David Kazyak, Ph.D.
Dave Kazyak is a Supervisory Research Fish Biologist at the USGS Eastern Ecological Science Center in Kearneysville, WV.
Dave Kazyak is a Supervisory Research Fish Biologist at the USGS Eastern Ecological Science Center leads a conservation genetics and genomics research team. His research applies quantitative approaches in conservation genetics and population dynamics to provide decision-relevant information for imperiled species. Dave Kazyak's current projects use cutting-edge genetics tools to identify biologically-appropriate management units, measure rates of gene flow, and characterize how isolation, genetic drift, and hatchery supplementation impact wild populations. He also is working to develop novel approaches to census imperiled fishes, including techniques using combinations of acoustic telemetry, side-scan sonar, and genetics.
Professional Experience
2017-Present. U.S. Geological Survey, Eastern Ecological Science Center. Research Fish Biologist.
2015-2017. U.S. Geological Survey, Leetown Science Center (Integrated Statistics Contractor) - Postdoctoral Scientist.
Education and Certifications
Ph.D. 2015. University of Maryland (Marine Estuarine and Environmental Science)
M.S. 2011. University of Maine (Wildlife Ecology)
B.S. 2008. Frostburg State University (Wildlife and Fisheries)
Affiliations and Memberships*
American Fisheries Society
North American Sturgeon and Paddlefish Society
Science and Products
Population genetics of three at-risk tiger beetles Habroscelimorpha dorsalis dorsalis, H. d. media, and Ellipsoptera puritana
Using genetic data to advance stream fish reintroduction science: A case study in brook trout
Landscape and stocking effects on population genetics of Tennessee Brook Trout
Stock composition of the historical New York Bight Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) intercept fishery revealed through microsatellite analysis of archived spines
Population genetics of Brook Trout (Salvelinus fontinalis) in the southern Appalachian Mountains
Phenotypic variation in Brook Trout Salvelinus fontinalis (Mitchill) at broad spatial scales makes morphology an insufficient basis for taxonomic reclassification of the species
Optimization of a suite of flathead catfish (Pylodictis olivaris) microsatellite markers for understanding the population genetics of introduced populations in the northeast United States
Establishment of a microsatellite genetic baseline for North American Atlantic sturgeon (Acipenser o. oxyrhinchus) and range-wide analysis of population genetics
Impacts of sediment removal from and placement in coastal barrier island systems
Executive SummaryOn June 24, 2019, Congressman Raul Grijalva of Arizona, Chair of the House Committee on Natural Resources, sent a letter to the directors of the U.S. Fish and Wildlife Service and the U.S. Geological Survey to request their assistance in answering questions regarding coastal sediment resource management within the Coastal Barrier Resources System as defined by the Coastal Barrier
Atlantic sturgeon status and movement ecology in an extremely small spawning habitat: The Nanticoke River-Marshyhope Creek, Chesapeake Bay
Stock composition of Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) encountered in marine and estuarine environments on the U.S. Atlantic Coast
Genetic structure of Maryland Brook Trout populations: Management implications for a threatened species
Non-USGS Publications**
Management 36:259-266
**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
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Filter Total Items: 36
Population genetics of three at-risk tiger beetles Habroscelimorpha dorsalis dorsalis, H. d. media, and Ellipsoptera puritana
Many tiger beetles (Family Cicindelidae) are critically imperiled due to their dependence on small patches of suitable habitat that are frequently threatened by natural and anthropogenic disturbances. In the eastern United States, conservation of three tiger beetles - Habroscelimorpha dorsalis dorsalis, H. dorsalis media, and Ellipsoptera puritana - has been inhibited by the absence of populationAuthorsDavid C. Kazyak, Aaron Aunins, Shannon L. White, Michael S. Eackles, C. Barry KnisleyUsing genetic data to advance stream fish reintroduction science: A case study in brook trout
Widespread extirpation of native fish populations has led to a rise in species reintroduction efforts worldwide. Most efforts have relied on demographic data alone to guide project design and evaluate success. However, the genetic characteristics of many imperiled fish populations including low diversity, local adaptation, and hatchery introgression emphasize the importance of genetic data in theAuthorsShannon L. White, Thomas C Johnson, Jacob M Rash, Barbara A. Lubinski, David C. KazyakLandscape and stocking effects on population genetics of Tennessee Brook Trout
