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- W2189192250 abstract "Water hyacinth, Eichhornia crassipes, recognized as one of the world's most noxious aquatic invasive species is currently invading the San Francisco Bay Delta. Although water hyacinth can tolerate a wide range of environmental conditions, salinity is known to limit its spread in estuaries and tidally influenced streams suggesting that a better understanding of water hyacinth's tolerance to salinity may facilitate its control. While extensive information exists on the salinity levels needed for water hyacinth mortality (6.0-8.0 ‰), virtually no information exists on water hyacinth recovery when the plant experiences temporary exposure to lethal levels of salinity. This study determined the recovery ability of water hyacinth as a function of three factors: exposure duration, salinity level, and recovery time. Water hyacinth were exposed to salinity levels of 5.0 ‰, 6.0 ‰, and 7.0 ‰ for 7, 14, 21, and 28 day periods. After exposure the water hyacinth were allowed 7 and 14 days to recover in non-saline environments. Wet plant weight and leaf chlorophyll were used as indictors of water hyacinth health. The multiple linear regression of weight on salinity, exposure duration, recovery, and interactions explained 77% of the variability in weight and was highly significant (p<0.0001). Recovery did not significantly affect leaf chlorophyll. Recovery rates were greatest for water hyacinth experiencing the shortest exposure times at the lowest salinity levels. This study determined that the base level needed for water hyacinth mortality where no recovery would occur is an exposure of 21 days at 7 ppt salinity." @default.
- W2189192250 created "2016-06-24" @default.
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- W2189192250 date "2005-01-01" @default.
- W2189192250 modified "2023-09-27" @default.
- W2189192250 title "Water Hyacinth: Assessing Recovery from Salinity Induced Stress" @default.
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