A water-budget approach to restoring a sedge fen affected by diking and ditching
Douglas A. Wilcox, Michael J. Sweat, Martha L. Carlson, Kurt P. Kowalski
2006, Journal of Hydrology (320) 501-517
A vast, ground-water-supported sedge fen in the Upper Peninsula of Michigan, USA was ditched in the early 1900s in a failed attempt to promote agriculture. Dikes were later constructed to impound seasonal sheet surface flows for waterfowl management. The US Fish and Wildlife Service, which now manages the wetland as...
Recruitment of Hexagenia mayfly nymphs in western Lake Erie linked to environmental variability
Thomas B. Bridgeman, Don W. Schloesser, Ann E. Krause
2006, Ecological Applications (16) 601-611
After a 40-year absence caused by pollution and eutrophication, burrowing mayflies (Hexagenia spp.) recolonized western Lake Erie in the mid 1990s as water quality improved. Mayflies are an important food resource for the economically valuable yellow perch fishery and are considered to be major indicator species of the ecological condition...
Predicting crappie recruitment in Ohio reservoirs with spawning stock size, larval density, and chlorophyll concentrations
David B. Bunnell, R. Scott Hale, Michael J. Vanni, Roy A. Stein
2006, North American Journal of Fisheries Management (26) 1-12
Stock-recruit models typically use only spawning stock size as a predictor of recruitment to a fishery. In this paper, however, we used spawning stock size as well as larval density and key environmental variables to predict recruitment of white crappies Pomoxis annularis and black crappies P. nigromaculatus, a genus notorious...
Modeling wetland plant community response to assess water-level regulation scenarios in the Lake Ontario-St. Lawrence River basin
Christiane Hudon, Douglas Wilcox, Joel Ingram
2006, Environmental Monitoring and Assessment (113) 303-328
The International Joint Commission has recently completed a five-year study (2000-2005) to review the operation of structures controlling the flows and levels of the Lake Ontario - St. Lawrence River system. In addition to addressing the multitude of stakeholder interests, the regulation plan review also considers environmental sustainability and integrity...
Use of electric and bubble barriers to limit the movement of Eurasian ruffe (Gymnocephalus cernuus)
Heather A. Dawson, Ulrich G. Reinhardt, Jacqueline F. Savino
2006, Journal of Great Lakes Research (32) 40-49
Eurasian ruffe (Gymnocephalus cernuus) is an aquatic invasive species accidentally introduced via ballast water to the Great Lakes in the mid-1980s. Fish barrier technology is being studied to stop the spread of invasive fish species such as ruffe. Electrical barriers have been constructed, most notably in the Chicago Sanitary and...
Persistence of Pasteurella multocida in wetlands following avian cholera outbreaks
Julie A. Blanchong, M.D. Samuel, Diana R. Goldberg, D.J. Shadduck, M. A. Lehr
2006, Journal of Wildlife Diseases (42) 33-39
Avian cholera, caused by Pasteurella multocida, affects waterbirds across North America and occurs worldwide among various avian species. Once an epizootic begins, contamination of the wetland environment likely facilitates the transmission of P. multocida to susceptible birds. To evaluate the ability of P. multocida serotype-1, the most common serotype associated...
Forecasting effects of climate change on Great Lakes fisheries: models that link habitat supply to population dynamics can help
Michael L. Jones, Brian J. Shuter, Yingming Zhao, Jason D. Stockwell
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 457-468
Future changes to climate in the Great Lakes may have important consequences for fisheries. Evidence suggests that Great Lakes air and water temperatures have risen and the duration of ice cover has lessened during the past century. Global circulation models (GCMs) suggest future warming and increases in precipitation in the...
Multi-species patterns of avian cholera mortality in Nebraska's rainwater basin
Julie A. Blanchong, M.D. Samuel, G. Mack
2006, Journal of Wildlife Diseases (42) 81-91
Nebraska's Rainwater Basin (RWB) is a key spring migration area for millions of waterfowl and other avian species. Avian cholera has been endemic in the RWB since the 1970s and in some years tens of thousands of waterfowl have died from the disease. We evaluated patterns of avian cholera mortality...
Wetland environmental conditions associated with the risk of avian cholera outbreaks and the abundance of Pasteurella multocida
Julie A. Blanchong, Michael D. Samuel, Diana R. Goldberg, Daniel J. Shadduck, L. H. Creekmore
2006, Journal of Wildlife Management (70) 54-60
Avian cholera is a significant infectious disease affecting waterfowl across North America and occurs worldwide among various avian species. Despite the importance of this disease, little is known about the factors that cause avian cholera outbreaks and what management strategies might be used to reduce disease mortality. Previous studies indicated...
Parasitism and body condition in humpback chub from the Colorado and Little Colorado Rivers, Grand Canyon, Arizona
Timothy L. Hoffnagle, Anindo Choudhury, Rebecca A. Cole
2006, Journal of Aquatic Animal Health (18) 184-193
<span data-sheets-value="{"1":2,"2":"Glen Canyon Dam has greatly altered the Colorado River in Grand Canyon. The Little Colorado River (LCR) provides a small refuge of seasonally warm and turbid water that is thought to be more suitable than the Colorado River for endangered humpback chub Gila cypha. However, the LCR has low...
Experimental infection of the endangered bonytail chub (Gila elegans) with the Asian fish tapeworm (Bothriocephalus acheilognathi): impacts on survival, growth, and condition
S. P. Hansen, A. Choudhury, D.M. Heisey, J.A. Ahumada, T.L. Hoffnagle, Rebecca A. Cole
2006, Canadian Journal of Zoology (84) 1383-1394
Bothriocephalus acheilognathi Yamaguti, 1934, a tapeworm known to be pathogenic to some fish species, has become established in the endangered humpback chub (Gila cypha Miller, 1964) in Grand Canyon, USA, following the tapeworm’s introduction into the Colorado River system. The potential impact of this tapeworm on humpback chub was studied...
The effect of multiple stressors on salt marsh end-of-season biomass
J.M. Visser, C.E. Sasser, B.S. Cade
2006, Estuaries and Coasts (29) 331-342
It is becoming more apparent that commonly used statistical methods (e.g. analysis of variance and regression) are not the best methods for estimating limiting relationships or stressor effects. A major challenge of estimating the effects associated with a measured subset of limiting factors is to account for the effects of...
Autumn migration and selection of rock crevices as hibernacula by big brown bats in Colorado
D.J. Neubaum, T. J. O'Shea, K.R. Wilson
2006, Journal of Mammalogy (87) 470-479
Movements, distribution, and roosting requirements of most species of temperate-zone bats in autumn are poorly understood. We conducted the 1st radiotelemetry study of autumn migrations and prehibernation roost selection of bats in western North America. Big brown bats (Eptesicus fuscus, n = 55) in the Poudre River watershed, Colorado, moved...
Grain size-sensitive creep in ice II
T. Kubo, W.B. Durham, L.A. Stern, S. H. Kirby
2006, Science (311) 1267-1269
Rheological experiments on fine-grained water ice II at low strain rates reveal a creep mechanism that dominates at conditions of low stress. Using cryogenic scanning electron microscopy, we observed that a change in stress exponent from 5 to 2.5 correlates strongly with a decrease in grain size from about 40...
Lake sturgeon population characteristics in Rainy Lake, Minnesota and Ontario
W.E. Adams Jr., L.W. Kallemeyn, D.W. Willis
2006, Journal of Applied Ichthyology (22) 97-102
Rainy Lake contains a native population of lake sturgeon Acipenser fulvescens that has been largely unstudied. The aims of this study were to document the population characteristics of lake sturgeon in Rainy Lake and to relate environmental factors to year-class strength for this population. Gill-netting efforts throughout the study resulted...
The allometric relationship between resting metabolic rate and body mass in wild waterfowl (Anatidae) and an application to estimation of winter habitat requirements
M. R. Miller, J. McA Eadie
2006, Condor (108) 166-177
Breeding densities and migration periods of Common Snipe in Colorado were investigated in 1974-75. Sites studied were near Fort Collins and in North Park, both in north central Colorado; in the Yampa Valley in northwestern Colorado; and in the San Luis Valley in south central Colorado....Estimated densities of breeding snipe...
Assessment of reproductive effects in largemouth bass (Micropterus salmoides) exposed to bleached/unbleached kraft mill effluents
M. S. Sepulveda, D. S. Ruessler, N. D. Denslow, S. E. Holm, T. R. Schoeb, T. S. Gross
2006, Archives of Environmental Contamination and Toxicology (41) 475-482
This study evaluated the potential effects of different concentrations of bleached/unbleached kraft mill effluent (B/UKME) on several reproductive endpoints in adult largemouth bass (Micropterus salmoides). The kraft mill studied produces a 50/50 mix of bleached/unbleached market pulp with an estimated release of 36 million gal of effluent/day. Bleaching sequences were...
