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Year Published: 2007

Evaluating robustness in rank-based risk assessments of freshwater ecosystems

Conservation planning aims to protect biodiversity by sustainng the natural physical, chemical, and biological processes within representative ecosystems. Often data to measure these components are inadequate or unavailable. The impact of human activities on ecosystem processes complicates integrity assessments and might alter ecosystem...

Mattson, K.M.; Angermeier, Paul

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Year Published: 2007

Assessing functional equivalency of nekton habitat in enhanced habitats: Comparison of terraced and unterraced marsh ponds

A primary goal of many coastal restoration programs is to increase nekton habitat in terms of both quantity and quality. Using shallow water ponds rehabilitated with a technique called marsh terracing, we examined the quality of nekton habitat created, using and comparing several metrics including nekton density and diversity, functional group...

La Peyre, M.K.; Gossman, B.; Nyman, J.A.

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Year Published: 2007

Assessing the concentration, speciation, and toxicity of dissolved metals during mixing of acid-mine drainage and ambient river water downstream of the Elizabeth Copper Mine, Vermont, USA

The authors determine the composition of a river that is impacted by acid-mine drainage, evaluate dominant physical and geochemical processes controlling the composition, and assess dissolved metal speciation and toxicity using a combination of laboratory, field and modeling studies. Values of pH increase from 3.3 to 7.6 and the sum of dissolved...

Balistrieri, Laurie S.; Seal, R.R.; Piatak, N.M.; Paul, B.

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Year Published: 2007

Fish assemblages of the upper Little Sioux River basin, Iowa, USA: Relationships with stream size and comparison with historical assemblages

We characterized the fish assemblages in second to fifth order streams of the upper Little Sioux River basin in northwest Iowa, USA and compared our results with historical surveys. The fish assemblage consisted of over twenty species, was dominated numerically by creek chub, sand shiner, central stoneroller and other cyprinids, and was dominated...

Palic, D.; Helland, L.; Pedersen, B.R.; Pribil, J.R.; Grajeda, R.M.; Loan-Wilsey, Anna; Pierce, C.L.

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Year Published: 2007

Foraging patterns of Caspian terns and double-crested cormorants in the Columbia River estuary

We examined spatial and temporal foraging patterns of Caspian terns and double-crested cormorants nesting in the Columbia River estuary, to potentially identify circumstances where juvenile salmonids listed under the U.S. Endangered Species Act might be more vulnerable to predation by these avian piscivores. Data were collected during the 1998 and...

Lyons, Donald E.; Roby, D.D.; Collis, K.

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Year Published: 2007

Introduced species and abiotic factors affect longitudinal variation in small fish assemblages in the Wind River watershed, Wyoming

We assessed longitudinal variation in small fish assemblages in the Wind River watershed upstream from Boysen Reservoir, Wyoming and into the reservoir. Twenty-six species were found in the study area, and 12 of the species were believed to have been introduced since settlement by Europeans. Additions and losses of fish species occurred with...

Lionberger, P.S.; Hubert, W.A.

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Year Published: 2007

Walleye consumption and long-term population trends following gizzard shad introduction into a Western South Dakota reservoir

The gizzard shad (Dorosoma cepedianum) was introduced into 1,955-ha Angostura Reservoir, South Dakota to provide increased prey resources for walleye (Sander vitreus). Linear correlation analysis indicated that following gizzard shad introduction, walleye catch-per-unit-effort and mean length at age have increased over time (r = 0.68 to 0.85, P =...

Ward, M.J.; Willis, D.W.; Miller, B.H.; Chipps, S.R.

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Year Published: 2006

Ecosystem element cycling

El-Shaarawi, Abdel H.; Piegorsch, Walter W.; McGuire, A. David
Ecosystem element cycling; 2006; Book chapter; Book; Encyclopedia of Environmetrics; McGuire, A. David

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Year Published: 2006

Correlated growth and survival of juvenile spectacled eiders: Evidence of habitat limitation?

We studied the growth and survival of Spectacled Eider (Somateria fischeri) ducklings to 30 days of age along the lower Kashunuk River on the Yukon-Kuskokwim Delta from 1995 to 2000. We replicated this study at a second site, Kigigak Island, in 1999 and 2000. Age-adjusted estimates of duckling mass and survival at 30 days posthatching were highly...

Flint, Paul L.; Morse, Julie A.; Grand, James B.; Moran, Christine L.
Correlated growth and survival of juvenile spectacled eiders: Evidence of habitat limitation?; 2006; Article; Journal; Condor; Flint, P. L.; Morse, J. A.; Grand, J. B.; Moran, C. L.

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Year Published: 2006

Modeling spatial and temporal variations in temperature and salinity during stratification and overturn in Dexter Pit Lake, Tuscarora, Nevada, USA

This paper examines the seasonal cycling of temperature and salinity in Dexter pit lake in arid northern Nevada, and describes an approach for modeling the physical processes that operate in such systems. The pit lake contains about 596,200 m3 of dilute, near neutral (pHs 6.7–9) water. Profiles of temperature, conductivity, and selected...

Balistrieri, Laurie S.; Tempel, R.N.; Stillings, L.L.; Shevenell, L.A.

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Year Published: 2005

Non-lethal estimation of body composition of Yukon River salmon

Because of the importance of Chinook salmon to commercial and subsistence fisheries on the Yukon River, further study of the factors that may affect the success of this species and our ability to manage the fisheries is warranted. Critical to these studies is the determination of the amount of lipids (fat) stored and available to the fish as its...

Margraf, F. Joseph; Hartman, Kyle J.; Cox, M. Keith

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Year Published: 2005

Central Arctic caribou and petroleum development: Distributional, nutritional, and reproductive implications

We synthesize findings from cooperative research on effects of petroleum development on caribou (Rangifer tarandus granti) of the Central Arctic Herd (CAH). The CAH increased from about 6000 animals in 1978 to 23000 in 1992, declined to 18 000 by 1995, and again increased to 27 000 by 2000. Net calf production was consistent with changes in herd...

Cameron, Raymond D.; Smith, Walter T.; White, Robert G.; Griffith, Brad