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nightjars

To: Birding-Aus Mail <>
Subject: nightjars
From: (Richard Johnson)
Date: Wed, 02 Aug 2000 17:55:41 +1000
Hi birders

Damn, I hate the way addresses sometimes fall off emails! Please see the
rest...

Hi, Nightjar Fans

There was a bit of a thread on this topic going a while back. I think
Bill Jolly and I
agreed that as far as we could tell, WTNJ's are spring-summer breeding
visitors but
absent in winter from the Lockyer Valley, 100km W of Brisbane, in
winter. The
recent records from coastal or near-coastal SEQ suggest that a similar
pattern to
that in north coastal NSW, as described by Allan, may be applicable to
SEQ. That
is, an all-year-round population in the warmer and wetter coastal areas,
but a
migrant population in the seasonally drier and cooler west. By way of
comparison,
Brisbane has an annual rainfall somewhere around 1100mm/yr and rarely
sees frost
in winter. The Lockyer average rainfall is around 700-750mm/yr and
regularly gets
severe frosts in winter. These differing climatic conditions probably
have a profound
effect on seasonal availability of flying insects (WTNJ food) which
would influence
whether birds could persist in an area or not.

Richard

--
+----------------------------------------+
Richard Johnson
Roma District
Tel: (07) 4622 4266  Fax: (07) 46 22 4151
E-mail: 



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