Cambarus bartonii

Plain dark brown coloration with occasional mottling or saddle-shaped marking distinguishes it from some sympatric species. Secondary burrowing habit separates it from primary burrowing cambarids. In southern Appalachia, restricted to mountain and foothill streams, distinguishing it from lowland species. Form I males can be identified by reproductive morphology. Antennules serve chemosensory function in feeding behavior, a trait demonstrable through behavioral observation.

Typically plain dark brown in coloration, though occasional mottling or a saddle-shaped marking may be present. As a secondary burrowing crayfish, it possesses adaptations for both aquatic life and limited burrowing behavior.

Fast-flowing, cool, rocky streams and shallow lakes. Secondary burrowing crayfish capable of constructing limited burrows. Demonstrated ability to use terrestrial microhabitats, specifically decaying logs in forested areas, for overwintering.

Eastern North America: Canadian provinces of Ontario, Quebec, and New Brunswick; United States from Maine to Alabama. In the southern portion of its range, restricted to the Appalachian Mountains and their foothills. Type locality thought to be near Philadelphia, Pennsylvania.

Males of reproductive form (Form I) engage in agonistic contests with three main initiation acts: Lunge, Claws Raised, and Ambivalent Contact. Winners perform significantly more total initiation acts, Lunge, and Claws Raised behaviors than losers. Unlike some congeners, eventual losers show limited submissive behavior and contest intensity does not decline with establishment of dominance hierarchies. Antennules serve critical chemosensory role in feeding behavior integration. Documented behavioral plasticity in habitat use: capable of overwintering in terrestrial microhabitats including decaying wood.

Essential constituent in maintaining freshwater ecosystems. Serves as indicator of groundwater and ecosystem health in applicable contexts.

Listed as Least Concern on IUCN Red List. Listed as Species of Special Concern in Connecticut. Subject of ecological research due to acid tolerance and behavioral studies. First crayfish described from North America, holding historical significance in North American carcinology.

• Cambarus robustusClosely related species with which C. bartonii has been directly compared in agonistic contest studies; differs in contest dynamics including greater role of Lunge behavior and more pronounced submission in losers during intraspecific contests.
• Cambarus bartonii carinirostrisRecognized subspecies (validity under investigation) known as Rock Crawfish; distinguished by geographic separation in northern West Virginia and potentially by morphological features implied by the subspecific epithet.

• crayfish
• freshwater
• Appalachian
• secondary burrower
• acid tolerant
• terrestrial overwintering
• agonistic behavior
• chemosensory
• IUCN Least Concern

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Small, rare crayfish thought extinct is rediscovered
• Observation of a Cambarus bartonii bartonii (Common Crayfish) Overwintering in a Terrestrial Winter Microhabitat
• Life history of Cambarus bartonii carinirostris in northern West Virginia.
• Response of the crayfish Cambarus bartonii bartonii to acid exposure in southern Appalachian streams
• AGONISTIC CONTESTS IN MALE FORM I CAMBARUS BARTONII BARTONII (FABRICIUS, 1798) (DECAPODA, CAMBARIDAE) CRAYFISH AND A COMPARISON WITH CONTESTS OF THE SAME TYPE IN CAMBARUS ROBUSTUS GIRARD, 1852
• Chemosensory Role of Antennules in the Behavioral Integration of Feeding by the Crayfish Cambarus bartonii
• Identification of Microbiota Associated with the Ectosymbiotic Community Structure of the Appalachian Brook Crayfish (Cambarus bartonii)
• CHEMOSENSORY ROLE OF ANTENNULES IN THE BEHAVIORAL INTEGRATION OF FEEDING BY THE CRAYFISH CAMBARUS BARTONII