Theses
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 100 theses authored by our scientists going back to 1959 and refine search by topic, location, year, and advanced search.
Filter Total Items: 157
Aerial survey methodology for bison population estimation in Yellowstone National Park Aerial survey methodology for bison population estimation in Yellowstone National Park
I developed aerial survey methods for statistically rigorous bison population estimation in Yellowstone National Park to support sound resource management decisions and to understand bison ecology. Survey protocols, data recording procedures, a geographic framework, and seasonal stratifications were based on field observations from February 1998-September 2000. The reliability of this...
Authors
Steven C. Hess
From individuals to populations: the direct and indirect effects of predation on waterfowl nest success From individuals to populations: the direct and indirect effects of predation on waterfowl nest success
No abstract available at this time
Authors
Joshua T. Ackerman
How stakeholder roles, power, and negotiation impact natural resource policy: A political economy view How stakeholder roles, power, and negotiation impact natural resource policy: A political economy view
Natural resource management decisions are complicated by multiple property rights, management objectives, and stakeholders with varying degrees of influence over the decision making process. In order to make efficient decisions, managers must incorporate the opinions and values of the involved stakeholders as well as understand the complex institutional constraints and opportunities that...
Authors
L. Caughlan
Long-term benthic community change in a highly invaded estuary Long-term benthic community change in a highly invaded estuary
Ecosystem-level changes in the San Francisco Estuary including reduction in phytoplankton and zooplankton biomass through competition and predation have been linked to the invasive bivalve Potamocorbula amurensis, first found in this estuary in 1986. My study assessed the competitive and other effects of P. amurensis on the benthic community at a long-term benthic monitoring site in...
Authors
Heather Peterson
Test of salt marsh as a site of production and export of fish biomass with implications for impoundment management and restoration Test of salt marsh as a site of production and export of fish biomass with implications for impoundment management and restoration
Salt marshes are among the most productive ecosystems in the world, and although they are thought to enhance the productivity of open estuarine waters, the mechanism by which energy transfer occurs has been debated for decades. One possible mechanism is the transfer of saltmarsh production to estuarine waters by vagile fishes and invertebrates. Saltmarsh impoundments in the Indian River...
Authors
Philip Stevens
The effects of decreasing trace metal concentrations on benthic community structure The effects of decreasing trace metal concentrations on benthic community structure
No abstract available.
Authors
M. K. Shouse
The epizootiology of type C botulism in fish-eating birds at Salton Sea, California The epizootiology of type C botulism in fish-eating birds at Salton Sea, California
During 1996, type C avian botulism killed over 15,000 fish-eating birds at the Salton Sea in southern California. Amont those affected were nearly 10,000 western white pelicans (Pelecanus erythrorhynchos) and over 1,200 endangered California brown pelicans (Pelecanus occidentalis californicus). Since 1996, smaller epizootics have occurred every year. Type C botulism is not typically...
Authors
P. Nol
Lasermap : Software system for processing topographic LIDAR imagery Lasermap : Software system for processing topographic LIDAR imagery
No abstract available
Authors
Amar Nayegandhi
Fire-induced Tree Mortality in the Mixed Conifer Forests of the Sierra Nevada, California Fire-induced Tree Mortality in the Mixed Conifer Forests of the Sierra Nevada, California
No abstract available at this time
Authors
P. van Mantgem