William Richardson (Former Employee)
Science and Products
Filter Total Items: 33
Rivermouth alteration of agricultural impacts on consumer tissue δ15N
Terrestrial agricultural activities strongly influence riverine nitrogen (N) dynamics, which is reflected in the δ15N of riverine consumer tissues. However, processes within aquatic ecosystems also influence consumer tissue δ15N. As aquatic processes become more important terrestrial inputs may become a weaker predictor of consumer tissue δ15N. In a previous study, this terrestrial-consumer tissue
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
Wetland management reduces sediment and nutrient loading to the upper Mississippi River
Restored riparian wetlands in the Upper Mississippi River basin have potential to remove sediment and nutrients from tributaries before they flow into the Mississippi River. For 3 yr we calculated retention efficiencies of a marsh complex, which consisted of a restored marsh and an adjacent natural marsh that were connected to Halfway Creek, a small tributary of the Mississippi. We measured sedime
Authors
Rebecca M. Kreiling, Joseph P. Schubauer-Berigan, William B. Richardson, Lynn Bartsch, Peter E. Hughes, Eric A. Strauss
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were measured from a range of rivermouths syste
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
Summer nitrate uptake and denitrification in an upper Mississippi River backwater lake: The role of rooted aquatic vegetation
In-stream nitrogen processing in the Mississippi River has been suggested as one mechanism to reduce coastal eutrophication in the Gulf of Mexico. Aquatic macrophytes in river channels and flood plain lakes have the potential to temporarily remove large quantities of nitrogen through assimilation both by themselves and by the attached epiphyton. In addition, rooted macrophytes act as oxygen pumps,
Authors
Rebecca Kreiling, William B. Richardson, J.C. Cavanaugh, Lynn Bartsch
Seasonal effects of the zebra mussel (Dreissena polymorpha) on sediment denitrification rates in Pool 8 of the Upper Mississippi River
Zebra mussels (Dreissena polymorpha) have altered the structure of invaded ecosystems and exhibit characteristics that suggest they may influence ecosystem processes such as nitrogen (N) cycling. We measured denitrification rates seasonally on sediments underlying zebra mussel beds collected from the impounded zone of Navigation Pool 8 of the Upper Mississippi River. Denitrification assays were am
Authors
Denise A. Bruesewitz, Jennifer L. Tank, Melody J. Bernot, William B. Richardson, Eric A. Strauss
Nitrogen dynamics in sediment during water level manipulation on the Upper Mississippi River
Nitrogen (N) has been linked to increasing eutrophication in the Gulf of Mexico and as a result there is increased interest in managing and improving water quality in the Mississippi River system. Water level reductions, or 'drawdowns', are being used more frequently in large river impoundments to improve vegetation growth and sediment compaction. We selected two areas of the Upper Mississippi Riv
Authors
Jennifer C. Cavanaugh, William B. Richardson, Eric A. Strauss, Lynn Bartsch
Effects of ammonia on juvenile unionid mussels (Lampsilis cardium) in laboratory sediment toxicity tests
Ammonia is a relatively toxic compound generated in water and sediments by heterotrophic bacteria and accumulates in sediments and pore water. Recent data suggest that unionid mussels are sensitive to un-ionized ammonia (NH3) relative to other organisms. Existing sediment exposure systems are not suitable for ammonia toxicity studies with juvenile unionids; thus, we modified a system to expose juv
Authors
Teresa J. Newton, John W. Allran, Jonathan A. O'Donnell, Michelle Bartsch, William B. Richardson
Effects of pore‐water ammonia on in situ survival and growth of juvenile mussels (;Lampsilis cardium); in the St. Croix Riverway, Wisconsin, USA
We conducted a series of in situ tests to evaluate the effects of pore‐water ammonia on juvenile Lampsilis cardium in the St. Croix River (WI, USA). Threats to this river and its associated unionid fauna have accelerated in recent years because of its proximity to Minneapolis–St. Paul, Minnesota, USA. In 2000, caged juveniles were exposed to sediments and overlying water at 12 sites for 10 d. Surv
Authors
Michelle Bartsch, Teresa J. Newton, John W. Allran, Jonathan A. O'Donnell, William B. Richardson
Complex interactions of multiple aquatic consumers: an experimental mesocosm manipulation
In 7-m3 outdoor tanks filled with lake water, the presence/absence of omnivorous young-of-the- year Micropterus salmoides), zooplanktivorous Menidia beryllina , and herbivorous larval Hyla chrysocelis was experimentally manipulated. A cross-classified design was used to assess the interactive effects of these vertebrate consumers on the experimental food webs. The primary effects of the experim
Authors
William B. Richardson, Stephen T. Threlkeld
