Fish community responses to the establishment of a piscivore, northern pike (Esox lucius), in a Nebraska Sandhill lake
T.J. DeBates, C.P. Paukert, D.W. Willis
2003, Journal of Freshwater Ecology (18) 353-359
Northern pike (Esox lucius) was first documented in West Long Lake, Nebraska, in 1998 when two pike <380 mm were collected. In 2002, a Peterson mark-recapture population estimate on northern pike revealed density and standing stock (i.e., biomass) estimates of 35.8 fish/ha (95% CI= ± 8.8) and 22.0 kg/ha (95%...
Purple martins, then and now
B. Euliss
2003, Prairie Naturalist (35) 57-58
Review of: The Purple Martin. Robin Doughty and Rob Fergus. 2002. University of Texas Press, Austin, Texas. 93 pages. $19.95 (cloth)....
The role of multiple stressor causes in declining amphibian populations: A wingspread workshop summary
S.K. Krest, G. Linder, D. W. Sparling
Linder G.L.Krest S.Sparling D.Little E.E., editor(s)
2003, Conference Paper, ASTM Special Technical Publication
Numerous studies have documented the decline of amphibian populations over the past decade and no single factor has been the linked to these widespread declines. Determining the causes of declining amphibian populations worldwide has proven difficult because of the variety of anthropogenic and natural suspect agents. A Wingspread workshop, convened...
Crims Island habitat restoration in the Columbia River estuary-fisheries monitoring and evaluation. 2003 Draft report of research
C. A. Haskell, K.F. Tiffan, R.C. Koch, D.W. Rondorf
2003, Report
Abstract not available ...
A model for spatially and temporally distributed shallow landslide initiation by rainfall infiltration
W. Z. Savage, J. W. Godt, R.L. Baum
Rickenmann D.Chen C.L., editor(s)
2003, Conference Paper, International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
We describe a model for regional initiation of shallow landslides based on an approximate analytic solution to Richards equation combined with an infinite-slope calculation. The model applied over digital topography computes pressure heads and factors of safety as functions of depth for geographic information system (GIS) grid cells at any...
Crustal structure of the Peninsular Ranges batholith from magnetic data: Implications for Gulf of California rifting
V.E. Langenheim, R.C. Jachens
2003, Geophysical Research Letters (30) 51-1
A 70-km-wide belt of magnetic highs extends ???1200 km northwest from the southern tip of the Baja California peninsula into southern California. The anomalies are caused by the mafic western belt of the Peninsular Ranges batholith, which is exposed extensively along the northern 800 km length of the magnetic belt....
Identification of larval Pacific lampreys (Lampetra tridentata), river lampreys (L. ayresi), and western brook lampreys (L. richardsoni) and thermal requirements of early life history stages of lampreys. Annual report 2002-2003
M.H. Meeuwig, J.M. Bayer, J.G. Seelye, R.A. Reiche
2003, Report
Two fundamental aspects of lamprey biology were examined to provide tools for population assessment and determination of critical habitat needs of Columbia River Basin (CRB) lampreys (the Pacific lamprey, Lampetra tridentata, and the western brook lamprey, L. richardsoni). We evaluated the usefulness of current diagnostic characteristics for identification of larval...
Surge dynamics coupled to pore-pressure evolution in debris flows
S.B. Savage, R.M. Iverson
Rickenmann D.Chen C.L., editor(s)
2003, Conference Paper, International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
Temporally and spatially varying pore-fluid pressures exert strong controls on debris-flow motion by mediating internal and basal friction at grain contacts. We analyze these effects by deriving a one-dimensional model of pore-pressure diffusion explicitly coupled to changes in debris-flow thickness. The new pore-pressure equation is combined with Iverson's (1997) extension...
The adaptive basis of developmental instability: A hypothesis and its implications
J.M. Emlen, D.C. Freeman, J.H. Graham
2003, Book chapter, Developmental instability: Causes and consequences
Abstract not available ...
