Ultraviolet Radiation Tolerance in High Elevation Copepods from the Rocky Mountains of Colorado, USA Page: 22
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in the study sites and therefore was a suitable source of water used to maintain copepods
during testing.
Emerald Lake; Rocky Mountain National Park
Emerald Lake is located within Rocky Mountain National Park in northern Colorado. This
lake sits between Hallett's Peak and Flattop Mountain. The water is relatively clear; UVA and
UVB penetrate to the bottom. This lake is inhabited by fish as well as red copepods. It is below
treeline.
Crater Lake; Mount Blanca
Crater Lake is on Mount Blanca in the Sangre de Cristo mountain range in southern
Colorado. It is above treeline. The water is cold and clear, with UVR penetration to the bottom.
It is inhabited by fish and red copepods.
Measurement of Radiation in Each Study Site
In order to approximate the daily dose of UVR copepods receive in each study site, a
PUV multi-wavelength radiometer (Biospherical Instruments Inc., San Diego, CA) was used to
measure UVA (A = 380 nm), UVB (A = 318 nm), and photosynthetically active radiation (PAR, A =
400-700 nm, visible light). Continuous light and depth measurement were taken along the
entire water column. Peak UVR occurs between 10 AM and 2 PM in Colorado during summer,
and so measurements were taken at approximately 10:00 AM, 12:00 PM, and 2:00PM for each
site. Measurements were taken on two representative days for the moraine ponds, but only
one profile was completed for Emerald and Crater Lakes. The solar radiation profile of Emerald
Lake was taken during the summer of 2008 and was not repeated during the summer of 2010
due to limitations on research permits. For measurement of solar radiation in the Moraine22
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Hudelson, Karista. Ultraviolet Radiation Tolerance in High Elevation Copepods from the Rocky Mountains of Colorado, USA, thesis, December 2011; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc103331/m1/29/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .