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- Deserts (11)
- Grasslands (10)
- Populations (10)
- Shrubs (8)
- Grasses (7)
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- Disturbance (6)
- Inorganic nutrients (5)
- Vegetation (5)
- Plants (4)
- Primary production (4)
- Soil (4)
- Species (4)
- Trees (4)
- Disturbances (3)
- Measurements (3)
- Aboveground biomass (2)
- Biology (2)
- Burning (2)
- Forbs (2)
- Germination (2)
- Lightning (2)
- Lizards (2)
- Phosphorus (2)
- Plant physiology (2)
- Precipitation (2)
- Productivity (2)
- Reproduction (2)
- Reptiles (2)
- Seed banks (2)
- Seeds (2)
Articles 1 - 22 of 22
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Monsoon Rainfall Manipulation Experiment (Mrme) Meteorology Data From A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (7/2007 - 8/2009), Scott Collins
Sevilleta LTER Program Data
The Monsoon Rainfall Manipulation Experiment (MRME) is to understand changes in ecosystem structure and function of a semiarid grassland caused by increased precipitation variability, which alters the pulses of soil moisture that drive primary productivity, community composition, and ecosystem functioning. The overarching hypothesis being tested is that changes in event size and variability will alter grassland productivity, ecosystem processes, and plant community dynamics. In particular, we predict that many small events will increase soil CO2 effluxes by stimulating microbial processes but not plant growth, whereas a small number of large events will increase aboveground NPP and soil respiration by providing …
Local Adaptation To Freezing In High And Low Latitude Populations Of L. Tridentata (Sevilleta National Wildlife Refuge, New Mexico; Higuerillas, Mexico) And L. Divaricata (Bajada Del Diablo And Chamical, Argentina) (2006-2009)), Juliana Medeiros
Sevilleta LTER Program Data
If freezing limits establishment of warm desert shrubs at high latitudes, shrubland distributions may be altered as a result of rising global temperatures. However, variation in plant physiology and morphology can be observed across climate gradients and may be acted on by selection to produce adaptation to local climate conditions, thereby ameliorating low temperature stress. Freezing damage in evergreens is closely linked to vessel size distribution because larger xylem conduits are more likely to become air-filled during freezing. In addition, plastic variation, rather than genetic, may be responsible for differences in freezing tolerance among populations. In order to determine if …
The Burden Of Reproduction In Lizards: Changes In Respiratory Physiology Associated With Reduced Lung Volume At The Sevilleta National Wildlife Refuge (2007-2008), Casey Gilman, Blair Wolf
The Burden Of Reproduction In Lizards: Changes In Respiratory Physiology Associated With Reduced Lung Volume At The Sevilleta National Wildlife Refuge (2007-2008), Casey Gilman, Blair Wolf
Sevilleta LTER Program Data
Previous morphological work on lizards suggests that the volume of growing eggs may result in a significant decrease in lung volume during gravidity. Iguanid lizard lungs are located within continuous thoracic and abdominal cavities and are highly distensible. Because of their distensible nature and lack of a diaphragm, both naturally occurring and introduced structures within the abdominal and thoracic cavities (i.e. organs, food, eggs) compress them and potentially reduce available lung volume for gas exchange. During reproduction, this decrease comes at a time of increased energetic demands, due to the cost of provisioning eggs and the physical burden of transporting …
Master Plant Species Information Database For The Sevilleta National Wildlife Refuge, New Mexico (1989-1996), Tim Lowrey
Master Plant Species Information Database For The Sevilleta National Wildlife Refuge, New Mexico (1989-1996), Tim Lowrey
Sevilleta LTER Program Data
This data base contains taxonomic and ecological information for the plant species on the Sevilleta National Wildlife Refuge.
Litter Fall Collection Study In Pinyon-Juniper, Cottowood, And Spruce-Fir-Aspen Forests At The Sevilleta Nwr, Bosque Del Apache Nwr, And The Cibola National Forest, New Mexico (1992-1993), Robert Parmenter
Sevilleta LTER Program Data
The litterfall study was designed to assess the quantity of biomass (leaves, twigs, reproductive materials) falling from tree species in different ecosystem types. Three study sites selected were:  (1) the pinyon-juniper woodland site near Cerro Montoso on the Sevilleta NWR; (2) the cottonwood forest LTER site along the Rio Grande at Bosque del Apache NWR; and (2) the old-growth spruce-fir-aspen site near South Baldy in the Magdalena Mountains (Cibola National Forest).  The study was conducted over two years (1992-1993) to compare litterfall rates and quantities among sites, seasons and years.
Coyote Scat Survey In The Chihuahuan Desert Grasslands And Creosote Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (1992-2004), Robert Parmenter
Coyote Scat Survey In The Chihuahuan Desert Grasslands And Creosote Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (1992-2004), Robert Parmenter
Sevilleta LTER Program Data
This study measured the population dynamics of coyotes in the grasslands and creosote shrublands of McKenzie Flats, Sevilleta National Wildlife Refuge. The study was begun in January, 1992, and continued quarterly each year. Â Coyotes were sampled via scat counts along the roads of McKenzie Flats during winter, spring, summer, and fall of each year. The entire road transect was 21.5 miles in length. Scat counts over a week period (number of scats/mile/day) in each season along the roads were used to calculate the densities of coyotes (number of coyotes per square kilometer). Results from 1992 to 2002 indicated that …
2003 Prescribed Burn Effect On Chihuahuan Desert Grasses And Shrubs At The Sevilleta National Wildlife Refuge, New Mexico: Shrub Recovery Study (2003-2009), Burton Pendleton
2003 Prescribed Burn Effect On Chihuahuan Desert Grasses And Shrubs At The Sevilleta National Wildlife Refuge, New Mexico: Shrub Recovery Study (2003-2009), Burton Pendleton
Sevilleta LTER Program Data
Disturbance from fire can affect the abundance and distribution of shrubs and grasses in arid ecosystems. In particular, fire may increase grass and forb production while hindering shrub encroachment. Therefore, prescribed fires are a common management tool for maintaining grassland habitats in the southwest. However, Bouteloua eriopoda (black grama), a dominant species in Chihuahuan Desert grassland, is highly susceptible to fire resulting in death followed by slow recovery rates. A prescribed fire on the Sevilleta National Wildlife refuge in central New Mexico in 2003 provided the opportunity to study the effects of infrequent fires on shrub invasion in this region. …
Reptile Populations At The Sevilleta National Wildlife Refuge, New Mexico (1989-1990), Howard Snell
Reptile Populations At The Sevilleta National Wildlife Refuge, New Mexico (1989-1990), Howard Snell
Sevilleta LTER Program Data
Reptile populations were sampled in spring and summer in various habitats: grassland, creosote shrubland, pinyon-juniper woodland, cottonwood forest, subalpine forest, and subalpine meadow. On 18 sites mark-release methods were used; on 12 sites, all animals were kept for museum specimens. Museum specimen preparations included skulls, whole skeletons, and alcohol preservations; all specimens had tissue samples (liver, heart) taken for ultra-cold preservations for genetic analyses; some were karyotyped. All museum specimens were checked for internal parasites.
East-West C3-C4 Grassland Biomass Fertilizer Plots In A Chihuahuan Desert Grassland At The Sevilleta National Wildlife Refuge, New Mexico (1989-1992), James Gosz
Sevilleta LTER Program Data
This dataset contains weights of vegetation biomass collected in fertilizer plots from 1989 through 1992. The data were originally collected to analyze the effects of fertilization on vegetation productivity on the Sevilleta NWR.
Burn Exclosure Rodent Population Study At The Sevilleta National Wildlife Refuge, New Mexico (1991-1993), Robert Parmenter
Burn Exclosure Rodent Population Study At The Sevilleta National Wildlife Refuge, New Mexico (1991-1993), Robert Parmenter
Sevilleta LTER Program Data
Small mammal densities were estimated from small mammal recapture data in burned and unburned grassland.
Plant Water Potentials And Plant Physiology At The Sevilleta National Wildlife Refuge, New Mexico (1989-1992), Charles Wisdom
Plant Water Potentials And Plant Physiology At The Sevilleta National Wildlife Refuge, New Mexico (1989-1992), Charles Wisdom
Sevilleta LTER Program Data
Physiological status of plants is monitored in conjunction with the sampling schedule outlined in Sevilleta Plant Demography. Several perennial life forms, including tree (Juniperus and Pinus), shrub (Larrea) and grass (Oryzopsis and Sporobolus), are being monitored at 1-3 of four sites which differ in elevation and topography as well as edaphic and annual precipitation characteristics. For the 1990 field season we are adding a spring annual, Lesquerella to our sampling efforts at these same sites. Currently, water status (xylem potentials, bars) is monitored twice a year, in spring (after the 'dry' season) and fall (after the 'wet' season). Three replicate …
Lightning Strike Data For New Mexico, 1997, Douglas I. Moore
Lightning Strike Data For New Mexico, 1997, Douglas I. Moore
Sevilleta LTER Program Data
This file contains 1997 daily lightning activity data for the state of New Mexico. These data were collected by a network of lightning detection stations scattered throughout the western United States. More information regarding the LLP Lightning Locating System can be found in Maier et al. (1983).
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Moisture Data From The Sevilleta National Wildlife Refuge, New Mexico (1/2006-8/2009), Scott Collins, William Pockman
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Moisture Data From The Sevilleta National Wildlife Refuge, New Mexico (1/2006-8/2009), Scott Collins, William Pockman
Sevilleta LTER Program Data
This data set provides soil moisture data in each plot of the warming experiment (see SEV176). Data are collected with automated soil moisture probes at 30-minute intervals at two soil depths under grass and bare patches in each of the 40 plots.
Lightning Strike Data For New Mexico, 1998, Douglas I. Moore
Lightning Strike Data For New Mexico, 1998, Douglas I. Moore
Sevilleta LTER Program Data
This file contains 1998 daily lightning activity data for the state of New Mexico. These data were collected by a network of lightning detection stations scattered throughout the western United States. More information regarding the LLP Lightning Locating System can be found in Maier et al. (1983).
Pinon-Juniper Dendrometer, Height, And Crown Area Measurements At Cerro Montosa, Sevilleta National Wildlife Refuge, New Mexico (2006-2009), Esteban Muldavin
Pinon-Juniper Dendrometer, Height, And Crown Area Measurements At Cerro Montosa, Sevilleta National Wildlife Refuge, New Mexico (2006-2009), Esteban Muldavin
Sevilleta LTER Program Data
Allometry is a standard method of determining biomass and Net Primary Production of many trees. One of the standard variables used in such allometric regressions is bole diameter. On straight trunk trees measurements at breast height (DBH) taken using a DBH tape is adequate for quantifying changes in diameter over time. However, in scrub forests such as the Pinon Juniper PJ woodlands, common on the Sevilleta, both the pinon and particularly the junipers are relatively short and multi-trunked so that measurements must be taken near the ground and the consistency between measurements often lead to erroneous growth analysis. To reduce …
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Temperature Data From The Sevilleta National Wildlife Refuge, New Mexico (1/2006 - 7/2009), Scott Collins, William Pockman
Warming-El Nino-Nitrogen Deposition Experiment (Wenndex): Soil Temperature Data From The Sevilleta National Wildlife Refuge, New Mexico (1/2006 - 7/2009), Scott Collins, William Pockman
Sevilleta LTER Program Data
This data set provides soil temperature data in each plot of the warming experiment (see SEV176). Data are collected with automated soil temperature probes at 15-minute intervals at two soil depths under grass and bare patches in each of the 40 plots.
