It’s not surprising that other vertebrate groups, such as reptiles and amphibians, are absent from glaciers, since they’re cold-blooded and could not survive long exposure to such low temperatures.
The most common order of birds in these habitats is the passerines, or songbirds. However, other groups are represented. The golden eagle is a member of the falcon order, and the common raven, like crows, jays and their relatives, is a corvid. Several species of ptarmigan represent the gallinaceous birds, a group which includes chickens, turkeys, partridges, pheasants, quail and grouse.
One bird species, the white-winged diuca finch, constructs its nest on the surface of glaciers in the Andes; it has been systematically studied on Quelccaya Glacier in Peru.
The mammals are more diverse, both in terms of taxonomy and behavior. Most common are the ungulates such as bison, musk ox, elk, reindeer, mountain goat, ibex, chamois and bighorn sheep, who come for relief from the heat; as large animals covered with fur and hair, they have difficulty cooling off during hot periods, and either lie directly on the ice, or rest in the cold air that drains off glaciers.
Wolverines have also been seen caching their prey on glaciers; the author suggests that this behavior may provide lactating females with critical components of their diet during the period when they are nursing their cubs.
In the meantime, Rosvold’s website, Frozen Fauna, provides a variety of information about the mammals and birds which inhabit, or at least regularly visit, glaciers, as well as about thearchaeology of the hunters and herders who have also inhabited these zones for many centuries.
No comments:
Post a Comment