consumers

Arthropod Pitfall Traps-III in 5x1 grid at LTER II NPP sites

Study number: 

8

Data set ID: 

2100008001

Original investigator: 

John Anderson

Abstract: 

Objectives. Desertification is hypothesized to have
altered the spatial and temporal availability of resources
required by the biota. Results of desertification on the
Jornada include changes to shrub dominated communities and
major soil changes. We hypothesize that these shifts in
vegetation have changed resources temporally for many of the

Objectives. Desertification is hypothesized to have
altered the spatial and temporal availability of resources
required by the biota. Results of desertification on the
Jornada include changes to shrub dominated communities and
major soil changes. We hypothesize that these shifts in
vegetation have changed resources temporally for many of the
consumers. If grassland systems respond to rainfall without
significant lags, but shrub systems do not, then consumer
species should reflect these differences. In addition,
shifts from grassland to shrubland results in greater
structural heterogeneity of the habitats. We have
hypothesized that consumer populations, diversity, and
densities of some consumers will be higher in grasslands
than in shrublands. Diversity and/or densities are
hypothesized to be related to the NPP of the sites. Data
will be collected for the duration of the LTER program in
order to provide data to test these hypotheses.
Data for arthropods captured in pitfall traps on LTER
III consumer plots at 2 month intervals. Data includes
order, family, genus, species, and number.

Termite bait data

Study number: 

10

Data set ID: 

2100010001

Date range: 

1989-03-15 to 2000-01-14

Original investigator: 

Walter G Whitford

Data contact: 

Abstract: 

Data for Jornada LTERII termite bait weight loss. Toilet paper roll termite baits are placed on grids on each consumer plot. Data include initial bait weights and bait weights after baits have been retrieved from the field once each year. Weight loss is calculated as a measure of termite foraging activity.

Data for Jornada LTERII termite bait weight loss. Toilet paper roll termite baits are placed on grids on each consumer plot. Data include initial bait weights and bait weights after baits have been retrieved from the field once each year. Weight loss is calculated as a measure of termite foraging activity.

Small mammal trapping (LTER-II)

Study number: 

5

Data set ID: 

210005001

Original investigator: 

John Anderson

Abstract: 

Small mammal live-traps are located on consumer pitfall plots. A grid of 20 traps is located on each consumer plot. Small mammals are trapped daily for a one-week period in the late spring and again in the late summer of each year. Data on species, sex, toe marks, weight, and reproductive condition are taken.

Pitfall trap grids have been installed at three creosotebush sites, three grassland sites, three mesquite sites, and two tarbush sites. Jornada LTER II consumer plots during this period were located at T-WEST, T- EAST, M-RABB (2 grids), M-WELL, G-IBPE (2 grids), G-BASN, C-SAND (2 grids), and C-CALI sites.

Data download: 

Ammonia volatilization from Chihuahuan Desert habitats - 1988

Study number: 

393

Data set ID: 

210393001

Original investigator: 

William H Schlesinger

Data contact: 

Abstract: 

Ammonia volatilization was measured at three sites in the Chihuahuan Desert of southern New Mexico, U.S.A. In dry soils, ammonia volatilization ranged from 9 to 11 micrograms of nitrogen per square meter per day, but rates increased to 95 micrograms of nitrogen per square meter per day in a shrubland site after an experimental addition of water.

Ammonia volatilization also increased with experimental additions of NH4Cl and decreased with additions of sucrose. Competition by nitrifiers for available NH4+ had little effect on NH3 volatilization: N-Serve, added to inhibit nitrification, decreased NH3 volatilization in a grassland site and had little effect at other sites. We suggest that NH3 volatilization is controlled by the rate of mineralization of NH4+ from soil organic matter, and mineralization is stimulated by rainfall. Overall rates of NH3 volatilization from undisturbed desert ecosystems appear to be much lower than those reported for rangeland and agricultural soils.

The data set shows ammonia volatilization from grassland, cresotebush, and playa habitats in response to a variety of experimental treatments chosen to elucidate the processes controlling the volatilization under dry and post-rainfall conditions. Ammonia is collected in weak acid in scintillation vials placed inside PVC chambers in the field. The rate of ammonia volatilized per unit area ugN/m2/day) is found by mulitplying the concentration in the acid by 1250 to account for volume and area corrections.

Data download: 

Arthropod Pitfall Traps-II in 4x4 grid at LTER II NPP sites

Study number: 

8

Data set ID: 

2100008002

Original investigator: 

John Anderson

Abstract: 

Data for arthropods captured in pitfall traps on LTER II
consumer plots. Data includes order, family, genus,
species, and number.

Data for arthropods captured in pitfall traps on LTER II
consumer plots. Data includes order, family, genus,
species, and number.

Animal Transect Data

Study number: 

9

Data set ID: 

2100009001

Original investigator: 

David Lightfoot

Data contact: 

Abstract: 

Data for rabbits, birds, and lizards recorded from the LTER II animal transects. Data consists of species names, numbers of individuals, and distances observed from transects. Data is collected from each transect once every two weeks. See history file for exceptions.

Data for rabbits, birds, and lizards recorded from the LTER II animal transects. Data consists of species names, numbers of individuals, and distances observed from transects. Data is collected from each transect once every two weeks. See history file for exceptions.

Data download: 

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