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At one nanosecond after the big bang - the earth was a mass of hot gas 
and nuclear debris. If that time is chosen - nothing on earth is native.

How long does a species have to disappear that when it returns it is not 
longer native or "invasive?" At what instant in time did we stop the 
clock and declare - this is what the world looked like and any changes 
will be considered non-native?

The whole question of native and non-native gets wrapped around the axle 
because in most respect the designation of native is somewhat arbitrary 
and in some cases arbitrary and capricious.

Eco systems evolve - they respond to different stimuli and unbalanced 
external just like any system. These forces change over time - ice age 
to global warming. If the predictions are true and I expect that have a 
high probability of being accurate - what happens when the polar bear 
disappears from a large portion of its current habitat maybe find some 
refuge in some isolated corner of the earth. Then when the next ice age 
comes is the polar bear native or non native to it's current location?

Truman




Smith, Dave wrote:
> horse a feral animal. It is a North American native, as is the elk, 
> mule deer, or pronghorn. To draw a parallel, the great tribes of the 
> plains no longer hunt bison. In fact, without such hunters there is no 
> known shaping predator of bison (perhaps it was the huge maned North 
> American Lion) .


--

“Since when have we Americans been expected to bow submissively to 
authority and speak with awe and reverence to those who represent us?” 
Justice William O. Douglas


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