Throughout their range, Brook Trout (Salvelinus fontinalis) occupy thousands of disjunct drainages with varying levels of disturbance, which presents substantial challenges for conservation. Within the southern Appalachian Mountains, fragmentation and genetic drift have been identified as key threats to the genetic diversity of the Brook Trout populations. In addition, extensive historic stockingAuthorsJohn S. Hargrove, David C. Kazyak, Barbara A. Lubinski, Karli M. Rogers, Olivia K. Bowers, Kurt A. Fesenmyer, Jim W. Habera, Jason HenegarStock composition of the historical New York Bight Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) intercept fishery revealed through microsatellite analysis of archived spines
A targeted commercial fishery for Atlantic Sturgeon Acipenser oxyrinchus oxyrinchus once operated in the New York Bight, where it was assumed that most harvested Atlantic Sturgeon were natal to the Hudson River population. However, more recent evidence suggests that the fishery may have been targeting a mixed-stock aggregation, in which case harvested Atlantic Sturgeon could have been comprised ofAuthorsShannon L. White, Robin L. Johnson, Barbara A. Lubinski, Michael S. Eackles, David H. Secor, David C. KazyakPopulation genetics of Brook Trout (Salvelinus fontinalis) in the southern Appalachian Mountains
Broad-scale patterns of genetic diversity for Brook Trout remain poorly understood across their endemic range in the eastern United States. We characterized variation at 12 microsatellite loci in 22,020 Brook Trout among 836 populations from Georgia, USA to Quebec, Canada to the western Great Lakes region. Within-population diversity was typically lower in the southern Appalachians relative to theAuthorsDavid C. Kazyak, Barbara A. Lubinski, Matt A. Kulp, K. C. Pregler, Andrew R. Whiteley, Eric M. Hallerman, Jason A. Coombs, Y. Kanno, Jacob Rash, Raymond P. Morgan II, Jim Habera, Jason Henegar, T. Casey Weathers, Matthew T. Sell, Anthony Rabern, Dan Rankin, Tim L. KingPhenotypic variation in Brook Trout Salvelinus fontinalis (Mitchill) at broad spatial scales makes morphology an insufficient basis for taxonomic reclassification of the species
It was recently proposed that there are three new species of Salvelinus with microendemic distributions in the Great Smoky Mountains National Park, Tennessee, USA. The three species of Salvelinus were hypothesized to be distinct from their congener Brook Trout S. fontinalis based on three meristic traits—pored lateral-line scales, vertebral counts, and number of basihyal teeth. After analyses thatAuthorsShannon L. White, David C. Kazyak, Richard C Harrington, Matt A. Kulp, Jacob M Rash, T. Casey Weathers, Thomas J NearOptimization of a suite of flathead catfish (Pylodictis olivaris) microsatellite markers for understanding the population genetics of introduced populations in the northeast United States
Flathead catfish are rapidly expanding into nonnative waterways throughout the United States. Once established, flathead catfish may cause disruptions to the local ecosystem through consumption and competition with native fishes, including species of conservation concern. Flathead catfish often become a popular sport fish in their introduced range, and so management strategies must frequently balaAuthorsShannon L. White, Michael S. Eackles, Tyler Wagner, Megan K. Schall, Geoffrey Smith, Julian Avery, David C. KazyakEstablishment of a microsatellite genetic baseline for North American Atlantic sturgeon (Acipenser o. oxyrhinchus) and range-wide analysis of population genetics
Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) is a long-lived, anadromous species that is broadly distributed along the Atlantic coast of North America. Historic overharvest and habitat degradation resulted in significant declines to Atlantic sturgeon populations and, following decades of limited recovery, the species was listed under the Endangered Species Act of the United States in 2012.AuthorsShannon L. White, David C. Kazyak, Tanya L Darden, Daniel J Farrae, Barbara A. Lubinski, Robin L. Johnson, Michael S. Eackles, M Balazik, Hal Brundage, Adam G Fox, Dewayne A. Fox, Chris H Hager, Jason E Kahn, Isaac I WirginImpacts of sediment removal from and placement in coastal barrier island systems
Executive SummaryOn June 24, 2019, Congressman Raul Grijalva of Arizona, Chair of the House Committee on Natural Resources, sent a letter to the directors of the U.S. Fish and Wildlife Service and the U.S. Geological Survey to request their assistance in answering questions regarding coastal sediment resource management within the Coastal Barrier Resources System as defined by the Coastal Barrier
