Field Activity 2015-653-FA

Identifier 2015-653-FA
Also known as Tomales Bay, CA 2015 foraminiferal study
Purpose To investigate the present spatial extent and abundance of the invasive foraminifera Trochammina hadai in Tomales Bay, California, comparing both to a baseline study in 1982 and a resampling in 2005.
Location Tomales Bay, California, United States, Pacific Ocean
Summary station locations submitted to FAD 12/7/2015 25 grab samples were obtained on 2015-08-25. Locality information: Station Latitude Longitude 1bs 38.2293 -122.9731 1cs 38.2323 -122.9813 1cw 38.2283 -122.9761 2as 38.2184 -122.9669 2aw 38.2114 -122.9607 2bs 38.2242 -122.9661 2bw 38.2142 -122.9541 3a 38.1944 -122.9361 3b 38.1992 -122.9369 3d 38.2047 -122.9282 4a 38.1872 -122.9147 4b 38.1835 -122.9203 4c 38.1808 -122.9272 5a 38.1639 -122.9158 5b 38.1608 -122.9025 5cs 38.1589 -122.8903 6a 38.1492 -122.8881 6b 38.1478 -122.8917 6c 38.1456 -122.8994 7a 38.1267 -122.8808 7b 38.1294 -122.8744 7c 38.1317 -122.8700 8a 38.1063 -122.8511 8b 38.1058 -122.8533 8c 38.1053 -122.8567
Info derived Census counts and spatial distribution of an invasive foraminifera in Tomales Bay, CA
Comments email message didn't come through; found in admin section: assign a FAN
15-ft Whaler
Start Marshall, CA 2015-08-25
End Marshall, CA 2015-08-26
Days in the field 2
West -123
East -122.76943534
North 38.25327957
South 38.06309583
Marine operations Yes


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Mary L McGann
Crew members
Timothy C Elfers
Scientist, Staff
Information specialist(s)
Mary L McGann
Specialist, Information

Data types and categories

Data category: Location-Elevation, Sampling
Data type: Navigation, Biology, Geology

Equipment used

Equipment Usage description Data types Datasets
Hand-grab sample Biology, Chemistry, Geology 1
Handheld GPS Navigation (no data reported)


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Surface-sediment grain-size distributions of the Elwha River delta, Washington, July 2016 Hand-grab sample This portion of the data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in July 2016 (USGS Field Activity 2016-653-FA). Surface sediment was collected from 67 locations using a small ponar, or 'grab', sampler from the R/V Frontier in water depths between about 1 and 17 m around the delta. An additional 38 samples were collected by hand at low tide. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain size distributions of suitable samples were determined using standard techniques developed by the USGS Pacific Coastal and Marine Science Center sediment lab. Grab samples that yielded less than 50 g of sediment were omitted from analysis and are classified as "no sample". The grain-size data are provided in a comma-delimited spreadsheet (.csv). Andrew Stevens


Samples collected during this field activity