David A Hewitt, Ph.D.
David Hewitt is a Research Ecologist at the Wetland and Aquatic Research Center. Previously, David was a Research Fish Biologist at the Western Fisheries Research Center where he provided guidance for the research and monitoring program for two endangered catostomids in the Upper Klamath Basin of Oregon and California.
Related Content:
Hewitt, D. A., V. N. Ut, M. E. Andersen, J. W. Beeman, H. C. Patricio, S. M. Ainsley, S. Ounboundisane, D. Demko, and C. Conzelmann. 2015. Collaborative research of Mekong River fishes. Global Conference on Inland Fisheries, FAO, Rome, Italy. [Poster]
Education and Certifications
Ph.D. 2009. Marine Science (Fisheries Science/Crustacean Ecology), Virginia Institute of Marine Science, College of William and Mary, Advisor: Dr. Rom Lipcius
M.S. 2003. Fisheries and Wildlife Sciences (Minor in Statistics), North Carolina State University, Department of Zoology, North Carolina Cooperative Fish and Wildlife Research Unit, Advisor: Hightower
B.S. 2000. Fisheries Science, Virginia Tech, Department of Fisheries and Wildlife Sciences, College of Natural Resources, Blacksburg, VA
Science and Products
Filter Total Items: 32
Colonial waterbird predation on Lost River and Shortnose suckers in the Upper Klamath Basin Colonial waterbird predation on Lost River and Shortnose suckers in the Upper Klamath Basin
We evaluated predation on Lost River Suckers Deltistes luxatus and Shortnose Suckers Chasmistes brevirostris by American white pelicans Pelecanus erythrorhynchos and double-crested cormorants Phalacrocorax auritus nesting at mixed-species colonies in the Upper Klamath Basin of Oregon and California during 2009–2014. Predation was evaluated by recovering (detecting) PIT tags from tagged...
Authors
Allen Evans, David Hewitt, Quinn Payton, Bradley Cramer, Ken Collis, Daniel Roby
The logic of comparative life history studies for estimating key parameters, with a focus on natural mortality rate The logic of comparative life history studies for estimating key parameters, with a focus on natural mortality rate
There are a number of key parameters in population dynamics that are difficult to estimate, such as natural mortality rate, intrinsic rate of population growth, and stock-recruitment relationships. Often, these parameters of a stock are, or can be, estimated indirectly on the basis of comparative life history studies. That is, the relationship between a difficult to estimate parameter...
Authors
John M Hoenig, Amy Then, Elizabeth Babcock, Norman Hall, David Hewitt, Sybrand Hesp
Investing in citizen science can improve natural resource management and environmental protection Investing in citizen science can improve natural resource management and environmental protection
Citizen science has made substantive contributions to science for hundreds of years. More recently, it has contributed to many articles in peer-reviewed scientific journals and has influenced natural resource management and environmental protection decisions and policies across the nation. Over the last 10 years, citizen science—participation by the public in a scientific project—has...
Authors
Duncan McKinley, Abraham Miller-Rushing, Heidi Ballard, Rick Bonney, Hutch Brown, Daniel Evans, Rebecca French, Julia Parrish, Tina Phillips, Sean Ryan, Lea Shanley, Jennifer Shirk, Kristine Stepenuck, Jake F. Weltzin, Andrea Wiggins, Owen Boyle, Russell Briggs, Stuart F. Chapin, David Hewitt, Peter Preuss, Michael Soukup
Status and trends of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) sucker populations in Upper Klamath Lake, Oregon, 2014 Status and trends of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) sucker populations in Upper Klamath Lake, Oregon, 2014
Executive Summary Data from a long-term capture-recapture program were used to assess the status and dynamics of populations of two long-lived, federally endangered catostomids in Upper Klamath Lake, Oregon. Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) have been captured and tagged with passive integrated transponder (PIT) tags during their...
