately.  Annual survival
rate for OBP adults is thought to be near 65% and nearer 50% in the
first year.  So on average 14 of 21 adults and 6 of 12 juveniles will
make it back to Melaleuca next summer - 1 down from this years 21.
Hopefully the other females have produced offspring, and conditions are
good in victoria so survival rates are better than average

Andrew

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