>I am on a newly-formed committee of the Seattle Astronomical Society to work
>for dark skies. While this is obviously of critical interest to amateur
>astronomers, there are also wildlife issues involved.

There are human health issues involved, too. Melatonin production is
affected by surprisingly small amounts of light at night, and this affects
(amongst other things) sleep quality and phase, which in turn affects
concentration (driving ability!), productiveness, depression, general
health. Night-lights in kids' rooms at night have recently been shown to
lead to later nearsightedness.

Night lighting is also a possible issue for habitat in general--many plants
depend on day length to determine when they bloom and fruit, and even small
shifts in the timing might then affect pollinator availability, berry/seed
supplies for migration, and such. It affects many nocturnal insects such
as moths, which are important food sources for bats, birds, and other
critters (though some bats have taken advantage of moths coming to street
lamps as a food concentrator...)

--
Allyn Weaks allyn at tardigrade.net
Seattle, WA Sunset zone 5
Pacific NW Native Wildlife Gardening: http://www.tardigrade.org/natives/