Authors
David Hewitt, Eric Janney, Brian S. Hayes, Alta C. Harris
Colonial waterbird predation on Lost River and shortnose suckers based on recoveries of passive integrated transponder tags Colonial waterbird predation on Lost River and shortnose suckers based on recoveries of passive integrated transponder tags
We evaluated predation on Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris), both listed under the Endangered Species Act (ESA), from American white pelicans (Pelecanus erythrorhynchos) and double-crested cormorants (Phalacrocorax auritus) nesting at mixed species colonies on Clear Lake Reservoir, CA and Upper Klamath Lake, OR during 2009-2014...
Authors
Allen Evans, Quinn Payton, Bradley D. Cramer, Ken Collis, David Hewitt, Daniel Roby
Effects of lake surface elevation on shoreline-spawning Lost River Suckers Effects of lake surface elevation on shoreline-spawning Lost River Suckers
We analyzed remote detection data from PIT-tagged Lost River Suckers Deltistes luxatus at four shoreline spawning areas in Upper Klamath Lake, Oregon, to determine whether spawning of this endangered species was affected by low water levels. Our investigation was motivated by the observation that the surface elevation of the lake during the 2010 spawning season was the lowest in 38 years
Authors
Summer Burdick, David Hewitt, J.E. Rasmussen, Brian Hayes, Eric Janney, Alta C. Harris
Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2012 Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2012
Data from a long-term capture-recapture program were used to assess the status and dynamics of populations of two long-lived, federally endangered catostomids in Upper Klamath Lake, Oregon. Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) have been captured and tagged with passive integrated transponder (PIT) tags during their spawning migrations in...
Authors
David Hewitt, Eric Janney, Brian S. Hayes, Alta C. Harris
Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species
Many methods have been developed in the last 70 years to predict the natural mortality rate, M, of a stock based on empirical evidence from comparative life history studies. These indirect or empirical methods are used in most stock assessments to (i) obtain estimates of M in the absence of direct information, (ii) check on the reasonableness of a direct estimate of M, (iii) examine the...
Authors
Amy Y. Then, John M Hoenig, Norman Hall, David Hewitt
Monitoring of adult Lost River and shortnose suckers in Clear Lake Reservoir, California, 2008–2010 Monitoring of adult Lost River and shortnose suckers in Clear Lake Reservoir, California, 2008–2010
Executive Summary In collaboration with the Bureau of Reclamation, the U.S. Geological Survey began a consistent monitoring program for endangered Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Clear Lake Reservoir, California, in the fall of 2004. The program was intended to develop a more complete understanding of the Clear Lake Reservoir...
Authors
David Hewitt, Brian S. Hayes
Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon
Chiloquin Dam was constructed in 1914 on the Sprague River near the town of Chiloquin, Oregon. The dam was identified as a barrier that potentially inhibited or prevented the upstream spawning migrations and other movements of endangered Lost River (Deltistes luxatus
Authors
Barbara Martin, David Hewitt, Craig Ellsworth
The Mekong Fish Network: expanding the capacity of the people and institutions of the Mekong River Basin to share information and conduct standardized fisheries monitoring The Mekong Fish Network: expanding the capacity of the people and institutions of the Mekong River Basin to share information and conduct standardized fisheries monitoring
The Mekong River is one of the most biologically diverse rivers in the world, and it supports the most productive freshwater fisheries in the world. Millions of people in the Lower Mekong River Basin (LMB) countries of the Union of Myanmar (Burma), Lao People’s Democratic Republic, the Kingdom of Thailand, the Kingdom of Cambodia, and the Socialist Republic of Vietnam rely on the...
Authors
Harmony Patricio, Shaara Ainsley, Matthew Andersen, John Beeman, David Hewitt
Style, usage, grammar, and punctuation Style, usage, grammar, and punctuation
No abstract available.
Authors
Alexander Zale, David Hewitt, Brian R. Murphy
Non-USGS Publications**
Hewitt, D. A., and J. M. Hoenig. 2005. Comparison of two approaches for estimating natural mortality based on longevity. Fishery Bulletin 103(2):433-437.
Hoenig, J. M., and D. A. Hewitt. 2005. What can we learn about mortality from sex ratio data? A look at lumpfish in Newfoundland. Transactions of the American Fisheries Society 134:754-761. [Note the two important errata appended to the file.]
