David Wahl, PhD
David is a research scientist at the Geology, Minerals, Energy, and Geophysics Science Center. He received a PhD in Geography from UC Berkeley in 2005. Since joining the USGS in 2004, his research has focused on understanding drivers and impacts of Quaternary environmental change, specifically droughts, floods, and wildfire, in North America and the Pacific Islands.
Professional Experience
2004 - Present, Research Geographer, US Geological Survey, Menlo Park, CA
2011 - Present, Assistant Adjunct Professor, Geography Department, UC Berkeley
Education and Certifications
Ph.D., Geography, University of California, Berkeley, 2005
M.A., Geography, University of California, Berkeley, 2000
B.A., History, Cal Poly, San Luis Obispo, 1996
Science and Products
Filter Total Items: 38
Maintaining the competitiveness of the American Fisheries Society journals: An assessment based on influence and cost-effectiveness 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 H. Wahl, Martha E. Mather
Upper Neogene tephrochronologic correlations in the northern Rio Grande Rift, New Mexico and southern Colorado Upper Neogene tephrochronologic correlations in the northern Rio Grande Rift, New Mexico and southern Colorado
No abstract available.
Authors
Janet L. Slate, Andrei M. Sarna-Wojcicki, Elmira Wan, Daniel Koning, Sean D. Connell, David P. Dethier, David B. Wahl, Michael Perkins
Phenotypic variation and vulnerability to predation in juvenile bluegill sunfish (Lepomis macrochirus) Phenotypic variation and vulnerability to predation in juvenile bluegill sunfish (Lepomis macrochirus)
Bluegill sunfish (Lepomis macrochirus) are known to diversify into two forms specialized for foraging on either limnetic or littoral prey. Because juvenile bluegills seek vegetative cover in the presence of largemouth bass (Micropterus salmoides) predators, natural selection should favor the littoral body design at size ranges most vulnerable to predation. Yet within bluegill populations...
Authors
S. R. Chipps, J.A. Dunbar, David H. Wahl
Estimating mortality rates of adult fish from entrainment through the propellers of river towboats Estimating mortality rates of adult fish from entrainment through the propellers of river towboats
We developed a method to estimate mortality rates of adult fish caused by entrainment through the propellers of commercial towboats operating in river channels. The method combines trawling while following towboats (to recover a fraction of the kills) and application of a hydrodynamic model of diffusion (to estimate the fraction of the total kills collected in the trawls). The sampling...
Authors
S. Gutreuter, John M. Dettmers, David H. Wahl
Piscivory in juvenile walleyes: Relative importance of prey species, timing of spawning of prey fish, and density on growth and survival Piscivory in juvenile walleyes: Relative importance of prey species, timing of spawning of prey fish, and density on growth and survival
We examined the effect of the timing of spawning by prey fish and the species of prey fish on the growth and survival of juvenile walleye Stizostedion vitreum. We expected that age-0 walleyes would grow more in ponds when stocked about the same time as the spawning of gizzard shad Dorosoma cepedianum than when stocked about 6 weeks after spawning. We found, however, that the timing of...
Authors
C.S. Kolar, David H. Wahl, M.L. Hooe
Patterns in abundance of fishes in main channels of the upper Mississippi River system Patterns in abundance of fishes in main channels of the upper Mississippi River system
Abundance of fishes of the main channels of the upper Mississippi River system and of other large North American rivers is largely unknown because historic sampling methods have been inadequate. We used a bottom trawl to estimate spatial and temporal patterns in abundance in the navigation channels of Pool 26 of the Mississippi River and the lower Illinois River. Total biomass density...
Authors
J.M. Dettmers, S. Gutreuter, David H. Wahl, D.A. Soluk
Non-USGS Publications**
Hansen, R., S. Bozarth, J. Jacob, Wahl D. and T. Schreiner (2002) “Climatic and Environmental Variability in the Rise of Maya Civilization.” Ancient Mesoamerica 13: 273-295.
Wahl, D., R. Byrne, T. Schreiner and R. Hansen (2006) “Holocene Vegetation Change in the Northern Peten and its Implications for Maya Prehistory.” Quaternary Research 65:380-389.
**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: 38
Maintaining the competitiveness of the American Fisheries Society journals: An assessment based on influence and cost-effectiveness 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 H. Wahl, Martha E. Mather
Upper Neogene tephrochronologic correlations in the northern Rio Grande Rift, New Mexico and southern Colorado Upper Neogene tephrochronologic correlations in the northern Rio Grande Rift, New Mexico and southern Colorado
No abstract available.
Authors
Janet L. Slate, Andrei M. Sarna-Wojcicki, Elmira Wan, Daniel Koning, Sean D. Connell, David P. Dethier, David B. Wahl, Michael Perkins
Phenotypic variation and vulnerability to predation in juvenile bluegill sunfish (Lepomis macrochirus) Phenotypic variation and vulnerability to predation in juvenile bluegill sunfish (Lepomis macrochirus)
Bluegill sunfish (Lepomis macrochirus) are known to diversify into two forms specialized for foraging on either limnetic or littoral prey. Because juvenile bluegills seek vegetative cover in the presence of largemouth bass (Micropterus salmoides) predators, natural selection should favor the littoral body design at size ranges most vulnerable to predation. Yet within bluegill populations...
Authors
S. R. Chipps, J.A. Dunbar, David H. Wahl
Estimating mortality rates of adult fish from entrainment through the propellers of river towboats Estimating mortality rates of adult fish from entrainment through the propellers of river towboats
We developed a method to estimate mortality rates of adult fish caused by entrainment through the propellers of commercial towboats operating in river channels. The method combines trawling while following towboats (to recover a fraction of the kills) and application of a hydrodynamic model of diffusion (to estimate the fraction of the total kills collected in the trawls). The sampling...
Authors
S. Gutreuter, John M. Dettmers, David H. Wahl
Piscivory in juvenile walleyes: Relative importance of prey species, timing of spawning of prey fish, and density on growth and survival Piscivory in juvenile walleyes: Relative importance of prey species, timing of spawning of prey fish, and density on growth and survival
We examined the effect of the timing of spawning by prey fish and the species of prey fish on the growth and survival of juvenile walleye Stizostedion vitreum. We expected that age-0 walleyes would grow more in ponds when stocked about the same time as the spawning of gizzard shad Dorosoma cepedianum than when stocked about 6 weeks after spawning. We found, however, that the timing of...
Authors
C.S. Kolar, David H. Wahl, M.L. Hooe
Patterns in abundance of fishes in main channels of the upper Mississippi River system Patterns in abundance of fishes in main channels of the upper Mississippi River system
Abundance of fishes of the main channels of the upper Mississippi River system and of other large North American rivers is largely unknown because historic sampling methods have been inadequate. We used a bottom trawl to estimate spatial and temporal patterns in abundance in the navigation channels of Pool 26 of the Mississippi River and the lower Illinois River. Total biomass density...
Authors
J.M. Dettmers, S. Gutreuter, David H. Wahl, D.A. Soluk
Non-USGS Publications**
Hansen, R., S. Bozarth, J. Jacob, Wahl D. and T. Schreiner (2002) “Climatic and Environmental Variability in the Rise of Maya Civilization.” Ancient Mesoamerica 13: 273-295.
Wahl, D., R. Byrne, T. Schreiner and R. Hansen (2006) “Holocene Vegetation Change in the Northern Peten and its Implications for Maya Prehistory.” Quaternary Research 65:380-389.
**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.