The Kentucky cave shrimp (''Palaemonias ganteri'') is an eyeless,

troglobite A troglobite (or, formally, troglobiont) is an animal species, or population of a species, strictly bound to underground habitats, such as caves. These are separate from species that mainly live in above-ground habitats but are also able to live u ...

shrimp Shrimp are crustaceans (a form of shellfish) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata of the decapod order, although some crustaceans outside of this order are refer ...

. It lives in

cave A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea ...

s in

Barren County Barren County is a county located in the south-central portion of the U.S. state of Kentucky. As of the 2020 census, the population was 44,485. Its county seat is Glasgow. The county was founded on December 20, 1798, from parts of Warren and G ...

, Edmonson County, Hart County and

Warren County Warren County is the name of fourteen counties in the USA. Some are named after General Joseph Warren, who was killed in the Battle of Bunker Hill in the American Revolutionary War: * Warren County, Georgia * Warren County, Illinois * Warren County ...

Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virginia to ...

. The shrimp's shell has no

pigment A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compo ...

; the species is nearly transparent and closely resembles its nearest relative, the

Alabama cave shrimp The Alabama cave shrimp (''Palaemonias alabamae'') is a species of shrimp in the family Atyidae, found only in caves in the state of Alabama. Conservation status ''Palaemonias alabamae'' is listed as an endangered species both on the IUCN Red ...

. The habitat of the Kentucky cave shrimp is exclusively in underground streams of caves. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

Mammoth Cave National Park Mammoth Cave National Park is an American national park in west-central Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper Sout ...

region of central Kentucky. The shrimp feeds mainly on

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...

s that are washed into the cave by the movement of

groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidate ...

Conservation

The Kentucky cave shrimp was registered as an

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...

under the

Endangered Species Act The Endangered Species Act of 1973 (ESA or "The Act"; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of ec ...

in 1983, and was included on the

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...

as Endangered in 1994. There are currently only several thousand remaining. It is mostly threatened by

contaminated groundwater Groundwater pollution (also called groundwater contamination) occurs when pollutants are released to the ground and make their way into groundwater. This type of water pollution can also occur naturally due to the presence of a minor and unwanted ...

running into its habitat. Several nearby communities either have inadequate

sewage treatment Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable for discharge to the surrounding envir ...

facilities or lack such facilities altogether. An additional potential threat is the entry of contaminants from traffic accidents and roadside businesses. One incident in 1979 caused the death of aquatic cave organisms in a part of the

Mammoth Cave Mammoth Cave National Park is an American national park in west-central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world. Since the 1972 unification of Mammoth Cave with the even-longer system under F ...

system, and in a 1980 incident, a truck carrying toxic

cyanide Cyanide is a naturally occurring, rapidly acting, toxic chemical that can exist in many different forms. In chemistry, a cyanide () is a chemical compound that contains a functional group. This group, known as the cyano group, consists of ...

salts overturned on

Interstate 65 Interstate 65 (I-65) is a major north–south Interstate Highway in the central United States. As with most primary Interstates ending in 5, it is a major crosscountry, north–south route, connecting between the Great Lakes and the Gulf ...

, just south of

. A recovery plan is underway which includes: # Surveying the location and extent of all areas supporting shrimp # Conducting life history and other research required to determine what constitutes a viable population # Monitoring population status # Maintaining adequate water quality; # Protecting the shrimp from introduced predators # Producing and conducting public education programs.

References

{{Taxonbar, from=Q2715402 Atyidae Crustaceans of the United States Cave shrimp Endemic fauna of Kentucky Freshwater crustaceans of North America Mammoth Cave National Park Crustaceans described in 1901 Taxa named by William Perry Hay ESA endangered species