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9/19/2014 State.co.us Executive Branch Mail-RE:TASK-before you leave.FW:St.Vrain&Gravel Mines Follow-up <br /> STATE OF <br /> 40 GOLORADO <br /> RE: TASK-before you leave. FW: St.Wain &Gravel Mines Follow-up <br /> Shafer,Tim<tshafer@bouldercounty.org> Thu,Sep 18,2014 at 5:18 PM <br /> To:"michaela.cunningham@state.co.us"<michaela.cunningham@state.co.us> <br /> Cc:"Spaulding,Susan"<sspaulding@bouldercounty.org>,"DeLeo,Claire"<cdeleo@bouldercounty.org> <br /> Hi Michael, <br /> I am a wildlife biologist with Boulder County Parks&Open Space studying Preble's on county properties. I was asked by Claire Deleo,our Senior Plant Ecologist,to share <br /> with you some information on our findings from the small mammal trapping we did this summer. Below is some general information on Preble's and Preble's <br /> conservation,as well as some maps illustrating occupied habitat at the properties of interest. We caught Preble's on both the Golden-Fredstrom and Western Mobile <br /> properties this summer. While we do have exact locations for our captures,these are very mobile animals and the extent of connected habitat is the scale that is <br /> appropriate for consideration of Preble's conservation. The area of concern is described below: <br /> • Preble's are very mobile rodents and can travel up to 4 km along linear riparian corridors with sufficient suitable habitat. <br /> • Preble's habitat is defined as 100 m outside the 100-year floodplain(USFWS). However,floodplains in Boulder County are wider than those in other areas within <br /> Preble's distribution,so the defined habitat in Boulder County is not considered to exceed 600 ft.from the center of the stream for streams in Boulder County. <br /> • Riparian areas within 1 mile upstream and 1 mile downstream of a known Preble's capture site are considered occupied habitat. (This includes main stem tributaries <br /> and ditches in occupied reaches). This definition is the basis for the designation of Mouse Management Area under the Environmental Resources Element of the Boulder <br /> County Comprehensive Plan,which seeks to guide effective conservation of Preble's habitat in the county. <br /> • Based on the habitat requirements and basic biology of this species,the entire reach of St.Wain Creek on both the Western Mobile and Golden-Fredstrom <br /> properties,as well as the entire reach of the South Branch ditch on the Western Mobile property,are considered occupied Preble's habitat. Preble's were captured on <br /> each of these stream reaches both pre and post flood. <br /> Golden-Fredstrom Property—Fredstrom Resource(M-2001-016) <br /> Trapped the week of 7/14/2014 <br /> Trapped for three nights,(250 traps X three nights=750 trap nights) <br /> Following the U.S.Fish and Wildlife Service survey protocol for trapping Preble's,we trapped approximately 1,200 meters of riparian habitat along the north side of St. <br /> Wain Cr.,spanning almost the entire length of the POS property. <br /> Preble's were captured along St.Wain Creek,with evidence of a breeding population(multiple age classes and reproductive females). <br /> (Per the Environmental Resources Element: Yellow=Mouse Management Area,Purple=Potential Restoration Area,Orange=Possible Linkage Habitat. Green=County <br /> Open Space. Triangles=Transect start locations) <br /> hftps:Hmail.google.com/mail/u/O/?ui=2&ik=3al d83e556&view=pt&search=inbox&msg=1488bOfb2a33b 15c&siml=1488bOfb2a33bl 5c 1/6 <br />