James Larson
James Larson
Science and Products
Filter Total Items: 44
Preliminary analysis to estimate the spatial distribution of benefits of P load reduction: Identifying the spatial influence of phosphorus loading from the Maumee River (USA) in western Lake Erie
Since the early 2000s, Lake Erie has been experiencing annual cyanobacterial blooms that often cover large portions of the western basin and even reach into the central basin. These blooms have affected several ecosystem services provided by Lake Erie to surrounding communities (notably drinking water quality). Several modeling efforts have identified the springtime total bioavailable phosphorus (
Authors
James H. Larson, Enrika Hlavacek, Nathan R. De Jager, Mary Anne Evans, Timothy Wynne
Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)
Transitional areas between ecosystem types are often active biogeochemically due to resource limitation changes. Lotic-to-lentic transitions in freshwaters appear active biogeochemically, but few studies have directly measured nutrient processing rates to assess whether processing within the rivermouth is important for load estimates or the local communities. We measured oxic fluxes of inorganic n
Authors
James H. Larson, William F. James, Faith A. Fitzpatrick, Paul C. Frost, Mary Anne Evans, Paul C. Reneau, Marguerite A. Xenopoulos
Estimating the degree to which distance and temperature differences drive changes in fish community composition over time in the upper Mississippi River
Similarity in community composition declines as distance between locations increases, a phenomenon that has been observed in a wide variety of freshwater, marine and terrestrial ecosystems. One driver of the distance-similarity relationship is the presence of environmental gradients that alter the suitability of sites for particular species. Although some environmental gradients, such as geology
Authors
James H. Larson, Jonathan M. Vallazza, Brent C. Knights
Influence of a high-head dam as a dispersal barrier to fish community structure of the Upper Mississippi River
In river systems, high‐head dams may increase the distance‐decay of fish community similarity by creating nearly impermeable dispersal barriers to certain species from upstream reaches. Substantial evidence suggests that migratory species are impacted by dams, and most previous studies in stream/river networks have focused on small streams and headwaters. Here, we assess whether a high‐head dam (L
Authors
Rebekah L. Anderson, Cory A. Anderson, James H. Larson, Brent C. Knights, Jonathan M. Vallazza, Sean E. Jenkins, James T. Lamer
Seasonal patterns in hydrochemical mixing in three Great Lakes rivermouth ecosystems
Rivermouth ecosystems in the Laurentian Great Lakes represent complex hydrologic mixing zones where lake and river water combine to form biologically productive areas that are functionally similar to marine estuaries. As urban, industrial, shipping, and recreational centers, rivermouths are the focus of human interactions with the Great Lakes and, likewise, may represent critical habitat for larva
Authors
Martha Carlson-Mazur, Jeff Schaeffer, Jennifer E. Granneman, Natalie Goldstrohm, Faith A. Fitzpatrick, James H. Larson, Paul Reneau, Kurt P. Kowalski, Paul W. Seelbach
Precipitation and temperature drive continental scale patterns in stream invertebrate production
Secondary production, the growth of new heterotrophic biomass, is a key process in aquatic and terrestrial ecosystems that has been carefully measured in many flowing water ecosystems. We combine structural equation modeling with the first worldwide dataset on annual secondary production of stream invertebrate communities to reveal core pathways linking air temperature and precipitation to seconda
Authors
Christopher J. Patrick, D. McGarvey, James H. Larson, W. Cross, D. Allen, A. Benke, T. Brey, A. Huryn, J. Douglas Jones, C. Murphy, C. Ruffing, P. Saffarinia, M. Whiles, B. P. Wallace, G. Woodward
Top-down effect of repatriating bald eagles hinder jointly recovering competitors
1. The recovery of piscivorous birds around the world is touted as one of the great conservation successes of the 21st century, but for some species, this success was short-lived. Bald eagles, ospreys, and great blue herons began repatriating Voyageurs National Park, USA, in the mid-20th century. However, after 1990, only eagles continued their recovery, while osprey and heron recovery failed for
Authors
Jennyffer Cruz, Steve K. Windels, Wayne E. Thogmartin, Shawn M. Crimmins, Leland H. Grim, James H. Larson, Benjamin Zuckerberg
Development of a quantitative PCR method for screening ichthyoplankton samples for bigheaded carps
Monitoring ichthyoplankton is useful for identifying reproductive fronts and spawning locations of bigheaded carps (Hypophthalmichthys spp.). Unfortunately, sorting and identifying ichthyoplankton to monitor for bigheaded carp reproduction is time consuming and expensive. Traditional methods require frequent egg-larvae sampling, sorting of all samples to obtain presumptively identified bigheaded c
Authors
Andrea K. Fritts, Brent C. Knights, James H. Larson, Jon Amberg, Christopher M. Merkes, Tariq Tajjioui, Steven E. Butler, Matthew J. Diana, David H. Wahl, Michael J. Weber, John D. Waters
Water column nutrient processing rates in rivermouths of Green Bay (Lake Michigan)
Understanding the quantity and form of nutrient loads to large lakes is necessary to understand controls over primary production, phytoplankton community composition and the production of phytotoxins. Nutrient loading estimates to large lakes are primarily made at stream gages that are deliberately placed outside the direct influence of lake processes, but these estimates cannot take into account
Authors
James H. Larson, Mary Anne Evans, Faith A. Fitzpatrick, Paul C. Frost, Sean Bailey, Robert J. Kennedy, William F. James, William B. Richardson, Paul C. Reneau
Before-after, control-impact analysis of evidence for the impacts of water level on Walleye, Northern Pike and Yellow Perch in lakes of the Rainy-Namakan complex (MN, USA and ON, CA)
Water level (WL) fluctuations in lakes influence many aspects of ecosystem processes.
