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Long-Term Impacts of Acidic Deposition on Brook Trout in Honnedaga - - PowerPoint PPT Presentation
Long-Term Impacts of Acidic Deposition on Brook Trout in Honnedaga - - PowerPoint PPT Presentation
Long-Term Impacts of Acidic Deposition on Brook Trout in Honnedaga Lake, New York Daniel Josephson Adirondack Fishery Research Program Department of Natural Resources Cornell University Colleagues and Cooperators Co-Authors: Justin Chiotti,
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Honnedaga Lake
Surface Area : 312 ha (770 acres) Max Depth : 56 m (183 feet) Elevation : 701 m (2300 feet)
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Historical Honnedaga Lake Fish Community Composition
Prior to 1890 1930 to 1955 Brook Trout Brook Trout Lake Trout (I) 1890-1930 Brook Trout 1955 to Present Lake Trout (I) Brook Trout Round Whitefish (I) White Sucker (I) (I) - Introduced Creek Chub (I)
Source : Webster 1961
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Historical Honnedaga Lake Fish Community & Acidic Deposition
1890 1930 1950 1910 1970 1990 2010
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Water Chemistry Surveys
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Historical Honnedaga Lake Fish Community & Lake Surface pH
1890 1930 1950 1910 1970 1990 2010
4 5 6 7
1890 1910 1930 1950 1970 1990 2010
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50 100 150 200 250 300 350 1980 1990 2000 2010
Monomeric Aluminum (ug/L)
Honnedaga Lake Inorganic Monomeric Aluminum
LETHAL NON-LETHAL
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Honnedaga Lake Brook Trout Lake Surface Water Chemistry
4.5 5.0 5.5
1975 1980 1985 1990 1995 2000 2005 2010
pH
50 100 150 200 250
1975 1980 1985 1990 1995 2000 2005 2010
Al
im (ug/L)
1 2 3 4 5 6
1975 1980 1985 1990 1995 2000 2005 2010
SO4 (mg/L)
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Honnedaga Lake Tributaries
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Mean pH < 5.0 Mean pH > 5.0
pH in Honnedaga Lake Tributaries – Summer (2009)
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Fall Trapnet Surveys : Lake Assessments
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20 40 60 80 100 120 140 1955 1958 1961 1964 1967 1970 1973 1976 1979 1982 1985 1988 1991 1994 1997 2000 2003 2006
CPUE (n/night)
Fall Trapnet CPUE of Brook Trout
No Trap Net Surveys
5 10 15 20 25 30
1970s 2000s
CPUE (n/night)
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Brook Trout Redd Surveys and Spawning Habitat Measurements
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Mean pH < 5.0 Mean pH > 5.0
Documented Brook Trout Spawning Sites (since 2000)
Lake Shoal Tributary
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Annual Brook Trout Redd Counts
10 20 30 40 50 60 70 80 90 2001 2003 2004 2005 2006 2007 2008
Redd Count (n)
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4 5 6 7 T4 T8 T8 East Shore T9
pH
Lake or Trib Redd 1 Redd 2
pH Measurements within Redds and Adjacent Lake & Tributaries
Trib Trib Trib Shoal Shoal
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Stream Electro-fishing Surveys : Lake Assessments
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Honnedaga Lake Tributaries
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50 100 150 200 250 Inorganic Monomeric Aluminum (micrograms/L) YOY Brook Trout Presence (Y/N) N Y P < 0.05 R
2 = 0.65
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 12 14 16 18 20 22 24 50 100 150 200 250
Y O Y B r
- k
T r
- u
t C P U E ( n u m b e r / m
2
) Temperature Alim (micrograms/L)
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 12 14 16 18 20 22 24 50 100 150 200 250
Y O Y B r
- k
T r
- u
t C P U E ( n u m b e r / m
2
) Temperature Alim (micrograms/L)
Presence / Absence Density
Young-of-Year Brook Trout and Alim in Tributaries
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