NEW: Annual Report - George Mason University

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Lab pH, Noman Cole Lab 11 10 9 8 Station 7: June-Sept 7 1980 1985 1990 1995 2000 2005 YEAR 73 Lab pH as measured by LP personnel were generally in the range 8 to 9.5 over the long term study period (Figure 84). Recent data indicate a slight decline over recent years. Linear regression indicated a significant decline in pH over the study period at a rate of about 0.013 pH units per year or a total of 0.26 units over 20 years. Figure 84. Long term trend in Lab pH (NC Lab Data). Station 7. Gunston Cove. Lab pH, Noman Cole Lab 11 10 9 8 Station 9: June-Sept 7 1980 1985 1990 1995 2000 2005 YEAR In the river, long term pH trends as measured by Noman Cole lab personnel indicate that most values fell between 7.5 and 9. The trend line has increased and decreased slightly over the years with the most recent trend a slight decline. pH in the river showed a significant linear decline identical to that in the cove (Table 11). Figure 85. Long term trend in Lab pH (NC Lab Data). Station 9. Potomac mainstem.
74 Total Alkalinity (mg/L CaCO3), GMU 100 90 80 70 60 50 40 30 Station 7: June-Sept 20 1980 1985 1990 1995 2000 2005 YEAR Total alkalinity as measured by GMU personnel has shown a trend line increase from about 55 mg/L as CaCO3 in 1984 to about 65 mg/L in 1991 followed by a graduate decline which reached about 60 mg/L in 2003 (Figure 86). A linear regression over the whole study period was not significant (Table 10). Figure 86. Long term trend in Total Alkalinity (GMU Lab Data). Station 7. Gunston Cove. Total Alkalinity (mg/L CaCO3), GMU 110 100 90 80 70 60 50 Station 9: June-Sept 40 1980 1985 1990 1995 2000 2005 YEAR Total alkalinity in the river as measured by GMU personnel has covered a fairly broad range each year (Figure 87). The trend line was fairly constant from 1984 to 1990 at about 65 mg/L as CaCO3, rose to about 75 mg/L in 1995 and has declined in recent years to about 65 mg/L in 2003. A significant increase in alkalinity was suggested by linear regression analysis at a rate of 0.38 mg/L per year (Table 10). Figure 87. term trend in Total Alkalinity (GMU Lab Data). Station 9. River mainstem.
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An Ecological Study of Gunston Cove
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ii An Ecological Study of Gunston C
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iv were collected on three sample d
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vi We recommend that: 1. Long term
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2 INTRODUCTION This section reports
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4 Table 1 Sampling Dates and Weathe
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6 immediately with formalin to a co
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8 subsample of known volume and res
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10 A. Climate and Hydrological Fact
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12 B. Physico-chemical Parameters:
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14 Dissolved Oxygen (mg/L) 16 14 12
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16 pH, NC Lab 9.5 9.0 8.5 8.0 7.5 7
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18 Secchi Depth (m) 1.2 1.0 0.8 0.6
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20 Ammonia Nitrogen (mg/L) 0.30 0.2
Page 29 and 30: 22 Organic Nitrogen (mg/L) 1.2 1.0
Page 31 and 32: 24 N/P Ratio (by mass) 60 50 40 30
Page 33 and 34: 26 C. Phytoplankton Chlorophyll a,
Page 35 and 36: 28 Figure 32. Phytoplankton Density
Page 37 and 38: 30 The dominant cyanobacteria on a
Page 39 and 40: 32 Total phytoplankton biovolume ca
Page 41 and 42: 34 Melosira Figure 44. Phytoplankto
Page 43 and 44: 36 Bosmina Density by Station (#/L)
Page 45 and 46: 38 Moina Density by Station (#/m 3
Page 47 and 48: 40 Diaptomus Density by Station (#/
Page 49 and 50: 42 E. Ichthoplankton Larval fishes
Page 51 and 52: 44 Clupeid Larvae (#/10m 3 ) 50 40
Page 53 and 54: 46 Table 4 Adult and Juvenile Fish
Page 55 and 56: 48 The abundance of each species in
Page 57 and 58: 50 Average Number of Fish per Trawl
Page 63 and 64: 56 Average Fish per Seine 600 500 4
Page 65 and 66: 58 Macrobenthos (#/m 2 ) 500 400 30
Page 67 and 68: 60 Total phosphorus levels were fai
Page 69 and 70: 62 Table 10 Correlation and Linear
Page 71 and 72: 64 Water Temperature (oC) 35 30 25
Page 73 and 74: 66 Chloride (mg/L) 350 300 250 200
Page 75 and 76: 68 Dissolved Oxygen (% saturation)
Page 77 and 78: 70 Light Attenuation Coefficient (m
Page 79: 72 Lab pH, GMU 11 10 9 8 7 Station
Page 83 and 84: 76 Biochemical Oxygen Demand (mg/L)
Page 85 and 86: 78 Volatile Suspended Solids (mg/L)
Page 87 and 88: 80 Soluble Reactive Phosphorus (mg/
Page 89 and 90: 82 Un-ionized Ammonia Nitrogen (mg/
Page 91 and 92: 84 Nitrite Nitrogen (mg/L) 0.100 0.
Page 93 and 94: 86 Nitrogen:Phosphorus Ratio 70 60
Page 95 and 96: 88 Chlorophyll a, Surface (ug/L) 10
Page 97 and 98: 90 PBmax (ug C/ug Chl a/hr) 30 25 2
Page 99 and 100: 92 D. Zooplankton Trends: 1990-2003
Page 101 and 102: 94 Brachionus (#/L) 1000.0 100.0 10
Page 103 and 104: 96 Filinia (#/L) 1000.0 100.0 10.0
Page 105 and 106: 98 Polyarthra (#/L) 1000.0 100.0 10
Page 107 and 108: 100 Diaphanosoma (#/m3) 100000.00 1
Page 109 and 110: 102 Chydorid Cladocera (#/m3) 1000.
Page 111 and 112: 104 Copepod Nauplii (#/L) 1000.0 10
Page 113 and 114: 106 Clupeid Larvae (#/10m3) 1000.0
Page 115 and 116: 108 Atherinid Larvae (#/10m3) 10.00
Page 117 and 118: 110 F. Adult and Juvenile Fish Tren
Page 119 and 120: 112 Table 14 Mean catch of adult an
Page 125 and 126: 118 Mean Catch Per Trawl 50 40 30 2
Page 127 and 128: 120 Mean Catch Per Trawl 8 6 4 2 Tr
Page 129 and 130: 122 Mean Catch Per Trawl 120 100 80
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124 Mean Catch Per Trawl 16 14 12 1
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126 Seines The mean annual catch pe
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128 Table 19 The number of seines i
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130 Mean Catch Per Seine 300 250 20
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132 Mean Catch Per Seine 250 200 15
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134 G. Benthos Trends Oligochaetes
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136 Amphipods (#/m2) 16 12 8 4 Stat
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138 Corbicula (#/m2) 40 30 20 10 St
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140 Table 21 Summary of Important T
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142 observed through 1995. This has
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144 being filled. A dredged channel
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146 Anadromous Fish Survey Pohick,
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148 sized fishes were seen, an atte
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150 Table 3. Fish eggs and larvae c
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152 Total 7 11 237 13 2 64 119 (2.3
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154 Table 7. Adult anadromous and s
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156 Table 8. Summary of alewife spa
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158 Spawning information on gizzard
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160 The information that pertains t
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162 lower reaches of Pohick Creek i
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164 Table 13. Catches of adult clup
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Appendix A Phytoplankton Species Di
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