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 41 - 50 of 141 listed alphabetically [list by similarity]

Gulf of Mexico Climate-History Calibration Study [More info]: Proxy methods allow us to estimate ancient ocean temperatures but only if the method is calibrated using modern samples for which we measure the temperature. This is a proxy method using a sediment trap to collect planktonic foraminifera.
Gulf of Mexico deep-sea coral ecosystem studies, 2008-2011 [More info]: Deep-sea corals, also known as cold-water corals, have become a topic of interest due to conservation concerns over the impacts of trawling, exploration for oil and gas, and climate change.
Holocene evolution of Apalachicola Bay, Florida [More info]: Geophysical surveying, combined with analysis of sediment cores and radiometric dating were used to describe the likely history of formation of this area.
Identification of tsunami deposits in the geologic record; developing criteria using recent tsunami deposits [More info]: Characteristics of recent tsunami deposits, with the knowledge we have about the events that caused them, give us ways to recognize ancient deposits of this type and infer characteristics of those ancient tsunamis as well.
Illustrated field guide for assessing external and internal anomalies in fish [More info]: Links to PDF version of the field guide.
Interagency Grizzly Bear Study Team (IGBST) [More info]: Description of research program for immediate and long-term management of grizzly bears (Ursus arctos horribilis) inhabiting the Greater Yellowstone Ecosystem. Includes links to reports in PDF format and cooperating organizations.
Investigating atmospheric mercury with the U.S. Geological Survey mobile mercury laboratory [More info]: Explains sources of mercury in the air, ways in which mercury is concentrated in animals, and describes how we measure deposition of atmospheric mercury, with summaries of observations.
Johnson Creek basin hydrologic monitoring [More info]: Hydrologic data and analyses of surface-water, water quality, and ground water in the Johnson Creek basin in Oregon.
Lake monitoring field manual [More info]: Handbook on monitoring methods for lake management, including program design, sampling methods and protocol, biota and chemical sampling methods, laboratory methods, preservation of data and samples, glossary, and bibliography. (PDF file, 92 pp.)
Lead Poisoning in Wild Birds [More info]: Even though lead usage has declined due to environmental awareness and regulation, several human sources of lead continue to affect birds. Hunting ammunition and fishing gear are ingested by the birds, with toxic effects.

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