Effects Of Herbivores On Seed Banks Of Grass And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (2004), Terri Koontz
Effects Of Herbivores On Seed Banks Of Grass And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (2004), Terri Koontz
Sevilleta LTER Program Data
Grazers and granivores have the potential to affect seed banks. Several studies have examined the impact of these herbivores on the aboveground vegetation, but few have looked at how they influence the seed bank. I asked whether both grazers and granivores alter the seed bank at the Sevilleta National Wildlife Refuge. Long-term experimental plots were installed in 1996 to exclude grazers and granivores from a grassland and shrubland. Soil samples were collected from these plots and seeds were germinated in a greenhouse. The grassland had significantly more species in its seed bank than the shrubland. Also, the seed bank composition …
Phosphorus Fractions In Grassland And Shrubland Soils At The Sevilleta National Wildlife Refuge, New Mexico (1989), Anne Cross
Sevilleta LTER Program Data
This study examined concentrations of organic and inorganic phosphorus in surface soils of a Bouteloua gracilis-Bouteloua eriopoda grassland and a Larrea tridentata shrubland in the northern Chihuahuan Desert, New Mexico, USA. In this desert, where grassland vegetation has a uniform spatial distribution and individual shrubs have a patchy distribution, vegetation strongly influences the locations and concentrations of soil nutrients. Most studies of soil phosphorus (P) fractions in desert soils have focused on inorganic P fractions and have demonstrated the importance of geochemical controls on soil P cycling. This study addressed whether organic phosphorus, determined by the presence of different vegetation …
Soil Nutrient Distributions In Chihuahuan Desert Grasslands And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (1989), Anne Cross
Sevilleta LTER Program Data
Vegetation throughout the southwestern United States has changed from perennial grassland to woody shrubland over the past century. Previous studies on the development of 'islands of fertility' focused primarily on only the most limiting, plant-essential element, soil nitrogen (N). The research presented here addressed the question of whether other plant-essential elements, namely phosphorus (P) and potassium (K), showed similar concentration gradients under the desert shrub Larrea tridentata (creosotebush). It also examined whether the spatial distribution of N, P, and K differed from that of essential, but non-limiting nutrients, namely calcium (Ca), magnesium (Mg), and sulfur (S), and non-essential elements, namely …
Effects Of Kangaroo Rat Mounds On Seed Banks Of Grass And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (2001), Terri Koontz, Heather Simpson
Effects Of Kangaroo Rat Mounds On Seed Banks Of Grass And Shrublands At The Sevilleta National Wildlife Refuge, New Mexico (2001), Terri Koontz, Heather Simpson
Sevilleta LTER Program Data
Disturbance is a major factor in determining the spatial structure and temporal dynamics of ecological systems. Many studies have been conducted concerning the plant assemblages around Dipodmys spectabilis mounds compared to the off mound area. These studies have shown that annual plant cover is higher on the kangaroo rat mound compared to off the mound. However, no studies have addressed the effects of these rodents disturbance on the soil seed bank. Soil seed banks are an important component of the plant community particularly in arid environments. Annual plants have been known to create viable seeds that remain dormant in the …
Larrea Seedling Monitoring Study At The Sevilleta National Wildlife Refuge, New Mexico (1999- ), Douglas I. Moore
Larrea Seedling Monitoring Study At The Sevilleta National Wildlife Refuge, New Mexico (1999- ), Douglas I. Moore
Sevilleta LTER Program Data
The germination rate of creosote (Larrea tridentata) on the Sevilleta appears to be very low. During the early years of the LTER project it was attempted to quantify such germination through the use of seedling plots which were monitored on a bi-annual basis (spring and fall). During the period from 1989 through 1992 there were no creosote seedling that germinated on the monitoring plots. In 1999 a rather sizeable population of small seedlings was observed in one quite localized area in the vicinity of Five Points. This rather large number of individuals in one very limited area raised several questions:1. …
Snakeweed (Gutierrezia Sarothrae) Habitat Vegetation Transect Data From The Sevilleta National Wildlife Refuge, New Mexico (1996), Douglas I. Moore, Herb Grover
Snakeweed (Gutierrezia Sarothrae) Habitat Vegetation Transect Data From The Sevilleta National Wildlife Refuge, New Mexico (1996), Douglas I. Moore, Herb Grover
Sevilleta LTER Program Data
In 1984, a research project was initiated on a relatively small disturbance patch just south of Deep Well. This disturbance was thought to be the result of an old praire dog town, probably dating back to when a nearby ranch was active, and a lot of old mammal mounds remained in the disturbed area. One of the things that made the disturbance patch particularily noticeable was the lush growth of snakeweed (Gutierrezia sarothrae) within the patch. This prompted the designation of the disturbance patch as the "snakeweed patch" or "gutierrezia patch". In addition, there was an obvious increase in bare …