>>However limited morphometric analysis indicate that the
>>Hoover Dam Refugium population now exhibits an overall
>>increase in body size and possibility some change in body
>>proportions when compared to the original Devils Hole
>>population. Apparently, there is no substitute for the
>>environment provided by Devils Hole."
An alternative explanation is genetic drift. The refugium population is so
small that this might be more likely than any sort of adaptive selection.
I'm surprised that they don't remove a small number of fish from Devil's
Hole every year when they are at peak population size, to provide a source
of new Devil's Hole genes...
cheers,
Dave
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