Here's all I could find for you that would be of any use.

1) http://www.fishdoc.co.uk/water/ammonia.htm
This one talks about ammonia, and exactly what it causes when the levels are too high. It also has a table that shows a relationship between pH, ammonia level and temperature.

2) Basically this is the relevant part from what I found on about.com: "Ammonia becomes increasingly toxic as the pH rises above 7.0."

You can see how ammonia, nitrite and nitrite interact if you know about the inter-workings of the cycling process.

I hope this helps. If you want more information, please let me know and I will promote your post to draw attention to your post.

I know one thing about pH off the top of my head... as temperature decreases pH increases and as temperature increases pH decreases.
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Phishie
Site Coordinator

"An ounce of prevention is worth a pound of cure."