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
Demographics and run timing of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2011
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 Janney, Brian Hayes, Alta Harris
Distribution and condition of young-of-year Lost River and shortnose suckers in the Williamson River Delta restoration project and Upper Klamath Lake, Oregon, 2008-10--Final Report
The Nature Conservancy undertook restoration of the Williamson River Delta Preserve with a primary goal "to restore and maintain the diversity of habitats that are essential to the endangered [Lost River sucker (Deltistes luxatus) and shortnose sucker (Chasmistes brevirostris)] while, at the same time, minimizing disturbance and adverse impacts" (David Evans and Associates, 2005). The...
Authors
Summer M. Burdick, David A. Hewitt
Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2009
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 A. Hewitt, Brian Hayes, Eric Janney, Alta Harris, Justin P. Koller, Mark A. Johnson
Improving inferences from fisheries capture-recapture studies through remote detection of PIT tags
Models for capture-recapture data are commonly used in analyses of the dynamics of fish and wildlife populations, especially for estimating vital parameters such as survival. Capture-recapture methods provide more reliable inferences than other methods commonly used in fisheries studies. However, for rare or elusive fish species, parameter estimation is often hampered by small...
Authors
David A. Hewitt, Eric Janney, Brian Hayes, Rip S. Shively
Demographics and 2008 Run Timing of Adult Lost River (Deltistes luxatus) and Shortnose (Chasmistes brevirostris) Suckers in Upper Klamath Lake
We used capture-recapture data to assess population dynamics of endangered Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon. The Cormack-Jolly-Seber method was used to estimate apparent survival probabilities, and a temporal symmetry model was used to estimate annual seniority probabilities. Information theoretic...
Authors
Eric Janney, Brian Hayes, David A. Hewitt, Patrick M. Barry, Alta C. Scott, Justin P. Koller, Mark A. Johnson, Greta Blackwood
Population Dynamics of Adult Lost River (Deltistes luxatus) and Shortnose (Chasmistes brevirostris) Suckers in Clear Lake Reservoir, California, 2006-08
We report results from ongoing research into the population dynamics of endangered Lost River and shortnose suckers in Clear Lake Reservoir, California. Results are included for sampling that occurred from fall 2006 to spring 2008. We summarize catches and passive integrated transponder tagging efforts from trammel net sampling in fall 2006 and fall 2007, and report on detections of...
Authors
Patrick M. Barry, Eric Janney, David A. Hewitt, Brian Hayes, Alta C. Scott
Maintaining the competitiveness of the American fisheries society journals: an assessment based on influence and cost-effectiveness
Recent changes in the landscape of scientific publishing prompted the Publications Overview Committee of the American Fisheries Society (AFS) to review the Society's portfolio of scientific journals. We evaluated journals based on metrics in two categories: (1) citation-based measures of the influence of a journal on the scientific literature, and (2) measures of the cost-effectiveness...
Authors
David A. Hewitt, Jason S. Link, Dave R. Steinich, David B. Wahl, Martha E. Mather
Direct and indirect estimates of natural mortality for Chesapeake Bay blue crab
Analyses of the population dynamics of blue crab Callinectes sapidus have been complicated by a lack of estimates of the instantaneous natural mortality rate (M). We developed the first direct estimates of M for this species by solving Baranov's catch equation for M given estimates of annual survival rate and exploitation rate. Annual survival rates were estimated from a tagging study on...
Authors
David A. Hewitt, D.M. Lambert, J.M. Hoenig, Romuald N. Lipcius, D.B. Bunnell, T.J. Miller
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
Demographics and run timing of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2011
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 Janney, Brian Hayes, Alta Harris
Distribution and condition of young-of-year Lost River and shortnose suckers in the Williamson River Delta restoration project and Upper Klamath Lake, Oregon, 2008-10--Final Report
The Nature Conservancy undertook restoration of the Williamson River Delta Preserve with a primary goal "to restore and maintain the diversity of habitats that are essential to the endangered [Lost River sucker (Deltistes luxatus) and shortnose sucker (Chasmistes brevirostris)] while, at the same time, minimizing disturbance and adverse impacts" (David Evans and Associates, 2005). The...
Authors
Summer M. Burdick, David A. Hewitt
Demographics and run timing of adult Lost River (Deltistes luxatus) and short nose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, 2009
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 A. Hewitt, Brian Hayes, Eric Janney, Alta Harris, Justin P. Koller, Mark A. Johnson
Improving inferences from fisheries capture-recapture studies through remote detection of PIT tags
Models for capture-recapture data are commonly used in analyses of the dynamics of fish and wildlife populations, especially for estimating vital parameters such as survival. Capture-recapture methods provide more reliable inferences than other methods commonly used in fisheries studies. However, for rare or elusive fish species, parameter estimation is often hampered by small...
Authors
David A. Hewitt, Eric Janney, Brian Hayes, Rip S. Shively
Demographics and 2008 Run Timing of Adult Lost River (Deltistes luxatus) and Shortnose (Chasmistes brevirostris) Suckers in Upper Klamath Lake
We used capture-recapture data to assess population dynamics of endangered Lost River suckers (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) in Upper Klamath Lake, Oregon. The Cormack-Jolly-Seber method was used to estimate apparent survival probabilities, and a temporal symmetry model was used to estimate annual seniority probabilities. Information theoretic...
Authors
Eric Janney, Brian Hayes, David A. Hewitt, Patrick M. Barry, Alta C. Scott, Justin P. Koller, Mark A. Johnson, Greta Blackwood
Population Dynamics of Adult Lost River (Deltistes luxatus) and Shortnose (Chasmistes brevirostris) Suckers in Clear Lake Reservoir, California, 2006-08
We report results from ongoing research into the population dynamics of endangered Lost River and shortnose suckers in Clear Lake Reservoir, California. Results are included for sampling that occurred from fall 2006 to spring 2008. We summarize catches and passive integrated transponder tagging efforts from trammel net sampling in fall 2006 and fall 2007, and report on detections of...
Authors
Patrick M. Barry, Eric Janney, David A. Hewitt, Brian Hayes, Alta C. Scott
Maintaining the competitiveness of the American fisheries society journals: an assessment based on influence and cost-effectiveness
Recent changes in the landscape of scientific publishing prompted the Publications Overview Committee of the American Fisheries Society (AFS) to review the Society's portfolio of scientific journals. We evaluated journals based on metrics in two categories: (1) citation-based measures of the influence of a journal on the scientific literature, and (2) measures of the cost-effectiveness...
Authors
David A. Hewitt, Jason S. Link, Dave R. Steinich, David B. Wahl, Martha E. Mather
Direct and indirect estimates of natural mortality for Chesapeake Bay blue crab
Analyses of the population dynamics of blue crab Callinectes sapidus have been complicated by a lack of estimates of the instantaneous natural mortality rate (M). We developed the first direct estimates of M for this species by solving Baranov's catch equation for M given estimates of annual survival rate and exploitation rate. Annual survival rates were estimated from a tagging study on...
Authors
David A. Hewitt, D.M. Lambert, J.M. Hoenig, Romuald N. Lipcius, D.B. Bunnell, T.J. Miller
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.