Rassa Draugelis-Dale, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 18
Reproductive health of yellow perch Perca flavescens in selected tributaries of the Chesapeake Bay Reproductive health of yellow perch Perca flavescens in selected tributaries of the Chesapeake Bay
Reduced recruitment of yellow perch has been noted for a number of years in certain urbanized watersheds (South and Severn Rivers) of the Chesapeake Bay. Other rapidly developing watersheds such as Mattawoman Creek are more recently showing evidence of reduced recruitment of anadromous fishes. In this study, we used a battery of biomarkers to better document the reproductive health of...
Authors
Vicki Blazer, Alfred E. Pinkney, Jill A. Jenkins, Luke R. Iwanowicz, Steven Minkkinen, Rassa O. Draugelis-Dale, James H. Uphoff
Sperm quality assessments for endangered razorback suckers Xyrauchen texanus Sperm quality assessments for endangered razorback suckers Xyrauchen texanus
Flow cytometry (FCM) and computer-assisted sperm motion analysis (CASA) methods were developed and validated for use with endangered razorback suckers Xyrauchen texanus collected (n=64) during the 2006 spawning season. Sperm motility could be activated within osmolality ranges noted during milt collections (here 167–343 mOsm/kg). We hypothesized that sperm quality of milt collected into...
Authors
Jill A. Jenkins, Bruce E. Eilts, Amy M. Guitreau, Chester R. Figiel, Rassa O. Draugelis-Dale, Terrence R. Tiersch
Davis Pond freshwater diversion biomonitoring: Prediversion and postdiversion freshwater fish data Davis Pond freshwater diversion biomonitoring: Prediversion and postdiversion freshwater fish data
No abstract available.
Authors
Jill A. Jenkins, Heather M. Olivier, Rassa Draugelis-Dale, Michael D. Kaller
Effects of herbivory and flooding on reforestation of baldcypress (Taxodium distichum [L.]) saplings planted in Caddo Lake, Texas Effects of herbivory and flooding on reforestation of baldcypress (Taxodium distichum [L.]) saplings planted in Caddo Lake, Texas
The effects of herbivory and flooding were examined on survival and growth of planted baldcypress (Taxodium distichum (L.) Rich.) saplings at three sites in Caddo Lake, TX, over a 4-yr period. There were two flood regimes (shallow periodic and deep continuous), where half of the saplings in each flood regime were protected by tree shelters to prevent herbivory. By the end of the first...
Authors
Bobby D. Keeland, Rassa O. Dale, Roy Darville, John W. McCoy
Tree growth and mortality during 20 years of managing a Green-Tree Reservoir in Arkansas, USA Tree growth and mortality during 20 years of managing a Green-Tree Reservoir in Arkansas, USA
Green-Tree Reservoirs (GTR) are bottomland hardwood forests that are flooded during late fall and winter to provide waterfowl habitat. Early reports suggested that increased moisture improved tree growth and mast production; however, recent reports showed reduced vigor and growth. This study examines the effects of 20 years of GTR management practices in the Felsenthal National Wildlife...
Authors
Bobby D. Keeland, Rassa O. Draugelis-Dale, John W. McCoy
A comparison of litter production in young and old baldcypress (Taxodium distichum L.) stands at Caddo Lake, Texas A comparison of litter production in young and old baldcypress (Taxodium distichum L.) stands at Caddo Lake, Texas
Aboveground primary productivity for cypress forests was assessed from measurements of litter production in two age groups and in two hydrological regimes (standing water and free-flowing). Caddo Lake, located in northeast Texas on the Texas-Louisiana border, offered a unique study site since it is dominated by extensive stands composed entirely of Taxodium distichum (L.) Rich,...
Authors
John W. McCoy, Rassa O. Draugelis-Dale, Bobby D. Keeland, Roy Darville
Science and Products
Filter Total Items: 18
Reproductive health of yellow perch Perca flavescens in selected tributaries of the Chesapeake Bay Reproductive health of yellow perch Perca flavescens in selected tributaries of the Chesapeake Bay
Reduced recruitment of yellow perch has been noted for a number of years in certain urbanized watersheds (South and Severn Rivers) of the Chesapeake Bay. Other rapidly developing watersheds such as Mattawoman Creek are more recently showing evidence of reduced recruitment of anadromous fishes. In this study, we used a battery of biomarkers to better document the reproductive health of...
Authors
Vicki Blazer, Alfred E. Pinkney, Jill A. Jenkins, Luke R. Iwanowicz, Steven Minkkinen, Rassa O. Draugelis-Dale, James H. Uphoff
Sperm quality assessments for endangered razorback suckers Xyrauchen texanus Sperm quality assessments for endangered razorback suckers Xyrauchen texanus
Flow cytometry (FCM) and computer-assisted sperm motion analysis (CASA) methods were developed and validated for use with endangered razorback suckers Xyrauchen texanus collected (n=64) during the 2006 spawning season. Sperm motility could be activated within osmolality ranges noted during milt collections (here 167–343 mOsm/kg). We hypothesized that sperm quality of milt collected into...
Authors
Jill A. Jenkins, Bruce E. Eilts, Amy M. Guitreau, Chester R. Figiel, Rassa O. Draugelis-Dale, Terrence R. Tiersch
Davis Pond freshwater diversion biomonitoring: Prediversion and postdiversion freshwater fish data Davis Pond freshwater diversion biomonitoring: Prediversion and postdiversion freshwater fish data
No abstract available.
Authors
Jill A. Jenkins, Heather M. Olivier, Rassa Draugelis-Dale, Michael D. Kaller
Effects of herbivory and flooding on reforestation of baldcypress (Taxodium distichum [L.]) saplings planted in Caddo Lake, Texas Effects of herbivory and flooding on reforestation of baldcypress (Taxodium distichum [L.]) saplings planted in Caddo Lake, Texas
The effects of herbivory and flooding were examined on survival and growth of planted baldcypress (Taxodium distichum (L.) Rich.) saplings at three sites in Caddo Lake, TX, over a 4-yr period. There were two flood regimes (shallow periodic and deep continuous), where half of the saplings in each flood regime were protected by tree shelters to prevent herbivory. By the end of the first...
Authors
Bobby D. Keeland, Rassa O. Dale, Roy Darville, John W. McCoy
Tree growth and mortality during 20 years of managing a Green-Tree Reservoir in Arkansas, USA Tree growth and mortality during 20 years of managing a Green-Tree Reservoir in Arkansas, USA
Green-Tree Reservoirs (GTR) are bottomland hardwood forests that are flooded during late fall and winter to provide waterfowl habitat. Early reports suggested that increased moisture improved tree growth and mast production; however, recent reports showed reduced vigor and growth. This study examines the effects of 20 years of GTR management practices in the Felsenthal National Wildlife...
Authors
Bobby D. Keeland, Rassa O. Draugelis-Dale, John W. McCoy
A comparison of litter production in young and old baldcypress (Taxodium distichum L.) stands at Caddo Lake, Texas A comparison of litter production in young and old baldcypress (Taxodium distichum L.) stands at Caddo Lake, Texas
Aboveground primary productivity for cypress forests was assessed from measurements of litter production in two age groups and in two hydrological regimes (standing water and free-flowing). Caddo Lake, located in northeast Texas on the Texas-Louisiana border, offered a unique study site since it is dominated by extensive stands composed entirely of Taxodium distichum (L.) Rich,...
Authors
John W. McCoy, Rassa O. Draugelis-Dale, Bobby D. Keeland, Roy Darville