Jornada Basin LTER Research

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Displaying 1 - 25 of 44 Datasets


File description including attribute definitions: data_JornadaStudy_370_grasshopper_plot_vegetation, File description including attribute definitions: Plant Species Codes
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370002
Abstract:

This data on annual herbaceous plants was measured on Jornada grasshopper study plots located on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200m south of the LTER transect. Two additional sets of three plots were located 5km and 10km south of the LTER transect. Each plot was composed of two 50m belt transects, each divided into ten 5m2 quadrats. Annual plants were measured in the NE 1m2 of each quadrat, once in May, July and September in 1983, 1984 and 1985. All individuals of each species were counted and measured. A mean diameter, height, and the total number of individuals/1m2/quadrat were recorded. This study is complete.




File description including attribute definitions: data_JornadaStudy_370_grasshopper_plot_vegetation, File description including attribute definitions: Plant Species Codes
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370002
Abstract:

This data on annual herbaceous plants was measured on Jornada grasshopper study plots located on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200m south of the LTER transect. Two additional sets of three plots were located 5km and 10km south of the LTER transect. Each plot was composed of two 50m belt transects, each divided into ten 5m2 quadrats. Annual plants were measured in the NE 1m2 of each quadrat, once in May, July and September in 1983, 1984 and 1985. All individuals of each species were counted and measured. A mean diameter, height, and the total number of individuals/1m2/quadrat were recorded. This study is complete.




Download data: File anmltran.dat
File description including attribute definitions: data_JornadaStudy_009_npp_animal_transects
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1989 - 1994
Dataset ID: 210009001
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.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_soil_nutrient
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368002
Abstract:

The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains chemical analyses for soil samples collected from five ant nests for each of the three sites for total nitrogen, (ammonium, nitrate), inorganic phosphorus, and exchangeable cations (K+, Na+, Ca2+ and Mg2+). Also included is below ground biomass from five ant nests for each of the three sites.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_organic_matter
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368003
Abstract:

The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains % organic matter of soils sampled in January 1987 from ant nests and adjacent reference sites.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_soil_water_content
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368004
Abstract:

The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains soil water content data measured gravimetrically at monthly intervals from January to May. Soil samples were taken from ant nest edge and from adjacent reference sites (5 m apart).




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1995_2001
Original investigator: David Lightfoot
Duration: 1996 - 2001
Dataset ID: 210008001
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 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 for arthropods captured in pitfall traps on LTER III consumer plots at 2 month intervals. Data includes order, family, genus, species, and number. This data collection has been completed.




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1988_1994
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Dataset ID: 210008002
Abstract:

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




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1988_1994
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Dataset ID: 210008002
Abstract:

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




Download data: File ltrophic.dat
File description including attribute definitions: data_JornadaStudy_369_larrea_arthropod_trophic_composition
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1986 - 1986
Dataset ID: 210369001
Abstract:

*We conducted a field study to test the hypothesis that creosotebush (Larrea tridentata) shrubs growing in naturally nutrient-rich sites had better quality foliage and supported greater populations of foliage arthropods than shrubs growing in nutrient-poor sites. This is data for foliage arthropods sampled from LVAR creosotebush shrubs. Sampling was done in April of 1985 and 1986. Shrubs were sampled from 5 separate sites designated A-E. 10 shrubs of 3 different types, R=random, H=high quality, L=low quality were sampled at each site. Total numbers of taxa and individuals of each major trophic group, herbivores, predators, omnivores, from each of the 30 shrubs/site are listed.




File description including attribute definitions: data_JornadaStudy_086_smes_cryptogam_crust
Original investigator: David Lightfoot
Data contact: Robert L Schooley
Duration: 1995 - 2005
Dataset ID: 210086003
Abstract:

A creosotebush shrub study site and a black grama grassland study site have been established at each of the Sevilleta, Jornada and Mapimi research locations. Each study site is 1 km by 0.5 km in area. Three replicate experimental blocks of plots are randomly located at each study site to measure vegetation responses to the exclusion of small mammals, including rodents and lagomorphs. This dataset is for the Jornada Experimental Range, which also contains a cattle exclosure.  A grid of 36 sampling points are positioned at 5.8-meter intervals on a systematically located 6 by 6 point grid within each plot. A permanent one-meter by one-meter vegetation measurement quadrat is located at each of the 36 points. The percent of a quad covered in cryptograms was estimated by determining the percent of each 10 cm square within a quad containing cryptogams (See methods for a detailed explanation). Cryptogams include lichens, algae, and moss. This study is complete.




File description including attribute definitions: data_JornadaStudy_086_smes_cryptogam_crust
Original investigator: David Lightfoot
Data contact: Robert L Schooley
Duration: 1995 - 2005
Dataset ID: 210086003
Abstract:

A creosotebush shrub study site and a black grama grassland study site have been established at each of the Sevilleta, Jornada and Mapimi research locations. Each study site is 1 km by 0.5 km in area. Three replicate experimental blocks of plots are randomly located at each study site to measure vegetation responses to the exclusion of small mammals, including rodents and lagomorphs. This dataset is for the Jornada Experimental Range, which also contains a cattle exclosure.  A grid of 36 sampling points are positioned at 5.8-meter intervals on a systematically located 6 by 6 point grid within each plot. A permanent one-meter by one-meter vegetation measurement quadrat is located at each of the 36 points. The percent of a quad covered in cryptograms was estimated by determining the percent of each 10 cm square within a quad containing cryptogams (See methods for a detailed explanation). Cryptogams include lichens, algae, and moss. This study is complete.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_density_cover_winter_annual
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368001
Abstract:

The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains density and cover of all winter annual plants measured at regular intervals. Density is expressed as the number of individuals of a species per square meter. The cover of each species was calculated as the area covered by a perpendicular (not vertical) projection of its aerial parts onto the ground surface and expressed in covered area (cm squared) per square meter.




