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Growth data was collected on four graminoid species on Arctic LTER experimental plots in moist acidic tussock and dry heath tundra 2004, Toolik Field Station, Alaska.

Weekly growth of plant species of three growth forms were measured in the ninth year of a long-term experiment at Toolik Field Station. The experimental treatments excluded small and large mammalian herbivores and increased soil nutrients in two arctic Alaskan tundra communities: moist acidic tussock and dry heath. This data set reports the four graminoid (both tussock and rhizomatous forms) species. Please see 2004lggrbnan for Betula nana (dwarf shrub) growth data.

Above ground plant and below ground stem biomass in the Arctic LTER moist acidic tussock tundra experimental plots, 2006, Toolik Lake, Alaska

Above ground plant and below ground stem biomass, percent nitrogen, and percent carbon were measured in the Arctic LTER moist acidic tundra experimental plots. Treatments included control, and nitrogen and phosphorus amended plots for 10 years, and exclosure plots with and without added nitrogen and phosphorus.

Arctic LTER 2007: Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic tussock and dry heath tundra.

Relative percent cover was measured for plant species on Arctic LTER experimental plots at Toolik field station in moist acidic tussock and dry heath tundra.

Bacterial Production Data for lakes and lake inlets/outlets samples collected summer 2008, Arctic LTER, Toolik Research Station, Alaska.

Yearly file containing information on bacterial productivity. Samples were collected at various sites near Toolik Research Station (68 38'N, 149 36'W). Sample site descriptors include an assigned number (sortchem), site, date, time and depth.

Bacterial Production Data for lakes and lake inlets/outlets samples collected summer 2007, Arctic LTER, Toolik Research Station, Alaska.

Bacterial Production Data for lakes and lake inlets/outlets samples collected summer 2009, Arctic LTER, Toolik Research Station, Alaska.

Toolik Inlet Discharge Data collected in summer 2009, Arctic LTER, Toolik Research Station, Alaska.

Stream discharge, stage height, temperature, and conductivity of Toolik Inlet during the 2009 study season.

Bacterial Production Data for lakes and lake inlets/outlets samples collected summer 2010, Arctic LTER, Toolik Research Station, Alaska.

Bacterial Production Data for lakes and lake inlets/outlets samples collected summer 2011, Arctic LTER, Toolik Research Station, Alaska.

Zooplankton density for lake samples collected near Toolik Lake Arctic LTER in the summer from 1983 to 1992.

Zooplankton density in number per liter for all samples collected from arctic lakes near Toolik Lake Field Station (Arctic LTER) in summer from 1983 to 1992 (inclusive). NOTE: The dates for 1992 are WRONG in versions 1 and 2. The original dates were entered in several date formats which resulted in conversion errors.

Arctic LTER 1988: del 13C and del 15N ratios measurement for Eriophorum, Carex and lichen species in water tracks at Toolik and Imnavait Creek

del 13C and del 15N ratios were measured for plant and lichen in watertracks in the Toolik Lake drainage and the east facing slope of the Imnavait Creek area. Sampling locations for each species for a specific date were chosen across an elevation gradient starting from the lakeside and leading to ridge crest. The vegetation was dried and analyzed for stable isotopes.

Arctic LTER 1991: Percent moisture, bulk density, percent loss on ignition and percent organic carbon were measured for peat collected from soils in the Imnavait Creek watershed.

Percent moisture, bulk density, percent loss on ignition and percent organic carbon were measured for peat collected from soils in the Imnavait Creek watershed.

Relative percent cover of plant species in LTER moist acidic, dry heath, and moist non-acidic tundra experimental plots; in new experimental plots established in 2006; and for Sagavanirktok River plots in tussock and heath tundra, Norht Slope Alaska 2008.

In 2008, Relative percent cover of plant species was measured in the Arctic LTER's experimental and control plots across several habitats: moist acidic, dry heath, and moist non-acidic tundra; in new variable (low) nutrient addition experimental plots established in 2006; and for Sagavanirktok River toposequence plots in tussock and heath tundra.

2010 relative percent cover of plant species in LTER moist acidic, dry heath, and moist non-acidic tundra experimental plots; and in new experimental plots established in 2006.

In 2010, Relative percent cover of plant species was measured in the Arctic LTER's experimental and control plots across several habitats: moist acidic, dry heath, and moist non-acidic tundra; in new variable (low) nutrient addition experimental plots established in 2006; and for Sagavanirktok River toposequence plots in tussock and heath tundra.

2011 relative percent cover of plant species in LTER moist acidic tundra experimental plots and in new experimental plots established in 2006.

In 2011, relative percent cover of plant species was measured in LTER moist acidic tundra experimental plots and in new experimental plots established in 2006.

Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 2000 to 2009

Decadal file describing the physical/chemical values recorded at various lakes near Toolik Research Station during summers from 2000 to 2009. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situ with Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and Âµg/l, and PAR.

Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 1990 to 1999

Decadal file describing the physical/chemical values recorded at various lakes near Toolik Research Station during summers from 1990 to 1999. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situ with Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and Âµg/l, and PAR.

Total numbers per square meter and taxa of insects taken during a survey of headwater streams in the Toolik Lake region during the summer of 2001, Arctic LTER 2001.

A Surber sampler (25 X 25 cm frame fitted with a 243 um mesh net) was used to sample invertebrates on a single date at each site. Five replicates were taken from at least two riffles at each site. Samples were preserved in 4% formaldehyde and transported to Orono, Maine, where invertebrates were removed by hand under 15X magnification and then identified and counted. All values are the mean of five replicates and have been converted to individuals per square meter.

Seasonal plant biomass moist acidic tussock tundra, 1983, Arctic LTER, Toolik Lake, Alaska.

Biomass in tussock tundra experimental plots near Toolik Lake, North Slope, AK (68 degrees 38N, 149derees 34W). There were five harvests in 1983. This file is the May 21-22, 1983 harvest.

Above ground plant biomass a moist acidic tussock tundra experimental site, 1984, Acric LTER, Toolik Lake, Alaska.

Above ground plant biomass was measured in a tussock tundra experimental site. The plots were set up in 1981 and have been harvested in previous years (See Shaver and Chapin Ecological Monographs, 61(1), 1991 pp.1-31.) This file is the July 26-27, 1984 harvest of the controls and nitrogen + phosphorus treatments.