Vernal (or ephemeral) pools are temporary bodies of water usually filled with winter rain or snow melt.  They are called vernal pools because they are often, but not necessarily, at their peak depth in the spring (“vernal” meaning of, relating to, or occurring in the spring) – their water level will fluctuate with a normal dry period.  One of the most important parts to the pool is the underlying or hydric layer that allows for the base retention of water.  Amphibians migrate from their winter spots upland down to the safety of the pool (usually there are no fish as predators), where breeding happens.  Each vernal pool holds its own unique chemistry and attractions. There is a special curiosity for me in these waters, the secrets that are created in this temporary wetland.

Check out the California Chaparral Institute’s page on Vernal Pools. LINK