File description including attribute definitions: data_Jornada_262010_ecotone_rodent_metrics_1st_capture
Original investigator: Brandon Bestelmeyer
Data contact: Robert L Schooley
Duration: 2004 - ongoing
Dataset ID: 210262010
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.

   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.

   Variables measured:  Rodent abundance expressed as Minimum Number Known Alive (MNKA),
                        rodent biomas, rodent energy, and rodent species richness.




File description including attribute definitions: data_Jornada_262008_ecotone_rodent_1st_capture
Original investigator: Brandon Bestelmeyer
Data contact: Robert L Schooley
Duration: 2004 - ongoing
Dataset ID: 210262008
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... more




File description including attribute definitions: data_JornadaStudy_385_fluff_grass_mesocosm_mites_nematodes
Original investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Dataset ID: 210385001
Abstract:

A mesocosm experiment was conducted on fluff grass (Erioneuron pulchellum) plants to look at the effect of exclusion of mites (with chlordane), nematodes (NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen.




Download data: File lvarthr.dat
File description including attribute definitions: data_JornadaStudy_369_larrea_arthropod_species_composition_lvar
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1985 - 1986
Dataset ID: 210369002
Abstract:

*We conducted a field study to test the hypothesis that creosotebush (Larrea tridentata) shrubs growing in naturally nutrient-rich sites had better quality foliage and supported greater populations of foliage arthropods than shrubs growing in nutrient-poor sites. This is data for foliage arthropods sampled from Lm LVAR creosotebush shrubs. Sampling was done in April of 1985 and 1986. Shrubs were sampled from 5 separate sites, designated A-E. 10 shrubs of 3 different selected types, random = R, high quality = H, low quality = L, were sampled at each site. Total numbers of individuals of each of the common species of foliage arthropods from each of the 30 shrubs/site are listed.




File description including attribute definitions: data_JornadaStudy_370_grasshopper_visual_sampling, File description including attribute definitions: Plant species list, File description including attribute definitions: Grasshopper species list
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370001
Abstract:

This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.




File description including attribute definitions: data_JornadaStudy_370_grasshopper_visual_sampling, File description including attribute definitions: Plant species list, File description including attribute definitions: Grasshopper species list
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370001
Abstract:

This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.




File description including attribute definitions: data_JornadaStudy_370_grasshopper_visual_sampling, File description including attribute definitions: Plant species list, File description including attribute definitions: Grasshopper species list
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370001
Abstract:

This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.




File description including attribute definitions: data_JornadaStudy_412_cattle_horse_sheep_stocking_rates_since_1916
Original investigator: Kris Havstad
Duration: 1916 - ongoing
Dataset ID: 210412001
Abstract:

Stocking rates for cattle, horses, and sheep are provided for the Jornada Experimental Range beginning in 1916. Goats were few and are included as part of the sheep category and not differentiated.




File description including attribute definitions: JornadaStudy_007_npp_lizard_pitfall_trap_data, File description including attribute definitions: lizard code list
Original investigator: David Lightfoot
Duration: 1989 - 2006
Dataset ID: 210007001
Abstract:

In conjunction with net primary production studies, consumer and faunal studies were conducted at or near NPP sites using pitfall traps. We used live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement was used with the lizards. Variables measured included species, sex, recapture status, snout-vent length, total length, weight, and whether tail was broken or whole. This study is complete.




Download data: Plain text icon Lizardcodelist.txt
File description including attribute definitions: JornadaStudy_007_npp_lizard_pitfall_trap_data, File description including attribute definitions: lizard code list
Original investigator: David Lightfoot
Duration: 1989 - 2006
Dataset ID: 210007001
Abstract:

In conjunction with net primary production studies, consumer and faunal studies were conducted at or near NPP sites using pitfall traps. We used live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement was used with the lizards. Variables measured included species, sex, recapture status, snout-vent length, total length, weight, and whether tail was broken or whole. This study is complete.




Download data: File mesomite.dat
File description including attribute definitions: data_JornadaStudy_385_fluff_grass_mesocosm_microarthropod_numbers
Original investigator: John Anderson
Duration: 1986 - 1987
Dataset ID: 210385009
Abstract:

A mesocosm experiment was conducted on fluff grass plants to look at the effect of exclusion of mites (with chlordane), nematodes (with NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen. Numbers of microarthropods per 1000g of soil is recorded in this data file.




Download data: File hwbrowtn.dat
File description including attribute definitions: data_JornadaStudy_373_transect_rabbit_browse_total_nitrogen
Original investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1987
Dataset ID: 210373002
Abstract:

Rabbit browse (clippings) were collected from 24 5x5m plots at approximately 1 month intervals. Dry weight by date and plot was recorded. Plant material collected was subsampled and analyzed for Total N. Plots are located along LTER-I Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope (around station C48 and T46). (See site description.)


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