The Nature Conservancy has an interesting article about Pupfish on their blog. Having been to Ash Meadows and seeing the pupfish, I love hearing and learning about this unique fish! See an exert below and check out the whole article on the Nature Conservancy's blog, linked below.
"Pupfish are killifish — small, knuckle-sized fish found on three continents. They’re known for surviving harsh environments. Once, pupfish in the Southwest probably consisted of only one species.
As the climate became hotter, the lakes and rivers began drying up, leaving only isolated springs, pools and rivers.
The pupfish became isolated in these little pockets of remaining water. Essentially desert springs became habitat islands".
- See more at: http://blog.nature.org/science/2014/04/30/pupfish-mojave-desert-ash-meadows-endemic-fish/#sthash.08EX1CWk.dpuf
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