Science and Products
Filter Total Items: 33
Rivermouth alteration of agricultural impacts on consumer tissue δ15N
Terrestrial agricultural activities strongly influence riverine nitrogen (N) dynamics, which is reflected in the δ15N of riverine consumer tissues. However, processes within aquatic ecosystems also influence consumer tissue δ15N. As aquatic processes become more important terrestrial inputs may become a weaker predictor of consumer tissue δ15N. In a previous study, this terrestrial-consumer tissue
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
Wetland management reduces sediment and nutrient loading to the upper Mississippi River
Restored riparian wetlands in the Upper Mississippi River basin have potential to remove sediment and nutrients from tributaries before they flow into the Mississippi River. For 3 yr we calculated retention efficiencies of a marsh complex, which consisted of a restored marsh and an adjacent natural marsh that were connected to Halfway Creek, a small tributary of the Mississippi. We measured sedime
Authors
Rebecca M. Kreiling, Joseph P. Schubauer-Berigan, William B. Richardson, Lynn Bartsch, Peter E. Hughes, Eric A. Strauss
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were measured from a range of rivermouths syste
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
Summer nitrate uptake and denitrification in an upper Mississippi River backwater lake: The role of rooted aquatic vegetation
In-stream nitrogen processing in the Mississippi River has been suggested as one mechanism to reduce coastal eutrophication in the Gulf of Mexico. Aquatic macrophytes in river channels and flood plain lakes have the potential to temporarily remove large quantities of nitrogen through assimilation both by themselves and by the attached epiphyton. In addition, rooted macrophytes act as oxygen pumps,
Authors
Rebecca Kreiling, William B. Richardson, J.C. Cavanaugh, Lynn Bartsch
Seasonal effects of the zebra mussel (Dreissena polymorpha) on sediment denitrification rates in Pool 8 of the Upper Mississippi River
Zebra mussels (Dreissena polymorpha) have altered the structure of invaded ecosystems and exhibit characteristics that suggest they may influence ecosystem processes such as nitrogen (N) cycling. We measured denitrification rates seasonally on sediments underlying zebra mussel beds collected from the impounded zone of Navigation Pool 8 of the Upper Mississippi River. Denitrification assays were am
Authors
Denise A. Bruesewitz, Jennifer L. Tank, Melody J. Bernot, William B. Richardson, Eric A. Strauss
Nitrogen dynamics in sediment during water level manipulation on the Upper Mississippi River
Nitrogen (N) has been linked to increasing eutrophication in the Gulf of Mexico and as a result there is increased interest in managing and improving water quality in the Mississippi River system. Water level reductions, or 'drawdowns', are being used more frequently in large river impoundments to improve vegetation growth and sediment compaction. We selected two areas of the Upper Mississippi Riv
Authors
Jennifer C. Cavanaugh, William B. Richardson, Eric A. Strauss, Lynn Bartsch
Effects of ammonia on juvenile unionid mussels (Lampsilis cardium) in laboratory sediment toxicity tests
Ammonia is a relatively toxic compound generated in water and sediments by heterotrophic bacteria and accumulates in sediments and pore water. Recent data suggest that unionid mussels are sensitive to un-ionized ammonia (NH3) relative to other organisms. Existing sediment exposure systems are not suitable for ammonia toxicity studies with juvenile unionids; thus, we modified a system to expose juv
Authors
Teresa J. Newton, John W. Allran, Jonathan A. O'Donnell, Michelle Bartsch, William B. Richardson
Effects of pore‐water ammonia on in situ survival and growth of juvenile mussels (;Lampsilis cardium); in the St. Croix Riverway, Wisconsin, USA
We conducted a series of in situ tests to evaluate the effects of pore‐water ammonia on juvenile Lampsilis cardium in the St. Croix River (WI, USA). Threats to this river and its associated unionid fauna have accelerated in recent years because of its proximity to Minneapolis–St. Paul, Minnesota, USA. In 2000, caged juveniles were exposed to sediments and overlying water at 12 sites for 10 d. Surv
Authors
Michelle Bartsch, Teresa J. Newton, John W. Allran, Jonathan A. O'Donnell, William B. Richardson
Complex interactions of multiple aquatic consumers: an experimental mesocosm manipulation
In 7-m3 outdoor tanks filled with lake water, the presence/absence of omnivorous young-of-the- year Micropterus salmoides), zooplanktivorous Menidia beryllina , and herbivorous larval Hyla chrysocelis was experimentally manipulated. A cross-classified design was used to assess the interactive effects of these vertebrate consumers on the experimental food webs. The primary effects of the experim
Authors
William B. Richardson, Stephen T. Threlkeld