Images

This photo shows a passive integrated transponder (PIT) tag reader being used to test a tagged Santa Ana Sucker.

The photo shows (left) the raft outfitted with the PIT tag reader and two cameras, both facing down into the river. And (right) a PIT tag attached to a lure.

The above photos show raceways at the Riverside Corona Resource Conservation District (RCD) facility.

Active (or moving) camera footage of Santa Ana Sucker (Pantosteus santaanae). Cameras were attached to “selfie sticks” and walked up and down the raceways (or fabricated streams).

Footage of Santa Ana Sucker (Pantosteus santaanae) from passive (or stationary) camera. Part of a USGS study on the effectiveness and safety of the PIT tagging sampling method.

An open-source image recognition program was used to detect the fish and lures in the videos. The program was “trained” to recognize the fish and lures by exposing it to approximately 800 images of fish and non-fish.

This is a screenshot of the web tool: Legacy Mercury Contamination from Historical Gold Mining.

Historical photo of the Malakoff Diggins hydraulic gold mine in the Sierra Nevada in California. 

View of San Francisco from the USGS research vessel. The goal of this study was to identify the reasons for discrepancies between fChl measurements made under different sampling conditions. 

Sample map - Legacy Mercury Contamination in California’s Sierra Nevada. This map show locations of remediation efforts.

This is a photo of a Sierran Treefrog (Pseudacris sierra). It was one of the taxa sampled in the study: Legacy Mercury Contamination from Historical Gold Mining.

The above photo includes members of the team associated with research done in collaboration with UC Davis. From left to right, Angela DePalma-Dow (Lake County, conference co-organizer), Sergio Valbuena (UC Davis), Charles Alpers (USGS), Alicia Cortes (UC Davis), and Samantha Sharp (UC Davis).  

USGS scientists Dina Saleh, Fred Feyrer, and Charles Alpers stand next to their poster at the 2024 Clear Lake Symposium.

USGS booth at the 2024 Lake Tahoe Summit. Shown are Zachery Hood (left) and Sara Doyle (right) of the Nevada Water Science Center. Also present were Joseph Nawikas of the California Water Science Center and Ramon Naranjo of Nevada. (Photo by Ramon Naranjo.)

Distance shot of crown gathered for the 2024 Lake Tahoe Summit. Lake Tahoe Summit attendees listen to opening remarks from U.S. Senator Catherine Cortez Masto from Nevada.

The figure shows the locations of the San Gorgonio Pass groundwater monitoring network and planned well sites.

Mount San Jacinto after some winter storms and the windmills. Mount San Jacinto forms the southern border of the San Gorgornio Pass in California.

Lilium pardalinum, or California Tiger Lillies, found along Squirrel Creek in the Plumas National Forest.

Soil moisture sensors positioned in pit at different depths. Inset: close-up of sensor showing the two probes that gather the data.

USGS team in front of Squirrel Creek monitoring station in California's Plumas National Forest.

USGS scientists attaching solar panel and antennae to soil moisture response unit.