blue green algae appearance in minnesota lakes • examples and characteristics of blue green...
TRANSCRIPT
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Blue Green Algae Appearance in Minnesota Lakes
Matt Lindon, Howard MarkusAnd Steve Heiskary
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Outline
• Examples and Characteristics of Blue Green appearances in the field – Blue Green Clues and Characteristics– What is not Blue Green – Variation within lakes and through summer
• Little Rock Lake Example – Photos and results
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Gelatinous
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Filaments
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Color
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Caking
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Foam Slurry
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Mixed
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Piling
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Skin – Scums
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On aquatic plants
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Fish kills
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“Duckweed”(not an algae)
Algae & other aquatic plants that might be mistaken for blue-green algae
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Algae & other aquatic plants that might be mistaken for blue-green algae Continued.
Filamentous green algae – may form mats on surface
Chara, may float near surface; often found in lakes with high clarity.
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Varies within a short time
North Phalen July 20th 06North Phalen July 16th 06
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Varies through open water season
Near Shore Mid Lake
May
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June
Nearshore Mid-Lake
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July
Nearshore Mid-Lake
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Early August
Nearshore Mid-Lake
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Late August
Nearshore
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SeptemberNearshore
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Diatoms95%
Anacystis5%
Madison Lake May 2006
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Madison Lake June 13 2006
Anabaena 5%
Anacystis10%
Aphanizomenon5%Microcystis
80%
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Microcystis40%
Anabaena25%
Oscillayoria30%
Diatoms5%
Madison Lake Aug 8th 2006
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Little Rock Lake• July 25, 2007 visit by Steve Heiskary, David Tollefson
and Harold Wiegner conducted sampling and observations;
• Response to numerous water quality complaints;• Strong wind from south by southeast so algae were
piling on the north and west shores.• Samples collected at four sites:
1. Lake access/beach area (north side)2. Little Rock Creek inflow3. West shore near 105th Ave.4. Little Rock Lake outlet at Highway 10 (south side)
• All four will be analyzed for microcystin and saxitoxin. Water samples to be analyzed for TP and chlorophyll-a at sites 1 and 4.
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North
Little Rock Lake: 05-0013. Sample sites noted.
1
2 3
4
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Benton County Beach and Lake Access area. Adjacent to site of sample #1
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Beach
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Little Rock Creek on North side; site of sample #2
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Little Rock Creek backwater area
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West shore @ 105th
- sample #3
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Little Rock Lake Microcystin
120
38,00080,000
17 22
1
10
100
1,000
10,000
100,000
7/12/2007 7/26/2007 7/26/2007 7/26/2007 7/26/2007
LITTLE ROCK L. ROCK CK L. ROCK LK LITTLE OUT LITTLE ROC
µg/L
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Little Rock Lake H2S Monitoring
0
5
10
15
20
25
30
35
40
31-J
ul1-
Aug
2-A
ug3-
Aug
4-A
ug5-
Aug
6-A
ug7-
Aug
8-A
ug9-
Aug
10-A
ug11
-Aug
12-A
ug13
-Aug
14-A
ug15
-Aug
16-A
ug17
-Aug
18-A
ug19
-Aug
20-A
ug21
-Aug
22-A
ug23
-Aug
24-A
ug25
-Aug
26-A
ug27
-Aug
28-A
ug29
-Aug
30-A
ug31
-Aug
1-Se
p2-
Sep
3-Se
p4-
Sep
5-Se
p6-
Sep
7-Se
p8-
Sep
9-Se
p10
-Sep
11-S
ep12
-Sep
13-S
ep14
-Sep
H2S
ppb
Air quality standard not to be exceeded more than two times in a five consecutive day period
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Summary
• Appearance• Characteristics • What is not Blue Green
Algae • Little Rock lake example
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Take home message
• Blue Green Algae can have a variety of appearances
• Good assessment can be beneficial – When to test – What message to give