James Larson
James Larson
Science and Products
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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 Larson, David Staples, Ryan P. Maki, Jon M. Vallazza, Brent Knights, Kevin 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 Larson, S. McCalla, Duane Chapman, Christopher Rees, Brent Knights, Jonathan Vallazza, Amy George, William Richardson, Jon Amberg
Spatial variation in biofouling of a unionid mussel (Lampsilis siliquoidea) across the western basin of Lake Erie Spatial variation in biofouling of a unionid mussel (Lampsilis siliquoidea) across the western basin of Lake Erie
Invasion of North American waters by nonnative Dreissena polymorpha and D. rostriformis bugensishas resulted in declines of the Unionidae family of native North American mussels. Dreissenid mussels biofoul unionid mussels in large numbers and interfere with unionid movement, their acquisition of food, and the native mussels' ability to open and close their shells. Initial expectations...
Authors
James Larson, Mary Evans, William Richardson, Jeff Schaeffer, John Nelson
Measuring spatial variation in secondary production and food quality using a common consumer approach in Lake Erie Measuring spatial variation in secondary production and food quality using a common consumer approach in Lake Erie
Lake Erie is a large lake straddling the border of the U.S. and Canada that has become increasingly eutrophic in recent years. Eutrophication is particularly focused in the shallow western basin. The western basin of Lake Erie is hydrodynamically similar to a large estuary, with riverine inputs from the Detroit and Maumee Rivers mixing together and creating gradients in chemical and...
Authors
James Larson, William Richardson, Mary Evans, Jeff Schaeffer, Timothy Wynne, Michelle Bartsch, Lynn Bartsch, J. C. Nelson, Jon M. Vallazza
Human activities cause distinct dissolved organic matter composition across freshwater ecosystems Human activities cause distinct dissolved organic matter composition across freshwater ecosystems
Dissolved organic matter (DOM) composition in freshwater ecosystems is influenced by interactions between physical, chemical, and biological processes that are controlled, at one level, by watershed landscape, hydrology, and their connections. Against this environmental template, humans may strongly influence DOM composition. Yet, we lack a comprehensive understanding of DOM composition...
Authors
Clayton Williams, Paul Frost, Ana Morales-Williams, James Larson, William Richardson, Aisha Chiandet, Marguerite Xenopoulos
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 Larson, Michelle Bartsch, Steve Gutreuter, Brent Knights, Lynn Bartsch, William Richardson, Jonathan Vallazza, Michael Arts
Science and Products
Filter Total Items: 20
No Result Found
Filter Total Items: 53
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 Larson, David Staples, Ryan P. Maki, Jon M. Vallazza, Brent Knights, Kevin 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 Larson, S. McCalla, Duane Chapman, Christopher Rees, Brent Knights, Jonathan Vallazza, Amy George, William Richardson, Jon Amberg
Spatial variation in biofouling of a unionid mussel (Lampsilis siliquoidea) across the western basin of Lake Erie Spatial variation in biofouling of a unionid mussel (Lampsilis siliquoidea) across the western basin of Lake Erie
Invasion of North American waters by nonnative Dreissena polymorpha and D. rostriformis bugensishas resulted in declines of the Unionidae family of native North American mussels. Dreissenid mussels biofoul unionid mussels in large numbers and interfere with unionid movement, their acquisition of food, and the native mussels' ability to open and close their shells. Initial expectations...
Authors
James Larson, Mary Evans, William Richardson, Jeff Schaeffer, John Nelson
Measuring spatial variation in secondary production and food quality using a common consumer approach in Lake Erie Measuring spatial variation in secondary production and food quality using a common consumer approach in Lake Erie
Lake Erie is a large lake straddling the border of the U.S. and Canada that has become increasingly eutrophic in recent years. Eutrophication is particularly focused in the shallow western basin. The western basin of Lake Erie is hydrodynamically similar to a large estuary, with riverine inputs from the Detroit and Maumee Rivers mixing together and creating gradients in chemical and...
Authors
James Larson, William Richardson, Mary Evans, Jeff Schaeffer, Timothy Wynne, Michelle Bartsch, Lynn Bartsch, J. C. Nelson, Jon M. Vallazza
Human activities cause distinct dissolved organic matter composition across freshwater ecosystems Human activities cause distinct dissolved organic matter composition across freshwater ecosystems
Dissolved organic matter (DOM) composition in freshwater ecosystems is influenced by interactions between physical, chemical, and biological processes that are controlled, at one level, by watershed landscape, hydrology, and their connections. Against this environmental template, humans may strongly influence DOM composition. Yet, we lack a comprehensive understanding of DOM composition...
Authors
Clayton Williams, Paul Frost, Ana Morales-Williams, James Larson, William Richardson, Aisha Chiandet, Marguerite Xenopoulos
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 Larson, Michelle Bartsch, Steve Gutreuter, Brent Knights, Lynn Bartsch, William Richardson, Jonathan Vallazza, Michael Arts