01744nas a2200205 4500008004100000245005700041210005700098300001100155490000600166520113700172653001301309653001701322653002301339653002501362653002601387100002001413700001701433700001801450856007001468 2001 eng d00aOrconectes neglectus is Established in the Northeast0 aOrconectes neglectus is Established in the Northeast a93-1000 v83 a

Orconectes neglectus, a crayfish native to the Mississippi River drainage in Arkansas, Oklahoma, Missouri, and Kansas, is reported from streams in southeastern New York for the first time. This species is the newest component of a crayfish fauna that is increasingly dominated by introduced species. Individuals of this species were collected in 1997–1999. First and second form males and females ranged in size from 7.5–40.9 mm carapace length. Ovigerous females were collected in May 1999. These data demonstrate that this species is established and reproducing in clear, rubble-bottom streams in southeastern New York. O. neglectus is readily identifiable by its distinctive coloration and color pattern; other characteristics of the rostrum, mandible, gonopod and annulus ventralis also are useful in distinguishing it from other species inhabiting northeastern North America. Currently, O. neglectus is known in the northeastern United States only from tributaries of the upper Croton River of the lower Hudson River drainage. We assume that it was introduced into the area accidentally.

10acrayfish10aHudson River10aintroduced species10aOrconectes neglectus10asoutheastern New York1 aDaniels, R., A.1 aMurphy, D.C.1 aKlemens, M.W. uhttp://dx.doi.org/10.1656/1092-6194(2001)008[0093:ONIEIT]2.0.CO;201468nas a2200169 4500008004100000245011700041210006900158300001200227490000600239520094800245653001301193653001401206653001201220653001101232100002001243856003501263 1998 eng d00aChanges in the Distribution of Stream-Dwelling Crayfishes in the Schoharie Creek System, Eastern New York State.0 aChanges in the Distribution of StreamDwelling Crayfishes in the  a231-2480 v53 a

Changes in the distribution of crayfishes in the Schoharie Creek drainage, eastern New York State, are assessed, based on historical records and surveys conducted in 1982-83 and 1996. The native crayfish assemblage in this region probably consisted of only three species: Cambarus bartonii, C. robustus, and Orconectes propinquus. In 1982-83, six crayfishes (C bartonii, C. robustus, O. immunis, O. obscurus, O. propinquus, and O. rusticus) were collected in the drainage. In 1996, all the crayfishes except O. obscurus were found again, and an additional species (O. virilis) was captured at one site. Between the two survey periods, O. rusticus markedly expanded its range, while the range of O. propinquus decreased and the relative abundance of other species declined. The habitat use of each species is examined.

10acrayfish10aexpansion10ahabitat10asurvey1 aDaniels, R., A. uhttp://doi.org/10.2307/3858623