Accession Number : ADA267665


Title :   Use of Emersion as a Zebra Mussel Control Method


Descriptive Note : Final rept.,


Corporate Author : TEXAS UNIV AT ARLINGTON DEPT OF BIOLOGY


Personal Author(s) : McMahon, Robert F ; Ussery, Thomas A ; Clarke, Michael


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267665.pdf


Report Date : Jun 1993


Pagination or Media Count : 36


Abstract : Data are presented indicating that dewatering of fouled structures or source water drawdown is potentially efficacious for zebra mussel control. These strategies can expose mussels to lethal desiccation or freezing. Zebra mussels survive emersion 3 days at temperatures greater than or equal 25 deg C (77 deg F) regardless of relative humidity (RH). However, as emersion tolerance increases exponentially with decreasing temperature and increasing RH, dewatering or drawdown is best applied during warm, dry summer months. Emersion tolerance was greatly reduced (LT1OO 10-40 hr) (estimated time for 99.9 percent sample mortality) at a lethal temperature of 35 deg C (95 deg F), which suggested that injection of heated air into dewatered structures would increase the mortality rate among emersed mussels. Freezing temperatures greater than or equal-3 deg C (27 deg F) caused rapid mussel mortality (LT100 greater than or equal 24 hr); thus, dewatering of mussel fouled structures when air temperatures are subfreezing shows promise as a mussel-fouling control strategy.


Descriptors :   *ENVIRONMENTAL IMPACT , *MUSSELS , CONTROL , INJECTION , TEMPERATURE , STRATEGY , AIR , FOULING , TOLERANCE , SUMMER , HUMIDITY , MORTALITY RATE , FREEZING , WATER , STRUCTURES , RATES , REDUCTION , TIME


Subject Categories : Biology
      Environmental Health and Safety


Distribution Statement : APPROVED FOR PUBLIC RELEASE