Vernal Pool Fairy Shrimp _Brachinecta Lynchi_ Vernal Pool Tadpole by gdf57j

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									                              Vernal Pool Fairy Shrimp (Brachinecta Lynchi)                                   Fairy Shrimp
                              Status -- Federal: Threatened; California: None                                                                               The vernal pool fairy shrimp has a life span
                              Vernal Pool Tadpole Shrimp (Lepidurus Packardi)                                                                               from December to early May (if water
                              Status -- Federal: Endangered; California: None                                                                               temperature stays below 75 F).
                                                                                                                                                            The vernal pool tadpole shrimp is more
                                                                           The vernal pool fairy shrimp                                                     temperature-tolerant, and has a life span from
                                                                           and tadpole shrimp are two                                                       December until the vernal pools dry up.
                                                                           species of Crustaceans found in                                                  Food
Photos: Brent Helm, Jones & Stokes Assoc.




                                                                           California’s vernal pools.                                                       Vernal pool fairy shrimp are filter and
                                                                           These unique, seasonal aquatic                                                   suspension feeders. Their diet mainly
                                                                                                                                                            consists of unicellular algae, bacteria, and
                                                                           habitats form when winter rains
                                                                                                                                                            ciliates. They may also scrape algae, diatoms
                                                                           fill shallow depressions. Lined                                                  and protists from the surface of rocks, sticks
                                                                           with impervious clay, the pools                                                  and plant stems.
                                                                           persist for several months, then                                                 Vernal pool tadpole shrimp are predators.
                                                                           gradually evaporate during          Map from Fairy Shrimps of California’s       They feed on other invertebrates in the pools
                                            Vernal Pool Fairy Shrimp
                                                                           spring.                             Pools, Puddles and Playas by D. Belk & C. H. and amphibian eggs. They may also eat some
                                                                                                               Ericksen, used with permission.
                                  Vernal pool shrimp are                                                                                                    vegetation.
                                  generally 1 - 1.5 inches                                                    Reproduction Shrimp eggs are laid by the adults each winter season.
                                  long.                                                                       However, eggs may lie dormant in the soil for up to ten years before hatching.
                                                                                                              Genetic diversity is important for the survival of any species. One pool’s
                                  Fairy shrimp are usually
                                                                                                              shrimp population may have genes another pool’s population lacks. This
                                  translucent, while                                                          diversity may mean that the first population survives a disease or other threat,
                                  tadpole shrimp are a                                                        which kills the population that doesn’t have the needed gene. The genes of
                                  light to dark brown.                                                        different shrimp populations can be mixed when eggs are moved from one pool
                                  As dictated by their                                                        to another via wind, water, or in the stomachs of migrating birds. Small,
                                  ephemeral habitat, fairy                                                    isolated populations of shrimp are more likely to go extinct because they lack
                                  shrimp have short life                                                      the genetic diversity to withstand threats
                                                                       Vernal Pool Tadpole Shrimp             Distribution
                                  spans.
                                                                                                              The vernal pool fairy shrimp is found scattered throughout the Central Valley
                                                                                                              from Shasta County to Tulare County, along the Coast Range from Solano
                                                 California Department of Pesticide Regulation                County to San Luis Obispo and Santa Barbara Counties, and in southern
                                                          Endangered Species Project                          California in Riverside and San Diego Counties. The vernal pool tadpole
www.cdpr.ca.gov                                                                                               shrimp is found in the Central Valley from Shasta County to Merced County.

								
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