TABLES for Electronic Supplementary material
Table S1: Catchment and lake properties for Marshall and Hidden Lake.
Marshall Lake
Hidden Lake
Latitude
40˚ 40.53’
40˚ 44.68’
Longitude
110˚ 52.48’
110˚ 01.39’
Elevation (m)
3042
3155
Lake area (ha)
8.03
5.31
Catchment area (ha)
46.21
54.95
Catchment area/lake Area
5.8
10.3
Maximum lake depth (m)
14.65
15.72
Surrounding vegetation
Spruce -fir forest
Spruce-fir forest
Underlying geology
Quartzite and shales
Quartzite and shales
Water temperature (˚C)
16.3
16.6
Stratified
Yes
Yes
Secchi depth (m)
5.3
3.9
pH
7.4
7.2
Alkalinity mg/L CaCO3
3
3
Specific conductivity (μS/cm)
15.4
14.9
Table S2: Precipitation data for Uinta Mountain sites. Data for the Chepeta SNOTEL site is from the
National Water and Climate Center (2009) and for Vernal and Heber Airport from the Western Regional
Climate Center (2009). All values are 30-year means of annual averages for the period 1971-2000.
Site
Latitude
Longitude
Elevation (m)
Mean Annual
Precipitation
(mm)
Chepeta SNOTEL
40˚47’N
110˚01’W
3228
800
Vernal Airport
40˚26’N
109˚30’W
1668
223
Heber Airport
40˚29’N
111˚43’W
1704
412
Figures for Electronic supplementary material
Figure S1. 210Pb activities and dates for A), C) Marshall Lake and B), D) Hidden Lake. C and D were
previously published in Reynolds et al. (2009).
Figure S2. Principal components analysis plots of geochemical data for Marshall Lake. A) shows
geochemical variables. Each element is represented by an arrow, such that the smaller the angle
between the arrows the more strongly correlated the two variables. Arrows at 90 degrees to one
another are uncorrelated, whereas arrows that plot in opposite directions are negatively correlated. B)
is a plot of samples showing changes in geochemistry with time. Each point represents a different
sediment depth and the distance between points estimates Euclidean distances, so that less distance
indicates greater geochemical similarity.
Figure S3. Principal components analysis plots of geochemical data for Hidden Lake. A) shows
geochemical variables. B) is a plot of changes in geochemistry with time. Further explanation is provided
in Figure S2.
Figure S4. Plots showing diatom assemblages at depth for A) Marshall Lake and B) Hidden Lake. Plots
show relative abundance of each taxa at a given depth.