Variation in habitat use by juvenile Acadian redfish, Sebastes fasciatus
P.J. Auster, J. Lindholm, P. C. Valentine
2003, Environmental Biology of Fishes (68) 381-389
A basic paradigm in behavioral ecology is that organisms expand their distribution as preferred sites become saturated with individuals that reduce the availability of resources (e.g., shelter, prey) on a per capita basis. Previous fish community studies at Stellwagen Bank National Marine Sanctuary have shown that juvenile Acadian redfish Sebastes...
Wind River watershed restoration 2000-2001
P.J. Connolly
2003, Report
Abstract not available ...
Structural framework of a major intracontinental orogenic termination zone: The easternmost Tien Shan, China
D. Cunningham, L.A. Owen, L.W. Snee, Ji Li
2003, Journal of the Geological Society (160) 575-590
The Barkol Tagh and Karlik Tagh ranges of the easternmost Tien Shan are a natural laboratory for studying the fault architecture of an active termination zone of a major intracontinental mountain range. Barkol and Karlik Tagh and lesser ranges to the north are bounded by active thrust faults that locally...
Emmons Lake Volcanic Center, Alaska Peninsula: Source of the Late Wisconsin Dawson tephra, Yukon Territory, Canada
M. T. Mangan, C. F. Waythomas, T. P. Miller, F. A. Trusdell
2003, Canadian Journal of Earth Sciences (40) 925-936
The Emmons Lake Volcanic Center on the Alaska Peninsula of southwestern Alaska is the site of at least two rhyolitic caldera-forming eruptions (C1 and C2) of late Quaternary age that are possibly the largest of the numerous caldera-forming eruptions known in the Aleutian arc. The deposits produced by these eruptions...
Magnitude and variability of Holocene sediment accumulation in Santa Monica Bay, California
C.K. Sommerfield, H.J. Lee
2003, Marine Environmental Research (56) 151-176
The spatial variability of Holocene (past 10,000 years) sediment accumulation in Santa Monica Bay (California) was examined to identify controls sediment trapping in a bathymetrically complex coastal embayment and to provide geologic context for the post-industrial sedimentary record and associated pollution gradients. Sediment chronologies based on downcore AMS 14C dates...
Effects of electrofishing gear type on spatial and temporal variability in fish community sampling
M. R. Meador, J.P. McIntyre
2003, Transactions of the American Fisheries Society (132) 709-716
Fish community data collected from 24 major river basins between 1993 and 1998 as part of the U.S. Geological Survey's National Water-Quality Assessment Program were analyzed to assess multiple-reach (three consecutive reaches) and multiple-year (three consecutive years) variability in samples collected at a site. Variability was assessed using the coefficient...
Reduction in sea lamprey hatching success due to release of sterilized males
Roger A. Bergstedt, Rodney B. McDonald, Michael B. Twohey, Katherine M. Mullett, Robert J. Young, John W. Heinrich
2003, Journal of Great Lakes Research (29) 435-444
Male sea lampreys (Petromyzon marinus), sterilized by injection with bisazir, were released in Lake Superior tributaries from 1991 to 1996 and exclusively in the St. Marys River (the outflow from Lake Superior to Lake Huron) since 1997 as an alternative to chemical control. To determine effectiveness in reducing reproductive potential...
Techniques and methods for estimating abundance of larval and metamorphosed sea lampreys in Great Lakes tributaries, 1995 to 2001
Jeffrey W. Slade, Jean V. Adams, Gavin C. Christie, Douglas W. Cuddy, Michael F. Fodale, John W. Heinrich, Henry R. Quinlan, Jerry G. Weise, John W. Weisser, Robert J. Young
2003, Journal of Great Lakes Research (29) 137-151
Before 1995, Great Lakes streams were selected for lampricide treatment based primarily on qualitative measures of the relative abundance of larval sea lampreys, Petromyzon marinus. New integrated pest management approaches required standardized quantitative measures of sea lamprey. This paper evaluates historical larval assessment techniques and data and describes how new...
Evaluation of strategies for the release of male sea lampreys (Petromyzon marinus) in Lake Superior for a proposed sterile-male-release program
C. A. Kaye, J.W. Heinrich, J.H. Genovese, L.H. Hanson, R.B. McDonald, J.W. Slade, W.D. Swink
2003, Journal of Great Lakes Research (29) 424-434
Successful implementation of a sea lamprey (Petromyzon marinus) control technique that uses sterilized males to reduce reproduction presently depends on the importation of large numbers of males outside of the target population. Strategies were examined for releasing male sea lampreys from Lakes Michigan and Huron into the Lake Superior spawning...
Agreement among observers classifying larval sea lamprey (Petromyzon marinus) habitat
Katherine M. Mullett, Roger A. Bergstedt
2003, Journal of Great Lakes Research (29) 183-189
Estimates of larval sea lamprey (Petromyzon marinus) abundance are used to rank Great Lakes tributaries for lampricide treatment. Observers subjectively stratify habitat into three categories: type I = preferred, type II = acceptable, type III = unacceptable. Agreement was evaluated among eight observers classifying habitats in small discrete plots in...
Historic and modern abundance of wild lean lake trout in Michigan waters of Lake Superior: Implications for restoration goals
Michael J. Wilberg, Michael J. Hansen, Charles R. Bronte
2003, North American Journal of Fisheries Management (23) 100-108
Populations of lake trout Salvelinus namaycush in Lake Superior collapsed in the late 1950s due to overfishing and predation by sea lampreys Petromyzon marinus. A binational effort to restore the lean morphotype of lake trout began with the stocking of hatchery-reared fish followed by the chemical control of sea lampreys and closure of...
Effects of two classification strategies on a Benthic Community Index for streams in the Northern Lakes and Forests Ecoregion
Jason T. Butcher, Paul M. Stewart, Thomas P. Simon
2003, Ecological Indicators (3) 195-202
Ninety-four sites were used to analyze the effects of two different classification strategies on the Benthic Community Index (BCI). The first, a priori classification, reflected the wetland status of the streams; the second, a posteriori classification, used a bio-environmental analysis to select classification variables. Both classifications were examined by measuring...
Plant abundance: the measurement and relationship with seed size
Q. Guo
2003, Oikos (101) 639-642
There are many inconsistencies in early reports describing the relationships between plant abundance and other biotic (e.g., seed size) or abiotic variables (e.g., precipitation). It has been difficult to generalize such relationships when abundance is measured differently (e.g., density, biomass, cover). This article suggests using abundance in two broad categories:...
Genetic variation over space and time: Analyses of extinct and remnant lake trout populations in the Upper Great Lakes
B. Guinand, K.T. Scribner, K.S. Page, M. K. Burnham-Curtis
2003, Proceedings of the Royal Society B: Biological Sciences (270) 425-433
Lake trout (Salvelinus namaycush) in the upper Laurentian Great Lakes of North America experienced striking reductions in abundance and distribution during the mid–twentieth century. Complete collapse of populations was documented for Lake Michigan, and a few remnant populations remained only in lakes Huron and Superior. Using DNA obtained from historical...
Recommendations for assessing sea lamprey damages: toward optimizing the control program in the Great Lakes
Thomas J. Stewart, James R. Bence, Roger A. Bergstedt, Mark P. Ebener, Frank Lupi, Michael A. Rutter
2003, Journal of Great Lakes Research (29) 783-793
The Great Lakes sea lamprey (Petromyzon marinus) control program currently allocates stream treatments to optimize the number of juvenile sea lampreys killed for a given level of control. Although the economic benefits derived from control appear to outweigh the dollars spent on control efforts, optimizing the number of sea lampreys...
A Benthic Community Index for streams in the Northern Lakes and Forests Ecoregion
Jason T. Butcher, Paul M. Stewart, Thomas P. Simon
2003, Ecological Indicators (3) 181-193
Encompassing the northern glaciated section of the Midwest United States, the Northern Lakes and Forests Ecoregion is characterized by mixed conifer and deciduous forests and wetlands. Sites were randomly selected in the ecoregion using the Environmental Protection Agency's Environmental Monitoring and Assessment Program designed to develop an index of...
