USGS: Science Topics: field sampling

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Field sampling

Collecting pieces or specimens or making measurements or observations at determined intervals or areas. Results may be used as representative of the whole research area or population.

Subtopics:
Animal tracking (13 items)
Capturing (animals) (20 items)
Drilling and coring (20 items)
Plant and animal tagging (7 items)
Plot sampling (2 items)
Sexing (plants & animals) (3 items)
Specimen collecting (21 items)
Transect sampling (1 items)
Trenching (1 items)
Water sampling (51 items)

Fish inventories (10 items)

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Results 71 - 80 of 141 listed by similarity [list alphabetically]

National Water-Quality Assessment (NAWQA) Program: reconstructed trends national synthesis study. [More info]: Program to compile data from the National Water-Quality Assessment Program study units to study national trends with links to sediment coring sites, video on Salt Lake City, study units identification, and publications.
National Water-Quality Assessment data warehouse [More info]: Data warehouse for national water quality program with links to chemical, biological, and physical data for water, sediment and animal tissues, nutrient, pesticide, and VOC levels, streamflow, and ground water levels from national study units.
Nitrate in ground water near La Pine, Oregon [More info]: Description of project studying hydrologic and chemical processes that affect the movement and fate of nitrogen within the shallow aquifers of the La Pine region of central Oregon.
Nonindigenous aquatic species alert system [More info]: Reports indicating locations where non-indigenous aquatic organisms have been collected. Includes RSS feed you can subscribe to.
Noninvasive methods for monitoring bear population trends [More info]: We estimate population growth rates by collecting hair at natural bear rubs along trails, roads, and fence and power lines, and analyzing the DNA from the hair.
North American Breeding Bird Survey (BBS) [More info]: North American Breeding Bird Survey (BBS) is a cooperative program that monitors the status and trends of North American bird populations. Includes files of results, analyses, route collection maps and raw data.
North Dakota furtakers: educational manual [More info]: Trapping education manual for the beginning or inexperienced trapper intended to provide information on North Dakota's predators and furbearing animals and the basics on how to trap them using good trapping skills and sound fur management.
NPElement: A database of lichen elemental concentrations in the U.S. national parks [More info]: Database providing concentration of heavy metals, nutrients, and trace elements in 75 species of lichens sampled in 43 national park units in 24 states.
Occurrence of selected radionuclides in ground water used for drinking water in the United States [More info]: Results (*.pdf) of a 1998 targeted reconnaissance survey on the sources of radium, polonium, and lead radionuclides, data collection and laboratory methods, existing occurrences in drinking water, risk assessments, and compliance monitoring.
Occurrence, distribution, and concentrations of selected contaminants in streambed- and suspended-sediment samples collected in Bexar County, Texas, 2007-09 [More info]: Study showing which chemicals found in sediments were most common, with methods used and likely consequences of their high concentrations.

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