Publications
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Performance of human fecal anaerobe-associated PCR-based assays in a multi-laboratory method evaluation study Performance of human fecal anaerobe-associated PCR-based assays in a multi-laboratory method evaluation study
A number of PCR-based methods for detecting human fecal material in environmental waters have been developed over the past decade, but these methods have rarely received independent comparative testing in large multi-laboratory studies. Here, we evaluated ten of these methods (BacH, BacHum-UCD, Bacteroides thetaiotaomicron (BtH), BsteriF1, gyrB, HF183 endpoint, HF183 SYBR, HF183 Taqman®...
Authors
Blythe A. Layton, Yiping Cao, Darcy L. Ebentier, Kaitlyn Hanley, Elisenda Balleste, Joao Brandao, Muruleedhara N. Byappanahalli, Reagan Converse, Andreas H. Farnleitner, Jennifer Gidley Gentry-Shields, Michele Gourmelon, Chang Soo Lee, Jiyoung Lee, Solen Lozach, Tania Madi, Wim G. Meijer, Rachel Noble, Lindsay Peed, Georg H. Reischer, Raquel Rodrigues, Joan B. Rose, Alexander Schriewer, Chris Sinigalliano, Sangeetha Srinivasan, Jill Stewart, C. Laurie, Dan Wang, Richard Whitman, Stefan Wuertz, Jenny Jay, Patricia A. Holden, Alexandria B. Boehm, Orin Shanks, John F. Griffith
Spatial and temporal genetic diversity of lake whitefish (Coregonus clupeaformis (Mitchill)) from Lake Huron and Lake Erie Spatial and temporal genetic diversity of lake whitefish (Coregonus clupeaformis (Mitchill)) from Lake Huron and Lake Erie
Lake whitefish (Coregonus clupeaformis (Mitchill)) are important commercially, culturally, and ecologically in the Laurentian Great Lakes. Stocks of lake whitefish in the Great Lakes have recovered from low levels of abundance in the 1960s. Reductions in abundance, loss of habitat and environmental degradation can be accompanied by losses of genetic diversity and overall fitness that may...
Authors
Wendylee Stott, Mark P. Ebener, Lloyd Mohr, Travis Hartman, Jim Johnson, Edward F. Roseman
Morphometric variation among spawning cisco aggregations in the Laurentian Great Lakes: are historic forms still present? Morphometric variation among spawning cisco aggregations in the Laurentian Great Lakes: are historic forms still present?
Cisco (Coregonus artedi Leseur, formerly lake herring Leucichthys artedi Leseur) populations in each of the Laurentian Great Lakes collapsed between the late 1920s and early 1960s following a multitude of stressors, and never recovered in Lakes Michigan, Erie and Ontario. Prior to their collapse, Koelz (1929) studied Leucichthys spp. in the Great Lakes basin and provided a description of...
Authors
Daniel L. Yule, Seth A. Moore, Mark P. Ebener, Randall M. Claramunt, Thomas C. Pratt, Lorrie L. Salawater, Michael J. Connerton
Trophic shift, not collapse Trophic shift, not collapse
Jerald Schnoor’s editorial describes the recent changes in Lake Huron’s aquatic ecosystem as a trophic collapse and attributes this collapse to invasive species dominating energy and nutrient flows in the food web. As state and federal scientists who are closely monitoring Lake Huron’s food web, we believe that the ongoing changes are more accurately characterized as a trophic shift in...
Authors
Charles P. Madenjian, Edward S. Rutherford, Craig A. Stow, Edward F. Roseman, Ji X. He
Sensitivity of fish density estimates to standard analytical procedures applied to Great Lakes hydroacoustic data Sensitivity of fish density estimates to standard analytical procedures applied to Great Lakes hydroacoustic data
Standardized methods of data collection and analysis ensure quality and facilitate comparisons among systems. We evaluated the importance of three recommendations from the Standard Operating Procedure for hydroacoustics in the Laurentian Great Lakes (GLSOP) on density estimates of target species: noise subtraction; setting volume backscattering strength (Sv) thresholds from user-defined...
Authors
Patrick M. Kocovsky, Lars G. Rudstam, Daniel L. Yule, David M. Warner, Ted Schaner, Bernie Pientka, John W. Deller, Holly A. Waterfield, Larry D. Witzel, Patrick J. Sullivan
Effect of light, prey density, and prey type on the feeding rates of Hemimysis anomala Effect of light, prey density, and prey type on the feeding rates of Hemimysis anomala
Hemimysis anomala is a near-shore mysid native to the Ponto-Caspian region that was discovered to have invaded Great Lakes ecosystems in 2006. We investigated feeding rates and prey preferences of adult and juvenile Hemimysis in laboratory experiments to gain insight on the potential for Hemimysis to disrupt food webs. For both age groups (AGs), we measured feeding rates as a function of...
