David M Warner, PhD (Former Employee)
Science and Products
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Filter Total Items: 53
Describing the distribution and productivity of biota along a nearshore to offshore gradient Describing the distribution and productivity of biota along a nearshore to offshore gradient
The Lake Michigan Lakewide Action and Management Plan (LAMP) proposed adding nutrients (phosphorus) to its “pollutant of concern” list in 2002, given that excessive nutrients were causing impairments in nearshore waters. Since that time, scientists have highlighted the “shunting” of nutrients to the nearshore (Hecky et al. 2004), owing to the ability of invasive dreissenid mussels to...
Authors
David B. Bunnell, Patricia M. Dieter, David M. Warner, Lauren A. Eaton, Drew Eppehimer
Status of pelagic prey fishes in Lake Michigan, 2017 Status of pelagic prey fishes in Lake Michigan, 2017
Acoustic surveys were conducted in late summer/early fall during the years 1992-1996 and 2001-2017 to estimate pelagic prey fish biomass in Lake Michigan. Midwater trawling during the surveys as well as target strength provided a measure of species and size composition of the fish community for use in scaling acoustic data and providing species-specific abundance estimates. The 2017...
Authors
David M. Warner, Ben Turscah, Dale Hanson, Timothy J. Desorcie, Timothy P. O’Brien, Patricia M. Dieter, Jason Smith
Are changes in lower trophic levels limiting prey-fish biomass and production in Lake Michigan? Are changes in lower trophic levels limiting prey-fish biomass and production in Lake Michigan?
To improve understanding of how recent changes in lower trophic levels in Lake Michigan could be affecting prey-fish biomass and production, the Lake Michigan Committee (LMC) convened a Lower Trophic Level Task Group and provided several charges that are responded to in this report. First, we compiled a comprehensive summary of lower trophiclevel data in Lake Michigan, separating out...
Authors
David B. Bunnell, Hunter J. Carrick, Charles P. Madenjian, Edward S. Rutherford, Henry A. Vanderploeg, Richard P. Barbiero, Elizabeth Hinchey-Malloy, Steven A. Pothoven, Catherine M. Riseng, Randall M. Claramunt, Harvey A. Bootsma, Ashley Elgin, Mark Rowe, Sara Thomas, Benjamin A. Turschak, Sergiusz J. Czesny, Kevin Pangle, David M. Warner
Inferred fish behavior its implications for hydroacoustic surveys in nearshore habitats Inferred fish behavior its implications for hydroacoustic surveys in nearshore habitats
Population availability and vessel avoidance effects on hydroacoustic abundance estimates may be scale dependent; therefore, it is important to evaluate these biases across systems. We performed an inter-ship comparison survey to determine the effect of vessel size, day-night period, depth, and environmental gradients on walleye (Sander vitreus) density estimates in Lake Erie, an...
Authors
Mark R. DuFour, Christine M. Mayer, Song S. Qian, Christopher Vandergoot, Richard T. Kraus, Patrick Kocovsky, David M. Warner
Biotic and abiotic factors influencing zooplankton vertical distribution in Lake Huron Biotic and abiotic factors influencing zooplankton vertical distribution in Lake Huron
The vertical distribution of zooplankton can have substantial influence on trophic structure in freshwater systems, particularly by determining spatial overlap for predator/prey dynamics and influencing energy transfer. The zooplankton community in some of the Laurentian Great Lakes has undergone changes in composition and declines in total biomass, especially after 2003. Mechanisms...
Authors
Carly J. Nowicki, David B. Bunnell, Patricia M. Dieter, David M. Warner, Henry A. Vanderploeg, Joann F. Cavaletto, Christine M. Mayer, Jean V. Adams
Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data
Hydroacoustic sampling of low-density fish in shallow water can lead to low sample sizes of naturally variable target strength (TS) estimates, resulting in both sparse and variable data. Increasing maximum beam compensation (BC) beyond conventional values (i.e., 3 dB beam width) can recover more targets during data analysis; however, data quality decreases near the acoustic beam edges...
