Ecotone Rodent Trapping 1st Capture

Study number: 

262

Data set ID: 

210262008

Data Access: 

Unrestricted

Dataset status: 

Date range: 

2004-07-13 to 2014-10-24

Original investigator: 

Brandon Bestelmeyer

Data contact: 

Abstract: 

   OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation translate into


   pulses of plant above ground net primary productivity (NPP) and how the small mammal community
   responds to such changes also in relation to shrub gradient across the landscape.  Particularly
   we are interested in how the energy flows through the ecosystem in response to pulses of rain,
   how the small mammal community partition resources (in terms of C3 (forbs and shrubs) and C4
   (grasses) plants) and how the genetic structure of some species (i.e.:  Dipodomys spp.) is
   affected by their population dynamics.

   HYPOTHESES:
   1) Small mammal abundance should respond positively to precipitation and NPP.
   2) On a temporal scale, the small mammal energy use should show parallel fluxes along the shrub
      gradient.
   3) The small mammal community should consume C3 and C4 plants according to their availability (or
      NPP).
   4) At low population density, dispersal should be limited and the genetic variance will be
      distributed among populations rather than within (i.e., Fst will trend towards higher values).
      After pulses of rain and NPP, population densities will be greater, dispersal prevalent, and
      the genetic variance of populations will be distributed within populations (i.e., Fst will
      approach zero) as dispersal homogenizes populations.

   Variables include rodent species, sex, reproductive status, weight, and maturity status were recorded.

Data download: 

Description: 

CSV data file for the Jornada dataset: Ecotone Rodent Trapping 1st Capture

CSV data file for the Jornada dataset: Ecotone Rodent Trapping 1st Capture

Methods: 

Digital voice recorders and data sheets

At each site, three rectangular trapping grids (300m X 100m, 16 X 6 traps, 20m apart) were permanently marked in each of the three habitat types characterizing the ecotone (shrubland, grassland, and the transition zone between them) where small mammal trapping took place. Trapping occurred for 4 consecutive nights using Sherman-type live traps (one at each station) baited with a seed mix. Traps were checked every morning and rodents were uniquely marked with ear tags or individual colored numbers with permanent markers and released unharmed at the point of capture. Color blue was used for the first night, Black on the second night and Red on the third night. On the last night new individuals were not marked but recorded as new.

Quality assurance: 

QA/QC: Visual verification Preliminary treatment of data: N/A

Additional information: 

The 3 sites are located in JER Pastures 9, 12 and in CDRRC Pastures 3.

Maintenance: 

annually

Date Data Last Updated: 

2014-10-24

Long-term dataset: 

Signature dataset: 

LTER Core Area(s): 

Data category: 

Research Area: 

Research Network: