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22,549 results for “AND LTER”
Nitrogen and phosphorus content of mesquite tree tissues from four habitats at the Jornada Basin LTER site, 1987
This data package contains data on measured concentrations of nutrients in mesquite tree tissues collected from four habitat types at the Jornada Basin LTER site. These habitat types include: (1)playa, (2)arroyo,(3)dunes, and (4)grassland and samples were collected in conjunction with phenology studies and natural abundance of N15 sampling during 1987. Leaves, stems, flowers, and pods were collected from mesquite sample tissues and individually digested and analyzed for total nitrogen (Kjeldahl) and total phosphorus. This data set consists of the date of collection, collection site, leaf total nitrogen, stem total nitrogen, flower total nitrogen, pod total nitrogen, leaf total phosphorus, stem total phosphorus, flower total phosphorus, and pod total phosphorus. Data from this study was collected in 1987. Prior data was collected in 1986, but had differing attributes and is therefore published in a separate data package (knb-lter-jrn.210386008).
Nitrate, ammonium, and water content of mesquite root tube soil from three habitats at the Jornada Basin LTER site, 1987
This data package contains data on measured root tube soil nutrients from soil cores collected under mesquite (Prosopis glandulosa)at three habitat types of the Jornada Experimental Range and New Mexico State University College Ranch. These habitat types include: 1)playa, 2)dunes, and (4)grassland. Soil core samples were collected in 1987 by hand-augering a reference core and a root tube core. Subsamples were analyzed for nitrate, ammonium, and soil moisture contents. This data set consists of the date of collection, collection site, nitrate concentration, ammonium concentration, and percent soil moisture. Collected variables also include treatments (irradiation and nematicide) that are not well-documented at this time. Data collection was completed in 1987.
Surface soil nitrogen analyses under mesquite bush canopies and interspaces at the Jornada Basin LTER, 1986
This data package contains soil nitrogen data for soils collected under, or near, mesquite at the Jornada Basin LTER site (LTER-I and II) in 1986. The purpose of this study was to analyze nitrogen concentration in soils associated with mesquite (Prosopis glandulosa). The mesquite soils were sampled at 4 habitats - playa, coppice dune, arroyo, and grassland. An ecosystem dominated by the non-legume, Larrea tridentata, and lacking mesquite was included as a reference. Samples were taken from two depths (0-15cm, 15-30cm) for three beneath canopy positions (stem base, mid-canopy, and edge of canopy) and one non-vegetated interzone position for each shrub. Four shrubs were sampled at each site. The soils were analyzed for Total Kjeldahl Nitrogen (TKN), N03 nitrate, NH4 ammonium. The data set was collected on October 1, 1986 and this study is now complete.
Grassland and mesquite shrubland soil nitrogen mineralization potential from leaching soil incubations at the Jornada Basin LTER, 1986
This data package contains data on soil nitrogen mineralization potential in a variety of grass and mesquite habitats during the early years of the Jornada Basin LTER project (I-II). Soil cores were collected from Jornada Experimental Range and Chihuahuan Desert Rangeland Research Center (CDRRC) lands in May 1986, and observed in a leaching incubation study. The purpose of this study was to measure inorganic soil nitrogen in the context of the shift from grasslands to mesquite dominated ecosystems. Sites include fluff grass (Dasyochloa pulchella), black grama (Bouteloua eriopoda), Sporobolus/Gutierrezia, playa mesquite (Prosopsis glandulosa), and arroyo mesquite ecosystem types. Soil samples were collected on May 12-13, 1986 within the clumps of grass or beneath mesquite at each site, generally 20 cm deep or to the hard pan (whichever came first). During the incubation study, inorganic nitrogen leaching was measured for 28 weeks for each sample. This study is complete.
Daily precipitation from a network of weighing rain gauges on the Jornada Experimental Range (Jornada Basin LTER), 1976-2011.
This completed dataset contains daily precipitation measurements from a network of weighing rain gauges (Belfort Universal Precipitation Gauges, Series 5-780) at 58 locations on the Jornada Experimental Range in Dona Ana County, New Mexico, USA between January 1976 and December 2011. Locations and the dates during which data were collected were generally project-oriented. Temporal coverage per location is quite variable and ranges between 1,647 and 13,024 days. The network was maintained by USDA Agricultural Research Service personnel. After 2011 the remaining weighing rain gauges were replaced by tipping bucket gauges and those data are available separately.
Pre-dawn water potential of leaves from reduced and enhanced precipitation treatments at the Jornada Basin LTER site, 2007-2008
This data package contains pre-dawn water potential data for leaves collected from mesquite shrubs and black grama grasses at the Jornada Basin LTER site in 2007-2008. The purpose of this study was to quantify ecophysiological performance of shrubs and grasses in the context of precipitation manipulations. One mesquite and one black grama leaf from each plot (n = 20 plots; 5 PPT treatments X 4 replicate plots/treatment) were measured 5 times beginning July 2007 and ending in August 2008. The precipitation treatments consisted of +/-80%, +/-50%, and ambient/control. Leaves were excised from plants and immediately measured for water potential (MPa) with a pressure chamber at least 0.5 h before dawn. The data set is complete.
