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Photosynthetic Rate (mg C/L/hr) 1000 100 Station 7: June-Sept 1980 1985 1990 1995 2000 2005 YEAR Photosynthetic rate in the cove showed a gradual decline over the study period (Figure 116). The trend line decreased from about 800 to about 550 mg C/L/hr over the period from 1984 to 2003. Linear regression analysis yielded a significant linear regression coefficient of -33.6 mgC/L/hr per year yielding a total decline of 672 mg C/L/hr over the long term study period (Figure 116). Figure 116. Long term trend in Photosynthetic Rate at Light Saturation (GMU Lab Data). Station 7. Gunston Cove. Photosynthetic Rate (mg C/L/hr) 1000 100 10 Station 9: June-Sept 1980 1985 1990 1995 2000 2005 YEAR Photosynthetic rate in the river showed some systematic variability over the study period rising during the early 1990’s and declining in recent years (Figure 117). Linear regression did not show a significant trend over the study period (Table 10). Figure 117. Long term trend in Photosynthetic Rate at Light Saturation (GMU Lab Data). Station 9. River mainstem. 89
90 PBmax (ug C/ug Chl a/hr) 30 25 20 15 10 5 Station 7: June-Sept 1980 1985 1990 1995 2000 2005 YEAR P B max (photosynthetic rate per unit chlorophyll a) showed some systematic variation with a decline in the 1980’s and a rise in the early 1990’s (Figure 118). Linear regression did not reveal any significant long term trends (Tale 10). Figure 118. Long term trend in P B max (GMU Lab Data). Station 7. Gunston Cove. PBmax (ug C/ug Chl a/hr) 30 25 20 15 10 5 Station 9: June-Sept 1980 1985 1990 1995 2000 2005 YEAR In the river the trend line for P B max has generally been about 10 ug C/ug Chl a/hr over the study period (Figure 119). Recent years have suggested a possible decline. Regression analysis over the period of record did not reveal any linear trends (Table 10). Figure 119. Long term trend in P B max (GMU Lab Data). Station 9. Potomac 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
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22 Organic Nitrogen (mg/L) 1.2 1.0
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24 N/P Ratio (by mass) 60 50 40 30
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26 C. Phytoplankton Chlorophyll a,
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28 Figure 32. Phytoplankton Density
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30 The dominant cyanobacteria on a
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32 Total phytoplankton biovolume ca
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34 Melosira Figure 44. Phytoplankto
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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 and 80: 72 Lab pH, GMU 11 10 9 8 7 Station
Page 81 and 82: 74 Total Alkalinity (mg/L CaCO3), G
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: 88 Chlorophyll a, Surface (ug/L) 10
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
Page 131 and 132: 124 Mean Catch Per Trawl 16 14 12 1
Page 133 and 134: 126 Seines The mean annual catch pe
Page 135 and 136: 128 Table 19 The number of seines i
Page 137 and 138: 130 Mean Catch Per Seine 300 250 20
Page 139 and 140: 132 Mean Catch Per Seine 250 200 15
Page 141 and 142: 134 G. Benthos Trends Oligochaetes
Page 143 and 144: 136 Amphipods (#/m2) 16 12 8 4 Stat
Page 145 and 146: 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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