Authors
Mark R. DuFour, Christine M. Mayer, Patrick Kocovsky, Song Qian, David M. Warner, Richard T. Kraus, Christopher Vandergoot
Non-USGS Publications**
Warner, D.M., Rudstam, L.G., and Klumb, R.A. 2002. In situ target strength of alewives in freshwater. Trans. Am. Fish. Soc. 131:212-223.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Data releases by this scientist
Multimedia related to this scientist
Publications by this scientist
Filter Total Items: 53
Describing the distribution and productivity of biota along a nearshore to offshore gradient Describing the distribution and productivity of biota along a nearshore to offshore gradient
The Lake Michigan Lakewide Action and Management Plan (LAMP) proposed adding nutrients (phosphorus) to its “pollutant of concern” list in 2002, given that excessive nutrients were causing impairments in nearshore waters. Since that time, scientists have highlighted the “shunting” of nutrients to the nearshore (Hecky et al. 2004), owing to the ability of invasive dreissenid mussels to...
Authors
David B. Bunnell, Patricia M. Dieter, David M. Warner, Lauren A. Eaton, Drew Eppehimer
Status of pelagic prey fishes in Lake Michigan, 2017 Status of pelagic prey fishes in Lake Michigan, 2017
Acoustic surveys were conducted in late summer/early fall during the years 1992-1996 and 2001-2017 to estimate pelagic prey fish biomass in Lake Michigan. Midwater trawling during the surveys as well as target strength provided a measure of species and size composition of the fish community for use in scaling acoustic data and providing species-specific abundance estimates. The 2017...
Authors
David M. Warner, Ben Turscah, Dale Hanson, Timothy J. Desorcie, Timothy P. O’Brien, Patricia M. Dieter, Jason Smith
Are changes in lower trophic levels limiting prey-fish biomass and production in Lake Michigan? Are changes in lower trophic levels limiting prey-fish biomass and production in Lake Michigan?
To improve understanding of how recent changes in lower trophic levels in Lake Michigan could be affecting prey-fish biomass and production, the Lake Michigan Committee (LMC) convened a Lower Trophic Level Task Group and provided several charges that are responded to in this report. First, we compiled a comprehensive summary of lower trophiclevel data in Lake Michigan, separating out...
Authors
David B. Bunnell, Hunter J. Carrick, Charles P. Madenjian, Edward S. Rutherford, Henry A. Vanderploeg, Richard P. Barbiero, Elizabeth Hinchey-Malloy, Steven A. Pothoven, Catherine M. Riseng, Randall M. Claramunt, Harvey A. Bootsma, Ashley Elgin, Mark Rowe, Sara Thomas, Benjamin A. Turschak, Sergiusz J. Czesny, Kevin Pangle, David M. Warner
Inferred fish behavior its implications for hydroacoustic surveys in nearshore habitats Inferred fish behavior its implications for hydroacoustic surveys in nearshore habitats
Population availability and vessel avoidance effects on hydroacoustic abundance estimates may be scale dependent; therefore, it is important to evaluate these biases across systems. We performed an inter-ship comparison survey to determine the effect of vessel size, day-night period, depth, and environmental gradients on walleye (Sander vitreus) density estimates in Lake Erie, an...
Authors
Mark R. DuFour, Christine M. Mayer, Song S. Qian, Christopher Vandergoot, Richard T. Kraus, Patrick Kocovsky, David M. Warner
Biotic and abiotic factors influencing zooplankton vertical distribution in Lake Huron Biotic and abiotic factors influencing zooplankton vertical distribution in Lake Huron
The vertical distribution of zooplankton can have substantial influence on trophic structure in freshwater systems, particularly by determining spatial overlap for predator/prey dynamics and influencing energy transfer. The zooplankton community in some of the Laurentian Great Lakes has undergone changes in composition and declines in total biomass, especially after 2003. Mechanisms...
Authors
Carly J. Nowicki, David B. Bunnell, Patricia M. Dieter, David M. Warner, Henry A. Vanderploeg, Joann F. Cavaletto, Christine M. Mayer, Jean V. Adams
Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data Sparse targets in hydroacoustic surveys: Balancing quantity and quality of in situ target strength data
Hydroacoustic sampling of low-density fish in shallow water can lead to low sample sizes of naturally variable target strength (TS) estimates, resulting in both sparse and variable data. Increasing maximum beam compensation (BC) beyond conventional values (i.e., 3 dB beam width) can recover more targets during data analysis; however, data quality decreases near the acoustic beam edges...
Authors
Mark R. DuFour, Christine M. Mayer, Patrick Kocovsky, Song Qian, David M. Warner, Richard T. Kraus, Christopher Vandergoot
Non-USGS Publications**
Warner, D.M., Rudstam, L.G., and Klumb, R.A. 2002. In situ target strength of alewives in freshwater. Trans. Am. Fish. Soc. 131:212-223.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.