Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41556
Mycotoxins: diffuse and point source contributions of natural contaminants of emerging concern to streams
To determine the prevalence of mycotoxins in streams, 116 water samples from 32 streams and three wastewater treatment plant effluents were collected in 2010 providing the broadest investigation on the spatial and temporal occurrence of mycotoxins in streams conducted in the United States to date. Out of the 33 target mycotoxins measured, nine were detected at least once during this study. The det
Authors
Dana W. Kolpin, Judith Schenzel, Michael T. Meyer, Patrick J. Phillips, Laura E. Hubbard, Tia-Marie Scott, Thomas D. Bucheli
First evidence of grass carp recruitment in the Great Lakes Basin
We use aging techniques, ploidy analysis, and otolith microchemistry to assess whether four grass carp Ctenopharyngodon idella captured from the Sandusky River, Ohio were the result of natural reproduction within the Lake Erie Basin. All four fish were of age 1 +. Multiple lines of evidence indicate that these fish were not aquaculture-reared and that they were most likely the result of successful
Authors
Duane Chapman, J. Jeremiah Davis, Jill A. Jenkins, Patrick M. Kocovsky, Jeffrey G. Miner, John Farver, P. Ryan Jackson
Effects of a non-native cichlid fish (African jewelfish, Hemichromis letourneuxi Sauvage 1880) on a simulated Everglades aquatic community
In an 8-month mesocosm experiment, we examined how a simulated Everglades aquatic community of small native fishes, snails, and shrimp changed with the addition of either a native predator (dollar sunfish Lepomis marginatus) or a non-native predator (African jewelfish Hemichromis letourneuxi) compared to a no-predator control. Two snail species (Planorbella duryi, Physella cubensis) and the shrimp
Authors
Pamela J. Schofield, Daniel H. Slone, Denise R. Gregoire, William F. Loftus
Nearshore temperature findings for the Colorado River in Grand Canyon, Arizona: possible implications for native fish
Since the completion of Glen Canyon Dam, Arizona, in 1963, downstream water temperatures in the main channel of the Colorado River in Glen, Marble, and Grand Canyons are much colder in summer. This has negatively affected humpback chub (Gila cypha) and other native fish adapted to seasonally warm water, reducing main-channel spawning activity and impeding the growth and development of larval and j
Authors
Robert P. Ross, William S. Vernieu
USGS National Wildlife Health Center quarterly mortality report
No abstract available.
Authors
Anne E. Ballmann, C. LeAnn White, Barbara L. Bodenstein, Jennifer L. Buckner
An integrated model of environmental effects on growth, carbohydrate balance, and mortality of Pinus ponderosa forests in the southern Rocky Mountains
Climate-induced tree mortality is an increasing concern for forest managers around the world. We used a coupled hydrologic and ecosystem carbon cycling model to assess temperature and precipitation impacts on productivity and survival of ponderosa pine (Pinus ponderosa). Model predictions were evaluated using observations of productivity and survival for three ponderosa pine stands located across
Authors
Christina L. Tague, Nathan G. McDowell, Craig D. Allen
Regulation of a putative corticosteroid, 17, 21-dihydroxypregn-4-ene, 3, 20-one, in sea lamprey, Petromyzon marinus
In higher vertebrates, in response to stress, the hypothalamus produces corticotropin-releasing hormone (CRH), which stimulates cells in the anterior pituitary to produce adrenocorticotropic hormone (ACTH), which in turn stimulates production of either cortisol (F) or corticosterone (B) by the adrenal tissues. In lampreys, however, neither of these steroids is present. Instead, it has been propose
Authors
Brent W. Roberts, Wes Didier, Satbir Rai, Nicholas S. Johnson, Scot V. Libants, Sang-Seon Yun, David Close
Broad-scale patterns of Brook Trout responses to introduced Brown Trout in New York
Brook Trout Salvelinus fontinalis and Brown Trout Salmo trutta are valuable sport fish that coexist in many parts of the world due to stocking introductions. Causes for the decline of Brook Trout within their native range are not clear but include competition with Brown Trout, habitat alteration, and repetitive stocking practices. New York State contains a large portion of the Brook Trout's native
Authors
James E. McKenna, Michael T. Slattery, Kean M. Clifford
Habitat heterogeneity and intraguild interactions modify distribution and injury rates in two coexisting genera of damselflies
1. Sublethal effects of predation can affect both population and community structure. Despite this, little is known about how the frequency of injury varies in relation to habitat, aquatic community characteristics or between trophically similar, coexisting taxa.
2. In a tidal freshwater ecosystem, we first examined injuries (lamellar autotomy) of Enallagma and Ischnura damselfly larvae, which h
Authors
Jonathan W. Witt, Rebecca E. Forkner, Richard T. Kraus
Water quality, sediment characteristics, aquatic habitat, geomorphology, and mussel population status of the Clinch River, Virginia and Tennessee, 2009-2011
Chemical, physical, and biological data were collected during 2009-2011 as part of a study of the Clinch River in Virginia and Tennessee. The data from this study, data-collection methods, and laboratory analytical methods used in the study are documented in this report. The study was conducted to describe the conditions of the Clinch River and to determine if there are measurable differences in c
Authors
Jennifer L. Krstolic, Gregory C. Johnson, Brett J.K. Ostby
Potential for parasite-induced biases in aquatic invertebrate population studies
Recent studies highlight the need to include estimates of detection/capture probability in population studies. This need is particularly important in studies where detection and/or capture probability is influenced by parasite-induced behavioral alterations. We assessed potential biases associated with sampling a population of the amphipod Gammarus lacustris in the presence of Polymorphus spp. aca
Authors
Justin D.L. Fisher, David M. Mushet, Craig A. Stockwell
Climate change and fire effects on a prairie-woodland ecotone: projecting species range shifts with a dynamic global vegetation model
Large shifts in species ranges have been predicted under future climate scenarios based primarily on niche-based species distribution models. However, the mechanisms that would cause such shifts are uncertain. Natural and anthropogenic fires have shaped the distributions of many plant species, but their effects have seldom been included in future projections of species ranges. Here, we examine how
Authors
David A. King, Dominique M. Bachelet, Amy J. Symstad