Hewitt, D. A., W. E. Pine, III, and A. V. Zale, editors. 2006. The AFS Guide to Fisheries Employment, 2nd Edition. American Fisheries Society, Bethesda, Maryland. (Available through the AFS online bookstore.)
Hewitt, D.A., D.M. Lambert, J.M. Hoenig, R.N. Lipcius, D.B. Bunnell, and T.J. Miller. 2007. Direct and Indirect Estimates of Natural Mortality for Chesapeake Bay Blue Crab. Transactions of the American Fisheries Society, 136(4): 1030-1040.
**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
Filter Total Items: 32
Colonial waterbird predation on Lost River and Shortnose suckers in the Upper Klamath Basin Colonial waterbird predation on Lost River and Shortnose suckers in the Upper Klamath Basin
We evaluated predation on Lost River Suckers Deltistes luxatus and Shortnose Suckers Chasmistes brevirostris by American white pelicans Pelecanus erythrorhynchos and double-crested cormorants Phalacrocorax auritus nesting at mixed-species colonies in the Upper Klamath Basin of Oregon and California during 2009–2014. Predation was evaluated by recovering (detecting) PIT tags from tagged...
Authors
Allen Evans, David Hewitt, Quinn Payton, Bradley Cramer, Ken Collis, Daniel Roby
The logic of comparative life history studies for estimating key parameters, with a focus on natural mortality rate The logic of comparative life history studies for estimating key parameters, with a focus on natural mortality rate
There are a number of key parameters in population dynamics that are difficult to estimate, such as natural mortality rate, intrinsic rate of population growth, and stock-recruitment relationships. Often, these parameters of a stock are, or can be, estimated indirectly on the basis of comparative life history studies. That is, the relationship between a difficult to estimate parameter...
Authors
John M Hoenig, Amy Then, Elizabeth Babcock, Norman Hall, David Hewitt, Sybrand Hesp
Investing in citizen science can improve natural resource management and environmental protection Investing in citizen science can improve natural resource management and environmental protection
Citizen science has made substantive contributions to science for hundreds of years. More recently, it has contributed to many articles in peer-reviewed scientific journals and has influenced natural resource management and environmental protection decisions and policies across the nation. Over the last 10 years, citizen science—participation by the public in a scientific project—has...
Authors
Duncan McKinley, Abraham Miller-Rushing, Heidi Ballard, Rick Bonney, Hutch Brown, Daniel Evans, Rebecca French, Julia Parrish, Tina Phillips, Sean Ryan, Lea Shanley, Jennifer Shirk, Kristine Stepenuck, Jake F. Weltzin, Andrea Wiggins, Owen Boyle, Russell Briggs, Stuart F. Chapin, David Hewitt, Peter Preuss, Michael Soukup
Status and trends of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) sucker populations in Upper Klamath Lake, Oregon, 2014 Status and trends of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) sucker populations in Upper Klamath Lake, Oregon, 2014
Executive Summary Data from a long-term capture-recapture program were used to assess the status and dynamics of populations of two long-lived, federally endangered catostomids in Upper Klamath Lake, Oregon. Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) have been captured and tagged with passive integrated transponder (PIT) tags during their...
Authors
David Hewitt, Eric Janney, Brian S. Hayes, Alta C. Harris
Colonial waterbird predation on Lost River and shortnose suckers based on recoveries of passive integrated transponder tags Colonial waterbird predation on Lost River and shortnose suckers based on recoveries of passive integrated transponder tags
We evaluated predation on Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris), both listed under the Endangered Species Act (ESA), from American white pelicans (Pelecanus erythrorhynchos) and double-crested cormorants (Phalacrocorax auritus) nesting at mixed species colonies on Clear Lake Reservoir, CA and Upper Klamath Lake, OR during 2009-2014...
