Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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TABLE 21 continued. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESBiological Controls17) Fungal/bacterial/viralpathogens18) Competition andallelopathy♦♦♦♦Addition of inoculum to initiateattack on algal cellsPlants may tie up sufficientnutrients to limit algal growthPlants may create a lightlimitation on algal growthChemical inhibition of algaemay occur throughsubstances released by otherorganisms♦♦♦♦♦May create lakewide“epidemic” and reduction ofalgal biomassMay provide sustained controlfor several yearsCan be highly specific to algalgroup or generaHarnesses power of naturalbiological interactionsMay provide responsive andprolonged control♦♦♦♦♦♦♦♦Largely experimental approachat this timeConsiderable uncertainty ofresultsMay promote resistant formswith high nuisance potentialMay cause high oxygen demandor release of toxins by lysedalgal cellsEffects on non-target organismsuncertainSome algal forms appearresistantUse of plants may lead toproblems with vascular plantsUse of plant material may causedepression of oxygen levelsLake Pocotopaug Restoration Evaluation 120May 2002
TABLE 21 continued. MANAGEMENT OPTIONS FOR CONTROL OF ALGAEOPTION MODE OF ACTION ADVANTAGES DISADVANTAGESBiological Controls18.a) Plantings fornutrient control18.b) Plantings for lightcontrol♦♦♦Plant growths of sufficientdensity may limit algal accessto nutrientsPlants can exude allelopathicsubstances which inhibit algalgrowthPlant species with floatingleaves can shade out manyalgal growths at elevateddensities♦♦♦♦♦Productivity and associatedhabitat value can remain highwithout algal bloomsPortable plant “pods”, floatingislands, or other structures canbe managed to limitinterference with recreationand provide habitatWetland cells in or adjacent tothe lake can minimize nutrientinputsVascular plants can be moreeasily harvested than mostalgaeMany floating species providevaluable waterfowl food♦♦♦♦♦♦Vascular plants may achievenuisance densitiesThere will be a water depthlimitation on rooted plants butnot algaeVascular plant senescence mayrelease nutrients and causealgal bloomsThe switch from algae tovascular plant domination of alake may cause unexpected orundesirable changes in lakeecology, especially energy flowAt the necessary density, thefloating plants will be arecreational nuisanceLow surface mixing andatmospheric contact will promoteanoxia near the sedimentLake Pocotopaug Restoration Evaluation 121May 2002
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LAKE POCOTOPAUGLAKE AND WATERSHEDRE
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11.3 Prevent algal blooms from occu
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LAYPERSON’S SYNOPSISLake Pocotopa
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The stocking of walleye in Lake Poc
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Lake Pocotopaug Restoration Evaluat
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Period Covered 1988• Pollution fr
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Recommendations included• Algacid
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Major EventDecember 1999 - Fish kil
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Table 5. Land Use from the CT DEP G
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Figure 4. Lake Pocotopaug Bathymetr
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Table 6. QA/QC on Water Quality Dat
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Soils - USDA at MAGIC UCONN Geograp
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Table 8. Water Quality Variables Me
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Phytoplankton samples were collecte
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where many measurements would have
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Figure 7. 2001 Temperature and Diss
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Table 10 continued. 2001 Lake Pocot
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phytoplankton biomass (Wetzel 1983)
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Figure 9. Annual June, July and Aug
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elow 7:1 occurred on September 22,
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Table 12. 2001 Dry and Wet Weather
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Table 12 continued. 2001 Dry and We
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were identified to genus and enumer
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Table 13 continued. 2001 Phytoplank
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Figure 10. 2001 Phytoplankton Bioma
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The late summer bloom of blue-green
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Table 15. 2001 Zooplankton DensityZ
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Table 16. 2001 Zooplankton BiomassZ
Page 76 and 77: 7.0 RELATIONSHIPS AND TRENDS7.1 Pre
Page 78 and 79: Figure 13. 1991-2001 Surface Water
Page 80 and 81: Figure 15. 2001 Surface and Mid-dep
Page 82 and 83: Figure 16. 1991-2001 Chlorophyll a
Page 84 and 85: Figure 18. 2001 Chlorophyll a vs. S
Page 86 and 87: Figure 20. 1991-2001 July and Augus
Page 88 and 89: Table 17. Empirical Model Calculati
Page 90 and 91: Table 18. Total Phosphorus Loading
Page 92 and 93: Table 19. Wet Weather Loading Summa
Page 94 and 95: With the best possible treatment of
Page 96 and 97: water quality should focus on input
Page 98 and 99: 10.0 MANAGEMENT NEEDS AND OBJECTIVE
Page 100 and 101: 11.2 Reducing Total Phosphorus and
Page 102 and 103: undeveloped forest land, an opportu
Page 104 and 105: Figure 22. Buffer Strips for Pollut
Page 106 and 107: Figure 23. Catch Basin with Sump an
Page 108 and 109: early spring to capture what appear
Page 110 and 111: Figure 26. Infiltration Systems.Lak
Page 112 and 113: Figure 27. Constructed Treatment We
Page 114 and 115: Chemical TreatmentIn-stream chemica
Page 116 and 117: TABLE 21. MANAGEMENT OPTIONS FOR CO
Page 118 and 119: TABLE 21 continued. MANAGEMENT OPTI
Page 130 and 131: 12.0 ADDITIONAL DATA NEEDSManagemen
Page 132 and 133: 13.0 RECOMMENDED MANAGEMENT PROGRAM
Page 134 and 135: this point, but as a rough guide, a
Page 136 and 137: 14.0 REFERENCESAd Hoc Lake Advisory
Page 138 and 139: Scheuler T.R., P.A. Kumble, & M.A.
Page 140 and 141: Appendix B:Supplemental Tables and
Page 142: Appendix D:Educational MaterialsLak
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