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 F. Evans, David A. Hewitt, Quinn Payton, Bradley M. Cramer, Ken Collis, Daniel D. 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 Y.-H. Then, Elizabeth A. Babcock, Norman G. Hall, David A. Hewitt, Sybrand A. 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 C. McKinley, Abraham J. Miller-Rushing, Heidi L. Ballard, Rick Bonney, Hutch Brown, Daniel M. Evans, Rebecca A. French, Julia K. Parrish, Tina B. Phillips, Sean F. Ryan, Lea A. Shanley, Jennifer L. Shirk, Kristine F. Stepenuck, Jake F. Weltzin, Andrea Wiggins, Owen D. Boyle, Russell D. Briggs, Stuart F. Chapin, David A. Hewitt, Peter W. Preuss, Michael A. 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 A. Hewitt, Eric C. 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 A. Hewitt, Daniel D. 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 M. Burdick, David A. Hewitt, J.E. Rasmussen, Brian Hayes, Eric Janney, Alta C. Harris
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 F. Evans, David A. Hewitt, Quinn Payton, Bradley M. Cramer, Ken Collis, Daniel D. 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 Y.-H. Then, Elizabeth A. Babcock, Norman G. Hall, David A. Hewitt, Sybrand A. 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 C. McKinley, Abraham J. Miller-Rushing, Heidi L. Ballard, Rick Bonney, Hutch Brown, Daniel M. Evans, Rebecca A. French, Julia K. Parrish, Tina B. Phillips, Sean F. Ryan, Lea A. Shanley, Jennifer L. Shirk, Kristine F. Stepenuck, Jake F. Weltzin, Andrea Wiggins, Owen D. Boyle, Russell D. Briggs, Stuart F. Chapin, David A. Hewitt, Peter W. Preuss, Michael A. 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 A. Hewitt, Eric C. 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 A. Hewitt, Daniel D. 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 M. Burdick, David A. Hewitt, J.E. Rasmussen, Brian Hayes, Eric Janney, Alta C. Harris
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.