Brent Knights (Former Employee)
Science and Products
Filter Total Items: 50
USGS Integration of New Science and Technology, Appendix A USGS Integration of New Science and Technology, Appendix A
This product summarizes the USGS plans for integration of new science and technology into Asian Carp control efforts for 2017. This includes the 1) implementation and evaluation of new tactics and behavioral information for monitoring, surveillance, control and containment; 2) understanding behavior and reproduction of Asian carp in established and emerging populations to inform...
Authors
Marybeth K. Brey, Brent C. Knights, Aaron R. Cupp, Jon Amberg, Duane Chapman, Robin D. Calfee, James J. Duncker
Spatial and temporal dynamics of suspended particle characteristics and composition in Navigation Pool 19 of the Upper Mississippi River Spatial and temporal dynamics of suspended particle characteristics and composition in Navigation Pool 19 of the Upper Mississippi River
Suspended particles are an essential component of large rivers influencing channel geomorphology, biogeochemical cycling of nutrients, and food web resources. The Upper Mississippi River is a large floodplain river that exhibits pronounced spatiotemporal variation in environmental conditions and biota, providing an ideal environment for investigating dynamics of suspended particles in...
Authors
Amanda S. Milde, William B. Richardson, Eric A. Strauss, James H. Larson, Jonathan M. Vallazza, Brent C. Knights
Do water level fluctuations influence production of walleye and yellow perch young-of-the-year in large northern lakes? Do water level fluctuations influence production of walleye and yellow perch young-of-the-year in large northern lakes?
Many ecological processes depend on the regular rise and fall of water levels (WLs), and artificial manipulations to WL regimes can impair important ecosystem services. Previous research has suggested that differences in WL between late summer and early spring may alter the suitability of shoals used by Walleyes Sander vitreus for spawning. Other species, such as the Yellow Perch Perca...
Authors
James H. Larson, David F. Staples, Ryan P. Maki, Jon M. Vallazza, Brent C. Knights, Kevin E. Peterson
Genetic analysis shows that morphology alone cannot distinguish asian carp eggs from those of other cyprinid species Genetic analysis shows that morphology alone cannot distinguish asian carp eggs from those of other cyprinid species
Fish eggs and embryos (hereafter collectively referred to as “eggs”) were collected in the upper Mississippi River main stem (~300 km upstream of previously reported spawning by invasive Asian carp) during summer 2013. Based on previously published morphological characteristics, the eggs were identified as belonging to Asian carp. A subsample of the eggs was subsequently analyzed by using...
Authors
James H. Larson, S. Grace McCalla, Duane Chapman, Christopher B. Rees, Brent C. Knights, Jonathan M. Vallazza, Amy E. George, William B. Richardson, Jon Amberg
Managing the Mississippi River floodplain: Achieving ecological benefits requires more than hydrological connection to the river: Chapter Managing the Mississippi River floodplain: Achieving ecological benefits requires more than hydrological connection to the river: Chapter
Floodplains are vital to the structure and function of river-floodplain ecosystems. Among the many ecological services provided by floodplains are nutrient cycling and seasonal habitats for fish, including spawning, nursery, foraging and wintering habitats. Connections between the river channel and floodplain habitats are essential to realize these ecological services, but spatial and...
Authors
Harold Schramm, William B. Richardson, Brent C. Knights
Differences between main-channel and off-channel food webs in the upper Mississippi River revealed by fatty acid profiles of consumers Differences between main-channel and off-channel food webs in the upper Mississippi River revealed by fatty acid profiles of consumers
Large river systems are often thought to contain a mosaic of patches with different habitat characteristics driven by differences in flow and mixing environments. Off-channel habitats (e.g., backwater areas, secondary channels) can become semi-isolated from main-channel water inputs, leading to the development of distinct biogeochemical environments. Observations of adult bluegill...
Authors
James H. Larson, Michelle Bartsch, Steve Gutreuter, Brent C. Knights, Lynn Bartsch, William B. Richardson, Jonathan M. Vallazza, Michael T. Arts
Science and Products
Filter Total Items: 50
USGS Integration of New Science and Technology, Appendix A USGS Integration of New Science and Technology, Appendix A
This product summarizes the USGS plans for integration of new science and technology into Asian Carp control efforts for 2017. This includes the 1) implementation and evaluation of new tactics and behavioral information for monitoring, surveillance, control and containment; 2) understanding behavior and reproduction of Asian carp in established and emerging populations to inform...
Authors
Marybeth K. Brey, Brent C. Knights, Aaron R. Cupp, Jon Amberg, Duane Chapman, Robin D. Calfee, James J. Duncker
Spatial and temporal dynamics of suspended particle characteristics and composition in Navigation Pool 19 of the Upper Mississippi River Spatial and temporal dynamics of suspended particle characteristics and composition in Navigation Pool 19 of the Upper Mississippi River
Suspended particles are an essential component of large rivers influencing channel geomorphology, biogeochemical cycling of nutrients, and food web resources. The Upper Mississippi River is a large floodplain river that exhibits pronounced spatiotemporal variation in environmental conditions and biota, providing an ideal environment for investigating dynamics of suspended particles in...
Authors
Amanda S. Milde, William B. Richardson, Eric A. Strauss, James H. Larson, Jonathan M. Vallazza, Brent C. Knights
Do water level fluctuations influence production of walleye and yellow perch young-of-the-year in large northern lakes? Do water level fluctuations influence production of walleye and yellow perch young-of-the-year in large northern lakes?
Many ecological processes depend on the regular rise and fall of water levels (WLs), and artificial manipulations to WL regimes can impair important ecosystem services. Previous research has suggested that differences in WL between late summer and early spring may alter the suitability of shoals used by Walleyes Sander vitreus for spawning. Other species, such as the Yellow Perch Perca...
Authors
James H. Larson, David F. Staples, Ryan P. Maki, Jon M. Vallazza, Brent C. Knights, Kevin E. Peterson
Genetic analysis shows that morphology alone cannot distinguish asian carp eggs from those of other cyprinid species Genetic analysis shows that morphology alone cannot distinguish asian carp eggs from those of other cyprinid species
Fish eggs and embryos (hereafter collectively referred to as “eggs”) were collected in the upper Mississippi River main stem (~300 km upstream of previously reported spawning by invasive Asian carp) during summer 2013. Based on previously published morphological characteristics, the eggs were identified as belonging to Asian carp. A subsample of the eggs was subsequently analyzed by using...
Authors
James H. Larson, S. Grace McCalla, Duane Chapman, Christopher B. Rees, Brent C. Knights, Jonathan M. Vallazza, Amy E. George, William B. Richardson, Jon Amberg
Managing the Mississippi River floodplain: Achieving ecological benefits requires more than hydrological connection to the river: Chapter Managing the Mississippi River floodplain: Achieving ecological benefits requires more than hydrological connection to the river: Chapter
Floodplains are vital to the structure and function of river-floodplain ecosystems. Among the many ecological services provided by floodplains are nutrient cycling and seasonal habitats for fish, including spawning, nursery, foraging and wintering habitats. Connections between the river channel and floodplain habitats are essential to realize these ecological services, but spatial and...
Authors
Harold Schramm, William B. Richardson, Brent C. Knights
Differences between main-channel and off-channel food webs in the upper Mississippi River revealed by fatty acid profiles of consumers Differences between main-channel and off-channel food webs in the upper Mississippi River revealed by fatty acid profiles of consumers
Large river systems are often thought to contain a mosaic of patches with different habitat characteristics driven by differences in flow and mixing environments. Off-channel habitats (e.g., backwater areas, secondary channels) can become semi-isolated from main-channel water inputs, leading to the development of distinct biogeochemical environments. Observations of adult bluegill...
Authors
James H. Larson, Michelle Bartsch, Steve Gutreuter, Brent C. Knights, Lynn Bartsch, William B. Richardson, Jonathan M. Vallazza, Michael T. Arts