Bruneau hot springsnail (Pyrgulopsis bruneauensis) 2013 range-wide surveys

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In November 2013, U. S. Fish and Wildlife biologists conducted the annual monitoring effort for the presence of hot springs and Bruneau springsnails within the designated recovery area of that species. The total number of springs recorded in 2013 declined from 127 in 2012 to 118 (7%). The number of occupied springs declined by three, with mean and low-density springs remaining little changed and only two springs having high densities (as with 2012). The 2013 river flows in the Bruneau were similarly low as 2012, and the number of occupied springs with low and medium densities were relatively unchanged between years. There were nine fewer springs total, and while some of this may be due to observer bias, some of the small bedrock springs in the Upper West reach were no larger than seeps and hence no longer counted as “springs.” Biologists recorded an over-all increase in the discharge of 2 of the 3 monitored springs. While this increase is promising, suggesting that springs are not so rapidly declining as previously thought, it cautions that numerous years of data should be considered before suggesting trends in spring discharges.

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ELECTRONIC FILE - Zoology: Invertebrates

NOTE: DOCUMENT CONTAINS SENSITIVE INFORMATION

SWAP (2/19/2016) citation:
Hopper D, Burak G, Hardy N. 2014. Bruneau hot springsnail (Pyrgulopsis bruneauensis) 2013 range-wide surveys. Internal status report. Boise (ID): US Fish and Wildlife Service, Idaho Fish and Wildlife Office. 21 p