DISTRIBUTION AND STATUS OF CRAYFISHES IN THE PIT RIVER DRAINAGE, CALIFORNIA BY ROBERT A. DANIELS Department of Wildlife and Fisheries Biology, University of California, Davis, Ca. 95616, U.S.A. INTRODUCTION Not since the work of Riegel ( 1959) has a survey of the distribution of Cali- fornia crayfishes been undertaken. Since then, range extensions, local extinctions and the introduction of exotic forms into new areas have undoubtedly altered statewide distributional patterns. Unfortunately, many of these changes remain unrecorded. With the current increased interest in endemic, especially threatened or endangered, species, the need for information on species range and abundance has become apparent. One such species is the placid crayfish, Pacifasfac1/s fortis, (Faxon), the only extant, endemic crayfish in California south of the Klamath River drainage (Riegel, 1959). This species inhabits the middle reaches of the Pit River system of northeastern California, a distinct subdrainage of the Sacramento River system. Two exotic forms, 01'conecteJ virilis (Hagen) and Paci f a.rtacu.r leniu.rculu.r (Dana), also occur in the drainage. In order to determine the extent of the ranges of the three crayfish species, to estimate their abundance and to describe their habitat, I conducted a stream survey of the drainage in 1978.
Crustaceana – Brill
Published: Jan 1, 1980
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