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 alphabetically [list by similarity]

National field manual for the collection of water-quality data [More info]: Field manual (also available in PDF and paper formats) with instructions on techniques to collect and process water samples and to perform measurements of temperature, oxygen content, conductance, pH, turbidity, and fecal contaminants.
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.
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.
Oculina Bank - geology of a deep-water coral reef habitat off Florida [More info]: Brief report on sidescan sonar data, sediment sampling, and submersible and video photography studies of destruction of deep-water coral pinnacles where fish spawn off east-central Florida in the Oculina Bank in order to restore and protect the habitat.
Organic metamorphism in the California petroleum basins: Chapter A - ROCK-EVAL and vitrinite reflectance [More info]: Part A of a complex report on the results of ROCK-EVAL and vitrinite reflectance analysis of a large sample base from more than 70 wells located in three oil-rich California petroleum basins in order to study the formation of oil deposits.

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