Authors
Allen Evans, Quinn Payton, Bradley D. Cramer, Ken Collis, David Hewitt, Daniel Roby
Effects of lake surface elevation on shoreline-spawning Lost River Suckers Effects of lake surface elevation on shoreline-spawning Lost River Suckers
We analyzed remote detection data from PIT-tagged Lost River Suckers Deltistes luxatus at four shoreline spawning areas in Upper Klamath Lake, Oregon, to determine whether spawning of this endangered species was affected by low water levels. Our investigation was motivated by the observation that the surface elevation of the lake during the 2010 spawning season was the lowest in 38 years
Authors
Summer Burdick, David Hewitt, J.E. Rasmussen, Brian Hayes, Eric Janney, Alta C. Harris
Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2012 Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2012
Data from a long-term capture-recapture program were used to assess the status and dynamics of populations of two long-lived, federally endangered catostomids in Upper Klamath Lake, Oregon. Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) have been captured and tagged with passive integrated transponder (PIT) tags during their spawning migrations in...
Authors
David Hewitt, Eric Janney, Brian S. Hayes, Alta C. Harris
Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species Evaluating the predictive performance of empirical estimators of natural mortality rate using information on over 200 fish species
Many methods have been developed in the last 70 years to predict the natural mortality rate, M, of a stock based on empirical evidence from comparative life history studies. These indirect or empirical methods are used in most stock assessments to (i) obtain estimates of M in the absence of direct information, (ii) check on the reasonableness of a direct estimate of M, (iii) examine the...
Authors
Amy Y. Then, John M Hoenig, Norman Hall, David Hewitt
Monitoring of adult Lost River and shortnose suckers in Clear Lake Reservoir, California, 2008–2010 Monitoring of adult Lost River and shortnose suckers in Clear Lake Reservoir, California, 2008–2010
Executive Summary In collaboration with the Bureau of Reclamation, the U.S. Geological Survey began a consistent monitoring program for endangered Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Clear Lake Reservoir, California, in the fall of 2004. The program was intended to develop a more complete understanding of the Clear Lake Reservoir...
Authors
David Hewitt, Brian S. Hayes
Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon Effects of Chiloquin Dam on spawning distribution and larval emigration of Lost River, shortnose, and Klamath largescale suckers in the Williamson and Sprague Rivers, Oregon
Chiloquin Dam was constructed in 1914 on the Sprague River near the town of Chiloquin, Oregon. The dam was identified as a barrier that potentially inhibited or prevented the upstream spawning migrations and other movements of endangered Lost River (Deltistes luxatus
Authors
Barbara Martin, David Hewitt, Craig Ellsworth
The Mekong Fish Network: expanding the capacity of the people and institutions of the Mekong River Basin to share information and conduct standardized fisheries monitoring The Mekong Fish Network: expanding the capacity of the people and institutions of the Mekong River Basin to share information and conduct standardized fisheries monitoring
The Mekong River is one of the most biologically diverse rivers in the world, and it supports the most productive freshwater fisheries in the world. Millions of people in the Lower Mekong River Basin (LMB) countries of the Union of Myanmar (Burma), Lao People’s Democratic Republic, the Kingdom of Thailand, the Kingdom of Cambodia, and the Socialist Republic of Vietnam rely on the...
Authors
Harmony Patricio, Shaara Ainsley, Matthew Andersen, John Beeman, David Hewitt
Style, usage, grammar, and punctuation Style, usage, grammar, and punctuation
No abstract available.
Authors
Alexander Zale, David Hewitt, Brian R. Murphy
Non-USGS Publications**
Hewitt, D. A., and J. M. Hoenig. 2005. Comparison of two approaches for estimating natural mortality based on longevity. Fishery Bulletin 103(2):433-437.
Hoenig, J. M., and D. A. Hewitt. 2005. What can we learn about mortality from sex ratio data? A look at lumpfish in Newfoundland. Transactions of the American Fisheries Society 134:754-761. [Note the two important errata appended to the file.]
Hewitt, D. A., W. E. Pine, III, and A. V. Zale, editors. 2006. The AFS Guide to Fisheries Employment, 2nd Edition. American Fisheries Society, Bethesda, Maryland. (Available through the AFS online bookstore.)
Hewitt, D.A., D.M. Lambert, J.M. Hoenig, R.N. Lipcius, D.B. Bunnell, and T.J. Miller. 2007. Direct and Indirect Estimates of Natural Mortality for Chesapeake Bay Blue Crab. Transactions of the American Fisheries Society, 136(4): 1030-1040.
**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.