Vernal pool fairy shrimp require vernal pools or similar, ephemeral pools to complete their life cycle. They prefer small pools with cold water. Prior to seasonal drying of the pools, females produce eggs ("cysts"). These cysts can dry out and lie dormant until pool re-filling occurs, at which time the eggs will hatch.
Limiting factors
There is little genetic variability within vernal pool fairy shrimp populations. Many vernal pools have been drained or have modified hydrology unsuitable for fairy shrimp. Remaining pool habitat is increasingly isolated. Stormwater run-off containing pesticides, chemical residues, and other contaminants are also harmful to vernal pool fairy shrimp.
Data gaps
Evaluate genetics. Investigate mechanics of cyst dispersal.
Conservation actions
Maintain or restore vernal pools to provide habitat. Maintain or restore water quality in vernal pools.
