Publications
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Mercury elimination rates for adult northern pike Esox lucius: evidence for a sex effect Mercury elimination rates for adult northern pike Esox lucius: evidence for a sex effect
We examined the effect of sex on mercury elimination in fish by monitoring isotope-enriched mercury concentrations in the muscle tissue of three adult female and three adult male northern pike Esox lucius, which had accumulated the isotope-enriched mercury via a whole-lake manipulation and were subsequently moved to a clean lake. Mercury elimination rates for female and male northern...
Authors
Charles P. Madenjian, Paul J. Blanchfield, Lee E. Hrenchuk, Jillian L. A. Van Walleghem
Ecological tracers reveal resource convergence among prey fish species in a large lake ecosystem Ecological tracers reveal resource convergence among prey fish species in a large lake ecosystem
1. We measured stable isotopes of carbon (δ13C) and nitrogen (δ15N) and fatty acid profiles in Lake Ontario alewife ( Alosa pseudoharengus), rainbow smelt ( Osmerus mordax), slimy sculpin ( Cottus cognatus) and round goby ( Neogobius melanostomus) collected from 1982 to 2008 to investigate how temporal variability in these ecological tracers can relate to ecosystem-level changes...
Authors
Gord Paterson, Scott A. Rush, Michael T. Arts, Ken G. Drouillard, G. Doug Haffner, Tim B. Johnson, Brian F. Lantry, Craig E. Hebert, Daryl J. McGoldrick, Sean M. Backus, Aaron T. Fisk
Sampling little fish in big rivers: Larval fish detection probabilities in two Lake Erie tributaries and implications for sampling effort and abundance indices Sampling little fish in big rivers: Larval fish detection probabilities in two Lake Erie tributaries and implications for sampling effort and abundance indices
Larval fish are frequently sampled in coastal tributaries to determine factors affecting recruitment, evaluate spawning success, and estimate production from spawning habitats. Imperfect detection of larvae is common, because larval fish are small and unevenly distributed in space and time, and coastal tributaries are often large and heterogeneous. We estimated detection probabilities of...
Authors
Jeremy J. Pritt, Mark R. DuFour, Christine M. Mayer, Edward F. Roseman, Robin L. DeBruyne
Modeling turbidity type and intensity effects on the growth and starvation mortality of age-0 yellow perch Modeling turbidity type and intensity effects on the growth and starvation mortality of age-0 yellow perch
We sought to quantify the possible population-level influence of sediment plumes and algal blooms on yellow perch (Perca flavescens), a visual predator found in systems with dynamic water clarity. We used an individual-based model (IBM), which allowed us to include variance in water clarity and the distribution of individual sizes. Our IBM was built with laboratory data showing that...
Authors
Nathan M Manning, Jonathan M. Bossenbroek, Christine M. Mayer, David B. Bunnell, Jeff T. Tyson, Lars G. Rudstam, James R. Jackson
Assessing and addressing the re-eutrophication of Lake Erie: central basin hypoxia Assessing and addressing the re-eutrophication of Lake Erie: central basin hypoxia
Relieving phosphorus loading is a key management tool for controlling Lake Erie eutrophication. During the 1960s and 1970s, increased phosphorus inputs degraded water quality and reduced central basin hypolimnetic oxygen levels which, in turn, eliminated thermal habitat vital to cold-water organisms and contributed to the extirpation of important benthic macroinvertebrate prey species...
Authors
Donald Scavia, J. David Allan, Kristin K. Arend, Steven Bartell, Dmitry Beletsky, Nate S. Bosch, Stephen B. Brandt, Ruth D. Briland, Irem Daloglu, Joseph V. DePinto, David M. Dolan, Mary Anne Evans, Troy M. Farmer, Daisuke Goto, Haejin Han, Tomas O. Hook, Roger Knight, Stuart A. Ludsin, Doran Mason, Anna M. Michalak, R. Peter Richards, James Roberts, Daniel K. Rucinski, Edward Rutherford, David J. Schwab, Timothy M. Sesterhenn, Hongyan Zhang, Yuntao Zhou
Males exceed females in PCB concentrations of cisco (Coregonus artedi) from Lake Superior Males exceed females in PCB concentrations of cisco (Coregonus artedi) from Lake Superior
We determined whole-fish polychlorinated biphenyl (PCB) concentrations of 25 male and 25 female age-7 ciscoes (Coregonus artedi) captured from a spawning aggregation in Thunder Bay, Lake Superior, during November 2010. We also determined PCB concentrations in the ovaries and somatic tissue of five additional female ciscoes (ages 5–22). All 55 of these ciscoes were in ripe or nearly ripe...