Authors
Kathleen E. Halpin, Brent T. Boscarino, Lars G. Rudstam, Mureen G. Walsh, Brian F. Lantry
Regulation of a putative corticosteroid, 17, 21-dihydroxypregn-4-ene, 3, 20-one, in sea lamprey, Petromyzon marinus Regulation of a putative corticosteroid, 17, 21-dihydroxypregn-4-ene, 3, 20-one, in sea lamprey, Petromyzon marinus
In higher vertebrates, in response to stress, the hypothalamus produces corticotropin-releasing hormone (CRH), which stimulates cells in the anterior pituitary to produce adrenocorticotropic hormone (ACTH), which in turn stimulates production of either cortisol (F) or corticosterone (B) by the adrenal tissues. In lampreys, however, neither of these steroids is present. Instead, it has...
Authors
Brent W. Roberts, Wes Didier, Satbir Rai, Nicholas S. Johnson, Scot V. Libants, Sang-Seon Yun, David Close
Broad-scale patterns of Brook Trout responses to introduced Brown Trout in New York Broad-scale patterns of Brook Trout responses to introduced Brown Trout in New York
Brook Trout Salvelinus fontinalis and Brown Trout Salmo trutta are valuable sport fish that coexist in many parts of the world due to stocking introductions. Causes for the decline of Brook Trout within their native range are not clear but include competition with Brown Trout, habitat alteration, and repetitive stocking practices. New York State contains a large portion of the Brook...
Authors
James E. McKenna, Michael T. Slattery, Kean M. Clifford
Habitat heterogeneity and intraguild interactions modify distribution and injury rates in two coexisting genera of damselflies Habitat heterogeneity and intraguild interactions modify distribution and injury rates in two coexisting genera of damselflies
1. Sublethal effects of predation can affect both population and community structure. Despite this, little is known about how the frequency of injury varies in relation to habitat, aquatic community characteristics or between trophically similar, coexisting taxa. 2. In a tidal freshwater ecosystem, we first examined injuries (lamellar autotomy) of Enallagma and Ischnura damselfly larvae...
Authors
Jonathan W. Witt, Rebecca E. Forkner, Richard T. Kraus
Ups and Downs of Burbot and their predator Lake Trout in Lake Superior, 1953-2011 Ups and Downs of Burbot and their predator Lake Trout in Lake Superior, 1953-2011
The fish community of Lake Superior has undergone a spectacular cycle of decline and recovery over the past 60 years. A combination of Sea Lamprey Petromyzon marinus depredation and commercial overfishing resulted in severe declines in Lake Trout Salvelinus namaycush, which served as the primary top predator of the community. Burbot Lota lota populations also declined as a result of Sea...
Authors
Owen T. Gorman, Shawn P. Sitar
Temporal changes and sexual differences in spatial distribution of Burbot in Lake Erie Temporal changes and sexual differences in spatial distribution of Burbot in Lake Erie
We used GIS mapping techniques to examine capture data for Burbot Lota lota from annual gill-net surveys in Canadian waters of Lake Erie during late August and September 1994–2011. Adult males were captured over a larger area (3–17% for ≥20% maximum yearly catch [MYC]) than adult females. More males than females were caught in the gill nets in 14 of the 15 study years. Collectively...
Authors
Martin A. Stapanian, Larry D. Witzel, Andy Cook
Changing ecosystem dynamics in the Laurentian Great Lakes: Bottom-up and top-down regulation Changing ecosystem dynamics in the Laurentian Great Lakes: Bottom-up and top-down regulation
Understanding the relative importance of top-down and bottom-up regulation of ecosystem structure is a fundamental ecological question, with implications for fisheries and water-quality management. For the Laurentian Great Lakes, where, since the early 1970s, nutrient inputs have been reduced, whereas top-predator biomass has increased, we describe trends across multiple trophic levels...
Authors
David B. Bunnell, Richard P Barbiero, Stuart A Ludsin, Charles P. Madenjian, Glenn J. Warren, David M. Dolan, Travis O. Brenden, Ruth Briland, Owen T. Gorman, Ji X. Hi, Thomas F. Johengen, Brian F. Lantry, Barry M. Lesht, Thomas F. Nalepa, Stephen C. Riley, Catherine M. Riseng, Ted J. Treska, Iyob Tsehaye, Maureen Walsh, David M. Warner, Brian Weidel