Publications
Browse publications authored by our scientists. Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more. **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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Post-mortem sporulation of Ceratomyxa shasta (Myxozoa) after death in adult Chinook salmon Post-mortem sporulation of Ceratomyxa shasta (Myxozoa) after death in adult Chinook salmon
Ceratomyxa shasta (Myxozoa) is a common gastrointestinal pathogen of salmonid fishes in the Pacific Northwest of the United States. We have been investigating this parasite in adult Chinook salmon (Oncorhynchus tshawytscha) in the Willamette River, Oregon. In prior work, we observed differences in the pattern of development of C. shasta in adult salmon compared to juvenile salmon. Adult...
Authors
Michael L. Kent, K. Soderlund, E. Thomann, Carl B. Schreck, T.J. Sharpton
Developing and testing temperature models for regulated systems: a case study on the Upper Delaware River Developing and testing temperature models for regulated systems: a case study on the Upper Delaware River
Water temperature is an important driver of many processes in riverine ecosystems. If reservoirs are present, their releases can greatly influence downstream water temperatures. Models are important tools in understanding the influence these releases may have on the thermal regimes of downstream rivers. In this study, we developed and tested a suite of models to predict river temperature...
Authors
Jeffrey C. Cole, Kelly O. Maloney, Matthias Schmid, James E. McKenna
Global research priorities to mitigate plastic pollution impacts on marine wildlife Global research priorities to mitigate plastic pollution impacts on marine wildlife
Marine wildlife faces a growing number of threats across the globe, and the survival of many species and populations will be dependent on conservation action. One threat in particular that has emerged over the last 4 decades is the pollution of oceanic and coastal habitats with plastic debris. The increased occurrence of plastics in marine ecosystems mirrors the increased prevalence of...
Authors
Amanda C. Vegter, Mario Barletta, Cathy A. Beck, Jose C. Borrero, Harry Burton, Marnie L. Campbell, Monica F. Costa, Marcus Eriksen, Cecilia Eriksson, Andres Estrades, Kirsten V. Gilardi, Britta D. Hardesty, Juliana A. Ivar do Sul, Jennifer L. Lavers, Bojan Lazar, Laurent Lebreton, Wallace J. Nichols, Christine A. Ribic, Peter G. Ryan, Qamar A. Schuyler, Stephen D. A. Smith, Hideshige Takada, Kathy A. Townsend, Colette C. C. Wabnitz, Chris Wilcox, Lindsay C. Young, Mark Hamann
Effect of bait and gear type on channel catfish catch and turtle bycatch in a reservoir Effect of bait and gear type on channel catfish catch and turtle bycatch in a reservoir
Hoop nets have become the preferred gear choice to sample channel catfish Ictalurus punctatus but the degree of bycatch can be high, especially due to the incidental capture of aquatic turtles. While exclusion and escapement devices have been developed and evaluated, few have examined bait choice as a method to reduce turtle bycatch. The use of Zote™ soap has shown considerable promise...
Authors
Evan C. Cartabiano, David R. Stewart, James M. Long
Prolonged instability prior to a regime shift Prolonged instability prior to a regime shift
Regime shifts are generally defined as the point of ‘abrupt’ change in the state of a system. However, a seemingly abrupt transition can be the product of a system reorganization that has been ongoing much longer than is evident in statistical analysis of a single component of the system. Using both univariate and multivariate statistical methods, we tested a long-term high-resolution
Authors
Trisha Spanbauer, Craig R. Allen, David G. Angeler, Tarsha Eason, Sherilyn C. Fritz, Ahjond S. Garmestani, Kirsty L. Nash, Jeffery R. Stone
Body morphology differs in wild juvenile Chinook salmon Oncorhynchus tshawytscha in the Willamette River, Oregon, USA Body morphology differs in wild juvenile Chinook salmon Oncorhynchus tshawytscha in the Willamette River, Oregon, USA
Body morphology of juvenile Chinook salmon Oncorhynchus tshawytscha in the upper Willamette River, Oregon, U.S.A., was analysed to determine if variation in body shape is correlated with migratory life-history tactics followed by juveniles. Body shape was compared between migrating juveniles that expressed different life-history tactics, i.e. autumn migrants and yearling smolts, and...
Authors
E.J. Billman, L.D. Whitman, R.K. Schroeder, C.S. Sharpe, David L. G. Noakes, Carl B. Schreck
Distribution, stock composition and timing, and tagging response of wild Chinook Salmon returning to a large, free-flowing river basin Distribution, stock composition and timing, and tagging response of wild Chinook Salmon returning to a large, free-flowing river basin
Chinook Salmon Oncorhynchus tshawytscha returns to the Yukon River basin have declined dramatically since the late 1990s, and detailed information on the spawning distribution, stock structure, and stock timing is needed to better manage the run and facilitate conservation efforts. A total of 2,860 fish were radio-tagged in the lower basin during 2002–2004 and tracked upriver. Fish...
Authors
John H. Eiler, Michele Masuda, Ted R. Spencer, Richard J. Driscoll, Carl B. Schreck
Thermal ecology of subadult and adult muskellunge in a thermally enriched reservoir Thermal ecology of subadult and adult muskellunge in a thermally enriched reservoir
The movement of adult muskellunge, Esox masquinongy Mitchill, has been investigated in a variety of systems, but temperature selection by muskellunge has not been examined where well-oxygenated waters were available over a range of temperatures for much of the year. Thirty subadult and adult muskellunge tagged internally with temperature-sensing radio tags were tracked from March 2010 to...
Authors
A. J. Cole, Phillip William Bettoli
Supplemental feeding alters migration of a temperate ungulate Supplemental feeding alters migration of a temperate ungulate
Conservation of migration requires information on behavior and environmental determinants. The spatial distribution of forage resources, which migration exploits, often are altered and may have subtle, unintended consequences. Supplemental feeding is a common management practice, particularly for ungulates in North America and Europe, and carryover effects on behavior of this...
Authors
Jennifer D. Jones, Matthew Kauffman, Kevin L. Monteith, Brandon M. Scurlock, Shannon E. Albeke, Paul C. Cross
Spatial structuring within a reservoir fish population: implications for management Spatial structuring within a reservoir fish population: implications for management
Spatial structuring in reservoir fish populations can exist because of environmental gradients, species-specific behaviour, or even localised fishing effort. The present study investigated whether white crappie exhibited evidence of improved population structure where the northern more productive half of a lake is closed to fishing to provide waterfowl hunting opportunities. Population...
Authors
David R. Stewart, James M. Long, Daniel E. Shoup
The role of reserves and anthropogenic elements for functional connectivity and resilience of ephemeral habitats The role of reserves and anthropogenic elements for functional connectivity and resilience of ephemeral habitats
Ecological reserves provide important wildlife habitat in many landscapes, and the functional connectivity of reserves and other suitable habitat patches is crucial for the persistence and resilience of spatially structured populations. To maintain or increase connectivity at spatial scales larger than individual patches, conservation actions may focus on creating and maintaining...
Authors
Daniel R. Uden, Michelle L. Hellman, David G. Angeler, Craig R. Allen
Transdisciplinary application of the cross-scale resilience model Transdisciplinary application of the cross-scale resilience model
The cross-scale resilience model was developed in ecology to explain the emergence of resilience from the distribution of ecological functions within and across scales, and as a tool to assess resilience. We propose that the model and the underlying discontinuity hypothesis are relevant to other complex adaptive systems, and can be used to identify and track changes in system parameters...
Authors
Shana M. Sundstrom, David G. Angeler, Ahjond S. Garmestani, Jorge H. Garcia, Craig R. Allen