Distribution of quagga mussel veligers, Dreissena bugensis, in the reservoirs of the Colorado River Aqueduct

Figures & data

Table 1 Copper Basin Reservoir and Lake Mathews physical properties.

Property	Copper Basin Res.	Lake Mathews
Latitude	34°17′15.3²N	35°50′15.5²N
Longitude	114°13′59.0²W	117°26′26.9²W
Area (10^3 m^2)	1719	11,128
Volume (10^3 m^3)	30,059	224,493
Mean Depth (m)	17.5	20.2
Maximum Depth (m)	40	33
Secchi Depth (m)	9.4	6.9
Minimum Residence Time (d)	6.8	74

Figure 1 Study sites: Lake Mathews (left) and Copper Basin Reservoir (right).

Figure 2 Seasonal trends in (a) temperature and (b) volume-weighted veliger concentrations in Copper Basin Reservoir and Lake Mathews during 2008–2009 sampling period.

Figure 3 Vertical profiles of veliger concentrations, temperature and chlorophyll a in Copper Basin Reservoir during 2008–2009 sampling period. Note: Chlorophyll a concentrations were multiplied by 10. The alternating shaded bands represent the sampling interval for each veliger concentration.

Figure 4 Vertical profiles of veligers concentrations, temperature and chlorophyll a in Lake Mathews during 2008–2009 sampling period. Note: April has different veliger scale. Bubbler aeration system operated in summer 2009. Chlorophyll a concentrations were multiplied by 10. The alternating shaded bands represent the sampling interval for each veliger concentration.