Making connections for bird conservation: linking states, provinces & territories to important wintering and breeding grounds
P.J. Blancher, B. Jacobs, A. Couturier, C.J. Beardmore, R. Dettmers, Erica H. Dunn, W. Easton, Eduardo E. Inigo-Elias, T.D. Rich, K.V. Rosenberg, J. M. Ruth
2006, Partners in Flight Technical Series 4
To effectively conserve migratory landbirds, we need to be involved in conservation beyond our political borders. This has been a central tenet of Partners in Flight (PIF) since the initiative began in 1990 with a focus on Nearctic-Neotropical migrants. Implementation of this concept has also been fundamental to the...
The influence of disturbance events on survival and dispersal rates of Florida box turtles
C.K. Dodd Jr., A. Ozgul, M.K. Oli
2006, Ecological Applications (16) 1936-1944
Disturbances have the potential to cause long-term effects to ecosystem structure and function, and they may affect individual species in different ways. Long-lived vertebrates such as turtles may be at risk from such events, inasmuch as their life histories preclude rapid recovery should extensive mortality occur. We applied capture–mark–recapture models...
Evaluating plant invasions from both habitat and species perspectives
G.W. Chong, Yuka Otsuki, T.J. Stohlgren, D. Guenther, P. Evangelista, C. Villa, M.A. Waters
2006, Western North American Naturalist (66) 92-105
We present an approach to quantitatively assess nonnative plant invasions at landscape scales from both habitat and species perspectives. Our case study included 34 nonnative species found in 142 plots (0.1 ha) in 14 vegetation types within the Grand Staircase–Escalante National Monument, Utah. A plot invasion index, based on nonnative...
Distribution of boreal toad populations in relation to estimated UV-B dose in Glacier National Park, Montana, USA
B. R. Hossack, S. A. Diamond, P.S. Corn
2006, Canadian Journal of Zoology (84) 98-107
A recent increase in ultraviolet B radiation is one hypothesis advanced to explain suspected or documented declines of the boreal toad (Bufo boreas Baird and Girard, 1852) across much of the western USA, where some experiments have shown ambient UV-B can reduce embryo survival. We examined B. boreas occupancy relative...
Divergent patterns of abundance and age-class structure of headwater stream tadpoles in burned and unburned watersheds
B. R. Hossack, P.S. Corn, D.B. Fagre
2006, Canadian Journal of Zoology (84) 1482-1888
Wildfire is a potential threat to many species with narrow environmental tolerances like the Rocky Mountain tailed frog (Ascaphus montanus Mittleman and Myers, 1949), which inhabits a region where the frequency and intensity of wildfires are expected to increase. We compared pre- and post-fire counts of tadpoles in eight streams...
Water-clover ferns, Marsilea, in the Southeastern United States
Colette C. Jacono, David M. Johnson
2006, Castanea (71) 1-14
A surge in the collection of exotic Marsilea, M. mutica, M. minuta and M. hirsuta in the southeastern United States has prompted the need for updated identification aids. This study provides an annotated key to all water-clover ferns occurring in the region. It describes and illustrates recently documented exotic species and a previously misidentified western introduction....
Response of fishes to floodplain connectivity during and following a 500-year flood event in the unimpounded upper Mississippi River
V.A. Barko, D.P. Herzog, M. T. O’Connell
2006, Wetlands (26) 244-257
We examined data collected on fish assemblage structure among three differing floodplain types (broad, moderate, and narrow) during the 1993 flood in the unimpounded reach of the upper Mississippi River. This 500 year flood event provided a unique opportunity to investigate fish-floodplain function because the main river channel is otherwise...
Polychlorinated biphenyl congener patterns in tree swallows (Tachycineta bicolor) nesting in the Housatonic River watershed, western Massachusetts, USA, using a novel statistical approach
Christine M. Custer, L.B. Read
2006, Environmental Pollution (142) 235-245
A novel application of a commonly used statistical approach was used to examine differences in polychlorinated biphenyl (PCB) congener Patterns among locations and sample matrices in tree swallows (Tachycineta bicolor) nesting in the Housatonic River watershed in western Massachusetts. USA. The most prevalent PCB congeners in tree swallow tissue samples...