AuthorsJennifer L. Miselis, James G. Flocks, Sara Zeigler, Davina Passeri, David R. Smith, Jill Bourque, Christopher R. Sherwood, Christopher G. Smith, Daniel J. Ciarletta, Kathryn Smith, Kristen Hart, David C. Kazyak, Alicia Berlin, Bianca Prohaska, Teresa Calleson, Kristi YanchisAtlantic sturgeon status and movement ecology in an extremely small spawning habitat: The Nanticoke River-Marshyhope Creek, Chesapeake Bay
Biotelemetry of Atlantic sturgeon Acipenser oxyrinchus oxyrinchus has exposed spawning behaviors in ever-smaller estuaries, surprising for the NW Atlantic’s largest anadromous species. Small estuary — the Nanticoke River and Marshyhope Creek (Chesapeake Bay) — spawning-run adults and their habitat affinities are described based upon direct sampling and biotelemetry for the period 2014–2018. High rAuthorsD. H. Secor, M. H. P. O'Brien, N. Coleman, A. Horne, I. Park, David C. Kazyak, D. G. Bruce, C StenceStock composition of Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) encountered in marine and estuarine environments on the U.S. Atlantic Coast
Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) is a large, anadromous fish native to the Atlantic Coast of North America. Although this species once supported important fisheries, centuries of exploitation and habitat degradation have resulted in dramatic declines, presumed extirpation in some rivers, and ultimately listing under the U.S. Endangered Species Act (ESA). Under the ESA, AtlanticAuthorsDavid C. Kazyak, Shannon L. White, Barbara A. Lubinski, Robin L. Johnson, Michael S. EacklesGenetic structure of Maryland Brook Trout populations: Management implications for a threatened species
Brook Trout Salvelinus fontinalis have declined across their native range due to multiple anthropogenic factors, including landscape alteration and climate change. Although coldwater streams in Maryland (eastern United States) historically supported significant Brook Trout populations, only fragmented remnant populations remain, with the exception of the upper Savage River watershed in western MarAuthorsRaymond P. Morgan II, David C. Kazyak, Tim L. King, Barbara A. Lubinski, Matthew T. Sell, Alan A Heft, Jess W JonesNon-USGS Publications**
Hilderbrand RH, Kazyak DC. 2017. Spatiotemporal patterns of Brook Trout abundance and implications for stream monitoring. North American Journal of Fisheries Management 37:353-362.Kazyak DC, Hilderbrand RH, King TL, Keller SR, Chhatre VE. 2016. Hiding in plain sight: a case for cryptic metapopulations in Brook Trout (Salvelinus fontinalis). PLOS ONE 11(1): e0146295. doi:10.1371/journal.pone.0146295Kazyak DC, Sell MT, Cooper R, Hilderbrand RH. 2016. A comparison of catchability and mortality with circle and J hooks for stream-dwelling Brook Trout Salvelinus fontinalis. North American Journal of Fisheries
Management 36:259-266
Sell MT, Kazyak DC, Hilderbrand RH, Heft AA, Cooper RM. 2016. A comparison of circle hook size on hooking success, deep hooking rate, and post release mortality of hatchery-reared Rainbow Trout Oncorhynchus mykiss. North American Journal of Fisheries Management 36:254-258
Kazyak DC, Hilderbrand RH, Keller SK, Colaw M, Holloway AE, Morgan RP, King TL. 2015. Spatial structure of morphological and neutral genetic variation in Brook Trout Salvelinus fontinalis. Transactions of the American Fisheries Society 144:480-490Kazyak DC, Hilderbrand RH, Sell MT. 2014. Growth variation in a Mid-Atlantic Brook Trout population. Proceedings of Wild Trout XI. Supplement:350-356
Sell MT, Heft AA, Kazyak DC, Hilderbrand RH, Morgan RP. 2014. Short-term and seasonal movements of eastern Brook Trout (Salvelinus fontinalis) in the upper Savage River watershed, Garrett County, Maryland. Proceedings of Wild Trout XI. Supplement:357-362Stranko SA, Ashton MJ, Hilderbrand RH, Weglein SL, Kazyak DC, Kilian JV. 2014. Fish and benthic macroinvertebrate densities in small streams with and without American Eels. Transactions of the American Fisheries Society 143:700-708Kazyak DC, Letcher BH, Zydlewski J, O'Donnell MJ. 2013. Growth variability of brook charr (Salvelinus fontinalis) in coastal Maine. Ecology of Freshwater Fish. doi: 10.1111/eff.12105
Kazyak DC, Hilderbrand RH, Holloway AE. 2013. Rapid visual assessment to determine sex in Brook Trout. North American Journal of Fisheries Management 33:665-668Kazyak DC, Zydlewski J. 2012. High-density polyethylene: a new material for pass-over PIT antennas. North American Journal of Fisheries Management 32:49-52Strain, GF, Kazyak DC. Raesly R. 2012. Headwaters and headlamps: a comparison of nocturnal and diurnal surveys to estimate richness, abundance, and detection of streamside salamanders. Herpetological Review 43:26-30**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.
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*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government