Ecology and Management of Aquatic...
Transcript of Ecology and Management of Aquatic...
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Ecology and Management of Aquatic Vegetation
Ch 4, 10 Fisheries Techniques
Ch 17, 18, 20 Wildlife Techniques
Quote for today: "The gods do not deduct from man's allotted span the hours spent in fishing.” Babylonian Proverb
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Objectives
What makes up aquatic veg
Functions of aquatic veg
Management strategies for aquatic veg
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Functions
Producers
Sequester nutrients, filter pollutants, improve water quality
Lock sediments in place, stabilize shore
Food for wildlife, fish, crayfish
Cover for wildlife, fish, aquatic inverts
Aesthetic beauty
Can get out of control esp exotics, so need management
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Aquatic Vegetation
Algae
Phytoplankton
Filamentous algae
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Flowering plants (Macrophytes) - Submerged (SAV)
Hydrilla, milfoil, Elodea, coontail
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Flowering plants (Macrophytes) – free floating
Duckweed, not rooted to soil
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Flowering plants (Macrophytes) - Rooted floating
Water lily, Pondweed
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Flowering plants (Macrophytes) - Emergent
Grasslike plants
Rushes, Sedges
Cattails, willow trees
Purple loosestrife
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Problems
Impair recreation, water quality
DO depletion, Summer or winter fish kills
Odors and tastes to drinking water
Impedes flow of water, clogs outflows encouraging mosquitos
Trap and accumulate sediment
Aesthetic appeal declines
Too much habitat for fish
Destroys natives aquatic plants
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Aquatic Vegetation
Management
Find a balance
Know how to fish it!
Control it when warranted
Eradicate certain exotics
Methods
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Aquatic Vegetation Management
Preventive control
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Aquatic Vegetation Management
Mechanical:
Harvesting
Dredging
Shading
Draw downs
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Aquatic Vegetation Management
Chemicals
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Aquatic Vegetation Management
Biological
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Aquatic Vegetation Management
Habitat alteration
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Aquatic Vegetation
Natural Succession of lentic systems
Eutrophication
Cultural Eutrophication
Manage it for balance