Re: birding-aus Black naped Terns nesting.

To:
Subject:	Re: birding-aus Black naped Terns nesting.
From:	RUSSELL DEAN WOODFORD <>
Date:	Tue, 6 Apr 1999 11:45:40 +1000 (EST)

> Well of course if the gulls did get one out of every ten chicks, then they
> would have decimated them, literally. Decimation is not devastation,
> decimation is a rather trivial event in natural populations, unless it is
> done repeatedly. All other factors remaining equal, decimation needs to
> occur 7 times to halve the population i.e. 100%, 90%, 81%, 72.9%, 65.6%,
> 59%, 53.1%, 47.8%.)

Not really related to the original message, but, given Philip Veerman's
interesting figures above, does anyone know if the gulls' 'success rate'
would increase from 10% as the tern population decreased?

Russell Woodford



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