Concern about the potential impact of WL fluctuations on fisheries was one of the factors
that motivated the decision in 2000 to alter the management of WL in the Rainy-Namakan
reservoir complex (on the border between the U.S. state of Minnesota and the Canadian
province of Ontario). We used a Before-After, Contr
Authors
James H. Larson, Ryan P. Maki, Benjamin A. Vondra, Kevin E. Peterson
Associations between cyanobacteria and indices of secondary production in the western basin of Lake Erie
Large lakes provide a variety of ecological services to surrounding cities and communities. Many of these services are supported by ecological processes that are threatened by the increasing prevalence of cyanobacterial blooms which occur as aquatic ecosystems experience cultural eutrophication. Over the past 10 yr, Lake Erie experienced cyanobacterial blooms of increasing severity and frequency,
Authors
James H. Larson, Mary Anne Evans, Robert J. Kennedy, Sean Bailey, Keith A. Loftin, Zachary Laughrey, Robin Femmer, Jeff Schaeffer, William B. Richardson, Timothy Wynne, J. C. Nelson, Joseph W. Duris
Evidence of Asian carp spawning upstream of a key choke point in the Mississippi River
Bighead Carp Hypophthalmichthys nobilis, Silver Carp H. molitrix, and Grass Carp Ctenopharyngodon idella(collectively termed “Asian carp”) were introduced into North America during the 1960s and 1970s and have become established in the lower Mississippi River basin. Previously published evidence for spawning of these species in the upper Mississippi River has been limited to an area just downstrea
Authors
James H. Larson, Brent C. Knights, S. Grace McCalla, Emy Monroe, Maren T. Tuttle-Lau, Duane Chapman, Amy E. George, Jonathan M. Vallazza, Jon Amberg
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Filter Total Items: 44
Preliminary analysis to estimate the spatial distribution of benefits of P load reduction: Identifying the spatial influence of phosphorus loading from the Maumee River (USA) in western Lake Erie
Since the early 2000s, Lake Erie has been experiencing annual cyanobacterial blooms that often cover large portions of the western basin and even reach into the central basin. These blooms have affected several ecosystem services provided by Lake Erie to surrounding communities (notably drinking water quality). Several modeling efforts have identified the springtime total bioavailable phosphorus (AuthorsJames H. Larson, Enrika Hlavacek, Nathan R. De Jager, Mary Anne Evans, Timothy WynnePhosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)
Transitional areas between ecosystem types are often active biogeochemically due to resource limitation changes. Lotic-to-lentic transitions in freshwaters appear active biogeochemically, but few studies have directly measured nutrient processing rates to assess whether processing within the rivermouth is important for load estimates or the local communities. We measured oxic fluxes of inorganic nAuthorsJames H. Larson, William F. James, Faith A. Fitzpatrick, Paul C. Frost, Mary Anne Evans, Paul C. Reneau, Marguerite A. XenopoulosEstimating the degree to which distance and temperature differences drive changes in fish community composition over time in the upper Mississippi River
Similarity in community composition declines as distance between locations increases, a phenomenon that has been observed in a wide variety of freshwater, marine and terrestrial ecosystems. One driver of the distance-similarity relationship is the presence of environmental gradients that alter the suitability of sites for particular species. Although some environmental gradients, such as geologyAuthorsJames H. Larson, Jonathan M. Vallazza, Brent C. KnightsInfluence of a high-head dam as a dispersal barrier to fish community structure of the Upper Mississippi River
In river systems, high‐head dams may increase the distance‐decay of fish community similarity by creating nearly impermeable dispersal barriers to certain species from upstream reaches. Substantial evidence suggests that migratory species are impacted by dams, and most previous studies in stream/river networks have focused on small streams and headwaters. Here, we assess whether a high‐head dam (LAuthorsRebekah L. Anderson, Cory A. Anderson, James H. Larson, Brent C. Knights, Jonathan M. Vallazza, Sean E. Jenkins, James T. LamerSeasonal patterns in hydrochemical mixing in three Great Lakes rivermouth ecosystems
Rivermouth ecosystems in the Laurentian Great Lakes represent complex hydrologic mixing zones where lake and river water combine to form biologically productive areas that are functionally similar to marine estuaries. As urban, industrial, shipping, and recreational centers, rivermouths are the focus of human interactions with the Great Lakes and, likewise, may represent critical habitat for larvaAuthorsMartha Carlson-Mazur, Jeff Schaeffer, Jennifer E. Granneman, Natalie Goldstrohm, Faith A. Fitzpatrick, James H. Larson, Paul Reneau, Kurt P. Kowalski, Paul W. SeelbachPrecipitation and temperature drive continental scale patterns in stream invertebrate production
