1997-06-13_REPORT - M1981302 ‎(15)‎

• Permit No: M1981302
• IBM Index Class Name: Report
• Doc Date: 6/13/1997
• Doc Name: EXHIBIT A 11 STATUS OF MEADOW JUMPING MOUSE FINAL REPORT
• Media Type: D
• Archive: No

grasslands on City of Boulder Open Space, captured and released two meadow
jumping mice an 14 August on the Burke-Gebhard parcel (S of Baseline Road, N of
South Boulder Road, W of Cheryvale Road, and E of South Boulder Creek). This site
of capture is just northeast of our captures on the Gebhard parcel. This is an area of
tallgrass prairie habitat, unmowed but winter-grazed (C. E. Bock, personal
communication).
Table 2 shows numbers of individuals captured by speci. s by week. No species was
captured at all sites. Peromyscus maniculatus (deer mouse) and Microtus
pennsylvanicus(meadow vale) both were captured on 12 of the 13 different sites,
however. Microtus ochrogaster(prairie vole) was taken on 11 of 13 (84.6%) sites, and
Mus musculus (house mouse, an adventive species) was taken on 10 of 13 sites
(76.9% of sites). Reithrodontomys megalolls (western harvest mouse) was captured on
six sites (46.2% of sites), Sorex anereus (masked shrew), Chaetodipus hispidus (hispid
pocket mouse), and Neotoma mexicana (Mexican woodrat) were each taken on two
sites (15.3%) and both Peromyscus nasutus (northern rock mouse) and Rattus
norvegicus (Norway rat, another adventive species) were taken on just one site each
(7.8% of sites).
The number of species per site ranged from three (Gebhard, Kenosha Ponds,
DawsoNDoniphan parcels) to seven (on the Hedgecock-Neuhauser Parcel). Mean
number of species per parcel per week was 4.7.
Table 3 shows percentage of individual small mammals captured by species by week
and site. P. maniculatus was by far the most frequently captured species overall, with
62.8% of all captures. Only two other species, M. pennsylvanicus and M. musculus,
contributed more than 10 percent to total captures. Z. hudsonius accounted for just
1.5% of total captures.
Cruzan (1968) reported captures of Z hudsonius per 1000 trapnights as follows: 17 at
Sawhill Ponds and 11 at the mouth of Lefthand Canyon. Comparable figures for the
present study are 8.3 for the VanVleet Parcel in May, 9.0 on the Gebhard Parcel, and
3.3 for the VanVleet Parcel in September. Further, Cruzan noted that meadow jumping
mice were 17.6 percent of total captures at Sawhill Ponds and 7.1 percent of captures
at the mouth of Lefthand Canyon; by contrast, those figures were 1.5% for VanVleet in
May, 30.0% for Gebhard, and 0.5% for VanVleet in September.
Funding from the USFBWS ended on 15 September. However, the City of Boulder
Open Space and Real Estate Department decided to fund continued trapping of small
mammals at one known locality of Z. hudsonius, the VanVleet Parcel, intending to
determine the time of immergence of the mice into hibernation. The protocol for this .
trapping is detailed in Methods, above. Results of this trapping are shown in Table 4.
Note especially that the last capture of a meadow jumping mouse was on 4 October.
Trap Mortality.—In keeping with the Scientific Collecting License under which this
research was conducted, inadvertent trap casualties have been deposited in the
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