Why shouldn't we protect our fishing streams or mountain lakes, historic houses or ancestral dwellings?
Colorado begins in the southern deserts around Mesa Verde national park ancestral home to the cliff-dwelling Anasazi, and climbs quickly into the soaring Rockies.
Breeding studies in the 1940s led to the discovery of viable hybrid offspring resulting from crosses between the (derived) blind cave-dwelling forms and (ancestral) surface-dwelling forms from the same geographical region of northeast Mexico (Breder 1943a, b).
This more recent invasion was established from a wave of ancestral surface-dwelling fish that are closely related to the surface-dwelling forms found in the region today.
from the Kennedy ancestral home, in Dunganstown.
When I reached few of the stone structures along a natural wall, they seemed more like the most humble ancestral Pueblo dwellings in the southwestern U.S. than anything I would imagine in Europe.
One of the earliest questions relates to the number of times the El Abra limestone caves of northeastern Mexico were colonized by ancestral surface-dwelling forms [ 4, 5].
The consensus view, based on several recent studies, is that cave forms originated from at least two distinct ancestral surface-dwelling stocks over the past several million years.
This population analysis agrees with prior reports suggesting cave populations originated from two ('old' and 'new') waves of ancestral surface-dwelling forms [ 7, 9- 11, 21, 23]).
The authors argued that these cave forms were established by an ancestral surface-dwelling form that is either extinct, or no longer present in this region of Mexico [ 7].
A. mexicanus comprises an extant ancestral-type surface dwelling morph and at least five independently evolved cave populations.
