PHOSPHATE IN LAKES AND STREAMS

PHOSPHORUS IN SURFACE WATER PARTICULATE PHOSPHORUS In living things In minerals or adsorbed to clays, etc. Adsorbed to dead organics DISSOLVED PHOSPHORUS Orthophosphates Polyphosphates Organic molecules with phosphorus Esters of phosphate

P IN STRATIFIED LAKES

TOTAL P AND CHLOROPHYLL

NUTRIENT PROFILES OF THE RIFT LAKES SRP= Soluble Reactive Phosphate

PHOSPHATE CYCLE

RED MUD – BLACK MUD

P AT SEDIMENT – WATER INTERFACE

Chambers oxygenated Chambers anoxic

Conditions 30cm from bottom in 14M deep lake.

SULFATE REDUCING BACTERIA AND RELEASE OF PHOSPHATE

EPIPELIC ALGAE, PH & PHOSPHATE

MACROPHYTES PUMPING P FROM SEDIMENT TO WATER COLUMN

FORMS OF P IN THE EPILIMNION

CALCITE AND P ADSORPTION

ANTHROPOGENIC SOURCES

PHOSPHORUS AND LAKE 226

P AND PRIMARY PRODUCTION

PRODUCTIVITY AND TOTAL PHOSPHORUS LEVEL OF PRODUCTIVITY TOTAL P (µg/L) ULTRA OLIGOTROPHIC <5 OLIGO MESOTROPHIC 5-10 MESO EUTROPHIC 10-30 EUTROPHIC 30-100 HYPEREUTROPHIC >100

NUTRIENT LOADING WATERSHED AREA AREAL INPUT RATE FLUSHING RATE EXTENT OF MIXING

SOURCES FOR NUTRIENT LOADING IN CHESAPEAKE BAY

POINT-SOURCE DECLINE IN PHOSPHATE LOADING IN CHESAPEAKE BAY

LAKE POWELL AND LAKE MEADE

MISSISSIPPI RIVER

LAKE PONCHARTRAIN

LAKE PONCHARTRAIN

LAKE ERIE