Authors
Charles P. Madenjian, Daniel L. Yule, Sergei M. Chernyak, Linda J. Begnoche, Eric K. Berglund, Edmund J. Isaac
Coastal geology and recent origins for Sand Point, Lake Superior Coastal geology and recent origins for Sand Point, Lake Superior
Sand Point is a small cuspate foreland located along the southeastern shore of Lake Superior within Pictured Rocks National Lakeshore near Munising, Michigan. Park managers’ concerns for the integrity of historic buildings at the northern periphery of the point during the rising lake levels in the mid-1980s greatly elevated the priority of research into the geomorphic history and age of...
Authors
Timothy G. Fisher, David E. Krantz, Mario R. Castaneda, Walter L. Loope, Harry M. Jol, Ronald J. Goble, Melinda C. Higley, Samantha DeWald, Paul Hansen
Effects of recruitment, growth, and exploitation on walleye population size structure in northern Wisconsin lakes Effects of recruitment, growth, and exploitation on walleye population size structure in northern Wisconsin lakes
We evaluated the dynamics of walleye Sander vitreus population size structure, as indexed by the proportional size distribution (PSD) of quality-length fish, in Escanaba Lake during 1967–2003 and in 204 other lakes in northern Wisconsin during 1990–2011. We estimated PSD from angler-caught walleyes in Escanaba Lake and from spring electrofishing in 204 other lakes, and then related PSD...
Authors
Michael J. Hansen, Nancy A. Nate
Reproductive ecology of lampreys Reproductive ecology of lampreys
Lampreys typically spawn in riffle habitats during the spring. Spawning activity and diel (i.e., during daylight and at night) behavioral patterns are initiated when spring water temperatures increase to levels that coincide with optimal embryologic development. Nests are constructed in gravel substrate using the oral disc to move stones and the tail to fan sediment out of the nest...
Authors
Nicholas S. Johnson, Tyler J. Buchinger, Weiming Li
2014 Gulf of Mexico Hypoxia Forecast 2014 Gulf of Mexico Hypoxia Forecast
The Gulf of Mexico annual summer hypoxia forecasts are based on average May total nitrogen loads from the Mississippi River basin for that year. The load estimate, recently released by USGS, is 4,761 metric tons per day. Based on that estimate, we predict the area of this summer’s hypoxic zone to be 14,000 square kilometers (95% credible interval, 8,000 to 20,000) – an “average year”...
Authors
Donald Scavia, Mary Anne Evans, Dan Obenour
Chesapeake Bay hypoxic volume forecasts and results: June 10, 2014 Chesapeake Bay hypoxic volume forecasts and results: June 10, 2014
The 2014 Forecast - Given the average Jan-May 2014 total nitrogen load of 200,165 kg/day, this summer’s hypoxia volume forecast is 8.2 km3, slightly larger than average size for the period of record and the observed size last year.
Authors
Donald Scavia, Mary Anne Evans
A new clarification method to visualize biliary degeneration during liver metamorphosis in sea lamprey (Petromyzon marinus) A new clarification method to visualize biliary degeneration during liver metamorphosis in sea lamprey (Petromyzon marinus)
Biliary atresia is a rare disease of infancy, with an estimated 1 in 15,000 frequency in the southeast United States, but more common in East Asian countries, with a reported frequency of 1 in 5,000 in Taiwan. Although much is known about the management of biliary atresia, its pathogenesis is still elusive. The sea lamprey (Petromyzon marinus) provides a unique opportunity to examine the...
Authors
Yu-Wen Chung-Davidson, Peter J. Davidson, Anne M. Scott, Erin J. Walaszczyk, Cory O. Brant, Tyler Buchinger, Nicholas S. Johnson, Weiming Li