golden alga (prymnesium parvum ) salt river lakes marc dahlberg water quality program manager march...
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Golden Alga (Prymnesium parvum) Salt River Lakes
Marc Dahlberg Water Quality Program Manager
March 8, 2011
Golden Alga Temperature range between 5 and 30
degrees Celsius Blooms occur when nutrients are readily
available. When nutrients become depleted toxins are
released. The potency of the Golden alga is nearly
five times greater at a pH 8.5 than it is at 6.5.
Cells are very fragile and are easily ruptured Prefers a saline environment – does very
well in waters with conductivities over 2000 µmhos/cm
Diagnostic Features
8 – 11 microns long
3 – 6 microns wide Nucleus is located
centrally between two chloroplasts
2 equal flagella and a well developed heptonema
Conductivity Saguaro - Canyon – Apache - Roosevelt
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
3000
Saguaro Canyon Apache Roosevelt
Year
Conduct
ivit
y (
µm
hos/
cm)
Conductivity Saguaro - Canyon - Apache
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
Saguaro Canyon ApacheConduct
ivit
y (
µm
hos/
cm)
Average Conductivity Saguaro - Canyon - Apache
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
Year
Conduct
ivit
y
(µm
hos/
cm)
Average Conductivity Saguaro - Canyon - Apache
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
Year
Conduct
ivit
y
(µm
hos/
cm)
Corb
ic-
ula
Rod
eo -
C
hed
iski
Th
read
fin
sh
ad A
ll
sp
ecie
s
All
sp
ecie
s
Th
read
fin
sh
ad
Th
read
fin
sh
ad
Average Conductivity Salt River Lakes (Saguaro-Canyon-Apache) and Salt River below Saguaro
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
Lakes Salt River
Year
Conduct
ivit
y (
µm
hos/
cm)
Conductivity Comparison
1951
1954
1957
1960
1963
1966
1969
1972
1975
1978
1981
1984
1987
1990
1993
1996
1999
2002
2005
2008
2011
0
500
1000
1500
2000
2500
Salt River Below Saguaro Average Saguaro, Canyon, Apache
Year
Conduct
ivit
y (
µm
hos/
cm)
Dead or Dry
Roosevelt Lake -
1928, 1929, 1930, 1931, 1934, 1938, 1940, 1947, 1950, 1951, 1956
San Carlos Lake –
1934, 1938, 1939, 1940, 1946, 1947, 1948, 1950, 1951, 1952, 1953, 1955, 1956, 1957, 1960, 1961, 1965, 1971, 1976, 1977
Bill Silvey
Average Conductivity Salt River Lakes (Saguaro-Canyon-Apache) and Roosevelt Lake
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0
500
1000
1500
2000
2500
3000
Salt River Lakes Roosevelt Lake
Year
Conduct
ivit
y (
um
hos/
cm)
Roosevelt Lake2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0.000
0.500
1.000
1.500
2.000
2.500
3.000
Conductivity umhos/cm -3 Acre Feet -6
Salt River Flows and Conductivity
0-5
00
501-1
000
1001-1
500
1501-2
000
2001-2
500
2501-3
000
3001-3
500
3501-4
000
4001-4
500
4501-5
000
5001-5
500
5501-6
000
6001-6
500
6501-7
000
<7000
0
500
1000
1500
2000
2500
3000
3500
Cubic Feet per Second
Conduct
ivit
y (
µm
hos/
cm)
Tonto Creek Flows and Conductivity
0-1
00
101-2
00
201-3
00
301-4
00
401-5
00
>1000
0
100
200
300
400
500
600
Cubic Feet per Second
Conduct
ivit
y(µ
mhos/
cm)
Roosevelt LakeSeptember 15, 2000 Conductivity
1392
1801
2125
Average Annual Flows at Salt River Diversion Dam
1914
1918
1922
1926
1930
1934
1938
1942
1946
1950
1954
1958
1962
1966
1970
1974
1978
1982
1986
1990
1994
1998
2002
2006
2010
0
500
1000
1500
2000
2500
3000
3500
Year
CFS
Golden Alga Caused Fish Kills in Waters without Forest Fires
Lake Conductivity
Kearney Lake
Water Ranch
Lake Las Vegas
2500 – 8500
2700 – 2900
2500 - 2900
Waters with Forest Fires that Have Not Resulted in a Golden Alga Fish Kill
Lake Conductivity
Horseshoe
Bartlett
Black Canyon Lake
400 – 750
400 – 700
50 -225
July 2002
July 19, 2002Conductivity 2570 Flow
263
July 31, 2002Conductivity 753 Flow
900
Questions?
September 14, 2011 Conductivity 1814 Flow 288
CFS
Roosevelt 1091 1.185 million AF
Apache 1067Canyon 1045Saguaro 1062
Salt River Lakes – Drainage Area
Roosevelt – 5830 square miles Apache – 5842 square miles (12 sq mi) Canyon – 6101 square miles (259 sq
mi) Saguaro – 6330 square miles (229 sq
mi)
92% of the watershed lies above Roosevelt dam
Salt River Lakes - Storage
Roosevelt – 1,653,043 acre feet (81%) Apache – 245,138 acre feet (12%) Canyon Lake – 57,832 acre feet (3%) Saguaro – 73,613 acre feet (4%) Total – 2,029,646 acre feet
Conductivity
The specific conductance test measures the ability of water to pass an electrical current. Conductivity in water is affected by the presence of inorganic dissolved solids such as chloride, sulfate, sodium, calcium and others. The greater the concentrations of ions, the larger the conductivity.
0
500
1000
1500
2000
2500
Year
Conduct
ivit
y (µ
mhos/
cm)
Salt River Below Saguaro Lake