Secondary production, the growth of new heterotrophic biomass, is a key process in aquatic and terrestrial ecosystems that has been carefully measured in many flowing water ecosystems. We combine structural equation modeling with the first worldwide dataset on annual secondary production of stream invertebrate communities to reveal core pathways linking air temperature and precipitation to secondaAuthorsChristopher J. Patrick, D. McGarvey, James H. Larson, W. Cross, D. Allen, A. Benke, T. Brey, A. Huryn, J. Douglas Jones, C. Murphy, C. Ruffing, P. Saffarinia, M. Whiles, B. P. Wallace, G. WoodwardTop-down effect of repatriating bald eagles hinder jointly recovering competitors
1. The recovery of piscivorous birds around the world is touted as one of the great conservation successes of the 21st century, but for some species, this success was short-lived. Bald eagles, ospreys, and great blue herons began repatriating Voyageurs National Park, USA, in the mid-20th century. However, after 1990, only eagles continued their recovery, while osprey and heron recovery failed forAuthorsJennyffer Cruz, Steve K. Windels, Wayne E. Thogmartin, Shawn M. Crimmins, Leland H. Grim, James H. Larson, Benjamin ZuckerbergDevelopment of a quantitative PCR method for screening ichthyoplankton samples for bigheaded carps
Monitoring ichthyoplankton is useful for identifying reproductive fronts and spawning locations of bigheaded carps (Hypophthalmichthys spp.). Unfortunately, sorting and identifying ichthyoplankton to monitor for bigheaded carp reproduction is time consuming and expensive. Traditional methods require frequent egg-larvae sampling, sorting of all samples to obtain presumptively identified bigheaded cAuthorsAndrea K. Fritts, Brent C. Knights, James H. Larson, Jon Amberg, Christopher M. Merkes, Tariq Tajjioui, Steven E. Butler, Matthew J. Diana, David H. Wahl, Michael J. Weber, John D. WatersWater column nutrient processing rates in rivermouths of Green Bay (Lake Michigan)
Understanding the quantity and form of nutrient loads to large lakes is necessary to understand controls over primary production, phytoplankton community composition and the production of phytotoxins. Nutrient loading estimates to large lakes are primarily made at stream gages that are deliberately placed outside the direct influence of lake processes, but these estimates cannot take into accountAuthorsJames H. Larson, Mary Anne Evans, Faith A. Fitzpatrick, Paul C. Frost, Sean Bailey, Robert J. Kennedy, William F. James, William B. Richardson, Paul C. ReneauBefore-after, control-impact analysis of evidence for the impacts of water level on Walleye, Northern Pike and Yellow Perch in lakes of the Rainy-Namakan complex (MN, USA and ON, CA)
Water level (WL) fluctuations in lakes influence many aspects of ecosystem processes. Concern about the potential impact of WL fluctuations on fisheries was one of the factors that motivated the decision in 2000 to alter the management of WL in the Rainy-Namakan reservoir complex (on the border between the U.S. state of Minnesota and the Canadian province of Ontario). We used a Before-After, ContrAuthorsJames H. Larson, Ryan P. Maki, Benjamin A. Vondra, Kevin E. PetersonAssociations between cyanobacteria and indices of secondary production in the western basin of Lake Erie
Large lakes provide a variety of ecological services to surrounding cities and communities. Many of these services are supported by ecological processes that are threatened by the increasing prevalence of cyanobacterial blooms which occur as aquatic ecosystems experience cultural eutrophication. Over the past 10 yr, Lake Erie experienced cyanobacterial blooms of increasing severity and frequency,AuthorsJames H. Larson, Mary Anne Evans, Robert J. Kennedy, Sean Bailey, Keith A. Loftin, Zachary Laughrey, Robin Femmer, Jeff Schaeffer, William B. Richardson, Timothy Wynne, J. C. Nelson, Joseph W. DurisEvidence of Asian carp spawning upstream of a key choke point in the Mississippi River
Bighead Carp Hypophthalmichthys nobilis, Silver Carp H. molitrix, and Grass Carp Ctenopharyngodon idella(collectively termed “Asian carp”) were introduced into North America during the 1960s and 1970s and have become established in the lower Mississippi River basin. Previously published evidence for spawning of these species in the upper Mississippi River has been limited to an area just downstreaAuthorsJames H. Larson, Brent C. Knights, S. Grace McCalla, Emy Monroe, Maren T. Tuttle-Lau, Duane Chapman, Amy E. George, Jonathan M. Vallazza, Jon Amberg