Perennial grass recovery following livestock overgazing and shrub removal: an experiment at the Jornada Experimental Range (Jornada Basin LTER), 1996-2016
The objective of this ongoing study is to determine the effect of cattle grazing and shrub removal on the decline and recovery of perennial grasses in a mesquite-invaded black grama grassland on sandy soils in the northern Chihuahuan Desert. The experiment was implemented as a randomized complete block with 3 levels of grazing (summer, winter, and control) and 2 levels of shrub treatment (shrub removal and control) in each of 3 replicate blocks. The 18 experimental units are 0.5 ha (70 x 70 m) exclosures constructed in a mesquite-invaded black grama grassland in the southwest portion of the Jornada Experimental Range in Dona Ana County, New Mexico, USA. Vegetation sampling was conducted with the line-point intercept method. Initial pre-treatment sampling occurred in 1996. Grazing treatments removed 65-80% of aboveground perennial grass biomass over 24-36 hour periods in each of four years from summer 1996 to winter 2000; shrub removal occurred during this time as well. No livestock grazing or shrub removal have occurred since 2000. Post-treatment sampling occurred in 2002, 2009, and 2016.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 3 meteorological station: 5-minute summary wind and air temperature data: 2018 - ongoing
5-minute summary data at NEAT Block-3 met station. A met station consisting of a 10-meter mast is installed on the northwest corner of the site. Air temperature, wind direction and wind speed sensors are mounted on the mast. A vertical wind profile is measured with anemometers at 0. 45m, 0.90m, 1.90m, 4.40m and 10m on the mast. A wind vane is installed at 2.50m and 8.50m. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 1 meteorological station: 30-minute summary data: 2019 - ongoing
30-minute summary data at NEAT Block-1 met station. A met station consisting of a 10-meter mast is installed on the northwest corner of the site. Air temperature, wind direction and wind speed sensors are mounted on the mast. A vertical wind profile is measured with anemometers at 0. 45m, 0.90m, 1.90m, 4.40m and 10m on the mast. A wind vane is installed at 2.50m and 8.50m. Precipitation is measured. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 3 meteorological station: 1-hour summary data: 2018 - ongoing
Hourly summary data at NEAT Block-3 met station. Average air temperature, relative humidity, wind speed, wind direction, and precipitation as well as albedo, incoming solar, and solar reflective are measured and calculated at an automated meteorological station installed at Jornada LTER NEAT Block-3 site. A vertical wind profile is measured with anemometers at 0. 45m, 0.90m, 1.90m, 4.40m and 10m on the mast. A wind vane is installed at 2.50m and 8.50m. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 1 meteorological station: Daily summary data: 2019 - ongoing
Daily summary data at NEAT Block-1 met station. A met station consisting of a 10-meter mast is installed on the northwest corner of the site. Air temperature, wind direction and wind speed sensors are mounted on the mast. A vertical wind profile is measured with anemometers at 0. 45m, 0.90m, 1.90m, 4.40m and 10m on the mast. A wind vane is installed at 2.50m and 8.50m. Precipitation is measured. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 3 meteorological station: Daily summary data: 2018 - ongoing
Daily summary data at NEAT Block-3 met station. Average air temperature, relative humidity, wind speed, wind direction, and precipitation as well as albedo, incoming solar, and solar reflective are measured and calculated at an automated meteorological station installed at Jornada LTER NEAT Block-3 site. A vertical wind profile is measured with anemometers at 0. 45m, 0.90m, 1.90m, 4.40m and 10m on the mast. A wind vane is installed at 2.50m and 8.50m. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 1 meteorological station: 1-second summary precipitation data: 2019 - ongoing
1-second summary precipitation data at NEAT Block-1 met station. Total precipitation per second is recorded only if there is measurable precipitation. This is recorded at an automated meteorological station installed at Jornada LTER NEAT Block-1 site. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset. IMPORTANT: Rainfall is only recorded when a bucket tip occurs on the tipping bucket rain gauge. If there is missing data due to equipment or other problems, there will be no indication of this within this dataset. The user needs to review precipitation values in the 30 minute or hourly summary datasets to determine if there are missing data in this 1 second detailed precipitation dataset.
Jornada Basin LTER Nutrient and Ecosystem impacts of Aeolian Transport Study (NEAT) Block 3 meteorological station: 1-second summary precipitation data: 2018 - ongoing
1-second summary precipitation data at NEAT Block-3 met station. Total precipitation per second is recorded only if there is measurable precipitation. This is recorded at an automated meteorological station installed at Jornada LTER NEAT Block-3 site. This climate station is operated by the Jornada LTER Program. This is an ONGOING dataset. IMPORTANT: Rainfall is only recorded when a bucket tip occurs on the tipping bucket rain gauge. If there is missing data due to equipment or other problems, there will be no indication of this within this dataset. The user needs to review precipitation values in the 30 minute or hourly summary datasets to determine if there are missing data in this 1 second detailed precipitation dataset.
McMurdo Dry Valleys LTER: High frequency, 1-min pressure measurements of continuous stage (lake level) and ice surface ablation from Lake Hoare, Antarctica from 2012-2016
As part of the McMurdo Dry Valleys Long Term Ecological Research program, continuous stage (lake level) and ice surface ablation were collected at Lake Hoare, located in Taylor Valley, Antarctica. This package contains data measured at 1-minute intervals from Nov 2012 to Apr 2013, Nov 2013 to Feb 2014, and Nov 2014 to Oct 2016.
MCR LTER: Coral Reef: Community Dynamics: Abundance and Species Richness of Fishes Associated with the Coral Porites rus 2000 thru 2011
These data describe the species richness and abundance as part of MCR LTER's reef fish monitoring program to track long-term patterns in species abundance and diversity. This study began in 2000 in the lagoons off of the north shore of the island of Moorea, French Polynesia and the dataset is updated annually. The abundance and life history stage (adults, juveniles or recruits) of all taxa of fishes associated with selected colonies (5-16 colonies per site) of the mound forming coral Porites rus are recorded at seven reef sites located along the north shore of Moorea. These sites are characterized by differences in water depth, distance to the fore reef and the number and types of neighboring corals. Counts are performed by a pair of divers using SCUBA and include semi-cryptic species. The collection of these data was suspended following the last survey conducted in July 2011 due to the extremely low abundance of live P. rus at these locations.
MCR LTER: Coral Reef: Bathymetry Grid for North Shore
These bathymetric data are a combined product of digitized SHOM nautical charts, SRTM30plus bathymetry, small boat surveys, and bathymetry derived from Worldview-2 satellite imagery. Satellite data were collected in collaboration with Le centre de L'Environment de Moorea (CRIOBE). Data products are (x,y,z) point data and images in Coordinate system: UTM zone 6S and Datum: WGS-84.
MCR LTER: North Shore Moored pH sensors, SeaFET 2012-2015 and SAMI 2015-ongoing
This dataset contains only the sensor data and only from the forereef mooring on the north shore. Full carbonate chemistry data derived from water samples where available are in a separate dataset. Sensor data from other locations are in a separate dataset. Near continuous measurements of seawater pH are made at two locations on the north shore of Moorea. On the fore reef, instruments are attached to a mooring cable at 10-m depth at LTER0. On the back reef, instruments are bottom-mounted at a location approximately 400 m landward of the reef crest at LTER0, such that pH of the same water mass is measured at both locations as water moves onto the reef crest and across the back reef (Hench et al. 2008). One SeaFET instrument and one SAMIpH instrument are deployed at each location. Measurements of pH by the SeaFETs are made every 30 minutes; pH measurements by the SAMIs are made every hour. SeaFET data (on the total pH scale) are output using both a constant salinity value (35 PSU) and using salinities measured in situ, if available. SeaFETs are calibrated using independent measures of pH from water samples taken adjacent to the instruments prior, during, and after deployment (using the m-cresol purple method). SAMIs are returned to the manufacturer each year for calibration. This material is based upon work supported by the U.S. National Science Foundation under Grant No. OCE 16-37396 (and earlier awards) as well as a generous gift from the Gordon and Betty Moore Foundation. Research was completed under permits issued by the French Polynesian Government (Délégation à la Recherche) and the Haut-commissariat de la République en Polynésie Francaise (DTRT) (Protocole d'Accueil 2005-2019). This work represents a contribution of the Moorea Coral Reef (MCR) LTER Site.
MCR LTER: Coral Reef: Water Column nutrient data in lagoons of Moorea, French Polynesia
Nutrients are important for ecosystem structure and community dynamics. To quantify fine-scale patterns of variation in water column nutrients in tropical lagoon ecosystems, nitrite + nitrate, phosphate, and silicate were quantified from water column samples collected in lagoons around Moorea, French Polynesia during April-May starting in 2021 using flow injection with an automated ion analyzer. Over the first three years, water column nitrite + nitrate and silicate were higher in bays and fringing reef habitats, and phosphate was higher in bays.
MCR LTER: Genetics: Settlement dynamics in the three-spot damselfish, Dascyllus trimaculatus
These data describe the genetics of recruiting Dascyllus trimaculatus. We first placed two rows of 8 anemones in a region (the west side of the bay of Opunohu) previously devoid of anemones. Anemones are 10 meters apart, the two rows are 100 meters apart. The row close to the reef crest is called crest , or OUT, row, the row away from the crest and close to the boat channel is called channel, or IN, row. The project started with the placement of the anemones in the fall of 2000. Since then, we regularly clear the anemones of Dascyllus and then collect newly settled fishes every morning. These fishes are later typed by sequencing the mitochondrial control region. Fishes are labeled as follows: DTR IN 01010205. This is a Dascyllus Trimaculatus collected on the channel row, first anemone, on January 2nd 2005. Anemones are numbered 1 to 8, from west to east. These data are published in Bernardi, G., R. Beldade, S.J. Holbrook and R.J. Schmitt. 2012. Full-sibs in cohorts of newly settled coral reef fishes. PloS One 7(9):e44953.
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