Images

Grinnell Glacier in Glacier National Park.

Mapping the glacier's edge in Glacier National Park.

Monitoring glaciers in Glacier National Park.

Sperry Glacier in Glacier National Park.

Montana Cooperative Fishery Research Unit – Sean Townsend paddles across Kintla Lake in Glacier National Park, sampling for invasive lake trout. Native bull trout are negatively affected by invasives such as lake trout and runoff from upstream glaciers.

Two researchers traverse Grinnell Glacier in Glacier National Park.

USGS Physical Scientist Erich Peitzsch sets up a weather station on Snowslip Mountain in Glacier National Park.  It provides meteorological data for avalanche forecasting and research, including wind speed and direction, air temperature, relative humidity, and net radiation measurements.

The Garden Wall Weather Station is situated below the Garden Wall and adjacent to the Haystack Creek avalanche path in Glacier National Park. It provides meteorological data for avalanche forecasting and research, including wind speed and direction, air temperature, relative humidity, and net radiation measurements.

The thick, crevassed, ice flows of historic Shepard Glacier have been diminished to less than 0.1 square kilometer in area by 2005. According to the criteria set by the USGS Repeat Photography Project, Shepard Glacier is now considered to be too small to be defined as a glacier. (Blase Reardon)

USGS scientist sets up a repeat photograph of Grinnell Glacier in Glacier National Park to illustrate glacial recession due to impacts of climate change.

USGS scientist shoots a repeat photograph of Grinnell Glacier in Glacier National Park to illustrate glacial recession due to impacts of climate change.  *note – logo on scientists hat is logo from USGS Northern Rocky Mountain Science Center, not private.

Image of whitebark pine cone and seeds.

Biologists place a culvert trap in locations that they need data from.  Field crews will set up the culvert trap and check it daily, usually in the morning, to determine if a bear has been captured.  Additionally, trap doors are checked via radio telemetry. 

A biologist measures a grizzly bear’s head length.

Biologists with IGBST and the National Park Service fit a grizzly bear with a radio collar.  Once a bear is radio collared, biologists can track its movements with telemetry.

Biologists use road-killed ungulates such as deer, elk, or bison as bait in the traps. 

Biologists have immobilized the bear and prepare to lift it out of the trap and onto the tarp for data collection.  Once on the tarp the bear is easier to move. 

The kerchief over the grizzly bear’s eyes protects it from dust and debris and reduces visual stimulation. The small tubing in its nose, known as a nasal cannula, delivers oxygen to the animal while it is tranquilized.  

One of the first measurements taken is the bear’s weight using a quadpod and electronic scale. 

Field personnel use bioelectrical impedance to assess body fat percentage of captured bears.  The procedure is similar to how body fat is measured in humans and is based on the resistance of body tissues to the flow of a small, harmless electrical signal.