migrant arrival dates.

[L&L Knight <>]

I'm no expert Andy, but the timing in bird migration is linked to the  
build-up of the food supply in the breeding area (flowering, insect  
hatching etc) as well as weather conditions during the take-off period  
(birds tend to leave when the weather conditions are favourable - eg  
stable atmosphere, tail wind etc).
Climate change affects both of these factors.

Regards, Laurie.


On 03/10/2008, at 10:00 AM, Andy Burton wrote:

> There seems to be a general acceptance in the Aust / NZ birding  
> world that global warming causes migrant  birds to arrive earlier.
> Why don't migrant birds arrive later?
>
> Any ideas?
>
> Andy
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